弯曲圆柱换能器振动特性实验研究  

Experimental Study on the Vibration Characteristics of a Curved Cylindrical Transducer

作　　者：许欣然[1] 周利生[1] 郑震宇[1] 解广亚 XU Xinran;ZHOU Lisheng;ZHENG Zhenyu;XIE Guangya(Key Laboratory of Sonar Science and Technology,Hangzhou Applied Acoustics Research Institute,Hangzhou 310023,China)

机构地区：[1]杭州应用声学研究所声纳技术重点实验室,杭州310023

出　　处：《噪声与振动控制》2018年第6期37-41,共5页Noise and Vibration Control

摘　　要：弯曲圆柱换能器是一种典型的低频、大功率、小尺寸水下声源。分析表明,其振动和声学性能与驱动元件的预应力工况和端盖的边界条件密切相关。尽管可以利用仿真分析得到相关规律,但受限于问题的非线性和材料参数的不稳定性,很难对实际的工况进行准确模拟。利用激光测振法对弯曲圆柱换能器在不同条件下的振动特性进行测量分析,并对其预应力工况和端盖边界条件进行了优化。实验研究表明,不同预应力工况对换能器振动输出的线性度和效率有较大影响,而端盖约束边界条件会改变换能器的模态振型和谐振频率。同时,激光测振法为一般换能器最终声学性能的准确优化提供了一种高效的实现方法。Curved cylindrical transducer is a kind of typical low frequency, high voltage and compact underwater sound sources. Analysis indicates that its vibration and acoustical performances are closely related to the pre-stress status of the driving elements and the boundary condition of the end caps. Simulation can be used to study the relevant laws, but is limited by the nonlinearity of the problem and the instability of the material parameters. Therefore, the actual conditions of the transducers can hardly be modeled precisely. In this study, laser vibration measurement method is used to analyze the vibration performance of a curved cylindrical transducer under different conditions, and the pre-stress status and the end cap boundary condition are optimized. Experimental study indicates that the pre-stress status has a great impact on the linearity and efficiency of the vibration output. On the other hand, end cap restrictive boundary condition can also change the mode shape and resonant frequency of the transducer. The laser vibration measurement provides an efficient method for accurately optimizing the acoustical performance of the curved cylindrical transducers.

关 键 词：振动与波 弯曲圆柱换能器 激光多普勒测振 预应力分析 模态分析 

分 类 号：TB565[交通运输工程—水声工程]