Manual Control Performance and Dynamic Response during Sinusoidal Vibration
Final rept. Jul 1971-Jun 1972
SYSTEMS TECHNOLOGY INC HAWTHORNE CA
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A variety of dynamic response and performance measurements are presented for compensatory manual control tasks performed under both vertical, lateral, and fore-aft sinusoidal vibration. Special, on-line measurement techniques allowed the partitioning of error and control response variances into portions correlated with the tracking task and vibration inputs, and an uncorrelated or remnant portion. Vibration effects on visual-motor response were generally subtle, and the most sensitive effects occurred in error remnant and vibration-induced feedthrough to the control response. Dramatic increases in remnant were obtained under low-frequency lateral vibration with a low spring gradient displacement stick, while an isometric control showed little effect. As part of the study, body motion and control response measurements were used to develop biomechanical models of the vibration-to-control feedthrough process. Under vertical vibration a simplified model, based on the operators seat-to- shoulder transmissibility and a quasi-rigid arm linkage, was found to give an adequate description of vibration feedthrough.
- Stress Physiology
- Human Factors Engineering and Man Machine Systems