Vibration isolation - exploring the foundations
Keywords:Mathematical models, Supports, Point mobility, Surface mobility
AbstractThe interaction between a large isolator and a supporting structure is examined. Large area contact can result in a mobility which is significantly different from measured or predicted point mobility. Surface mobility measurements can help avoid situations where poor isolation occurs in important frequency ranges due to high surface mobility in the foundation. The models used show that surface mobility is approximately equal to point mobility when the dimensions of the contact region are small compared to the governing wavelength in the supporting structure. Mobility changes significantly once the contact dimensions are of the order of, or larger than, the governing wavelength in the supporting structure.
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