Active vibration reducing apparatus and method for identifying transfer function in active vibration reducing apparatus
First Claim
1. An apparatus for actively reducing a vibration, comprising:
- a vibration developing source;
a controlled vibration source arranged so as to be enabled to develop a controlled vibration to be interfered against the vibration developed from the vibration developing source;
a reference signal generator for detecting a vibration developed condition of the vibration developing source and generating and outputting the detected vibration developed condition as a reference signal;
a residual vibration detector for detecting a residual vibration after the interference of the controlled vibration against the vibration developed from the vibration developing source;
a controller for driving the controlled vibration source to reduce the vibration developed from the vibration developing source using a control algorithm including a transfer function established between the controlled vibration source and the residual vibration detector on the basis of the reference signal and the residual vibration signal;
an identification signal supplier for sequentially supplying individual discrete values of an identification signal which is a quantization of a time-continuous sinusoidal wave equally divided by a predetermined number to the controlled vibration source in synchronization with a predetermined output sampling clock;
a response signal reader for reading the residual vibration signal in synchronization with a predetermined input sampling clock when an identification vibration responding to the identification signal is developed from the controlled vibration source;
a transfer function identifier for identifying the transfer function included in the control algorithm on the basis of the residual vibration signal read by the response signal reader; and
a period setter capable of setting individually and independently periods of the predetermined output and input sampling clocks.
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Accused Products
Abstract
Described are a vibration actively reducing apparatus and a method for identifying a transfer function in the vibration actively reducing apparatus. An identification signal which is a quantization of at least one sinusoidal wave is supplied from a controller of the vibration actively reducing apparatus to a controlled vibration source in synchronization with a predetermined output sampling clock (SCo) to develop an identification vibration therefrom. The controller reads a residual vibration signal from a residual vibration detector of the actively reducing apparatus in synchronization with a predetermined input sampling clock (SCi). After read of the residual vibration signal as a time series data for each frequency, an FFT calculation is carried out for each time series data to extract a frequency component of the original sinusoidal wave. An inverse FFT calculation is, then, carried out for the result of the synthesis of each extracted frequency component to derive an impulse response as the transfer function.
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Citations
24 Claims
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1. An apparatus for actively reducing a vibration, comprising:
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a vibration developing source; a controlled vibration source arranged so as to be enabled to develop a controlled vibration to be interfered against the vibration developed from the vibration developing source; a reference signal generator for detecting a vibration developed condition of the vibration developing source and generating and outputting the detected vibration developed condition as a reference signal; a residual vibration detector for detecting a residual vibration after the interference of the controlled vibration against the vibration developed from the vibration developing source; a controller for driving the controlled vibration source to reduce the vibration developed from the vibration developing source using a control algorithm including a transfer function established between the controlled vibration source and the residual vibration detector on the basis of the reference signal and the residual vibration signal; an identification signal supplier for sequentially supplying individual discrete values of an identification signal which is a quantization of a time-continuous sinusoidal wave equally divided by a predetermined number to the controlled vibration source in synchronization with a predetermined output sampling clock; a response signal reader for reading the residual vibration signal in synchronization with a predetermined input sampling clock when an identification vibration responding to the identification signal is developed from the controlled vibration source; a transfer function identifier for identifying the transfer function included in the control algorithm on the basis of the residual vibration signal read by the response signal reader; and a period setter capable of setting individually and independently periods of the predetermined output and input sampling clocks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for actively reducing a vibration, comprising:
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vibration developing source means; controlled vibration source means arranged so as to be enabled to develop a controlled vibration to be interfered against the vibration developed from the vibration developing source means; reference signal generating means for detecting a vibration developed condition of the vibration developing source means and generating and outputting the detected vibration developed condition as a reference signal; residual vibration detecting means for detecting a residual vibration after the interference of the controlled vibration against the vibration developed from the vibration developing source means; controlling means for driving the controlled vibration source means to reduce the vibration developed from the vibration developing source means using a control algorithm including a transfer function established between the controlled vibration source means and the residual vibration detecting means on the basis of the reference signal and the residual vibration signal; identification signal supplying means for sequentially supplying individual discrete values of an identification signal which is a quantization of a time-continuous sinusoidal wave equally divided by a predetermined number to the controlled vibration source in synchronization with a predetermined output sampling clock; response signal reading means for reading the residual vibration signal in synchronization with a predetermined input sampling clock when an identification vibration responding to the identification signal is developed from the controlled vibration source means; transfer function identifying means for identifying the transfer function included in the control algorithm on the basis of the residual vibration signal read by the response signal reading means; and period setting means capable of setting individually and independently periods of the predetermined output and input sampling clocks.
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24. A method for identifying a transfer function in a vibration actively reducing apparatus, the vibration actively reducing apparatus comprising:
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a vibration developing source; a controlled vibration source arranged so as to be enabled to develop a controlled vibration to be interfered against the vibration developed from the vibration developing source; a reference signal generator for detecting a vibration developed condition of the vibration developing source and generating and outputting the detected vibration developed condition as a reference signal; a residual vibration detector for detecting a residual vibration after the interference of the controlled vibration against the vibration developed from the vibration developing source; and a controller for driving the controlled vibration source to reduce the vibration developed from the vibration developing source using a control algorithm including a transfer function established between the controlled vibration source and the residual vibration detector on the basis of the reference signal and the residual vibration signal, the method comprising the steps of; a) setting individually and independently periods of predetermined output and input sampling clocks; b) sequentially supplying individual discrete values of an identification signal which is a quantization of a time-continuous sinusoidal wave equally divided by a predetermined number to the controlled vibration source in synchronization with the predetermined output sampling clock; c) reading the residual vibration signal in synchronization with the predetermined input sampling clock when an identification vibration responding to the identification signal is developed from the controlled vibration source; and d) identifying the transfer function included in the control algorithm on the basis of the residual vibration signal read at the step c).
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Specification