By Comité de Trauma del Colegio Americano de Cirujanos
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Whole-body vibration standards are summarized in Chapter 10. The principles involved in the measurement of whole-body vibration exposures are presented in Chapter 11 and some examples of vibration conditions are given in Chapter 12. 2 Some general observations Given the opportunity to expose themselves to vibration in the laboratory, readers would make a range of observations which would greatly assist their understanding of both vibration and h u m a n response to vibration. e. a 5s period) has a peak-to-peak displacement of almost 2 m and would probably remind the reader of the vertical oscillations of a ship.
The same magnitude of acceleration with a frequency of 1 Hz has a peak-to-peak displacement of about 70 m m and may remind the reader of the side-to-side motion experienced in a train on a very rough section of track. At 5 Hz the frequency is similar to that which occurs during laughter and an acceleration of 1 m s r . m . s . will feel vaguely like the vertical vibration on the seat of a small old car on a rough road, the motion has a peak-to-peak displacement of almost 3 m m . 0 m s " r . m .
5(d) the contours are all parallel and so the effect of frequency is considered to be independent of vibration magnitude. However, all four graphs show the same data: only the axes have been changed! In every case there is a linear response in the sense that for all contours at a given frequency a given change of frequency gives rise to the same percentage change in the vibration magnitude. It is now c o m m o n Frequency (linear scale) Frequency (log scale) Fig. 5 Effect of logarithmic axes on the shape of equivalent comfort contours.