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依据Ⅳ型弯张换能器壳体尺寸远小于波长的特点,利用体积位移相等的原理,将无障板的溢流式Ⅳ型弯张换能器等效为摆动球,将空气背衬式Ⅳ型弯张换能器等效为脉动球。利用等效球模型计算了这两种换能器的辐射阻抗值并与有限元计算值相比较,结果显示这两种计算结果比较一致。这两种换能器性能差异主要是由辐射阻抗不同所引起的。
According to the characteristics of type Ⅳ bend transducer shell is much smaller than the wavelength, using the principle of equal volume displacement, the barrier-free overflow type Ⅳ bending transducer is equivalent to the swing ball, the air backing type Type IV bending transducer is equivalent to a pulsating ball. Equivalent spherical model was used to calculate the radiation impedance values of the two transducers and compared with the calculated values of the finite element method. The results show that the two calculated results are consistent. The difference between the performance of these two transducers is mainly caused by the different radiation impedances.