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Kurtosis Regulating Vibration Controller Apparatus and Method

  • US 20100305886A1
  • Filed: 05/28/2010
  • Published: 12/02/2010
  • Est. Priority Date: 06/01/2009
  • Status: Abandoned Application
First Claim
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1. A controlled-kurtosis vibration controller which provides an excitation random signal to an actuator in response to an input from a motion transducer, the controlled-kurtosis vibration controller comprising:

  • a Gaussian spectrum generator which generates a frequency-domain Gaussian distributed random spectrum;

    a non-Gaussian spectrum generator which generates a frequency-domain non-Gaussian distributed random spectrum, wherein the non-Gaussian spectrum generator receives an input signal based on the input from the motion transducer, generates a scalar kurtosis estimate from the input signal, compares the scalar kurtosis estimate to a target value, uses a result of the comparison to generate a time-domain envelope with attributes including amplitudes-of-transients and numbers-of-transients, uses the time-domain envelope to modulate a time-domain random signal, and transforms the modulated time-domain random signal into a frequency-domain non-Gaussian distributed random spectrum;

    an inverse transfer function generator which modulates the respective spectra from the Gaussian and non-Gaussian spectrum generators, wherein the inverse transfer function generator receives the input signal and frequency-domain transforms the input signal into an input spectrum, the inverse transfer function generator receives a vibration controller output drive signal and frequency-domain transforms the vibration controller output drive signal into an output drive spectrum, the input spectrum and the output drive spectrum are processed to produce an estimate of cross power spectrum density, the output drive spectrum is processed to produce an estimate of drive auto power spectrum density, the estimate of cross power spectrum density and the estimate of drive auto power spectrum density are respectively averaged, and the respective averages are divided to generate a frequency-domain inverse transfer function; and

    a synthesizer which generates the vibration controller output drive signal, wherein the Gaussian and non-Gaussian spectra are respectively multiplied by the frequency-domain inverse transfer function, and the respective multiplier outputs are summed and transformed into the vibration controller output drive signal, which is fed back to the actuator as the excitation random signal.

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