摘要
为解决激波管系统误差对压力传感器动态标定存在影响,致使动标结果不准确的问题,采用EMD(Empirical Mode Decomposition)方法分解了压力传感器利用激波管进行动标的数据,对各个分量进行频谱分析,提出了去除激波管系统误差的信号重构模型.分析了多支不同传感器相同IMF(Intrinsic Mode Function)分量的相关性,得到相关系数,确立了相关系数与重构模型中配比因子的关系,进而求得了重构模型中IMF的配比因子.通过对激波管系统误差的识别和去除,得到压力传感器阶跃响应的重构信号.通过与原信号进行对比,结果表明:传感器的固有频率、上升时间和平台的稳定性更符合实际.基于EMD分解的激波管系统误差识别与消除方法可用并效果明显.
To solve the problem that the system error of shock tube has influence on dynamic calibration of pressure sensor,causing the result inaccurate,Empirical Mode Decomposition（EMD）method is used to decompose the pressure sensor data of dynamic calibration with shock tube.The frequency spectrums of different components are analyzed and the reconstruction signal model is set up to get rid of the system error.The corresponding Intrinsic Mode Functions（IMFs）of the decomposition results from a number of different sensors are analyzed,the correlation coefficients are calculated,and the relationship between the correlation coefficients and the matching factors of the IMFs in the reconstruction model is established.The reconstruction signal of the step response of pressure sensor is got by distinguishing and eliminating the system error of shock tube.Compared with the original signal,the results show that the natural frequency,rising time and platform duration time of the sensor are more accurate.The method of distinguishing and eliminating the system error of shock tube based on the EMD decomposition is useful and effective.
作者
马泽
张志杰
MA Ze;ZHANG Zhijie(School of Instrument and Electronics, North University of China, Taiyuan 030051, China;Key Laboratory for Instrumentation Science＆Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China)
出处
《测试技术学报》
2018年第3期243-249,共7页
Journal of Test and Measurement Technology
关键词
EMD
激波管
系统误差
动态特性
EMD
shock tube
system error
dynamic characteristics
