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| 1 | 湍流边界层激励下腔体内水动力自噪声预报与测量显示文摘循环水槽中试验测量了腔体内水动力自噪声,并与模态法建立的湍流脉动压力引起腔体自噪声预报进行比较验证。透声窗振动以简支边界为条件,腔体内部声波以刚性边界为条件模态展开,通过辐射边界条件建立模态耦合振动方程。在随机湍流脉动压力作用下,推导了模态振动方程在随机力激励下的自噪声功率谱响应。对循环水槽中5 m/s和8 m/s两种流速工况下的腔体水动力自噪声和湍流脉动压力进行了测试,结合测量的脉动压力预报方法可以计算腔体水动力自噪声量值,理论预报与试验测量结果大致吻合,趋势一致,为声呐罩材料选取及声学环境控制提供了一种分析方法。 | 刘孝斌 吕世金 俞孟萨 | 2015 | 声学学报2015，40，6： | 7 |
| 2 | 弱耦合封闭声腔的声辐射模态理论与计算显示文摘有源结构声控制是耦合封闭声腔的声辐射控制的有效方法。在此前的研究中有学者提出了'耦合封闭声腔的声辐射模态'概念,但其在概念和应用上均存在不便之处:其定义实质上是结构模态幅值的一组基函数,这与自由空间内声辐射模态是结构表面法向振速或声压的一组基函数的物理意义并不一致;另一方面,在计算和利用其进行控制时仍然需要用到结构模态,而在实际中辐射结构有用的结构模态信息难以准确、方便地得到。为了解决这些问题,类比自由空间声辐射模态理论,将声势能直接表示为结构表面法向振速的二次型形式,提出了新的结构向耦合封闭声腔的声辐射模态计算方法,并从理论上证明了当耦合面均匀离散时,在一定的条件下,可以简单地利用声腔模态投影向量代替耦合封闭声腔的声辐射模态,从而有效地节约计算资源。通过理论研究,形成了与自由空间内相统一、便于应用的耦合封闭声腔声辐射模态理论,数值计算案例表明,所提出的理论方法可以极大方便耦合封闭声腔的声辐射计算及其有源结构声控制。 | 毛荣富 苏常伟 朱海潮 | 2019 | 声学学报2019，44，3： | 6 |
| 3 | 大负载超声振动磨削系统的设计显示文摘设计了一种大负载超声振动磨削系统,超声系统由换能器、圆柱圆锥形变幅杆和轮辐式砂轮组成。首先将轮辐式砂轮等效成轮毂为圆柱杆、辐板与轮缘为中厚板的复合模型,利用各接触面边界连续的条件推导系统的频率方程,完成了超声磨削系统的设计,制作了实验装置并分析验证了其声学振动特性。实验结果表明:利用轮辐式砂轮复合模型求解系统频率方程,在解决大负载超声振动磨削系统设计难题上的有效性。该超声系统结构简单,声学振动特性稳定,可输出均匀的位移振幅,有望在大负载的超声磨削领域获得应用。 | 李艳琴 赵波 向道辉 高国富 焦锋 王梦 雷小飞 | 2022 | 声学学报2022，47，1： | 0 |
| 4 | 基于声辐射模态的耦合封闭声腔有源结构声控制机理显示文摘利用声辐射模态进行有源结构声控制(ASAC)是一种全新有效的结构声控制方法。为此,结合结构模态和声模态,研究了基于声辐射模态的ASAC机理。研究结果表明:基于声辐射模态的ASAC机理在于大幅降低主导声辐射模态幅度;从结构模态的角度来看,板控模态频率下的结构模态幅度出现模态抑制,而腔控模态频率下则发生模态重组;从声模态角度来看,同时降低了与该阶主导声辐射模态耦合的一组声模态幅度,从而实现了声势能衰减和全局降噪。 | 张江平 王亚楠 姜涛 张光宇 | 2021 | 海军工程大学学报2021，33，3： | 0 |
| 5 | Theory and calculation for acoustic radiation mode of weak coupled enclosure显示文摘Active structural acoustic control(ASAC)is an efficient method in acoustic radiation control of coupled enclosure.In the past research of ASAC,the concept of 'acoustic radiation mode(ARM)of coupled enclosure'was proposed,which was a set of basis functions of structural mode amplitude.However,there was an incompatibility with the ARM definition in free space radiation case which was a set of basic functions of normal velocity or pressure on the vibrating surface.Also,there was severe inconvenience for application as structural modes were required while accurate and useful structural modes were difficult to be extracted in practice.To overcome these problems,by analogy to ARM theory of free space,the acoustic potential energy was expressed in quadratic form of normal velocity on coupling surface and ARM of coupled enclosure was redefined.Furthermore,theoretic derivation showed that ARM of coupled enclosure could be replaced simply by corresponding acoustic mode projection of enclosure when the coupling surface was discretized into equal size elements.Therefore,the ARM theory of coupled enclosure which was consistent with that of free space and convenient for application was formed.Finally,numerical calculation was performed and the results proved that the presented theory was very efficient in ARM calculation of coupled enclosure and ASAC. | MAO Rongfu SU Changwei ZHU Haichao | 2019 | Chinese Journal of Acoustics2019，38，3： | 0 |
| 6 | Prediction and test of cavity's hydrodynamic self-noise induced by turbulent boundary layer显示文摘The self-noise in cavity is tested in the circling tank,prediction method of cavity's self-noise induced by turbulent boundary layer is established.The window's vibration is using the simply supported boundary condition,the sound wave in the cavity is expanded using the rigid wall boundary condition,the modal coupling vibration equation between them is established using the radiation boundary condition.The turbulent boundary layer pulsating pressure is random,the self-noise power spectrum in the cavity is solved.Test of self-noise and turbulent pressure is carried out in the circling tank when the flow velocity is 5 m/s and 8 m/s,the result verifies that the theoretical method can predict the real cavity's hydrodynamic noise approximately,the trends are similar,this provides one analytical method for sonar dome's material selection and noise control. | LIU Xiaobin Lü Shijin YU Mengsa | 2016 | Chinese Journal of Acoustics2016，35，2： | 0 |
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