Engineering › Biomedical Engineering

Mechanics and Biomechanics Studies

Works Count: 29130

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This cluster of papers focuses on the biomechanical analysis of archery techniques, equipment, and historical perspectives. It covers topics such as muscular activation patterns, kinematics of archery shooting, performance assessment, arrow behavior, machine engineering, and historical developments in mechanism design.

Keywords

Archery; Biomechanics; Muscular Activation; Kinematics; Performance Assessment; EMG; Arrow Behavior; Machine Engineering; Historical Perspective; Mechanism Design

Elastic mechanisms in animal movement

1989-05-01

R. McNeill. Alexander

Preface 1. Elastic materials 2. Springs as muscle antagonists 3. Springs as energy stores: running 4. Springs as energy stores: swimming and flight 5. Fibre-wound animals 6. Springs as catapults … Preface 1. Elastic materials 2. Springs as muscle antagonists 3. Springs as energy stores: running 4. Springs as energy stores: swimming and flight 5. Fibre-wound animals 6. Springs as catapults 7. Suspension springs and shock absorbers 8. Springs and control 9. Springs and size References Index.

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Biomechanics of the musculo-skeletal system

1995-07-01

Benno Maurus Nigg , Walter Herzog

BIOMATERIALS: Bone Articular Cartilage Ligament Tendon Muscle Joints MEASURING TECHNIQUES: Force Acceleration Optical Methods Strain Measurement EMG Inertial Properties of the Human or Animal Body MODELLING: General Comments About Modelling … BIOMATERIALS: Bone Articular Cartilage Ligament Tendon Muscle Joints MEASURING TECHNIQUES: Force Acceleration Optical Methods Strain Measurement EMG Inertial Properties of the Human or Animal Body MODELLING: General Comments About Modelling The Free Body Diagram Mathematically Determinate Systems Mathematically Indeterminate Systems General Considerations on Determinate and Indeterminate Systems Energy Considerations Simulation.

Biomechanics and motor control of human movement

1990-12-01

David A. Winter

Preface to the Fourth Edition. 1 Biomechanics as an Interdiscipline. 1.0 Introduction. 1.1 Measurement, Description, Analysis, and Assessment. 1.2 Biomechanics and its Relationship with Physiology and Anatomy. 1.3 Scope of … Preface to the Fourth Edition. 1 Biomechanics as an Interdiscipline. 1.0 Introduction. 1.1 Measurement, Description, Analysis, and Assessment. 1.2 Biomechanics and its Relationship with Physiology and Anatomy. 1.3 Scope of the Textbook. 1.4 References. 2 Signal Processing. 2.0 Introduction. 2.1 Auto- and Cross-Correlation Analyses. 2.2 Frequency Analysis. 2.3 Ensemble Averaging of Repetitive Waveforms. 2.4 References. 3 Kinematics. 3.0 Historical Development and Complexity of Problem. 3.1 Kinematic Conventions. 3.2 Direct Measurement Techniques. 3.3 Imaging Measurement Techniques. 3.4 Processing of Raw Kinematic Data. 3.5 Calculation of Other Kinematic Variables. 3.6 Problems Based on Kinematic Data. 3.7 References. 4 Anthropometry. 4.0 Scope of Anthropometry in Movement Biomechanics. 4.1 Density, Mass, and Inertial Properties. 4.2 Direct Experimental Measures. 4.3 Muscle Anthropometry. 4.4 Problems Based on Anthropometric Data. 4.5 References. 5 Kinetics: Forces and Moments of Force. 5.0 Biomechanical Models. 5.1 Basic Link-Segment Equations-the Free-Body Diagram. 5.2 Force Transducers and Force Plates. 5.3 Bone-on-Bone Forces During Dynamic Conditions. 5.4 Problems Based on Kinetic and Kinematic Data. 5.5 References. 6 Mechanical Work, Energy, and Power. 6.0 Introduction. 6.1 Efficiency. 6.2 Forms of Energy Storage. 6.3 Calculation of Internal and External Work. 6.4 Power Balances at Joints and Within Segments. 6.5 Problems Based on Kinetic and Kinematic Data. 6.6 References. 7 Three-Dimensional Kinematics and Kinetics. 7.0 Introduction. 7.1 Axes Systems. 7.2 Marker and Anatomical Axes Systems. 7.3 Determination of Segment Angular Velocities and Accelerations. 7.4 Kinetic Analysis of Reaction Forces and Moments. 7.5 Suggested Further Reading. 7.6 References. 8 Synthesis of Human Movement-Forward Solutions. 8.0 Introduction. 8.1 Review of Forward Solution Models. 8.2 Mathematical Formulation. 8.3 System Energy. 8.4 External Forces and Torques. 8.5 Designation of Joints. 8.6 Illustrative Example. 8.7 Conclusions. 8.8 References. 9 Muscle Mechanics. 9.0 Introduction. 9.1 Force-Length Characteristics of Muscles. 9.2 Force-Velocity Characteristics. 9.3 Muscle Modeling. 9.4 References. 10 Kinesiological Electromyography. 10.0 Introduction. 10.1 Electrophysiology of Muscle Contraction. 10.2 Recording of the Electromyogram. 10.3 Processing of the Electromyogram,. 10.4 Relationship between Electromyogram and Biomechanical Variables. 10.5 References. 11 Biomechanical Movement Synergies. 11.0 Introduction. 11.1 The Support Moment Synergy. 11.2 Medial/Lateral and Anterior/Posterior Balance in Standing. 11.3 Dynamic Balance during Walking. 11.4 References. APPENDICES. A. Kinematic, Kinetic, and Energy Data. Figure A.1 Walking Trial-Marker Locations and Mass and Frame Rate Information. Table A.1 Raw Coordinate Data (cm). Table A.2( a ) Filtered Marker Kinematics-Rib Cage and Greater Trochanter (Hip). Table A.2( b ) Filtered Marker Kinematics-Femoral Lateral Epicondyle (Knee) and Head of Fibula. Table A.2( c ) Filtered Marker Kinematics-Lateral Malleolus (Ankle) and Heel. Table A.2( d ) Filtered Marker Kinematics-Fifth Metatarsal and Toe. Table A.3( a ) Linear and Angular Kinematics-Foot. Table A.3( b ) Linear and Angular Kinematics-Leg. Table A.3( c ) Linear and Angular Kinematics-Thigh. Table A.3( d ) Linear and Angular Kinematics-1/2 HAT. Table A.4 Relative Joint Angular Kinematics-Ankle, Knee, and Hip. Table A.5( a ) Reaction Forces and Moments of Force-Ankle and Knee. Table A.5( b ) Reaction Forces and Moments of Force-Hip. Table A.6 Segment Potential, Kinetic, and Total Energies-Foot, Leg, Thigh, and1/2 HAT. Table A.7 Power Generation/Absorption and Transfer-Ankle, Knee, and Hip. B. Units and Definitions Related to Biomechanical and Electromyographical Measurements. Table B.1 Base SI Units. Table B.2 Derived SI Units. Index.

