Multichannel narrowband control algorithm for mechanical active vibration isolation

Abstract

The invention relates to a multichannel narrowband control algorithm for mechanical active vibration isolation. A vibration sensor picks, close to a vibration source, reference signals, narrowband band pass filters of all frequency ranges that are divided in advance extract time domain line spectrum reference signals, a multichannel second-order filter operation is utilized to obtain reference signals that are filtered by secondary channel inverse models and that are used for self-adoptive control, and the convergence speed which is faster than the speed obtained by an FxLMS algorithm can be obtained while the stability is ensured. A phase difference compensator which only contains second-order parameters and enables on-line self-adaptive adjustment of the parameters to realized along with frequency fluctuations is in series connection behind the narrowband band pass filters, so no phase difference exists between the extracted line spectrum reference signals and the original reference signals prior to extraction. In this way, the optimal solution fluctuation of a controller caused by line spectrum frequency fluctuations is inhibited, and the robustness of the control algorithm for frequency fluctuations is improved. Through the multichannel narrowband control algorithm, the convergence speed is fast, the great frequency fluctuation robustness is exhibited, and control effects are great in mechanical vibration amplitude and frequency fluctuation conditions.

Description

technical field

[0001] The invention relates to a multi-channel narrow-band control algorithm for mechanical active vibration isolation. Background technique

[0002] Mechanical vibration contains rich and prominent line spectrum components. These line spectrum energy is concentrated and the amplitude is much higher than the surrounding frequency broadband noise, and the amplitude and frequency of each line spectrum will fluctuate with the mechanical operating conditions.

[0003] The line spectrum of ship machinery has an important influence on ship radiated noise. Active vibration isolation technology of mechanical equipment has been paid more and more attention as an effective means of suppressing line spectrum. In order to achieve better line spectrum control effect, the active control algorithm of mechanical active vibration isolation needs to break through the following difficulties: (1) There are multiple Line spectrum vibration needs to be controlled, and the tradit...

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