A General Model for Analysis of Sound Radiation from Orthogonally Stiffened Laminated Composite Plates

• Published in: China ocean engineering Vol. 28; no. 4; pp. 457 - 470
• Main Author: 金叶青 庞福振 杨飞 李光明
• Format: Journal Article
• Language: English
• Published: Heidelberg Chinese Ocean Engineering Society 01.08.2014
• Subjects: Coastal Sciences; Engineering; Fluid- and Aerodynamics; Marine & Freshwater Sciences; Numerical and Computational Physics; Oceanography; Offshore Engineering; Simulation; 一般模型; 一阶剪切变形理论; 双向加肋; 周期性结构; 声辐射分析; 复合材料层合板; 横向剪切变形; 运动检测; orthogonally stiffened plates; equivalent dynamic flexibility; sound radiation; wavenumber analysis; first order shear deformation theory
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-014-0037-0

A general theoretical model is developed to investigate the sound radiation from an infinite orthogonally stiffened plate under point excitation force. The plate can be metallic or composite, and fluid loading is also considered in the research. The first order shear deformation theory is used to account for the transverse shear deformation. The motion of the equally spaced stiffeners is examined by considering their bending vibrations and torsional movements. Based on the periodic structure theory and the concepts of the equivalent dynamic flexibility of the plate, the generalized vibro-acoustic equation of the model is obtained by applying the Fourier transform method. The generalized model that can be solved numerically is validated by comparing model predictions with the existing results. Numerical calculations are performed to investigate the effects of the location of the excitation, the spacing of the stiffeners, the plate thickness, the strengthening form and the fiber orientation on the sound radiation characteristic of the orthogonaUy stiffened plate, and some practical conclusions are drawn from these parameter studies.