![]() ![]() To use the chart, determine the lowest rotation speed of the equipment and consider this to be the disturbing frequency. It is also grouped into zones suggesting isolation efficiency ranges appropriate to different applications. ![]() ![]() This chart illustrates the theoretical relationship between isolation efficiency, disturbing frequency and static deflection (or dynamic natural frequency) for a simple isolation system on a rigid foundation. Both situations require engineered vibration control systems which give predictable results appropriate to the surrounding environment. Similarly, in general industry, the output of vibration producing equipment is increasing whilst the community and workforce demand improved living and working conditions, free from vibration or structure-borne noise. Equipment vibration can therefore be a major problem in such flexible structures. At the same time, increasingly powerful air-conditioning and auxiliary equipment is needed and may often be installed in upper level plant-rooms. In building construction, improved design allows lighter but inherently more flexible structures to be used. However, with greater expectations and expanded knowledge, such methods of isolation are now inadequate, both in large building structures and in the general industrial environment. In the past, unwanted machine vibration could be isolated by placing the equipment on top of cork or felt. ![]()
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