History of strength of materials : with a brief account of the history of theory of elasticity and theory of structures

1983-01-01

S. Timoshenko

Analytical Methods in Rotor Dynamics

2013-01-01

Andrew D. Dimarogonas , Stefanos A. Paipetis , Thomas G. Chondros

Muscle sound: bases for the introduction of a mechanomyographic signal in muscle studies.

1993-01-01

Claudio Orizio

Muscular sound is a mechanical phenomenon detectable at the surface of an active muscle, which has been known and described since 1800. Only recently, because of the availability of reliable … Muscular sound is a mechanical phenomenon detectable at the surface of an active muscle, which has been known and described since 1800. Only recently, because of the availability of reliable transducers and sophisticated analysis techniques, has this signal become attractive for monitoring the mechanical aspects of muscle contraction. The muscular sound characteristics were investigated both during electrically elicited and voluntary contractions. In the first case, the influence of the biophysical and mechanical properties of the muscle on this signal was studied. During voluntary efforts the summation of the mechanical activity of the recruited motor units was analyzed. The results indicate that the muscular sound may be an adjunct tool to the force, the physiological force tremor, and electromyogram to obtain information on the muscle mechanical model as well as on muscle motor control. This review focuses on the following aspects of the signal: (1) recording problems; (2) muscle sound properties during stimulation of isolated and in vivo muscle; (3) time and frequency domain analysis during non fatiguing and fatiguing contractions; (4) comparison with other signals related to muscle activity; (5) discussion on the origin; and (6) possible practical applications.

Muscle and tendon contributions to force, work, and elastic energy savings: a comparative perspective.

2000-07-01

A. Biewener , Thomas J. Roberts

Muscle-tendon architecture underlies muscle function. Whereas muscles generally contribute most to mechanical work, tendons provide the majority of elastic energy savings. Isometric or eccentric contractions enhance force and further reduce … Muscle-tendon architecture underlies muscle function. Whereas muscles generally contribute most to mechanical work, tendons provide the majority of elastic energy savings. Isometric or eccentric contractions enhance force and further reduce energy cost. However, elastic savings is probably constrained by the need to reduce compliance for accurate control of position.

Proprioceptive Illusions Induced by Muscle Vibration: Contribution by Muscle Spindles to Perception?

1972-03-24

Guy M. Goodwin , D.I. McCloskey , Peter B. C. Matthews

When vibration of 100 hertz was applied to the tendon of the biceps or the triceps muscle, the subject made a systematic misjudgment of the angle at the elbow. During … When vibration of 100 hertz was applied to the tendon of the biceps or the triceps muscle, the subject made a systematic misjudgment of the angle at the elbow. During contraction the error could be as much as 40 degrees. The subject thought that the elbow was in the position that it would have assumed if the vibrated muscle had been stretched.

A procedure for determining rigid body transformation parameters

1995-06-01

John H. Challis

What the Tortoise Said to Achilles

2018-04-19

Lewis Carroll

A Method of Analyzing Experimental Results Obtained from Elasto-Viscous Bodies

1936-08-01

Andrew Gemant

An attempt is made to develop a general method of analyzing experimental results concerned with the behavior of elasto-viscous bodies. It is shown that the transient equation for relaxation processes … An attempt is made to develop a general method of analyzing experimental results concerned with the behavior of elasto-viscous bodies. It is shown that the transient equation for relaxation processes can be deduced from the experimental impedance formula, and that relaxation experiments are in agreement with the deduced transient equation. A differential equation relating stress, strain and time is derived from the experimental impedance formula. The relation of this equation toithe well-known Maxwell equation is discussed.

Contribution to the Synthesis of Biped Gait

1969-01-01

Miomir Vukobratović , Davor Juričić

The connection between the dynamics of an object and the algorithmic level has been modified in this paper, based on two-level control. The central modification consists in introducing feedbacks, that … The connection between the dynamics of an object and the algorithmic level has been modified in this paper, based on two-level control. The central modification consists in introducing feedbacks, that is, a system of regulators at the level of the formed typed of gait only. Such a modification originates from the assumption that a very narrow class of gait types needs to be taken into account when generating the gait. In the paper the gait has been formed on the basis of a fixed program having a kinematic-dynamic character. The kinematic part concerns the kinematic programnmed connections for activating the lower extremities, while the dynamic part exposes appropriate changes in the characteristic coordinates of the compensation system. Such a connection with a minimum number of coordinates extends the possibility of solving the problem of equilibrium in motion for one type of gait without any particular algorithm that would take into account the motion coordinates and form out of them a stable motion at a higher algebraic level.

A Lecture on VASOVAGAL SYNCOPE AND THE CAROTID SINUS MECHANISM

1932-05-14

T. Lewis

fni the present article a form of fainting is described for which the term " vasovagal syncope " will be found most a.ppropriate.It forms a common and interesting disturbance of … fni the present article a form of fainting is described for which the term " vasovagal syncope " will be found most a.ppropriate.It forms a common and interesting disturbance of a transient kind.It will be described and discussed in relation to a mechanism that has been under close investigation in recent years.There is another and distinct condition with which terminology tends to con- fuse it-namely, what I shall call for convenience " Gowers's syndrome "; there is also a third condition, probably comprising a vasomotor disturbance-namely, " Nothnagel's syndrome," and thought by some to be identical with Gowers's syndrome.The available evidence relating to these last two maladies will be considered sufficiently to allow us to see what there is in it of significance from the standpoint of the vascular system.

