基于DTC-LS的加速度计动态模型参数辨识  

Dynamic model parameter identification of accelerometer using delay time correction and least square

作　　者：魏青轩[1] 王建林[1] 付雪松 孙桥[2] 胡红波[2] 

机构地区：[1]北京化工大学信息科学与技术学院,北京100029 [2]中国计量科学研究院,北京100013

出　　处：《仪器仪表学报》2017年第12期2924-2932,共9页Chinese Journal of Scientific Instrument

基　　金：国家重大科学仪器设备开发专项(2012YQ090208)资助

摘　　要：加速度计动态模型对描述和分析其动态特性具有重要作用。针对加速度计绝对法冲击激励校准中未知延迟时间对加速度计动态模型参数辨识精度的影响,提出了一种基于延迟时间修正(DTC)和最小二乘(LS)的加速度计动态模型参数辨识方法,该方法将延迟环节引入加速度计动态模型中,使用加速度计冲击激励与响应数据的傅里叶变换估计频率响应函数,采用LS方法和极小化相位误差准则函数迭代修正延迟时间,并利用延迟时间修正后的加速度计冲击激励与响应数据,辨识加速度计动态模型参数。仿真实验和加速度计绝对法冲击激励校准实验表明,该方法能够有效地消除延迟时间对加速度计动态模型参数辨识的影响,辨识获得的加速度计动态模型参数具有较高精度。The accelerometer＇ s dynamic model plays an important role in describing and analyzing its dynamic characteristics. For the influence of unknown delay time on the accuracy of aceelerometer＇ s dynamic model parameters identification using the calibration upon shock excitation, a dynamic model parameter identification method of aceelerometer using delay time correction （DTC） and least square （LS） is presented. In this method, the delay time is firstly introduced into the dynamic model of accelerometer, and the frequency response function is estimated by using Fourier transform of the accelerometer＇ s shock excitation and response data. Then, the LS method and minimizing the error criterion function of phase are utilized to correct the delay time through continuous iteration. Finally, the dynamic model parameters of accelerometer are estimated, based on the delay time corrected data which consists of shock excitation and response of aceelerometer. The experimental results of simulation and the calibration upon the shock excitation show that the presented method can reduce the influence of the delay time effectively on the accuracy of accelerometer＇ s dynamic parameters identification, and the dynamic model parameters of accderometer can be obtained with higher accuracy.

关 键 词：加速度计 动态模型 参数辨识 延迟时间 最小二乘 

分 类 号：TH824[机械工程—仪器科学与技术]