FxLMS filtering method for narrow-band active vibration system

Abstract

The invention relates to an FxLMS filtering method for a narrow-band active vibration system. A vibration signal d (n) is obtained by using a non-acoustic sensor at a system input terminal and a reference signal x (n) is generated based on the vibration signal d (n); a variable-power swept-frequency signal is adopted in secondary channel identification; after the reference signal x (n) is filtered, FXLMS algorithm weight iterative calculation is performed by combining a residual signal e (n) to obtain a vibration suppression signal y (n); and the vibration suppression signal y (n) and a secondary channel input signal v (n) are superposed and the superposed signals are subtracted from a low-frequency harmonic vibration signal d (n) to realize vibration suppression. Compared with the commonwhite noise of the classical FXLMS algorithm, the swept-frequency signal with concentrated energy distribution can obtain a high-quality measurement result in a frequency range of a narrow-band activevibration suppression system. The residual error of the whole narrow-band active vibration suppression system can be reduced. The method has the advantages: a stable secondary channel modeling valuecan be obtained in the synthesized frequency range for the narrow-band active vibration suppression system; the system residual error is reduced; and a better vibration suppression effect is realized.

Description

technical field [0001] The invention belongs to the technical field of vibration control, and relates to an FxLMS filtering method for a narrow-band active vibration system, in particular to an active suppression method that ensures the stability of secondary channel modeling in a narrow-band active vibration system and achieves better vibration suppression effects. vibration method. Background technique [0002] In engineering practice, the vibration and noise generated by many mechanical products and equipment are caused by rotating machinery, such as rotors, engines, compressors, turbines and pumps. The vibration generated by these mechanical devices is usually a periodic signal, which has a large number of narrow-band components on the basis of its fundamental frequency and harmonics, and its characteristic is that the noise power is mainly concentrated on one or several specific powers in the spectrum. . Active control systems are more effective in suppressing narrow-...

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Problems solved by technology

[0004] In order to avoid the deficiencies of the prior art, the present invention proposes a FxLMS filtering method for narrow-band active vibration systems, and for narrow-band active vibration systems in the classic FXLMS algorithm based on secondary channel online identification of white noise secondary channel modeling In the case of unstable effect, an active vibration suppression method based on the online identification of the secondary channel of the variable power sweep signal is proposed

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