Replacement Of Rigid Soil By An
Elastic Material For The Reduction Of
Sensitive Machine Vibrations
Author(s)
G. Rosenhouse, F. Kirzhner & Y. Zimmles
Abstract
Elastic mountings are necessary for reducing the effect of environmental
vibrations on sensitive machinery. The common method is the application of
artificial polymeric, fibrous materials or metal springs as elastic mountings. Such
mountings necessitate control and maintenance. It is much more attractive to use
materials that do not deteriorate over time, at least for a few decades. This is due
to the fact that in order to get the effect of "mass-spring" response, a heavy mass
that supports the sensitive system is laid over an elastic material. At least a
partial solution can be obtained by soil replacement of the rock underneath the
foundation. However, it is illustrated here numerically that the result is strongly
dependent on the spectrum of the system response, and in certain cases incorrect
design may even cause weakening of the isolation.
Keywords: soil mechanics, elastic isolation, soil replacement, vibrations,
spectral response.
1 Introduction
Regular design of foundations isolation considers the natural properties of the
existing ground. However, under certain circumstances, the ground, on which the
foundation is intended to be built, is too hard and/or non-uniform. In the first
case the protected machine may suffer severe vibrations that are beyond its
capacity, or may lead to damages, such as defects in the products of the machine.
In the second case, the non-uniformity of the ground under the foundation can
lead to differential settlement, cracks in the structure and even instabilities. A
change in the mechanical properties of the soil under the foundation can be used
Keywords
soil mechanics, elastic isolation, soil replacement, vibrations,
spectral response.
Related Book
Other papers in this volume
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