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Method of and apparatus for cancelling vibrations from a source of repetitive vibrations

  • US 4,566,118 A
  • Filed: 07/25/1983
  • Issued: 01/21/1986
  • Est. Priority Date: 11/26/1981
  • Status: Expired due to Term
First Claim
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1. A method of generating a synchronising signal for an active vibration cancelling system in which a primary vibration, from a source of repetitive vibrations, entering a location is at least partially nulled by a specially generated secondary vibration fed to the location, the synchronising signal being used to synchronise the secondary vibrations to said source of repetitive vibrations, characterised in that the synchronising signal is obtained from the output of a residual vibration sensor located at said location by combining an electrical output from the vibration sensor with an electrical signal derived from the source of the secondary vibration.

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