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System and method for generation and control of mechanical vibration

  • US 8,942,930 B2
  • Filed: 03/05/2012
  • Issued: 01/27/2015
  • Est. Priority Date: 03/05/2012
  • Status: Active Grant
First Claim
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1. A method for controlling a vibration-producing device, comprising:

  • continuously sensing vibration from the device to obtain a vibration signal in a time domain;

    transforming the vibration signal into a frequency domain;

    measuring both a frequency spectrum and an amplitude distribution of the vibration signal;

    separately comparing the measured frequency spectrum and at least one statistical characteristic of the amplitude distribution against respective reference values of the same;

    independently adjusting both the frequency spectrum and a randomized phase in response to results of the comparison, the randomized phase having a specified non-uniform distribution of phases according to a target of the statistical characteristic;

    combining, in the frequency domain, the adjusted frequency spectrum with the randomized phase on a frequency-by-frequency basis;

    converting the combined signal back into a time domain to obtain a drive signal; and

    applying the drive signal to the vibration-producing device.

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