Whole body vibration of heavy equipment operators.
Wasserman-DE; Asburry-WC; Doyle-TE
Shock Vib Bull, Bulletin 49 1979 Sep; :47-68
Engineering field studies were undertaken to quantify and describe the vibration exposure received by workers while they operated various types of heavy equipment vehicles under actual working conditions. The instrumentation, the study methods, and the data collection and processing of the engineering field study were described it this report. The subjects were four professional heavy equipment operators. The findings seemed to indicate there is little difference in the human response to vibration and shock between experienced and inexperienced operators. There also appeared to be little difference in spectra between operators of differing body masses. The authors suggest that there is a single vibration transmission path to the operator's upper torso and head from the vehicle occurring directly through the operator's seat and torso. In the case of the operator's seat, the vibration impinging on the upper torso was modified by the filtering characteristics of the seat. Most of the higher acceleration levels measured occur in frequency bands below the 4 to 8 hertz (Hz) human body resonance band with much of the data occurring at less than 1Hz. They suggest that these very low frequency peaks are due to changes in vehicle path or speed, steering through turns, and changing grades of side slopes in the terrain.
Equipment-operators; Construction-equipment; Vibration-exposure; Construction-workers; Humans; Occupational-exposure; Workplace-studies
Shock and Vibration Bulletin, Bulletin 49