PERFORMANCE AND PHYSIOLOGICAL EFFECTS OF LONG TERM VIBRATION.
Final rept., 7 Jul 65-1 Jun 66,
LOCKHEED-GEORGIA CO MARIETTA LOCKHEED GEORGIA RESEARCH LAB
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The present study was designed to investigate human performance as a function of selected parameters of simulated, random, vertical vibration environments. Twelve volunteers were subjected to four different vertical vibration environments for 6 hours at a session. The vibration environments varied with respect to acceleration level 0.12G RMS and 0.16G RMS and with respect to the frequency distribution of acceleration power. Both acceleration power density spectra employed had significant frequency components in the frequency range of 1 to 6 cycles per second, but differed in the location of peak acceleration power. During vibration and control sessions, subjects were required to perform a task complex that included two-dimensional, compensatory tracking and secondary visual and auditory loading tasks. Performance measures were taken for 45 minutes of each hour. Heart rate, respiration rate, and skin temperature measures were also recorded. Tracking error scores on both axes were significantly larger under all vibration conditions than those scores obtained during static test sessions. The two acceleration levels investigated did not differentially affect tracking error. The results of a supplemental investigation indicated that tracking performance was degraded more by a spectrum that had peak power at 5 cps than one with a similar frequency content but with a peak power at 2 cps.
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