Impedance mismatch between an ultrasonic power supply and a transducer can degrade machining quality, reduce efficiency, and shorten tool life. To address this, a detection method based on Voltage Standing Wave Ratio (VSWR) is proposed to evaluate power transfer efficiency. A fitting model is established between forward/reflected voltages and power to calculate VSWR, and a correlation model is built between VSWR and tool tip amplitude to define an optimal matching range. Experiments under variable conditions validate the method's accuracy, with deviations within 5% of theoretical values. Compared to traditional phase-based methods, the proposed approach reduces circuit complexity and detection cost, offering a practical and efficient solution for real-time impedance matching evaluation in ultrasonic machining systems.
Ye et al. (Wed,) studied this question.