超磁致伸缩执行器位移测试系统的误差分析

超磁致伸缩执行器位移测试系统是其性能研究的基础。为提高测试数据的准确性,以常用超磁致伸缩执行器位移测试系统为基础,给出了测试系统的误差来源,建立了温升、电源、测量、采集等因素的误差模型以及多因素影响下的误差合成模型。实验与计算结果表明:所设计超磁致伸缩执行器在输出位移为18μm时,位移采集、超磁致伸缩执行器驱动与温升造成的相对误差分别为0.56%、2.83%、3.28%,各因素合成后的相对误差为4.37%。

Error Analysis for Displacement Measuring System of Giant Magnetostrictive Actuator

The displacement measuring system of giant magnetostrictive actuator is the basis of the study on its performance.In order to improve the accuracy of the test data,after building a displacement measuring system,the error models caused by the temperature changing,driver,displacement measuring system and acquisition subsystem were derived.The error synthesis model under these factors effect was given.The results of experiment and simulation show that when the displacement of giant magnetostrictive actuator is 18 μm,the relative errors of displacement acquisition subsystem,the subsystem used for driving actuator and the temperature changing is 0.56%,2.83%,3.28%,and the relative error of displacement measuring system is 4.37%.