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The gyroscopic mechanism of the halteres of Diptera

1948-11-02

John Pringle

The paper gives a detailed anatomical, dynamical and physiological analysis of the gyroscopic mechanism of the halteres of the higher Diptera. (1) A re-examination has been made of the structure … The paper gives a detailed anatomical, dynamical and physiological analysis of the gyroscopic mechanism of the halteres of the higher Diptera. (1) A re-examination has been made of the structure of the articular region of the halteres of Lucilia sericata, Calliphora erythrocephala and Eristalis tenax . In these higher Diptera the organ as a whole is free to move only in one plane, by oscillation through an angle of approximately 150° about a horizontal hinge. A secondary articulation distal to the main hinge allows a slight, damped movement about an axis at right angles to the hinge in the plane of oscillation. (2) The frequency of oscillation is determined by the mechanical resonance of the system. The single muscle produces, by its contraction, an upwards movement of the haltere and the downstroke results from the elasticity of the hinge. (3) Stroboscopic observation of the haltere in the living fly shows that the cycle of oscillation consists of two phases of nearly constant angular velocity with rapid reversals at the ends of the stroke. (4) Dynamical analysis of such a mechanical system shows that: ( a ) when the fly as a whole is not rotating, the secondary articulation ensures that the only forces acting on the basal region of the haltere are the ‘primary’ torques about the main hinge, ( b ) When the fly is rotating in any plane not that of the oscillation, gyroscopic torques are set up at the base of the haltere about an axis at right-angles to the haltere in the plane of oscillation, ( c ) The magnitude and periodicity of these torques are different for yawing rotations and for pitch or roll. (5) Since pitching and rolling rotations can be distinguished only by a phase comparison between the gyroscopic torques in the halteres of opposite sides, and since it can be shown experimentally that flight is unimpaired under conditions when the two halteres are oscillating at different frequencies, it is evidently only in the yawing plane that unique indications are given to the fly by the haltere sense organs. (6) A detailed re-examination of the structure of the sensilla groups on the haltere base in the light of recent advances in knowledge of the function of campaniform and chordotonal sensilla suggests a functional classification into three classes: (A) those sensitive to the vertical ‘primary’ forces (scapal plates, Hicks papillae and small chordotonal organ), (B) those sensitive to the lateral gyroscopic forces (basal plate, large chordotonal organ) and (C) those without selective sensitivity (undifferentiated papilla). (7) A method is described of obtaining oscillograph records of impulses in the haltere nerve while the haltere is being oscillated by the pull of its own muscle. (8) When there is no rotation of the body of the fly, the volleys of impulses recorded in the haltere nerve are of the type to be expected if the sensilla groups are being excited by the ‘primary’ forces. (9) When the body of the fly is rotated in yaw or roll the pattern of impulses in the haltere nerve changes in the manner which is to be expected if certain sensilla groups are being excited by the gyroscopic forces. (10) Detailed analysis of the waveform of the oscillograph records at the beginning and end of yawing and rolling rotations reveals differences between the two types of impulse pattern which are consistent with the dynamical analysis. (11) Flash photographs of a haltere-less fly in free flight confirm that such an insect is in that state of spiral instability which is to be expected if there is inadequate stabilization in the yawing plane. (12) A brief comparison of the distribution of sensilla on the bases of the halteres and wings, and a review of what is known of the nature and periodicity of the forces acting on the base of the wings during flight, suggest that it may be possible to trace the stages through which the gyroscopic mechanism of the haltere has evolved from the flight mechanism of the wing.

Analysis of Loads on the Lumbar Spine

1981-01-01

Albert B. Schultz , Gunnar Andersson

This paper presents procedures to calculate the loads on the lumbar spine and the contraction forces in the trunk muscles that are likely to be produced by given physical activities. This paper presents procedures to calculate the loads on the lumbar spine and the contraction forces in the trunk muscles that are likely to be produced by given physical activities.

On the coefficient of viscous traction and its relation to that of viscosity

1906-05-14

Frederick Thomas Trouton

When experiments are made on the viscous flow of pitch and other substances of similar character, in the form of rods or cylinders, by the torsional method, it is found … When experiments are made on the viscous flow of pitch and other substances of similar character, in the form of rods or cylinders, by the torsional method, it is found that the rate of turning under torsion of these rods is not strictly proportional to the driving couple. Thus the rate of flow of the material under shearing stress cannot be in simple proportion to stress. If it is wished to investigate the exact law connecting the rate of flow with the shearing forces, by means of the torsional method, a complication is at once met with, arising from the fact that the rate of flow in a twisting rod is not of the same value everywhere, but necessarily varies from nothing at the centre to a maximum at the surface of the rod. With the view of developing a more suitable way of investigating the phenomenon, trials were made with different methods of observing the flow of such bodies, under conditions in which the said objection does not apply. The results obtained in these ways exhibit the same departures from linearity as was suggested by the results obtained by the method of torsion.

Forward and backward axial synergies in man

1987-02-01

P. Crenna , C. Frigo , J Massion +1 more

Die Mechanik in ihrer Entwicklung : historisch-kritisch dargestellt

1889-01-01

Ernst Mach

Theory of black hole accretion disks

1998-01-01

J. E. Pringle , M. Abramowicz , G. Björnsson

Part I. Observations of Black Holes: 1. Black holes in our Galaxy: observations P. Charles 2. Black holes in Active Galactic Nuclei: observations G. M. Madejski Part II. Physics Close … Part I. Observations of Black Holes: 1. Black holes in our Galaxy: observations P. Charles 2. Black holes in Active Galactic Nuclei: observations G. M. Madejski Part II. Physics Close to a Black Hole: 3. Physics of black holes I. D. Novikov 4. Physics of black hole accretion M. A. Abramowicz Part III. Turbulence, Viscosity: 5. Disc turbulence and viscosity A. Brandenburg Part IV. Radiative Processes: 6. The role of electron-positron pairs in accretion flows G. Bjornsson 7. Accretion disc-corona models and X/Y-ray spectra of accreting black holes J. Poutanen 8. Emission lines: signatures of relativistic rotation A. C. Fabian Part V. Accretion Discs: 9. Spectral tests of models for accretion disks around black holes J. H. Krolik 10. Advection-dominated accretion around black holes R. Narayan, R. Mahadevan and E. Quataert 11. Accretion disc instabilities and advection dominated accretion flows J.-P. Lasota 12. Magnetic field and multi-phase gas in AGN A. Celotti and M. J. Rees Part V. Discs in Binary Black Holes: 13. Supermassive binary black holes in galaxies P. Artymowicz Part VI. Stability of Accretion Discs: 14. Large scale perturbation of an accretion disc by a black hole binary companion J. C. B. Papaloizou, C. Terquem and D. N. C. Lin 15. Stable oscillations of black hole accretion discs M. Nowak and D. Lehr Part VI. Coherant Structures: 16. Spotted discs A. Bracco, A. Provenzale, E. A. Spiegel and P. Yecko Self-organized critically in accretion discs P. Wiita and Y. Xiong Summary: old and new advances in black hole accretion disc theory R. Svensson.

