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A simple force platform.

F Bonde-Petersen

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    This study details a novel force platform designed for accurate force measurement. The platform exhibits consistent static and dynamic force responses, crucial for biomechanical analysis.

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    Area of Science:

    • Biomechanics
    • Sensor Technology
    • Experimental Physics

    Background:

    • Accurate measurement of static and dynamic forces is essential in various scientific disciplines.
    • Existing force measurement systems may have limitations in sensitivity, response linearity, and dynamic calibration.
    • Development of a robust and calibrated force platform is needed for reliable data acquisition.

    Purpose of the Study:

    • To design and characterize a novel force platform for measuring static and dynamic forces.
    • To ensure the platform provides a signal independent of the point of force application.
    • To calibrate the platform's response to dynamic forces, particularly during vertical jumps.

    Main Methods:

    • Construction of a force platform using steel, Rockwool, and concrete plates.

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  • Integration of four steel rings, each with strain gauges, connected to a measuring bridge.
  • Adjustment of strain gauge sensitivity for uniform pressure response across the platform surface.
  • Calibration of dynamic forces using vertical jump analysis and time-of-flight calculations.

    • Main Results:

    • The force platform demonstrated a linear response for static forces up to 500 kiloponds (kp) with a stable zero value.
    • Dynamic force measurement revealed a resonance frequency of approximately 50 Hz and a damping factor of 0.15.
    • Calibration indicated a significant (11%) discrepancy in time of flight compared to force-time relations, attributed to system damping and landing technique.

    Conclusions:

    • The developed force platform offers a stable and linear response for static force measurements.
    • The platform's dynamic characteristics, including resonance frequency and damping, are defined.
    • Discrepancies in dynamic calibration highlight the importance of considering system damping and subject-specific movement patterns.