Modal Density of Honeycomb Sandwich Composite Cylindrical Shells Considering Transverse Shear Deformation

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI:10.20855/IJAV.2018.23.11241

S. J. K. Florence, K. Renji, K. Subramanian

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引用次数: 13

Abstract

Honeycomb sandwich shells with composite face sheets are of extensive use in the spacecraft industry. Information on the number of resonant modes present in a frequency band is required to study their response behaviour under acoustic excitation. Modal densities of thin composite cylindrical shells have been reported while transverse shear deformations have not been considered. But in honeycomb sandwich panels, transverse shear deformations are significant, especially at higher order modes of vibration. In this work expressions for natural frequency and modal density of composite cylinders incorporating transverse shear deformation are derived. The modal densities of a typical cylinder that are obtained using the derived expression are compared with the results obtained using the finite element method and they are similar. Effects of transverse shear and orthotropic nature of the face sheets on the modal densities are investigated. It is shown that computing the modal density of honeycomb sandwich cylinders without considering the transverse shear deformation can lead to significant errors at high frequencies. Expressions of modal densities for special cases are also derived from the general expression.

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考虑横向剪切变形的蜂窝夹层复合材料圆柱壳模态密度

复合面板的蜂窝夹层壳体在航天器工业中有着广泛的应用。为了研究它们在声激励下的响应行为，需要了解一个频带中存在的谐振模式的数目。在未考虑横向剪切变形的情况下，已报道了薄复合材料圆柱壳的模态密度。但在蜂窝夹层板中，横向剪切变形是显著的，特别是在高阶振型下。本文推导了考虑横向剪切变形的复合材料圆柱体固有频率和模态密度的表达式。用推导式计算了典型圆柱的模态密度，并与有限元法计算结果进行了比较，两者比较接近。研究了横向剪切和正交各向异性对模态密度的影响。计算结果表明，在不考虑横向剪切变形的情况下，计算蜂窝夹层柱的模态密度会导致较大的高频误差。特殊情况下的模态密度表达式也由一般表达式导出。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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