A new method for high precsion instantaneous speedmeasurement of hydraulic system  

液压系统高精度瞬时转速测量新方法（英文）

作　　者：LIU Jia-min GU Li-chen SUN Yu 刘佳敏;谷立臣;孙昱(西安建筑科技大学机电工程学院)

机构地区：[1]School of Mechatronic Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China

出　　处：《Journal of Measurement Science and Instrumentation》2019年第4期307-314,共8页测试科学与仪器（英文版）

基　　金：National Natural Science Foundation of China(No.51275375);Scientific Research Program Project of Shaanxi Provincial Education Department(No.19JK0464)

摘　　要：The instantaneous speed of a hydraulic system contains a wealth of operational information,and its accurate extraction is the basis for condition monitoring and fault diagnosis.In order to solve the problem of high hardware requirement for instantaneous speed measurement based on data acquisition card,a new method of high precision measurement is proposed.In this method,the time-displacement information of each tooth is obtained from the pulsed square wave signal of the gear disk collected by magnetoelectric sensors.The time-displacement curve is interpolated by the cubic spline interpolation method,and then the instantaneous speed is calculated by the five-point digital differential formula.The experimental results show that the method improves the speed measurement resolution and reduces the quantization error.The high precision instantaneous speed signal can also be acquired by hardware devices with less teeth and low sampling frequency.The related research results provide a theoretical basis and a method for improving the accuracy of instantaneous speed measurement.

关 键 词：instantaneous speed measurement variable speed hydraulic system cubic spline interpolation five-point digital differentiation 

分 类 号：TP271.31[自动化与计算机技术—检测技术与自动化装置]