Using A "Sound Tube" To Measure Noise Of Structural Sources In High Background Noise Environments
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Described in this paper is a device referred to as a soundtube, which has been designed to accurately measure only the normal component of the surface velocity of a vibrating structural noise source. Both laboratory and field data are presented. Significant advantages of the sound tube over an accelerometer for surface velocity measurements are: l. Soundtube is not sensitive to high-level off-axis vibrations of the surface which do not contribute to sound radiation. 2. Since the soundtube is simply pressed against the surface, measurements can be made over surfaces which are lagged with insulation or are covered with ice. The most useful application of the sound tube has been to estimate noise radiation from various structural noise sources such as compressors and p1pmg in environments with high background noise levels. By assuming that the source has a radiation efficiency which is equal to or less than unity, an upper limit of the noise radiation from each source component can be accurately determined.
Rainey, James T.; Kushner Frank (1980). Using A "Sound Tube" To Measure Noise Of Structural Sources In High Background Noise Environments. Texas A&M University. Gas Turbine Laboratories. Available electronically from