Dynamic Analysis of Mechanical Systems With Clearances—Part 1: Formation of Dynamic Model

1971-02-01

Steven Dubowsky , F. Freudenstein

A mathematical model of an elastic mechanical joint with clearances has been formulated and the dynamical equations of motion derived (Part I). The model, which we have called an Impact … A mathematical model of an elastic mechanical joint with clearances has been formulated and the dynamical equations of motion derived (Part I). The model, which we have called an Impact Pair, is basic to the determination of the dynamical response of mechanical and electromechanical systems with clearances, including determination of dynamic force amplification, frequency response, time-displacement characteristics, and other dynamic characteristics. Whenever possible, the results for the impact pair under various operating conditions are illustrated by graphs, which may also offer some insight into the behavior of clearance-coupled systems.

Kinematics of the western Mediterranean

1989-01-01

John Dewey , Mark Helman , Steven D. Knott +2 more

Summary The kinematic understanding of the relationship between relative plate motion and the structure of orogenic belts depends upon a knowledge of relative plate motion across the plate boundary system, … Summary The kinematic understanding of the relationship between relative plate motion and the structure of orogenic belts depends upon a knowledge of relative plate motion across the plate boundary system, the relative motion of small blocks and flakes within the system, an evaluation of orogenic body forces, and an understanding of the thermomechanical evolution of the upper part of the orogenic lithosphere in determining strength and detachment levels. We have built a preliminary model for the Cenozoic kinematic evolution of the western Mediterranean oceanic basins and their peripheral orogens that integrates (1) the motion of Africa relative to Europe based upon a new study of Atlantic fracture zones using SEASAT data and the Lamont-Doherty magnetic anomaly database, (2) a new interpretation of the rotation of Corsica/Sardinia and the opening of the Balearic and Tyrrhenian oceanic basins, (3) sedimentary facies sequences in the Apennines, Calabria, and Sicily, and (4) Apennine/Calabrian structure and structural sequence.

A Markerless Motion Capture System to Study Musculoskeletal Biomechanics: Visual Hull and Simulated Annealing Approach

2006-05-04

Stefano Corazza , Lars Mündermann , Ajit M.W. Chaudhari +3 more

IV. On the theory of lubrication and its application to Mr. Beauchamp tower’s experiments, including an experimental determination of the viscosity of olive oil

1886-12-31

1. Lubrication, or the action of oils and other viscous fluids to diminish friction and wear between solid surfaces, does not appear to have hitherto formed a subject for theoretical … 1. Lubrication, or the action of oils and other viscous fluids to diminish friction and wear between solid surfaces, does not appear to have hitherto formed a subject for theoretical treatment. Such treatment may have been prevented by the obscurity of the physical actions involved, which belong to a class as yet but little known, namely, the boundary or surface actions of fluids; but the absence of such treatment has also been owing to the want of any general laws discovered by experiment. The subject is of such fundamental importance in practical mechanics, and the opportunities for observation are so frequent, that it may well be a matter of surprise that any general laws should have for so long escaped detection.

Inertia and muscle contraction parameters for musculoskeletal modelling of the shoulder mechanism

1991-01-01

H.E.J. Veeger , F.C.T. van der Helm , L.H.V. van der Woude +2 more

EXERCITATIO ANATOMICA DE MOTU CORDIS ET SANGUINIS IN ANIMALIBUS

1929-04-01

William Harvey , CHAUNCEY D. LEAKE

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THE PREHENSILE MOVEMENTS OF THE HUMAN HAND

1956-11-01

J. R. Napier

1. The prehensile movements of the hand as a whole are analysed from both an anatomical anda functional viewpoint. 2. It is shown that movements of the hand consist of … 1. The prehensile movements of the hand as a whole are analysed from both an anatomical anda functional viewpoint. 2. It is shown that movements of the hand consist of two basic patterns of movements which are termed precision grip and power grip. 3. In precision grip the object is pinched between the flexor aspects of the fingers and that of the opposing thumb. 4. In power grip the object is held as in a clamp between the flexed fingers and the palm, counter pressure being applied by the thumb lying more or less in the plane of the palm. 5. These two patterns appear to cover the whole range of prehensile activity of the human hand.

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BIOMECHANICS, Its Foundations and Objectives

1973-03-01

Ali Erkan Engin

Zur Operatorenmethode In Der Klassischen Mechanik

1932-07-01

J. v. Neumann

The Science of Mechanics in the Middle Ages

1960-01-01

A. Rupert Hall , Marshall Clagett

Motions of the Running Cheetah and Horse

1959-11-01

Milton Hildebrand

The American society of mechanical engineers

1902-09-01

Systema reptilium. Fasciculus primus, Amblyglossae

1843-01-01

Leopold Joseph Fitzinger

inter ilei petologiae cultores ivulo;ita.Xec socordia In his culpanda est, (quanjvls et Iiaec In meae •rtunae liomlne, qui oilicio publico, a Ilterarum riiltura plaiie alieno inter ilei petologiae cultores ivulo;ita.Xec socordia In his culpanda est, (quanjvls et Iiaec In meae •rtunae liomlne, qui oilicio publico, a Ilterarum riiltura plaiie alieno

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Biomechanics of the Locomotor Apparatus

1980-01-01

Friedrich Pauwels

Pads and Claws in Arboreal Locomotion

1974-01-01

Matt Cartmill

Session-RPE Method for Training Load Monitoring: Validity, Ecological Usefulness, and Influencing Factors

2017-11-02

Monoem Haddad , Georgios A. Stylianides , Léo Djaoui +2 more

Purpose: The aim of this review is to (1) retrieve all data validating the Session-rating of perceived exertion (RPE)-method using various criteria, (2) highlight the rationale of this method and … Purpose: The aim of this review is to (1) retrieve all data validating the Session-rating of perceived exertion (RPE)-method using various criteria, (2) highlight the rationale of this method and its ecological usefulness, and (3) describe factors that can alter RPE and users of this method should take into consideration. Method: Search engines such as SPORTDiscus, PubMed, and Google Scholar databases in the English language between 2001 and 2016 were consulted for the validity and usefulness of the session-RPE method. Studies were considered for further analysis when they used the session-RPE method proposed by Foster et al. in 2001. Participants were athletes of any gender, age, or level of competition. Studies using languages other than English were excluded in the analysis of the validity and reliability of the session-RPE method. Other studies were examined to explain the rationale of the session-RPE method and the origin of RPE. Results: A total of 950 studies cited the Foster et al. study that proposed the session RPE-method. 36 studies have examined the validity and reliability of this proposed method using the modified CR-10. Conclusion: These studies confirmed the validity and good reliability and internal consistency of session-RPE method in several sports and physical activities with men and women of different age categories (children, adolescents, and adults) among various expertise levels. This method could be used as "standing alone" method for training load (TL) monitoring purposes though some recommend to combine it with other physiological parameters as heart rate.

