基于频域的挠性摆式加速度计表头参数辨识方法  

Parameter identification method based on frequency domain of flexure hinged pendulum accelerometer

作　　者：闵跃军 薛旭[1] 

机构地区：[1]北京航天控制仪器研究所,北京100854

出　　处：《中国惯性技术学报》2008年第1期94-98,103,共6页Journal of Chinese Inertial Technology

基　　金：国防科技预研项目(51309020101)

摘　　要：鉴于挠性摆式加速度计表头频率特性的传统振动台测试方法存在低频和高频段的动态误差较大的缺点,给出了系统开路和闭合两种状态的电激励测试方法;在此基础上,针对挠性摆式加速度计表头参数的理论计算值和实际工作状态有一定的误差,研究并提出了基于频域的Levy法和山下法的表头参数辨识方法,并运用Householder变换解决了辨识过程中的病态问题。实验和辨识结果表明,电激励测试的方法更便于实验和在线动态测试,而且这种通过利用实测的频率特性来反推辨识表头参数的方法,有着很高的辨识精度和工程实用价值。There was large dynamic error in the range of low and high frequencies by using the vibration table. In view of this shortcoming, the testing methods for electric stimulation under open-loop and closed-loop conditions were given, which were easy for experiment and online dynamic testing. Based on this, the method of frequency domain identification of FHPA by using Sanathanan method and Levy method was presented since there were errors existed between the real working parameter and the calculated value of flexure hinged pendulum accelerometer （FHPA）.. Ill-conditioned problem was solved by using the Householder transformation. The experiment and identification results indicate that the method of parameter identification based on frequency domain has the advantages of high precision and practical engineering value.

关 键 词：挠性摆式加速度计 频域辨识 电激励测试 Levy法 Householder变换 

分 类 号：U666.1[交通运输工程—船舶及航道工程]