Discomfort judgements of translational and angular whole-body vibrations
Shoenberger, R.W.
Aviation Space and Environmental Medicine 53(5): 454-457
1982
ISSN/ISBN: 0095-6562 PMID: 7092753 Document Number: 194515
In a previous series of experiments the subjective intensities of translational (Z-axis) and angular (roll, pitch and yaw) vibrations were compared , using a psychophysical matching technique. To test the validity and generality of the matching results, an independent set of similar data was obtained in the present experiment, using the method of category production. Seated subjects set levels of translational vibrations, in the X-, Y- and Z-axes, and angular vibrations, in roll and pitch, that they judged to be uncomfortable on a scale of vibration discomfort. Frequencies of 2.5, 3.15, 4.0, 5.0, 6.3 and 8.0 Hz were presented in each vibration direction. As frequency increased the mean acceleration judged to be uncomfortable increased for Y-axis and roll vibrations, decreased for Z-axis vibrations and was essentially constant for X-axis and pitch vibrations. The Y- and Z-axis results corresponded well to equal intensity contours in existing vibration exposure criteria, and the roll results show good agreement with data from the roll matching experiment. The X-axis and pitch results are similar to the results from the pitch matching experiment and indicate the importance of the backrest in determining the effects of X-axis translational vibrations and angular vibrations in pitch.