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Vibration reducing device

  • US 20080103628A1
  • Filed: 10/24/2007
  • Published: 05/01/2008
  • Est. Priority Date: 10/30/2006
  • Status: Active Grant
First Claim
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1. A vibration reducing device that reduces the vibration of a control object, the vibration reducing device comprising:

  • a digital controller,a vibration state detection device connected with the digital controller that detects the vibration of the control object and generates an analog signal of the vibration of the control object;

    an input-side bandpass filter connected with the vibration state detection device, which has a passband that is narrower than a frequency range from a Nyquist frequency to a sampling frequency of the digital controller, and that contains no frequencies that are an integer multiple of the Nyquist frequency of the digital controller, and which allows a part of the analog signal that falls within the passband from the analog signal generated by the vibration state detection device to pass;

    an A/D conversion device arranged between the input-side bandpass filter and the digital controller that converts the analog signal that has passed through the input-side bandpass filter into a digital signal;

    a D/A conversion device connected with the digital controller that converts a digital feedback control signal, determined by the digital controller on the basis of the digital signal converted by the A/D conversion device, into an analog feedback control signal; and

    an actuator connected with the digital controller through the D/A conversion device that applies vibration to the control object on the basis of the analog feedback control signal converted by the D/A conversion device.

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