A fxlms filtering method for narrowband active vibration systems

Abstract

The invention relates to a FxLMS filtering method for a narrow-band active vibration system. A non-acoustic sensor is used to obtain a vibration signal d(n) at the input end of the system, and a reference signal x(n) is generated according to the vibration signal d(n). The identification adopts variable power frequency sweep signal. After filtering the reference signal x(n), combined with the residual signal e(n), it is used to iteratively calculate the weight value of the FXLMS algorithm to obtain the vibration suppression signal y(n). The vibration suppression signal y(n) is obtained by n) is superimposed on the secondary channel input signal v(n) and subtracted from the low-frequency harmonic vibration signal d(n) to suppress vibration. Compared with the white noise commonly used by the classic FXLMS algorithm, the swept frequency signal with concentrated energy distribution can obtain high-quality measurement results in the frequency range of the narrow-band active vibration suppression system. Reduce the residual error of the entire narrowband active vibration suppression system. The advantage of this method is that for a narrow-band active vibration suppression system, a relatively stable secondary channel modeling value can be obtained in the synthesized frequency range, which reduces the system residual error and achieves a better vibration suppression effect.

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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