Time-frequency analysis of hand-transmitted vibration of impact tools using analytic wavelet transform.
Kim J; Welcome DE; Dong RG; Song WJ; Hayden C
Proceedings of the first American conference on human vibration, June 5-7, 2006, Morgantown, West Virginia. Dong R, Krajnak K, Wirth O, Wu J, eds. Morgantown: WV: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2006-140, 2006 Jun; :16-17
Prolonged, extensive exposure to hand-transmitted vibration could cause a series of vibration-induced disorders in the vascular, sensorineural, and musculoskeletal structures of the human hand-arm system, which have been collectively called hand-arm vibration syndrome (HAVS).1 To assess the risk of HAVS the international standard ISO 5349-1 (2001)1 recommends using the root-mean-square (rms) acceleration of the measured vibration with a frequency weighting. While a few epidemiological studies have reported results consistent with the predictions made according to the recommendation, many other studies have reported results with large discrepancies. This may be partially attributed to the time-averaging effect involved in calculation of the frequency components, especially for impact type tools. Because the spectral characteristics of impact tools change dramatically with time, a time-frequency (T-F) analysis can provide better characterizations of such highly transient vibrations. The analytic wavelet transform (AWT) is an ideal T-F analysis tool because it possesses the advantages of both the Fourier transform and the wavelet transform. The objective of this study was to explore the application of the AWT method for characterizing the impact tool vibrations and assessing their exposure risk.
Vibration; Vibration-disease; Vibration-control; Vibration-effects; Vibration-exposure; Vibration-monitors; Analytical-models; Analytical-processes; Power-tools
Dong R; Krajnak K; Wirth O; Wu J
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Proceedings of the first American conference on human vibration, June 5-7, 2006, Morgantown, West Virginia