HUMAN PERFORMANCE UNDER RANDOM AND SINUSOIDAL VIBRATION.
Final rept., Apr 64-May 65,
HUGHES AIRCRAFT CO CULVER CITY CALIF
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Two experiments tested human subjects under whole-body vertical vibration to 1 compare effects on performance of 5 cps sinusoidal, 5 cps random amplitude, and 4-12 cps random vibration equated on the basis of power, and 2 determine acceleration levels at which significant performance decrements are found for each type of vibration. The complex experimental task required two-dimensional compensatory tracking, visual monitoring, and auditory monitoring during 20-minute vibration exposures at levels equated to 5, 15, 25, and 30 percent of the 1-minute human tolerance values for 5 cps sinusoidal vibration. Performance decrements under vibration were restricted to tracking, the most demanding component of the task complex. Tracking performance deteriorated with increasing acceleration levels of each type of vibration. Overall performance differences associated with the different types of vibration equated on the basis of power were not significant. A number of task and procedural variables, including task difficulty, work-rest cycle, and prior experience appear to be important determinants of performance capabilities and fatigue effects found in vibration studies, indicating a need for further investigation of these variables. Author
- Stress Physiology