Vibration reducing device
First Claim
1. A vibration reducing device that reduces the vibration of a control object by a digital controller, the vibration reducing device comprising:
- a vibration state detection device that detects the vibration of the control object;
an input-side bandpass filter, which has a passband that is narrower than a frequency range from a Nyquist frequency of the digital controller to a sampling frequency, and that contains no frequencies that are an integer multiple of the Nyquist frequency of the digital controller, and which allows the vibration that falls within the passband from the vibration detected by the vibration state detection device to pass;
an A/D conversion device that converts the analog signal that has passed through input-side bandpass filter into a digital signal;
a D/A conversion device that converts a feedback control signal, determined by the digital controller on the basis of the digital signal converted by the A/D conversion device, from a digital signal into an analog signal; and
an actuator that applies vibration to the control object on the basis of the analog signal converted by the D/A conversion device.
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Accused Products
Abstract
A vibration reducing device that reduces the vibration of a control object includes a digital controller. A vibration state detection device detects the vibration of the control object and generates an analog signal of the vibration of the control object. An input-side bandpass filter 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. The input-side bandpass filter 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 converts the analog signal that has passed through the input-side bandpass filter into a digital signal. A D/A conversion device 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. An actuator applies vibration to the control object on the basis of the analog feedback control signal converted by the D/A conversion device.
19 Citations
18 Claims
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1. A vibration reducing device that reduces the vibration of a control object by a digital controller, the vibration reducing device comprising:
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a vibration state detection device that detects the vibration of the control object; an input-side bandpass filter, which has a passband that is narrower than a frequency range from a Nyquist frequency of the digital controller to a sampling frequency, and that contains no frequencies that are an integer multiple of the Nyquist frequency of the digital controller, and which allows the vibration that falls within the passband from the vibration detected by the vibration state detection device to pass; an A/D conversion device that converts the analog signal that has passed through input-side bandpass filter into a digital signal; a D/A conversion device that converts a feedback control signal, determined by the digital controller on the basis of the digital signal converted by the A/D conversion device, from a digital signal into an analog signal; and an actuator that applies vibration to the control object on the basis of the analog signal converted by the D/A conversion device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of reducing the vibration of a control object by a digital controller, the method comprising:
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detecting the vibration of the control object with a vibration state detection device; passing the vibration through an input-side bandpass filter, which has a passband that is narrower than a frequency range from a Nyquist frequency of the digital controller to a sampling frequency, and that contains no frequencies that are an integer multiple of the Nyquist frequency of the digital controller; converting the analog signal that has passed through input-side bandpass filter into a digital signal; converting a feedback control signal, determined by the digital controller on the basis of the digital signal, from a digital signal into an analog signal; and applying vibration to the control object on the basis of the analog signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification