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Energy transformations in human movement by contact.

B Khosravi-Sichani1, H Hemami, S Yurkovich

  • 1Department of Electrical Engineering, Ohio State University, Columbus 43210.

Journal of Biomechanics
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

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This study investigates energy transformation in multilinkage systems during ground impact. Friction

Area of Science:

  • Robotics and Biomechanics
  • Multilinkage System Dynamics
  • Friction and Impact Analysis

Background:

  • Understanding energy transformation in complex mechanical systems is crucial for designing efficient robots and prosthetics.
  • The role of ground contact and surface friction in dynamic system behavior is often simplified, necessitating detailed investigation.
  • Previous models may not fully capture the nuances of energy transfer during impact events in multilinkage systems.

Purpose of the Study:

  • To derive the directional change of translational velocity of the center of mass in multilinkage systems using ground contact.
  • To analyze the effect of the coefficient of friction on the overall movement of general multilinkage systems during impact.
  • To explore the distinct behaviors of slippage and no-slippage conditions at impact through simulation.

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Main Methods:

  • Derivation of translational velocity changes based on ground contact mechanics.
  • Development of a general framework for analyzing multilinkage systems undergoing impact.
  • Simulation studies using a two-link system to illustrate the effects of surface friction.
  • Comparative analysis of energy transformations under slippage and no-slippage conditions.

Main Results:

  • The study quantifies the directional change in translational velocity of the center of mass due to ground interaction.
  • It is observed that translational energy increases with angular velocity once the system stops on the surface.
  • Rotational energy post-impact increases with the angular velocity of the first link, with a lower rate of increase in the no-slippage scenario.

Conclusions:

  • Ground contact and surface friction significantly influence energy transformation in multilinkage systems.
  • The system's behavior during impact is highly dependent on whether slippage occurs.
  • This research provides insights into optimizing energy management in dynamic systems through controlled friction and impact.