The error of the secondary path model has a significant impact on the stability and convergence of the adaptive control algorithm, so an accurate secondary path model is required. However, because it is difficult to remove the influence of dense frequency interference, the identification process is usually undertaken while the primary vibration source is turned off and the background noise is low. However, in actual engineering, the vibration transfer characteristics of the secondary path are time-varying, and there is a large difference between the model and the actual working state secondary path, resulting in poor adaptive control effect or even divergence. In order to solve this problem, this paper firstly proposes a method based on the second-order time-frequency filtering method to identify the real part and imaginary part of the frequency response function of the secondary path with low computational complexity and high precision. Then, the fluctuation characteristics of real-time identification of real and imaginary parameters in the presence of dense frequency interference are analyzed. Finally, a real-time secondary path identification method against dense frequency interference is proposed, which removes the fluctuation of identification parameters caused by dense frequency interference, and obtains stable and high-precision real-time secondary path identification results. Through the research of this paper, a real-time secondary path identification method against dense frequency interference is provided, which can effectively improve the adaptive control performance of the vibration isolation device. This method not only has the advantages of high precision and low calculation amount, but also can adapt to the time-varying environment in actual engineering, and has high practical value and promotion prospect.
Key words
active-passive vibration isolation /
adaptive control /
real-time secondary path identification /
phase error, dense frequency interference
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