采用PZT传感器在钢管中激励并接收超声导波，研究导波在管道中传播时的反射、透射现象。
PZT transducers have been used to excite and receive ultrasonic guided waves in steel pipes. The reflect and transmission rules of guided waves are researched.
建立超声场中固态相变的能量作用模型，并解释实验现象。
The energy -interaction model of solid phase transformation in an ultrasonic field is established and the experimental phenomenon is explained.
自动清洗，解决超声波清洗难题，减少贴片抛料现象发生。
Auto clean, avoid cleaning troubles of ultrasonic cleaner, reduce rejection rate.
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