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Measurement of the impulsive bone motion by skin-mounted accelerometers
W Kim1, A S Voloshin, S H Johnson
1Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015.
Journal of Biomechanical Engineering
|February 1, 1993
Summary
A new measurement system for lower extremity wave propagation was developed. Skin-mounted accelerometers (SMA) overestimated bone-mounted accelerometers (BMA) by 12% between 15-30 Hz.
Area of Science:
- Biomechanics
- Biomedical Engineering
- Signal Processing
Background:
- Investigating wave propagation in the lower extremity is crucial for understanding injury mechanisms.
- Accurate acceleration measurement is essential for dynamic biomechanical analysis.
- Existing methods may suffer from time lag and amplitude reduction.
Purpose of the Study:
- To design and validate a measurement system for longitudinal wave propagation in the lower extremity.
- To minimize time lag and amplitude reduction in acceleration measurements.
- To compare accelerations measured by skin-mounted and bone-mounted accelerometers.
Main Methods:
- Designed a measurement system to simultaneously record skin and bone accelerations.
- Conducted in vitro experiments to capture dynamic signals.
- Developed a linear spring/damper model for the skin-bone interface.
Main Results:
- The measurement system aimed for zero phase and constant gain across the frequency range.
- Simultaneous skin and bone acceleration measurements were obtained.
- The Skin Mounted Accelerometer (SMA) overestimated Bone Mounted Accelerometer (BMA) by 12% in the 15-30 Hz range.
Conclusions:
- The developed system provides insights into wave propagation dynamics.
- The SMA shows a notable overestimation compared to BMA within a specific frequency band.
- Further refinement is needed to improve SMA accuracy for dynamic biomechanical studies.