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CDM uses 3 different standard diameters of air cushions (other diameters are however available if needed), to know: the 4,5'', the 6'' and the 12'', each of which can come with 1 or 2 lobs. The higher the air volume, the lower the resonance frequency of the isolator, and thus the better the isolation performance. Air cushions are normally applied when resonance frequencies below 3Hz are required, which can be the case when dealing with machine isolation. Air cushions are never used for building or track isolation.
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It needs to be noted that air cushions show practically no damping, so one must be certain not to have any input of vibration energy at the resonance frequency of the air cushion, since it is very difficult to add damping to such a device. One could consider to install elastic buffers at certain strategical locations, in order to limit the machine movements during start up and slow down regime.
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SELECTION OF AN AIR CUSHION
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The air cushion is selected by the load it has to carry. The load range of an air cushion is indicated on each datasheet. The height (1 or 2 lobs) is function of the required resonance frequency.
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