针对双层隔振系统振动控制过程中参考信号不稳定的问题，设计了一种基于反馈理论的参考信号重建FXNLMS算法，在多种工况下进行振动主动控制实验。搭建双层隔振主动控制实验平台，采用最小均方算法建立误差通道的FIR滤波器数据通道模型；分析经典FXLMS控制算法，通过获取输出与误差信号对参考信号进行重建，采用归一化方法实时调整步长因子。单频和多频情况下进行仿真分析，结果表明重建信号与实际信号具有很高的重合度，控制系统具有良好的控制效果。实验结果表明，参考信号重建算法比FXLMS算法具有更好的稳定性和抗干扰能力，且不同条件下激励频率处振动衰减量可达15~30 dB。
Abstract
Aiming at the problem of reference signal instability in the vibration control process of two-stage vibration isolation system, a feedback theory-based reference signal reconstruction FXNLMS algorithm is designed to conduct vibration active control experiments under various working conditions. A two-stage vibration isolation active control experimental platform is built, and the FIR filter data channel model of the error channel is established using the least mean square algorithm; the classical FXLMS control algorithm is analyzed, and the reference signal is reconstructed by obtaining the output and error signals, and the step factor is adjusted in real time using the normalization method. Simulation analysis is carried out in single-frequency and multi-frequency cases, and the results show that the reconstructed signal has a high overlap with the actual signal and the control system has a good control effect. The experimental results show that the reference signal reconstruction algorithm has better stability and anti-interference capability than the FXLMS algorithm, and the vibration attenuation at the excitation frequency under different conditions can reach 15~30 dB.
关键词
主动控制 /
双层隔振系统 /
参考信号重建 /
FXLMS算法 /
误差通道建模
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Key words
active control /
two-stage vibration isolation system /
reference signal reconstruction /
FXLMS algorithm /
secondary channel modeling
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