Resonant response of complex shell structures
Resonant response of complex shell structures
复制标题
DOI：
10.1121/1.1286515
复制
发表时间：
2000-08
期刊：
影响因子：
--
通讯作者：
D. Photiadis;B. Houston;Earl G. Williams;J. Bucaro
中科院分区：
文献类型：
--
作者：
D. Photiadis;B. Houston;Earl G. Williams;J. Bucaro
壳体结构的共振是决定其声学特性的重要因素。这些特性中最重要的是辐射噪声、散射和自噪声水平。结构共振的性质，例如特定频带内的模式数量或响应的总体空间相关性，决定了这些现象在各种情况下的重要性，以及可以采取什么步骤来改变其声学影响。在过去，关于高度理想化系统的共振响应的知识被用来指导安静平台的开发。本文报道了一个缩尺模型的结果，该模型研究了复杂程度的增加对潜壳结构共振性质的影响。本文介绍了弯曲Bloch模共振、结构不规则性引起的局域共振以及非轴对称对这些现象的影响。讨论了这些结果对声学设计和系统开发的影响。
Resonances of shell structures play a prominent role in determining their acoustic characteristics. Among the most important of such characteristics are radiated noise, scattering, and self-noise levels. The nature of the structural resonances, for example the number of modes within a particular frequency band or the overall spatial dependence of the response, determines the importance of these phenomena in various contexts and what steps may be taken to modify their acoustic impact. In the past, knowledge of the resonant response of highly idealized systems has been used to guide the development of quiet platforms. The results of a scale model investigation of the effects of increased complexity on the nature of the resonances of submerged shell structures are reported. Effects presented here are flexural Bloch mode resonances, localized resonances resulting from structural irregularity, and the effects of non-axisymmetry on these phenomena. The implications of these results on acoustic design and the development of systems is discussed.