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I. On governors

1868-12-31

James Clerk Maxwell

A Governor is a part of a machine by means of which the velocity of the machine is kept nearly uniform, notwithstanding variations in the driving-power or the resistance. Most … A Governor is a part of a machine by means of which the velocity of the machine is kept nearly uniform, notwithstanding variations in the driving-power or the resistance. Most governors depend on the centrifugal force of a piece connected with a shaft of the machine. When the velocity increases, this force increases, and either increases the pressure of the piece against a surface or moves the piece, and so acts on a break or a valve.

Achilles in Vietnam: combat trauma and the undoing of character

1994-11-01

A Treatise on the Theory of Screws

1901-01-01

J. D. EVERETT

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Functional tuning of the nervous system with control of movement or maintenance of a steady posture. 1 . Mechanographic analysis of the work of the joint on execution of a postural task

1965-01-01

D. G. Asatryan

Shock and vibration handbook

1996-07-01

Essays in the History of Mechanics

1968-01-01

C. Truesdell

The Nature of the Mechanical Bond

2016-10-18

Carson J. Bruns , J. Fraser Stoddart

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Micrographia, or, Some physiological descriptions of minute bodies made by magnifying glasses : with observations and inquiries thereupon /

1665-01-01

Robert Hooke , James Allestry , John R. C. Martyn

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ASME International Mechanical Engineering Congress and Exposition

2001-06-01

First Page First Page

Biomechanical Analysis of Mongolian Bronze and Iron Age Four‐Legged Walking Petroglyphs

2025-06-23

Krisztián Bécs , Dénes Száz , Gábor Horváth | Natural Sciences

ABSTRACT Since the works of Eadweard Muybridge in the 1880s, the characteristics of motion of four‐legged animals are well known for experts of animal locomotion, and the different gaits of … ABSTRACT Since the works of Eadweard Muybridge in the 1880s, the characteristics of motion of four‐legged animals are well known for experts of animal locomotion, and the different gaits of many four‐legged species have been investigated in detail. The leg attitudes of four‐legged walking illustrations of natural history museums, animal anatomy text‐books and toy figurines have been studied from a biomechanical point of view. Many such illustrations have erroneous leg postures, not used by living four‐legged animals. The leg postures of walking four‐legged animals are also often erroneously illustrated in the fine arts. How correctly have people illustrated the walking of their four‐legged prey? Researchers analysed numerous prehistoric and modern artistic four‐legged walking depictions and concluded that prehistoric people were more aware of the motion of their four‐legged prey and depicted four‐legged walking more precisely than modern artists. In this work, we analyse 13 Mongolian four‐legged petroglyphs originating from the Bronze and Iron Ages. We asked whether they are erroneous or not in respect to their relative leg positions. We found that the 60.5% error rate of these Mongolian walking petroglyphs is smaller than the 73% error rate of mere chance but is larger than the 46% error rate of 39 other prehistoric walking depictions investigated earlier.

Effects of acceleration on interatomic interactions

2025-06-20

NULL AUTHOR_ID | Physical review. D/Physical review. D.

Long barrows in the European context

2025-06-19

| Oxbow Books

A Comparative Analysis of Traditional Chinese Archery and Modern Archery

2025-06-18

Ke Du | Frontiers in Humanities and Social Sciences

This article compares and analyzes Chinese traditional archery and modern archery from five dimensions: historical origin, technical characteristics, cultural connotations, educational functions, and modern transformation. Chinese traditional archery, with its … This article compares and analyzes Chinese traditional archery and modern archery from five dimensions: historical origin, technical characteristics, cultural connotations, educational functions, and modern transformation. Chinese traditional archery, with its profound cultural connotations, emphasizes "prioritizing moral integrity" and focuses on rituals and personal cultivation. In contrast, modern archery is oriented towards "prioritizing performance," emphasizing competitiveness and technical breakthroughs. The two differ in their educational functions, with traditional archery integrating moral education with skill development, while modern archery focuses on technical instruction. In terms of modern transformation, traditional archery revitalizes through innovative inheritance, and modern archery expands its influence through cultural integration. The future should promote deep integration of the two at the levels of "skill, art, and philosophy" to achieve complementarity and coexistence.

Digital Control of an Inverted Pendulum Using a Velocity-Controlled Robot

2025-06-17

Marco Costanzo , Raffaele Mazza , Ciro Natale | Machines

This research article tackles the control problem of an inverted pendulum, also known as the Furuta pendulum, mounted on a velocity-controlled robot manipulator in two configurations: the rotary pendulum and … This research article tackles the control problem of an inverted pendulum, also known as the Furuta pendulum, mounted on a velocity-controlled robot manipulator in two configurations: the rotary pendulum and the translational pendulum. Differently from most of the existing control architectures where the motor actuating the pendulum motion is torque-controlled, the proposed control architecture exploits the inner velocity loop usually available on industrial robots, thus easing the implementation of an inverted pendulum. Another aspect investigated in this paper and mostly overlooked in the literature is the digital implementation of the control and, specifically, the latency introduced by the digital controller. The proposed control solution explicitly models such effects in the control design phase, improving the closed-loop performance. The additional novelty introduced by this paper is the friction compensation that is essential in the swing-up phase of the inverted pendulum, whereas classical control strategies for the nonlinear swing-up usually neglect this effect, and their solutions lead to control failures in practical systems. This paper presents detailed modeling and experimental identification phases followed by the control design of both the nonlinear swing-up algorithm and the linear stabilization controller, both experimentally validated on a Meca500 robotic arm controlled via an EtherCAT communication protocol by a mini PC featuring a Xenomai real-time operating system. The overall system showcases the potential of high-performance digital control systems in industrial robotic applications.

Efforts to increase mental toughness through cognitive behaviour modification for paser club archery athletes

2025-06-16

Fitri Nur Shouma Ramadani , Rizma Fithri , Estri Kusumawati | Psikologia Jurnal Pemikiran dan Penelitian Psikologi

Sports competitions are one of the arenas in which a country can prove its capability to manage quality human resources. Good mental ability management is one factor that influences an … Sports competitions are one of the arenas in which a country can prove its capability to manage quality human resources. Good mental ability management is one factor that influences an athlete's success rate in winning a competition. Mental toughness positively influences an athlete, one of which is fostering motivation to achieve. This study aimed to determine the effect of CBM intervention on Paser club archery athletes in Sidoarjo in terms of increasing Mental toughness. This study uses a pretest-posttest design type with a single group and experimental research methodology. Because the sample is less than 30, the sampling technique used is non-probability sampling, namely saturation sampling. The mental toughness scale is used as a data collection tool and analyzed using a paired t-test. The statistical test results showed a significance value of .0001, which means that there is an effect of CBM intervention in increasing the mental toughness of Paser club archery athletes in Sidoarjo.

