水下圆柱壳声辐射有源力控制及机理分析  

Active structural acoustic control of a submerged finite cylindrical shell and its physical mechanism

作　　者：丁少虎[1] 陈克安[1] 马玺越[1] 玉昊昕[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《振动工程学报》2014年第4期547-554,共8页Journal of Vibration Engineering

基　　金：航空科学基金资助项目(2011ZA53004)

摘　　要：研究了利用力激励进行水下有限长圆柱壳振动声辐射有源控制问题。考虑流固声振耦合作用,根据圆柱壳辐射声功率在周向相互解耦的特性,推导了次级力源最优强度解析表达式,比较了单个力和多个力有源控制后的降噪效果;利用圆柱壳结构振动模态和声辐射模态的对应关系,分析了圆柱壳声辐射有源力控制的物理机理。研究结果表明:多个次级力更能有效地控制壳体产生声辐射的振动部分而达到控制噪声的目的;水下圆柱壳的前几阶声辐射模态的辐射效率很高,而辐射模态幅度较低,有源控制机理在于降低与结构振动模态对应的声辐射模态幅度,从而有效控制结构振动产生的声辐射。The active structural acoustic control of a submerged finite cylindrical shell is investigated. Firstly, considering fluidstructure coupling interaction, the analytic expression of the optimal complex intensity of secondary force is derived according to uncoupled characteristic of the sound power radiated from the finite cylindrical shell in the circumferential direction. Secondly, the control effects with single control force and two control forces are compared. Lastly, the physical mechanism of active structural acoustic control of the submerged finite cylindrical shell is analyzed based on the relation of structural vibration mode and acoustic radiation mode. The results show that the more reduction is obtained using multiple secondary forces by control the vibration of the shell which effectively produces the sound radiation; The radiation efficiency of the first several order radiation mode is very high, but with lower mode amplitude, the physical mechanism of active control is to reduce the amplitude of acoustic radiation modes corresponding to structure vibration modes, thus effectively control the sound radiated from structural vibration.

关 键 词：噪声 有源控制 水下圆柱壳 声辐射模态 振动模态 

分 类 号：TB535[理学—物理] O422.6[理学—声学]