摘要
针对在实际工程研究领域中经常要对SISO系统进行系统辨识的问题,开发一套基于Lab VIEW的SISO系统传递函数阶数与参数估计虚拟仪器。该虚拟仪器使用基本定义法与联合输入输出法两种传递函数参数估计方法进行相互比对,从而得到SISO系统的S域传递函数数学表达式的参数。通过对一个典型RLC二阶电路系统对该虚拟仪器进行理论分析与实验验证。由高频状态下的误差分析证明两种算法的结合部分在高频区间会增大误差。最终证明,这套系统传递函数阶数与参数估计虚拟仪器所辨识得到的系统模型参数在低频状态下具有较高的准确性。
In order to solve the problem of identification of SIS0 system, a virtual instrument system based on LabVIEW was developed. By using two different methods named basic definition method to identify and joint input-output method to estimate transfer function, this virtual instrument can get the order of the system and the parameters of the transfer function in s- domain. Based on a typical RLC second order circuit system theoretical analysis and experimental verification, this virtual instrument was shown to have high accuracy in identification of SIS0 systems in the low frequency range. The error analysis of the high-frequency state proves that the combination of the two algorithms will increase the error in the high-frequency range.
出处
《中国测试》
北大核心
2017年第6期103-107,共5页
China Measurement & Test
基金
国家自然科学基金(51305409)
山西省青年科技研究基金(2013021020-2)
关键词
传递函数
系统辨识
联合输入输出法
信号分析
RLC二阶电路
transfer function
system identification
joint input -output method
signal analysis
RLC second order circuit
