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标题：Time Domain Detection of Shocks and Impacts in Whole-body Vibration
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作者：Anthony J. BRAMMER ; George RODDAN ; James B. MORRISON 等
期刊名称：Industrial Health
印刷版ISSN：0019-8366
电子版ISSN：1880-8026
出版年度：2010
卷号：48
期号：5
页码：530-537
DOI：10.2486/indhealth.MSWBVI-01
出版社：National Institute of Occupational Safety and Health
摘要：A method for detecting shocks and impacts in whole-body vibration time histories has been developed that is suitable for implementation as a computer algorithm. The procedure consists of comparing the magnitudes of a higher-order mean value and the impulsiveness calculated for successive time segments of the acceleration-time history. The indicators were the ratio of the 12th-order root mean value to the root mean square RMT/RMS , and the impulsiveness corresponding to a cumulative probability value of 0.97, I (0.97) (i.e., the magnitude of the positive and negative excursions exceeded 3% of the time divided by 2 RMS ). Both indicators have a value of 2.16 for random vibration with a Gaussian amplitude distribution, and deviate from this value when the motion possesses other characteristics. For seat motion in the Z-direction analyzed using frequency weighting W_b, and time segments of ~20 s, shocks and impacts could be identified when RMT/RMS ≥ 2.5, and I (0.97) ≤ 2.6. A subjective visual classification of 160 exposures to vibration recorded in a range of military vehicles operating under different conditions was performed by a jury of two observers. The subjective classification agreed with computer identification of shocks and impacts in 94% of the cases.
关键词：Shocks;Impacts;Identification;Seat vibration;Time histories