Method for measuring bolt pre-tightening force based on different modal echo signals

• Main Authors: YAN GUANGLONG, ZHU ZHONGYIN, CHEN BING, GOU GUOQING, ZHANG CHENHAO, QIU FEIFEI, QIN SHUZHI, LIU HENG, GUO MUCHENG
• Format: Patent
• Language: Chinese; English
• Published: 25.11.2022
• Subjects: MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; PHYSICS; TESTING

The invention discloses a method for measuring bolt pretightening force based on different modal echo signals. The method comprises the following steps: S1, selecting a reference bolt for a calibration experiment; s2, performing a pre-tightening force calibration experiment on the reference bolt to obtain the ratio of the transition time of the A mode to the transition time of the B mode in the ultrasonic echo signals of the reference bolt under different pre-tightening forces; s3, obtaining a function relationship between the bolt pre-tightening force and the ratio of the transition time of the A mode to the transition time of the B mode through linear fitting; s4, performing ultrasonic pre-tightening force measurement on the to-be-measured bolt to obtain the ratio of the transition time of the A mode to the transition time of the B mode in the ultrasonic echo signal of the to-be-measured bolt; and S5, calculating the pre-tightening force of the to-be-measured bolt according to the function relationship betw