Discomfort of vertical whole-body shock-type vibration in the frequency range of 0.5 to 16 Hz |
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Authors: | S J Ahn |
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Institution: | 1.Vehicle Quality Engineering Department,Renault-Samsung Motor Company,Busan,Korea |
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Abstract: | Shock-type vibrations are frequently experienced in vehicles excited by impulsive input, such as bumps in the road, and cause
discomfort. Current national and international standard weightings were primarily developed for assessing exposure to sinusoidal
or random vibrations and not impulsive excitations or shocks. In this experimental study, various shock signals were systematically
produced using the response of a one degree-of-freedom vibration model to hanning-windowed half-sine force input. The fundamental
frequency of the shock was varied from 0.5 to 16 Hz at a step of 1/3 of an octave. The magnitude estimation method was used
for fifteen subjects to compare the discomfort of shocks with various unweighted vibration dose values between 0.35 ms−1.75 and 2.89 ms−1.75 at each frequency. The equivalent comfort magnitude of shock showed greater sensitivity at frequencies less than 0.63 Hz
and at the resonance frequency of the human body between 5.0 Hz and 6.3 Hz. The frequency weighting constructed by using both
the equivalent comfort magnitude and the growth rate of discomfort obtained in this study was compared with the current standard
weightings, Wb of BS 6841 and Wk of ISO 2631. The derived weightings for shock were applied to the acceleration of the shocks, and an enhanced correlation
was proved between the magnitude estimations and the weighted physical magnitude of shock. |
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