Assessment of Noise from Different Types of Rounds Fired from a Saluting Gun

2025-06-16

Gurmail S. Paddan , Matt J. Howell | Archives of Acoustics

The difference in sound pressure levels between two types of rounds fired from a saluting gun has been investigated; the rounds being identified as ‘current’ and ‘new’. A 3-pounder saluting … The difference in sound pressure levels between two types of rounds fired from a saluting gun has been investigated; the rounds being identified as ‘current’ and ‘new’. A 3-pounder saluting gun mounted on a concrete floor based at HMNB Portsmouth, UK, was used in the survey. Sound pressure levels were measured at the two people responsible for operating the gun: the firer and the loader. Twelve current rounds and 24 new rounds were fired during the survey. The new rounds showed a greater variation in peak sound pressure levels between rounds (interquartile range of 2.1 dB, firer’s location) compared with the current rounds (interquartile range of 1.1 dB, firer’s location). The highest C-weighted peak sound pressure levels for the firer were 173.1 dB for the current round compared with 166.8 dB for the new round. The corresponding highest C-weighted peak sound pressure levels for the loader were 170.6 dB and 163.0 dB, respectively. The difference between median peak sound pressure levels was 8.8 dB for the firer and 9.8 dB for the loader. Similar differences were measured in sound exposure levels between the two types of rounds. Frequency data presented can be used for assessing the suitability of appropriate hearing protectors. Mitigation measures are proposed for further reducing noise exposure of the operators.

CHAPTER 9 Copper- versus Stone-Tipped Dart Relative Functional Efficiency

2025-06-14

Jonathan Paige , Robert S. Walker , Briggs Buchanan +7 more | Berghahn Books

Mechanical response of avian skeletal muscle under quasi-static and dynamic uniaxial compression

2025-06-13

Thierry Dillard , P. P. Kelkar , N. Chari +3 more | Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials

The Hoofing Effect

2025-06-12

Rayd Majeed Al-Shammari | Research Square (Research Square)

<title>Abstract</title> Quantum gravity works through exchanging graviton particles, but these are limited to the speed of light, and since the universe is expanding non-locally faster than light, there is no … <title>Abstract</title> Quantum gravity works through exchanging graviton particles, but these are limited to the speed of light, and since the universe is expanding non-locally faster than light, there is no way to describe such phenomena unless we accept that spacetime is not emergent from quantum effects but a genuine continuous non-quantum entity that's only could be described through Einstein general relativity, then by taking into account a dual perspective of local and non-local perspective, I reached a proper mathematical description of the gravitational singularity without broken mathematics; these are the same results as Roger Penrose in his 1965 paper “Gravitational Collapse and Space-Time Singularities, but he reached it with conformal diagrams while I did it with Einstein field equations. We both define singularity to be equal to zero, I proved here that the least amount of energy concentration difference to curve spacetime is half Planck mass through this I proved that the curvature difference between spacetime intervals would act like a warp drive effect only if we have an accelerated quantum entangled system of collective masses larger than or equal to half Planck mass, We could use this effect to generate a controlled warp drive-like effect in particle accelerators that could reach a superluminal speeds with no need for exotic matter or negative energy, it's well-defined and justified both mathematically and experimentally in this paper, and as a falsifiability requirement to my work experimentally I put here the requirements for experiment to generate artificial gravitational singularity in particles accelerators that would reach a suitable temperature to sustain a stable nuclear fusion too.

Comparative Study Between The Heavy Duty Training Method And The Classical Training Method

2025-06-07

Narcis Julien Herlo , Claudiu Octavian Bulzan | Arena - Journal of Physical Activities.

Purpose: The study aims to compare the effectiveness of the Heavy Duty training method with the classical method in the development of muscle strength and hypertrophy, focusing on the biceps … Purpose: The study aims to compare the effectiveness of the Heavy Duty training method with the classical method in the development of muscle strength and hypertrophy, focusing on the biceps brachii and triceps surae muscle groups. Methods: The research was conducted over a period of 6 months at Panoramic Gym in Arad, involving a sample of 45 volunteers randomly divided into two groups: an experimental group (E.G.) and a control group (C.G.). The E.G. followed the Heavy Duty training method, while the C.G. followed the classical method. Strength tests (pull-ups and calf raises) and anthropometric measurements (arm and calf circumference) were used. Data were analyzed using arithmetic mean and standard deviation. Results: The E.G. recorded a 19.9% increase in pull-ups and 9.7% in calf raises, while the C.G. showed increases of 16.5% and 4.9%, respectively. Arm circumference increased by 3.3% in the E.G. and 2.7% in the C.G., and calf circumference by 1.9% vs. 1.5%. Conclusions: The Heavy Duty method generated superior progress in muscle strength and hypertrophy compared to the classical method, demonstrating greater efficiency in stimulating physiological adaptations through short and intense workouts, suitable for advanced athletes.

Claw hand as a result of Mannerist convention

2025-06-01

Philippe Charlier , Saudamini Deo | The Lancet

Copper- versus Stone-Tipped Dart Relative Functional Efficiency:

2025-06-01

Jonathan Paige , Robert S. Walker , Briggs Buchanan +1 more | Berghahn Books

تأثير التدريب العصبي الحركي (Neuro motor Training) بإستخدام نظارات التدريب متقطعة الضوء (Stroboscopic Glasses)على النشاط الكهربي للمخ وسرعة الاستجابة الحركية ودقة الطعن ومستوى أداء بعض المهارات الهجومية للاعبى المبارزة-

2025-06-01

حازم رضا عبده الزكى , عبد الرحمن هشام رزق | مجلة أسيوط لعلوم وفنون التربية الرياضية

Claw hand as a result of Mannerist convention

2025-06-01

Nicolas Kluger , Brian Hurwitz , Bertrand Lefrère | The Lancet

Needs Assessment for the Development of Archerymad Hat as an Alternative to Replace the Kisser Button in Archery

2025-05-31

Zaskya Riski Yanda , Razali Razali , Muhammad Iqbal +3 more | Path of Science

Sports play a crucial role in improving both the quality of life and athletic performance. One of the fastest-growing sports in Indonesia is archery, which not only enhances focus and … Sports play a crucial role in improving both the quality of life and athletic performance. One of the fastest-growing sports in Indonesia is archery, which not only enhances focus and concentration but also helps reduce stress. In archery, technical consistency is essential for achieving optimal results. One commonly used aid is the kisser button, but some athletes find it uncomfortable to use. Therefore, this study aims to conduct a needs assessment for the development of the Archery MAD Hat as an alternative tool for maintaining consistency in archery. The research follows the Borg and Gall development model with a waterfall approach, involving a literature review, field studies, product design, expert validation, and initial trials. The researchers collected data through questionnaires distributed to 15 respondents, including archery experts, coaches, and athletes. The needs assessment results indicate that wearing a hat during archery is already a common practice and provides functional benefits, particularly in reducing visual disturbances caused by light. The majority of respondents also expressed the need for an alternative aid to the kisser button that is more comfortable and can enhance shooting consistency. Based on the study findings, the development of the Archery MAD Hat has the potential to become an innovative solution for improving archery performance, especially for beginners. The product offers greater comfort than the kisser button and helps athletes maintain consistent posture and technique during shooting.

