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Instrumentation power supply and read unit for testing gearboxes through various speeds and gears

  • US 5,661,659 A
  • Filed: 11/06/1996
  • Issued: 08/26/1997
  • Est. Priority Date: 05/01/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for testing gearboxes for predetermined noise characteristics comprising:

  • a plurality of test instruments, each adapted to provide an output signal indicative of an operating condition of a gearbox under test as it is cycled through various speeds and gears, said test instruments including at least one microphone;

    circuit means electrically coupled to said test instruments and adapted to selectively receive said test instrument output signals and at least one signal indicative of the operating speed of said gearbox;

    processor means for providing the root mean square of said microphone output signal;

    filter means electrically coupled to said circuit and processor means for selectively obtaining said root mean square determination at predefined frequencies to which the human ear is sensitive; and

    computer means for determining the filtered root mean square of the noise produced by the gearbox at varying operating speeds.

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