精确控制施加于驱动元件上的预应力 ,对换能器的设计及其工作过程都有重要意义 ,特别对于稀土磁致伸缩换能器来说 ,有助于发挥其最大潜能 .利用有限元方法 ,计算了VII型水声弯张换能器壳体给驱动元件施加一定预应力时 ,壳体所需的装配位移的大小 ,并通过实验作了验证 ;弯张换能器随入水深度的不同 ,驱动元件两端所受到的总的预应力是不同的 .利用有限元方法 ,计算了换能器入水深度与预应力的关系 .本文方法可适合于其他任何类型的换能器 Precise control of the prestress applied to the drive element is of great importance to the design of the transducer and its working process, especially for rare earth magnetostrictive transducers, which helps to maximize its potential.Using the finite element method , Calculated the type VII underwater acoustic bending transducer shell to the driving element when a certain prestress, the housing displacement required for the size of the assembly, and verified by experiments; bending transducer with the depth of the water into the different , The total prestressing force applied on the two ends of the driving element is different. The relationship between the infiltrated depth of the transducer and the prestressing force is calculated by finite element method. The proposed method can be applied to any other type of transducer