Vibration reducing device
First Claim
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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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.
11 Citations
18 Claims
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1. A vibration reducing device that reduces the vibration of a control object, the vibration reducing device comprising:
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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. - 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, the method comprising:
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detecting the vibration of the control object with a vibration state detection device; generating an analog signal of the vibration of the control object; passing the analog signal through an input-side bandpass filter, which has a passband that is narrower than a frequency range from a Nyquist frequency to a sampling frequency of a digital controller, 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 the input-side bandpass filter into a digital signal; determining a digital feedback control signal on the basis of the digital signal; converting the digital feedback control signal into an analog feedback control signal; and applying vibration to the control object on the basis of the analog feedback control signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification