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Abstract
Abstract This paper considers the elastic material for, and design of, elastic mountings intended for the prevention of transmission of vibration from electrical apparatus into the structure of buildings in which comparative quiet is desired. The effectiveness of such a support depends on the square of the ratio of the frequency of the impressed disturbance to the natural frequency of the machine on its mounting. Thus the natural frequency of the machine on its mounting must be made low in comparison with the impressed frequency. It is shown analytically that damping, or internal friction, in an elastic mounting causes additional transmission through the mounting. An apparatus was built to compare directly the effectiveness of materials proposed for elastic support. The detrimental effect of damping is clearly shown at high ratios of impressed frequency to natural frequency, causing the transmission to be doubled in the case of some samples. Therefore when choosing the elastic material for a support it is necessary to consider the damping present in the substance. Drift tests were also made to aid in determining the best material for this work. In several ways rubber appears to be well suited to use as an elastic support material. As an example, its incorporation in a mounting for a 15-hp. induction motor is described.
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