Topic
Constrained-layer damping
About: Constrained-layer damping is a research topic. Over the lifetime, 795 publications have been published within this topic receiving 15758 citations.
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26 Feb 2011-World Academy of Science, Engineering and Technology, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering
TL;DR: In this article, the analysis of active constrained layer damping (ACLD) of doubly curved laminated composite shells using active fiber composite (AFC) materials has been dealt with.
Abstract: This paper deals with the analysis of active constrained layer damping (ACLD) of doubly curved laminated composite shells using active fiber composite (AFC) materials. The constraining layer of the ACLD treatment has been considered to be made of the AFC materials. A three dimensional energy based finite element model of the smart doubly curved laminated composite shell integrated with a patch of such ACLD treatment has been developed to demonstrate the performance of the patch on enhancing the damping characteristics of the doubly curved laminated composite shells. Particular emphasis has been placed on studying the effect of variDWLRQRISLH)RHOHFWULF�oEHURULHQWDWLRQDQJOHLQWKHFRQVWUDLQL QJ� AFC layer on the control authority of the ACLD patch.
TL;DR: Based on the Zig-Zag theory and Hamiltonian principle, the electromechanical coupling dynamic finite element (FE) model of piezoelectric damping laminated structure is established, the natural frequency and loss factor of the structure is accurately calculated as discussed by the authors .
Abstract: Based on the zig-zag theory and Hamiltonian principle, the electromechanical coupling dynamic finite element(FE) model of piezoelectric damping laminated structure is established, the natural frequency and loss factor of the structure is accurately calculated. The eight nodes quadratic element is adopt for FE modeling, each node with seven DOFs, which considers the complex elastic modulus of damping layer. The correctness of model is verified by the calculation and simulation of an example in the literature. The effects of reinforcement orientation angle, thickness of damping layer and structure curvature on the frequency and loss factor of piezoelectric damping laminated structure are investigated. This study can provide references for vibration control and optimization design of piezoelectric damping laminated structures.
01 Jan 2015
TL;DR: In this paper, an acoustic topology optimization of the flexible plate with constrained layer damping (CLD) treatment coupled with a rigid acoustic cavity is presented to minimize the sound radiation power.
Abstract: An acoustic topology optimization of the flexible plate with constrained layer damping (CLD) treatment coupled with a rigid acoustic cavity is presented to minimize the sound radiation power. A mathematical model is developed to simulate the sound radiation based on the theories of finite element as well as boundary element theories together. The model is integrated with the acoustic topology optimization approach which adopts the evolutionary structural optimization (ESO) method to search the optimal layout of CLD material on the plate to suppress sound radiation inside the cavity. The sound radiation power and sound pressure at certain modal frequency are considered as the optimal objectives respectively, while the volume fraction of CLD material on the plate is selected as the constraint condition. Numerical results demonstrate the effectiveness of the topology optimal layout of CLD material on the flexible plate to attenuate sound radiation inside the cavity as an available invaluable design tool in engineering. Experimental verification is carried out by manufacturing topology optimized plates and monitoring their sound radiation into a rigid acoustic cavity. The measured sound pressures are found to be in good agreement with the predictions of the mathematical model.