弯曲圆盘换能器与镜像虚源的互辐射作用

建立了弯曲圆盘换能器镜像虚源等效模型,利用脉动球源互作用原理对弯曲圆盘与其镜像虚源的互辐射作用进行理论分析,给出了互辐射阻抗及系统谐振频率的数学表达。提出了虚源互作用的低频换能器设计思想,将刚性反射板引入弯曲圆盘换能器临近辐射面的声场中,通过理论分析、有限元模拟和样机实验研究了低频换能器谐振频率与主要结构参数之间的关系。结果表明,弯曲圆盘与镜像虚源间的互辐射作用可以有效降低换能器的谐振频率,当反射板直径与弯曲圆盘辐射面直径相当时,谐振频率可降低至其自身谐振频率的50%以下;当反射板直径为弯曲圆盘辐射面直径2倍时,谐振频率可降低至37%。 

Mutual radiation between a bender transducer and virtual image

The equivalent model of the virtual image source of a single bender transducer is established.Using the pulsating sphere source model,the theoretical analysis of mutual radiation effect between a bender and its virtual image is done at first,then the mathematical expressions of mutual radiation impedance and resonant frequency of the system are derived.The idea of low frequency transducer design with virtual source interaction is proposed,two rigid circle baffles are set into the sound field near the radiation surface of a bender transducer,and the relationship between the resonant frequency and the main structural parameters of the low-frequency transducer is studied through theoretical analysis,finite-element simulation and prototype experiment.The results show that the resonant frequency of the transducer can be effectively reduced by the mutual radiation effect between the bender and the virtual image source.Compared with the resonant frequency of the bender itself,the resonant frequency can be reduced to less than 50% when the diameter of the reflector plate is equivalent to the diameter of the radiation surface of the bender,while it can be reduced to 37%when the diameter of the reflector plate is doubled.