Method for reducing noise and/or vibration from multiple rotatin

Details Method for reducing noise and/or vibration from multiple rotatin Method for reducing noise and/or vibration from multiple rotatin

1996-10-22

1998-08-04

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

244 1N, 364574, 381 71, 416 34, G01N 100

Patent

active

057896780

ABSTRACT:
A method for reducing the total operating noise and/or the total vibration of at least two generally-identical rotating machines. In one embodiment, the noise (or vibration) contribution of each machine at a predetermined reference relative phase angle is estimated. Optimum phase angles are calculated by minimizing a cost function which includes such estimated noise (or vibration) contributions and each rotating machine's relative phase angle. In another embodiment, the gradient of a weighted sum of a measure of the magnitude of the acoustic pressure amplitude of the total operating noise (or the amplitude of the total vibration) is measured. Each machine phase angle is adjusted by a predetermined increment opposite in sign to its associated gradient. The measuring and adjusting are repeated until the gradient is within a limit.

REFERENCES:
patent: 4689821 (1987-08-01), Salikuddin et al.
patent: 4947356 (1990-08-01), Elliott et al.
patent: 5148402 (1992-09-01), Magliozzi et al.
patent: 5150855 (1992-09-01), Kaptein
patent: 5221185 (1993-06-01), Pla et al.
patent: 5453943 (1995-09-01), Magliozzi
patent: 5551649 (1996-09-01), Kaptein
Johnston et al., "Propeller Signatures and Their Use", AIAA 80-1035 (1980).

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