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机构地区:[1]南京理工大学
出 处:《中国机械工程》2006年第8期780-784,共5页China Mechanical Engineering
基 金:江苏省科学技术基金资助项目(BJ2000013);国防预研基金资助项目
摘 要:针对压电自感知执行器电学物理模型,分析了现有的提取结构振动信号方法存在的问题,改进了一维最小二乘均方自适应补偿系统的设计,提出了利用二维最小二乘均方自适应算法实现压电自感知执行器传感与激励信号间的动平衡分离,设计了基于TMS320LF2407DSP的二维最小二乘均方自适应信号分离系统,实现了对压电自感知执行器输出信号大小、相位的二维补偿,并从理论上进行了收敛性证明。实验结果证实,基于二维最小二乘均方自适应算法可真正实现压电自感知执行器传感与激励信号完全的、不失真的理想分离。This paper analysed the difficulties existing in picking--up structure vibration signals by using present ways after introducing the circuit physical models of piezoelectric self sensing actuators. The one--dimensional least mean square self--adaptive compensating system was further improved on piezoelectric self--sensing signal separation. A two--dimensional least mean square self-- adaptive algorithm was applied into the dynamic balance signal separation between piezoelectric self-- sensing actuators and excitation signals, which was proved theoretically. Based on the digital signal processing chip, the separation system can realize the magnitude and phase compensation of self-- sensing actuator output signals. The experimental results show that the two--dimensional least mean square self--adaptive algorithm can simultaneously separate the piezoelectric self--sensing actuator sensin^s and the excitation signals totally and distortion freely.
关 键 词:智能结构 压电 自感知执行器 二维最小二乘均方 自适应补偿
分 类 号:TP273[自动化与计算机技术—检测技术与自动化装置]
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