Analysis of vibro-acoustic response of un-baffled laminated composite conical shell panel with varying thickness

International Conference on Mechanical, Materials and Renewable Energy

机械制造;材料科学;能源学

Sharma, N.^1 ; Mahapatra, T.R.^2 ; Panda, S.K.^3

School of Mechanical Engineering, KIIT, Odisha, Bhubaneswar

751024, India^1

Department of Production Engineering, Veer Surendra Sai University of Technology (VSSUT), Burla, Odisha

768018, India^2

Department of Mechanical Engineering, NIT, Rourkela, Odisha

769008, India^3

关键词: Finite element packages;    Indirect boundary elements;    Laminated conical shells;    Radiation characteristics;    Stiffness variations;    Vibrating structures;    Vibro acoustic response;    Vibro-acoustic modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/377/1/012139/pdf
DOI  :  10.1088/1757-899X/377/1/012139

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This article presents the vibro-acoustic modeling and analysis of un-baffled laminated composite conical shell panels with varying thickness subjected to harmonic point load. The variation of thickness is considered to be unidirectional. A simulation model for the vibrating panel is developed using the commercial finite element package (ABAQUS). The natural frequencies are computed and compared with available published values for validation purpose. Then, the modal values are exported to LMS Virtual.Lab environment where an indirect boundary element approach has been adopted to extract the coupled vibro-acoustic responses. The sound power radiated by the vibrating structure computed using the present scheme is compared with the results available in the published literature. A comprehensive study has been performed to highlight the effect of thickness variation, excitation location, lamination scheme and support conditions on the acoustic radiation responses of the laminated conical shell panel. The variation of thickness is observed to greatly influence the mode shapes of the panel thereby influencing the sound radiation characteristics. The stiffness of the panels is affected by the lamination scheme, which in addition to stiffness variation due to varying thickness alters the radiation characteristics of the panels significantly.