Biomechanical Response and Manual Tracking Performance in Sinusoidal, Sum-of-Sines, and Random Vibration Environments.
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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A set of manual control experiments was conducted to explore biodynamic response and tracking performance in sinusoidal, sum-of-sines, and randon z-axis vibration environments. Primary experimental variables were vibration spectrum, vibration amplitude, and stick spring gradient. Biomechanical response mechanisms were approximately linear for the vibration environments explored in this study and, with the exception of stick feedthrough, were independent of stick parameters. Tracking performance was degraded by vibration primarily through an increase in effective pilot time delay and through increased motor-related pilot remnant. Good model results were obtained by assuming that motor noisesignal ratio and time delay varied linearly with rms shoulder acceleration. A model-based mapping procedure was defined and validated for extrapolating the results of single-sine vibrationtracking experiments to complex vibration environments. Mapping in the reverse direction was also validated.
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