Research on Acoustic Time Difference Feedback Method Caused by Changes in Couplant Thickness in Precision Stress Measurement

Precision stress measurement is crucial for the safe operation of high-end rotary equipment. The effective feedback of the acoustic time difference caused by changes in the couplant thickness is a prerequisite for precise stress measurement. This study analyzed the variation of critical refracted longitudinal wave (LCR wave) acoustic time difference with the couplant thickness. An acoustic time difference monitoring scheme was proposed by adding a feedback transducer between the transmitting and receiving transducers. This study provides an important reference for improving the measurement accuracy of high-end rotary equipment stress.