Ultrasonic reflection provides a real-time way to monitor oil film thickness in a running machine with a nondestructive advantage.However,the influence mechanism of temperature on reference signals has not been clarif...Ultrasonic reflection provides a real-time way to monitor oil film thickness in a running machine with a nondestructive advantage.However,the influence mechanism of temperature on reference signals has not been clarified thus far,which hinders the precise measurement of oil film thickness.Focusing on a common three-layer structure of sensor-adhesive-steel,a global propagation model is constructed to investigate variations in the reference signal with temperature.Through finite element simulations,distinct influence mechanisms are revealed for different components.For piezoelectric sensors and the adhesive layer,temperature may induce amplitude attenuation and wave extensions in the reference signal.In the steel component,only an overall time shift is observed in the reference signal.Subsequently,a compensation model is established and validated through temperature-controlled experiments.Within the effective bandwidth,the compensation model achieves a relative error of±2%and an absolute error of±0.02 radians for the amplitude and phase of the reference waves.展开更多
基金support from the National Natural Science Foundation of China(Nos.52405597,52275126,and 52105159)the Natural Science Basis Research Plan in Shaanxi Province of China(No.2024JCYBQN-0577).
文摘Ultrasonic reflection provides a real-time way to monitor oil film thickness in a running machine with a nondestructive advantage.However,the influence mechanism of temperature on reference signals has not been clarified thus far,which hinders the precise measurement of oil film thickness.Focusing on a common three-layer structure of sensor-adhesive-steel,a global propagation model is constructed to investigate variations in the reference signal with temperature.Through finite element simulations,distinct influence mechanisms are revealed for different components.For piezoelectric sensors and the adhesive layer,temperature may induce amplitude attenuation and wave extensions in the reference signal.In the steel component,only an overall time shift is observed in the reference signal.Subsequently,a compensation model is established and validated through temperature-controlled experiments.Within the effective bandwidth,the compensation model achieves a relative error of±2%and an absolute error of±0.02 radians for the amplitude and phase of the reference waves.
