By Ian Allan
While numerous generations of small boys can have dreamed of changing into engine drivers, and the top-link driving force at the nice named expresses of the age of steam could have been the head of the railways, when it comes to renowned belief, those members may possibly basically have gotten there with the help of myriad different trades and after years of progressing in the course of the extra junior grades of footplate employees. From the standard junior porter via to the chairman of the board, the railways hired an enormous array of other trades, all of whom have been crucial in holding the trains operating. a few of these jobs, resembling that of the tune gangs, are nonetheless an incredible a part of the upkeep of the trendy railway, yet many others, akin to blacksmiths, have now disappeared.
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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.