多种边界条件下自旋圆柱壳振动特性研究
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O321;TH113.1

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国家自然科学基金资助项目(12102175);中央高校基本科研业务费专项资金资助项目(B240201128)


Vibration characteristics of spinning cylindrical shells under various boundary conditions
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    摘要:

    自旋圆柱壳作为实际工程结构中的重要部件,其壳体端部边界条件复杂多样,对部件的振动特性有着重要影 响。为研究多种边界条件下自旋圆柱壳的振动特性,基于 Lagrange 方程和 Novozhilov 壳体理论建立自旋圆柱壳的 结构动力学模型;根据圆柱壳边界条件的数学描述,采用 Chebyshev 多项式构建满足边界条件且与壳体结构参数无 关的位移场离散函数;通过求解与振动特性相关的特征方程得到静止圆柱壳的固有频率和模态,分析壳体转动惯性 对固有频率的影响,讨论壳体理论在不同壳体几何尺寸下的适用性;此外,发现了环向波数相关的模态函数,并将其 用于圆柱壳零阶环向模态固有频率的求解及多种边界条件下自旋圆柱壳行波固有频率的求解,讨论了自旋圆柱壳 行波固有频率随结构参数变化的情况。

    Abstract:

    Spinning cylindrical shells are critical components in practical engineering structures. The boundary conditions at the shell ends are diverse and significantly influence the vibration characteristics of the shell. To study these characteristics under vari? ous boundary conditions, a dynamic model of the spinning cylindrical shell is established using Lagrange equations and Novozhilov’s shell theory. The mathematical description of the boundary conditions for the cylindrical shell is combined with the discretized dis? placement functions, which are constructed based on a linear combination of Chebyshev polynomials. These functions satisfy the boundary conditions and are independent of the cylindrical shell's parameters. The vibration characteristics of stationary cylindrical shells are determined by solving the eigenvalue problems, revealing the influence of rotary inertia on the vibration characteristics. The applicability of different shell theories with respect to various geometrical parameters of the shell is discussed. Additionally, cir? cumferential wave-dependent mode functions are identified and used to compute the natural frequencies of shell modes with the zero circumferential waves, as well as the travelling waves of the spinning cylindrical shell under different boundary conditions. The im? pact of structural parameters on the natural frequencies of the travelling waves is also analyzed.

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董有恒,李映辉,李翔宇,茅晓晨.多种边界条件下自旋圆柱壳振动特性研究[J].振动工程学报,2024,37(10):1731~1738.[DONG You-heng, LI Ying-hui, LI Xiang-yu, MAO Xiao-chen. Vibration characteristics of spinning cylindrical shells under various boundary conditions[J]. Journal of Vibration Engineering,2024,37(10):1731~1738.]

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  • 在线发布日期: 2024-10-25
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