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采用有限元和边界元相结合的方法，计算分析了纵向式换能器在空气和水中的振动模态、谐振频率、导纳曲线及空间指向性。并与实际测试进行了比较。
The vibration modes, resonant frequencies, admittance curves and spatial directivity of longitudinal transducers in air and water are calculated and analyzed by the combination of finite element and boundary element method. And compared with the actual test.