Brain activity and motor performance under different focus of attention in shooting of elite archer

2025-05-29

Kun Qin , Juan Wu , Shuo Wang | Journal of Human Sport and Exercise

The correlation between different focuses of attention (FOAs) and performance in archery had been insufficiently explored. This study aimed to investigate brain activity under different FOAs, quantify the relationship between … The correlation between different focuses of attention (FOAs) and performance in archery had been insufficiently explored. This study aimed to investigate brain activity under different FOAs, quantify the relationship between FOA and arrow scores in shooting. Sixteen elite archers were recruited to participate in this study. A 48-channel portable fNIRS device was used to collect hemodynamic signals in an outdoor environment. Each archer shot five arrows at a target placed 70 meters away. The results showed that motor performance at external and internal focus are not reach the statistical difference (t = 0.527, p = .606, Cohen’s d = 0.117). compared to IF, EF have lesser ΔHbO in channel 14 (t = -2.218, p = .044, Cohen’s d = 0.640), channel 30 (t = -2.306, p = .042, Cohen’s d = 0.598) and channel 42 (t = -3.506, p = .005, Cohen’s d = 1.012), but have greater ΔHbO in channel 37 (t = 2.638, p = .023, Cohen’s d = 0.762), channel 38 (t = 2.631, p = .023, Cohen’s d = 0.759). Additionally, compared to IF, EF have greater neural efficiency in channel 28 (p = .026). Compared to IF, EF enhanced activity in the visual cortex, particularly in V2 and V3, while decreasing activity in M1, S1, PMC, and SMA. Additionally, EF demonstrated greater neural efficiency in PMC and SMA. However, under IF, archers allocated additional resources to PMC and SMA to maintain performance levels comparable to those under EF.

Johann Jacobsson’s Preface to the Technological Dictionary, 1st Edition (1781)

2025-05-28

Jocelyn Holland | BRILL eBooks

Cage culture in North Eastern India: present status and future prospects

2025-05-27

M.S. Dorothy , S. Ganesh Sundara Raman , Bimal Kinkar Chand +3 more | Indian Journal of Animal Health

The mechanics of motility

2025-05-27

A Dynamic Programming Approach for the Brachistochrone Problem

2025-05-27

André Eduardo Alessi , Gabriel Vinicius Bacci , Hugo Gielamo Próspero +2 more

AbstractIn this paper, we address the brachistochrone problem using DynamicProgramming and an extension that accounts for forbiddenregions or obstacles. The brachistochrone problem seeks the curveof fastest descent under gravity between … AbstractIn this paper, we address the brachistochrone problem using DynamicProgramming and an extension that accounts for forbiddenregions or obstacles. The brachistochrone problem seeks the curveof fastest descent under gravity between two points, minimizingtravel time. While traditional approaches derive the cycloidal curveas the solution using calculus of variations, this work employs adiscrete, grid-based Dynamic Programming formulation to approximatethe optimal trajectory. Computational experiments showcasethe method’s flexibility, particularly in adapting to constraints suchas forbidden regions, and its ability to dynamically recalculate paths.Despite some limitations in angular resolution due to discretization,the proposed approach demonstrates robustness and scalability inaddressing constrained trajectory optimization problems. Moreover,this project lays the groundwork for extending the proposedmethodology to more complex scenarios, such as incorporating randomnessinto the trajectory, where the adaptability of this approachcan be effectively leveraged.

Technology of preparation of sleeve ends before pilgrims rolling

2025-05-27

V. D. Dobriak , Yu.D. , S.L. Stasevskyi +2 more | System technologies

The paper considers the issues of improvement of hot pilgrim rolling of pipes by means of preparation of front and rear ends of sleeves. The presence of a gap between … The paper considers the issues of improvement of hot pilgrim rolling of pipes by means of preparation of front and rear ends of sleeves. The presence of a gap between the sleeve and mandrel increases transverse variance and reduces pipe accuracy during pilgrim rolling. In the present article the issues of preparation of the front and rear ends of the sleeves to ensure the alignment of the sleeve and mandrel in the process of Pilgrim rolling are comprehensively considered. The preparation of the front ends of the sleeves is proposed to be carried out on a slant-rolling piercing mill by idle rollers of the swaging device located on the output side of the piercing mill. In the work a new technology of preparation of front ends of sleeves providing their reduction by idle rollers without compression along the thickness of the sleeve wall is proposed. The concept of a running-in device characterised by lower metal intensity and, accordingly, capital expenditures is proposed. By means of the sliding line method the forces acting on the idle rollers during reduction of the front ends of the sleeves are determined. The questions of preparation of back ends of sleeves before pilgrim rolling of pipes are considered. The back end of the sleeve after piercing has reduced outer and inner diameters, which makes it difficult to charge the mandrel into the sleeve, increasing the gap between them, which adversely affects the deformation of metal by rolls during pilgrim rolling, increasing the differentiality of pipes. To facilitate loading of the mandrel into the sleeve, the piercing technology is used with the mandrel moving in the direction opposite to the sleeve movement when the rear end of the workpiece approaches the rolls. As a result, it is possible to provide thinning of the sleeve wall in the direction towards its rear end with an increase in the internal diameter at the rear end, which facilitates the conditions of mandrel loading into the sleeve. Thinning of the wall of the rear end of the sleeve due to the convergence of the rolls of the piercing mill can reduce the volume and mass of the separated pilgrim head. To facilitate the loading of the mandrel into the sleeve with the prepared front end at the out-of-station charging section of the piercing mill, the calibration of the front end of the mandrel with a cylindrical shape is proposed, while ensuring the minimum tension between the front end of the sleeve and the mandrel for centring between them. The proposed technology of centring the rear end of the sleeve on the mandrel, which provides for the presence of a conical belt adjacent to the head of the mandrel. The parameters of the conical belt of the mandrel are determined taking into account the gap between the mandrel and the sleeve with its constant value along the length of the sleeve. Charging of the mandrel with a new calibration of the front end and a conical belt adjacent to the head with the help of a hydraulic cylinder of the priming press at the section of off-stage charging ensures centring of the front and rear ends of the sleeve on the mandrel.

