高速倾斜镜建模与传递函数辨识  

Modeling and transfer function identification of FSM system

作　　者：时晶晶[1] 姚佰栋[2] 鲁加国[2] 

机构地区：[1]安徽大学计算智能与信号处理教育部重点实验室,安徽合肥230601 [2]中国电子科技集团第38研究所,安徽合肥230088

出　　处：《红外与激光工程》2013年第10期2748-2752,共5页Infrared and Laser Engineering

基　　金：安徽大学研究生学术创新研究项目(01001770-10117700471)

摘　　要：为了在光束稳定控制系统中更好地对高速倾斜镜(FSM)实现稳定、精确地控制,对于由超磁致伸缩材料(GMM)作为位移产生元件的高速倾斜镜,根据GMM材料的特性和倾斜镜的运动机理,经推导建立了倾斜镜的传递函数模型,并结合实测的倾斜镜幅频和相频响应特性,在Matlab软件中利用Levy法对倾斜镜的传递函数进行了辨识,得到了精确的倾斜镜传递函数。与实测结果相比,在中低频段,幅度辨识误差在0.3 dB以内,相位辨识误差在5°以内,结果表明:通过理论推导建立的倾斜镜模型是合理有效的,对于改善该倾斜镜在应用系统中的稳定性和精度提供了依据。The fast steering mirror （FSM） was widely used in beam stabilization controlling systems. In order to ensure the FSM work more stably and precisely, the transfer function model of the FSM was deduced using giant magnetostrictive material as the displacement generator based on the material’s physical properties and the dynamic characteristics of the FSM. With the actual measured result of the FSM’s amplitude frequency response characteristics and phase frequency response characteristics, the accurate transfer function of the FSM was identified using the levy identification algorithm in the matlab software. Compared with the actual measured result, we concluded that the error of the transfer function obtained by identification is under 0.5 dB in magnitude and 5o in phase in the low and intermediate frequency range. The result shows that the transfer function model deduced is reasonable and supplied theoretic reference of how to improve FSM’s performance in its application system.

关 键 词：高速倾斜镜 建模 传递函数辨识 Levy辨识算法 

分 类 号：V566[航空宇航科学技术]