Performance Degradation Modeling and Continuous Lifetime Assessment of Ultrasonic Vibration Systems

The evaluation of performance stability is crucial to ensure the effective operation of ultrasonic vibration system in practical application. To address the issue of assessing the duration of continuous stable operation for ultrasonic vibration systems, based on the analysis of the failure mechanism of the ultrasonic vibration system, resonance frequency drift and amplitude attenuation are selects as two degradation features for the system. Accelerated degradation experiments are conducted under various force load levels. Based on experimental data and degradation, distribution, and acceleration models, a degradation model for the ultrasonic vibration system is established. The Copula function is introduced as the connection function for the two degradation features, and reliability functions are used to depict the lifetime curves under both single and combined degradation effects. By means of analyzing the lifetime curves, it is determined that amplitude attenuation is the primary characteristic influencing the system’s lifetime. The predicted continuous and stable operation time for the developed ultrasonic vibration system is 26.69 h. The proposed method for evaluating the stability of ultrasonic vibration systems and the degradation model for their operational performance can provide valuable references for the evaluation, maintenance, and design of ultrasonic vibration systems.