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The effect of considering Pasternak elastic foundation on acoustic insulation of the finite doubly curved composite structures

机译：考虑Pasternak弹性基础对有限双弯曲复合结构声绝缘的影响

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摘要

This approach focuses on the acoustic characteristic of a simply supported doubly curved composite shell subjected to the Pasternak-type elastic foundation. To carry out the sound analysis of a finite shell, displacements and rotation terms and acoustic pressures are developed based on the infinite longitudinal and transversal modes. According to Hamilton's principle, the dynamic equations of the structure equipped with an elastic foundation are extracted. Subsequently, the construction is stimulated using an acoustic wave. Considering infinite modes, the necessity of terminating this process by applying a large number of modes is concerned. Therefore, in addition to the design of the convergence algorithm, some configurations against variations of dimensions and frequencies are proposed. Before presenting the numerical outcomes, the accuracy of the formulation is checked by either natural frequencies or sound transmission spectra. It is realized that although Winkler spring stiffness is impressive to improve the noise property at the low-frequency domain, the positive effects of Shear layer one are specified in the whole region. The outcomes also contain some 3D new shapes for variations of the Winkler spring and Shear layer stiffness.
机译：该方法侧重于经过普斯康纳克型弹性基础的简单支撑的双弯曲复合壳的声学特性。为了执行有限壳体的声音分析，基于无限的纵向和横向模式开发了位移和旋转术语和声学压力。根据汉密尔顿原理，提取配备弹性基础的结构的动态方程。随后，使用声波刺激结构。考虑到无限模式，涉及通过应用大量模式来终止该过程的必要性。因此，除了融合算法的设计之外，提出了一种抵抗尺寸和频率变化的一些配置。在呈现数值结果之前，通过自然频率或声音透射光谱检查配方的准确性。实现了虽然Winkler弹簧刚度令人印象深刻以改善低频域处的噪声性能，但是在整个区域中指定剪切层的正效应。结果还包含一些3D新形状，用于旋风弹簧和剪切层刚度的变化。

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