简要分析了当前复合地基动测技术的不足，提出了用单桩复合地基上块体的竖向振动速度导纳曲线检测桩—土体系工程性状的机械导纳法。
The conventional dynamic tests of composite foundation were reviewed and the velocity or (mechanical) admittance method for a block on single-piled composite foundation was recommended.
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.
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