Abstract
It has previously been shown that very good isolation characteristics could be obtained from vibration isolators if the isolator properties (for example, stiffness) were made frequency dependent. In this paper a system of this type is described which uses the fact that low-frequency pressure fluctuations are transmitted more readily through a capillary tube than high-frequency fluctuations. This is used to modify the isolator properties in such a way that its isolation characteristics for both shock forces and steady harmonic forces throughout the frequency range are very good. The drawbacks of earlier systems of this kind have been avoided by the introduction of an inertia block which considerably improves the high-frequency behaviour of the isolator.
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