Method and apparatus for influencing background noise of machines having rotating parts
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United States of America Patent
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May 28, 2002
Grant Date -
N/A
app pub date -
Jun 14, 1999
filing date -
Jun 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and a shaft bearing for influencing machine background noise emitted by at least by one rotating part of the machine, especially for influencing the background noise within a passenger compartment of a motor vehicle. The amplitudes and/or the frequencies of primary vibrations which cause the background noise are preferably lessened and/or supplemented by controlled external interventions. The mounting conditions between the shaft bearing and a rotating part held in the machine shaft bearing, especially a shaft, is varied by a radial adjustment unit having piezo elements. The transfer function of the vibrations, especially the vibrations producing the sound waves, present between the rotating part and the shaft bearing or a component in contact with the shaft bearing, is varied.
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