Abstract
In liquid-filled piping systems large coupling exists between water column vibrations and flexural pipe-wall vibrations. This fact and the difficulties associated with determination of sound pressure levels in the water suggested the evaluation of noise reducing components in terms of their reduction of flexural pipe-wall vibrations. A test setup was developed in which test components such as flexible couplings, isolating hangers, and various damping devices were mounted at the center of the test pipe. Broad-band noise was introduced into the water or the pipe wall at one end of the system. Pipe-wall vibrations were detected by accelerometers at points on opposite sides of the test components, and were analyzed by means of an octave filter set. The effect of entrapped air and other test conditions on the accuracy and repeatability of data was investigated. The test setup and techniques will be discussed and test results obtained for various types of noise reducing components will be presented.
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