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| 功能梯度圆柱壳-内声场耦合系统振声预测 |
| Vibro-acoustic prediction of functionally graded cylindrical shell coupled with internal acoustic field |
| 投稿时间：2021-11-02 修订日期：2021-12-20 |
| DOI： |
| 中文关键词: FGM圆柱壳 结构-声耦合 正交多项式 振声特性 |
| 英文关键词:FGM cylindrical shell structure-acoustic coupling orthogonal polynomial vibro-acoustic characteristics |
| 基金项目:国家自然科学基金；中南大学中央高校基本科研业务费专项资金资助项目；湖南省研究生科研创新项目, |
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| 中文摘要: |
| 针对功能梯度(FGM)圆柱壳与其内声场的振声特性分析需求，采用特征正交-里兹法研究圆柱壳厚度、材料梯度指数、边界支撑刚度、简谐力位置等因素对振声系统的影响。圆柱壳的位移及内部声压变量通过特征正交多项式与周向傅里叶谐波函数构建，并以声压做功的方式考虑结构与声场之间耦合条件，进而结合里兹法得到耦合系统的振声模态和稳态响应。研究表明，由该模型所得到的数值解与文献及有限元结果具有较好的一致性。对参数的研究发现，壳体厚度、梯度指数、边界刚度、激励位置等对振声系统的耦合特性均有较为明显影响，这为该类结构的低噪声设计及其内部声场优化提供了有益的参考。 |
| 英文摘要: |
| To satisfy response to the requirements for the vibro-acoustic analysis of the functionally graded(FGM) cylindrical shell and its internal sound field, the characteristic orthogonal-Ritz method is employed to investigate the influence of some factors, such as shell’s thickness, the material gradient index, the stiffness of the boundary support, and the position of the harmonic force on the vibro-acoustic system. The displacement components of the cylindrical shell and its internal sound pressure variable are constructed by the characteristic orthogonal polynomials and the circumferential Fourier harmonic functions, when the coupling conditions between the structure and the sound field are considered by means of the work done by sound pressure. And then, the Ritz method is combined to obtain the vibro-acoustic modal and steady-state response of the coupled system. Research shows that the numerical solution obtained by the current model is in good agreement with the results of literature and finite element. Parametric studies reveal that shell’s thickness, gradient index, boundary stiffness, and excitation position play significant effects on the coupling characteristics of the vibro-acoustic system, which provides a useful reference for the low-noise design of this type of structure as well as optimization of its internal sound field. |
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