Subjective and associated objective response to repeated mechanical shocks in seated humans

摘要: The purpose of the present study was to describe subjective response shock exposures containing realistic ranges parameters motion including amplitude, frequency, axis, direction and duration exposure. subsequent objectives were correlate with associated biomechanical (transmission acceleration) assess computational biodynamic methods evaluating exposure such as Vibration Dose Value (VDV) Dynamic Response Index (DRI). Two main types experiments used: one which examined rating severity single shocks different amplitudes, axes directions over a range waveforms (frequency); another that comfort, predicted tolerance, tiredness repeated shocks. involved exposing 54 seated males signatures delivered by simulator (+x, +y, +z axes; 0.5 g 4 g; 2 20 Hz waveforms; 5.5 minute 7 hour duration). Results demonstrated closely correlated for all (positive direction: r2=0.918 r2=0.958; negative r2=0.872 r2=0.954). Subjective poorly outputs biodynarnic models filters, except Fairley-Griffin DM (8.4Hz) positive z axis (r2=0.985 r2=0.959, respectively). Exposure had significant time-dependence long term up hours (p<0.05). Both short (15 30 minutes) (overnight) rest intervals significantly improved ratings did not support timeor amplitude-dependency VDV. shows need develop new dose model has frequency response, amplitudeand time-dependency designed enable prediction human mechanical