电阻应变数据采集系统传递函数的评价

Evaluation of Transfer Function of Resistance Strain Data Acquisition System

提出了电阻应变数据采集系统传递函数的一种辨识方法,给出了详细技术过程,包括:电阻应变阶跃激励源的构建与赋值,电阻应变阶跃信号波形的获取,应变放大器恒定时间延迟的测量估计,用等效采样方式获取电阻应变数据采集系统的阶跃响应序列,激励序列和响应序列的时序统一与合成,用一种特殊白化滤波器的最小二乘法进行电阻应变数据采集系统传递函数辨识等。在一组实验中的传递函数辨识应用,证明了该方法的有效性及可行性。该方法可用于电阻应变数据采集系统动态特性的计量校准,及其传递函数辨识。

An identification method for the transfer function of the resistance strain data acquisition system is proposed. The detailed technical process is given,including the construction and assignment of the resistance strain step excitation source,the acquisition of the resistance strain step signal waveform,the measurement and the estimation of the constant time delay of the strain amplifier,the step response sequence of the resistance strain data acquisition system is obtained by equivalent sampling method,the timing sequence of the excitation sequence and the response sequence is unified and synthesized,and the transfer function of the resistance strain data acquisition system is performed by the least square method with a special whitening filter. The transfer function identification application in a set of experiments demonstrates the effectiveness and feasibility of the method described. The method can be used for the calibration of the dynamic characteristics of the resistance strain data acquisition system and its transfer function identification.