这种不稳定性的机制是基于声波在其同心圆半径和冲击之间的循环。
The mechanism of this instability is based on the cycle of acoustic waves between their corotation radius and the shock.
分析压电式超声波换能器的等效电路，并由等效电路输入阻抗的导纳圆图确定了换能器的元器件参数以及谐振频率、机械品质因数和工作带宽等特征参量。
The device parameter as well as resonance frequency, mechanical quality factor and work band width were determined by the equivalent circuit input impedance admittance circle diagram.
铝管精密成型技术，使超声波焊接的铝管尺寸精确、圆度好。
Aluminum pipe precise forming technology makes the ultrasonic welded Aluminum pipe size precise and roundness good.
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