弯张换能器装配预应力及入水后的变化

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. 关键词： 弯张换能器 装配位移 预应力 入水深度

Assembly prestress and its variation in different water depths when applied to the active elements of a flextensional transducer

It is very important for underwater flextensional transducers to accurately control the prestress applied to the active element in assembling and working process, especially, for the rare-earth magnetostrictive flextensional transducer, to be investigated clearly the relationship between the working in different water depths and the compressive prestress applied to the active element,which will be conducive to employ the active element potential energy. On coordination with the author's research project, the assembly displacement of an underwater flextensional transducer, by which is applied prestress to the active element, is calculated with the finite element method, and an elementary experiment is performed with a class VII flextensional transducer. The magnitudes of compressive prestress is variable when working in different water depths, the relationship is calculated by using finite element method(FEM). The method used in this paper may be generalized to other kinds of flextensional transducer.