Research on Ultrasonic Measurement of Flange Bolt Tightening Force
Aiming at the problem that it is difficult to measure and control the tightening force of flange bolts in the installation process,the ultrasonic measurement model of flange bolts was established,and the ultrasonic measurement system of flange bolt tightening force was designed.Based on FPGA and Ethernet technology,the periodic pulse excitation,data acquisition,high-speed communication transmission and signal processing modules were designed to realize the transmission and reception of ultra-sonic signals.The threshold method and extremum method were combined to improve the measurement accuracy of ultrasonic transit time.Then the bolt fastening force was calculated according to the ultrasonic measurement model of flange bolt.The bolt calibration experiment shows that the ultrasonic model of flange is reliable and the repeatability accuracy of calibration coeffi-cient reaches±2.4%;The comparative test between ultrasonic method and strain gauge method shows that the designed test sys-tem can realize the measurement of bolt tightening force,whose relative error with strain gauge method is less than 5%.
Flange BoltTightening ForceUltrasonicTime of FlightExtremum Method
万方数据
维普
