The discomfort caused by 1-Hz and 2-Hz vertical sinusoidal vibration has been studied with 20 seated subjects, using the method of magnitude estimation. The sinusoidal transients were superimposed on an 80-s background vibration which consisted of a 1-oct band of random vibration, centered on 1 Hz, with a magnitude of 0.63 m s−2 rms. The transients were added at five magnitudes (0.63–1.6 m s−2 rms) and seven durations (1–60 s). Male and female subjects produced comparable results and similar discomfort was produced by the two frequencies of vibration. Discomfort increased when the magnitudes or the durations of the transients were increased. Of alternative methods of predicting the discomfort, the overall vibration dose values gave the highest correlations with subject estimates, followed by the overall root-mean-square accelerations. A lower correlation was found with peak acceleration and the lowest correlation was with a running rms measurement, using a 1-s window.
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Ruffell et al. (1995) studied this question.