基于非稳态激励信号的控制回路非线性检测Nonlinearity Detection of Control Loops Based on Nonstationary Exciting Signal
陈小强,钟丹,谢磊,王德华,顾涤枫
CHEN Xiaoqiang,ZHONG Dan,XIE Lei,WANG Dehua,GU Difeng
摘要(Abstract)：
提出一种基于非稳态激励信号的控制回路非线性检测算法,设计了在固定频率上存在激励的非稳态激励信号,以估计输出信号中的非线性失真部分。通过引入局部多项式法消除傅里叶变换引起的频谱泄露误差,利用信号周期性消除输入、输出信号中的测量误差,采用最小二乘法计算待测过程的最优线性估计和非线性失真。仿真实验结果表明,该方法对过程中的非线性失真敏感度高,信号能量低,在计算效率方面具有明显优势。
A nonlinearity detection method based on nonstationary excitation signal is proposed, and nonstationary exciting signal on fixed frequency is designed to estimate nonlinearity distortion in the output signal.The local polynomial method is used to remove the spectrum leakage error caused by Fourier transform, and the signal period is used to eliminate measurement errors in input and output signals. Least squares method is employed to calculate optimum linearity estimation and nonlinearity distortions. The simulation experiment result shows that the method is highly sensitive to nonlinearity distortion and low in signal energy, and advantageous in calculation efficiency.
关键词(KeyWords)：
控制回路;非线性检测;非稳态
control loop;nonlinearity detection;nonstationary
基金项目(Foundation):
作者(Author):
陈小强,钟丹,谢磊,王德华,顾涤枫
CHEN Xiaoqiang,ZHONG Dan,XIE Lei,WANG Dehua,GU Difeng
DOI: 10.19585/j.zjdl.201908017
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