Strategies to Deter Primary Cam Morphology in Youth Athletes: A Clinical Commentary and Call for Investigation

2025-05-26

Sara Lynn Terrell , Teresa L. Schuemann , J. M. Lynch

BACKGROUND: Primary prevention is a desirable path to decrease the incidence of primary cammorphology (PCM). This commentary provides specific attention to peak height velocity timing and training load management during … BACKGROUND: Primary prevention is a desirable path to decrease the incidence of primary cammorphology (PCM). This commentary provides specific attention to peak height velocity timing and training load management during critical growth periods in adolescent athletes. CLINICAL QUESTION: Can physical literacy and load management distribute epiphyseal loads and reduce the occurrence of PCM through periodized cycles of hip extension? KEY FINDINGS AND CLINICAL APPLICATION: We suggest this as a line of research that can be investigated by multiple independent researchers.

The "Universal Mechanic, Literary, Poetical and Prosaic Company Limited" de Rafael Zamora y Pérez de Urría

2025-05-20

Dolores Romero López

Este relato es un pequeño tesoro literario que captura la imaginación científica y mecanicista del siglo XIX explorando un dispositivo ficticio en aquella época y real en nuestros días: una … Este relato es un pequeño tesoro literario que captura la imaginación científica y mecanicista del siglo XIX explorando un dispositivo ficticio en aquella época y real en nuestros días: una máquina capaz de producir al por mayor y a bajo precio literatura de todas clases y abastecer el mundo entero con ficciones de todo tipo y género. Ideal para lectores que deseen profundizar en la creación literaria, esta pequeña narración ofrece tanto una reflexión sobre el progreso como una perspectiva satírica sobre la evolución del arte literario.

Modeling the impact of elastic bodies taking into account dry positional friction and the coefficient of velocity restoration

2025-05-20

Oleksiy Bohomolov , O. V. Zavhorodnii , Petro Gurskyi +6 more

Active drive towards elastic spinodals

2025-05-19

NULL AUTHOR_ID

Investigating the Influence of Effective Parameters on Tooth Geometry of Spherical Involute Bevel Gears Through Solving Napier’s Equations

2025-05-17

A. R. Salmanian Mobarakeh , Mehrdad Poursina , Mohsen Rezaei

A 12-week tailored sit-and-reach metrics intervention for archery athletes with flexibility deficits

2025-05-17

Hidayat Humaid , Ferry Yohannes Wattimena , Hernawan Hernawan +3 more

Background: Flexibility is a critical component of archery performance, where biomechanical demands such as postural stabilization and bow draw-release mechanics require optimal posterior chain mobility. This study aimed to evaluate … Background: Flexibility is a critical component of archery performance, where biomechanical demands such as postural stabilization and bow draw-release mechanics require optimal posterior chain mobility. This study aimed to evaluate a 12-week tailored flexibility program in improving posterior chain mobility in elite archers with flexibility deficits. Methods: This pretest-posttest pre-experimental study involved 30 elite archers (15 males, 15 females; ages 17–43 years) with baseline sit-and-reach deficits (≤25 cm). A 12-week intervention program combined dynamic-progressive stretching, myofascial release, and mobility training based on archery biomechanical profiles. Flexibility was measured using the sit-and-reach test at weeks 0 (pretest), 6 (midtest), and 12 (posttest). Statistical analyses included tests for normality of Shapiro-Wilk, homogeneity of Levene's test, repeated measures ANOVA, and Bonferroni’s post-hoc. Results: There was a significant increase in sit-and-reach scores from pretest (13.2 ± 4.1 cm) to midtest (18.9 ± 4.7 cm; p< 0.001; d = 1.32) and posttest (22.6 ± 5.3 cm; p< 0.001; d= 2.01), with a large effect size (η² = 0.632). Homogeneous responses were observed across age and body mass index subgroups, indicating the adaptability of the personalized protocol. There was no significant difference between genders (p>0.05). Conclusion: A 12-week sport-specific flexibility intervention effectively improved posterior chain mobility in elite archers. These findings highlighted the importance of integrating personalized programs that consider biomechanical demands and regular assessment.

Structural Dynamics and Vibration with Multiple Degree of Freedom under Different Types of Loads

2025-05-15

Yan Gao , Zhengya Guo , Yifan Li +3 more

This project investigates the structural dynamics and vibration of a model that closely approximates real-world conditions. Obtaining model incorporates the critical parameters of density, stiffness, and damping to effectively simulate … This project investigates the structural dynamics and vibration of a model that closely approximates real-world conditions. Obtaining model incorporates the critical parameters of density, stiffness, and damping to effectively simulate mode shapes and floor displacements under natural frequencies, by varying these factors, the project aims to minimize mode shapes, thus optimize structural performance. The study demonstrates the importance of considering different kinds of damping in structural models and highlights the practical applications of our model in selecting appropriate materials and dampers. Future research can enhance this model through occupancy load, environmental forces and other factors, so as to further improve its accuracy and relevance to real situations.

Including limb-on-limb holonomic constraints in predictive simulation allows replicating athlete’s backflip technique

2025-05-15

Anaïs Farr , Eve Charbonneau , Mickaël Begon +1 more

Analytical Interpretation of the Early Literature on the Theory of Vibrations

2025-05-13

Allan D. Pierce

Control of Underactuated Systems Based on Machine Learning Model: Case Studies

2025-05-12

Ambrus Zelei

<title>Abstract</title> The rapid pace of industrial development has significantly increased the demand for virtual testing of machines and control algorithms. Besides traditional simulations, machine learning has become widespread: certain subsystems … <title>Abstract</title> The rapid pace of industrial development has significantly increased the demand for virtual testing of machines and control algorithms. Besides traditional simulations, machine learning has become widespread: certain subsystems or even the entire simulation model is replaced by neural network models.Besides existing concepts, this work explores the feasibility of employing neural network models to replace dynamic equations in multibody systems.The neural network model is developed using the MLP Regressor from Scikit-learn Python package in three levels: 1) forward dynamics of minimum-coordinate models and 2) constrained models and 3) the inverse dynamics control of underactuated multibody systems. The neural network model is utilized to represent the inverse dynamics model, for which the train data are generated using forward dynamic simulations. The study demonstrates that low degree-of-freedom planar systems can be approximated by middle-scale neural network models up to six hidden layers and 166 perceptrons, requiring training time of minutes on a personal computer.