步长参数对电液伺服振动台加速度谐波抑制的影响
首发时间:2010-01-07
摘要:电液伺服振动台非线性现象的存在,导致系统作正弦振动时,其加速度响应信号中出现高次谐波,使加速度波形失真。基于自适应陷波技术,利用LMS自适应滤波算法,提出了自适应谐波抑制算法。从谐波抑制试验结果上看,自适应滤波器的步长参数对谐波抑制算法的收敛速率影响较大。从LMS自适应滤波算法本身出发,分析了导致这种影响的原因。
关键词: 电液伺服振动台 谐波失真 谐波抑制 LMS自适应滤波算法 收敛速率
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Impact of Step Size Upon Acceleration Harmonic Cancellation of Electro-hydraulic Servo Shaking Table
Abstract:Since nonlinear characteristics occur in electro-hydraulic servo shaking table, the acceleration output of the system corresponding to a sinusoidal input contains higher harmonics, which causes harmonic distortion of the output acceleration signal. Using LMS adaptive filtering algorithm, adaptive harmonic cancellation is developed. The reference signals are filtered by an adaptive filter to achieve the harmonic cancellation signal, which is added to the system input, thus cancel the harmonic in the acceleration response. From the results of harmonic cancellation tests, the step size of adaptive filter has a great effect on the convergence rate of harmonic cancellation. From the point view of LMS adaptive filtering algorithm, the reason of the impaction is analyzed.
Keywords: electro-hydraulic servo shaking table harmonic distortion harmonic cancellation LMS adaptive filtering algorithm convergence rate
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