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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17 May 1999
TL;DR: In this paper, an approach is advanced by choosing parameters of structural damping for fine stage, via analysis of the loss factor of the structure, and through the experimental verification, this method could double the damping ratios, and be applicable to the same structures without changing the original interface.
Abstract: High dynamic property is a major object in fine stage design, as well as high stability. To raise structural damping is a feasible and effective method. In this paper, an approach is advanced by choosing parameters of structural damping for fine stage, via analysis of the loss factor of the structure. Through the experimental verification, this method could double the damping ratios, and be applicable to the same structures without changing the original interface.
01 May 2005
TL;DR: In this paper, the authors presented the study of equivalent material properties with visco-elastic material properties, and they used the equivalent shell FEM model with constrained layer damping material.
Abstract: This paper presents the study of equivalent material properties with visco-elastic material properties.. The goal of the study is anticipation of equivalent material properties (natural frequency, loss factor, and Young's modulus) in damping materials treatment. Through the equivalent material properties, we must design FEM model with constrained layer damping material. And equivalent material properties saved solving time in FEM model. We could acquire the visco-elastic material properties (shear modulus, loss factor) to experiment the oberst test using modified ASTM. And we can anticipate resonance of constrained beam with shift ratio between bare beam and constrained beam. Equivalent material properties of constrained beam is obtained from shear parameters (g is made of shear modulus of visco-elastic material, length, and wave number) at resonance of constrained beam. FEM model of visco-elastic material must be designed solid model. We didn't design solid FEM model but equivalent shell FEM model. So we saved solving time and convenience of FEM model mesh.
TL;DR: In this paper, the coupling analysis for a submerged active constrained layer damping (i.e., ACLD) cylindrical shell with ring ribs is developed, and a multi-virtual-point-sound-source wave function superposition method is proposed to obtain the acoustic pressure level.
Abstract: Based on the previous study, the coupling analysis for a submerged active constrained layer damping (i.e. ACLD) cylindrical shell with ring ribs is developed in this paper. Firstly, the governing equation for this kind of shell is proposed. Then, a multi-virtual-point-sound-source wave function superposition method combing the transfer matrix method is proposed to obtain the acoustic pressure level. Later, numerical results are given to verify the developed method. Finally, the damping effect for the ACLD treatment on the ring-stiffened cylindrical shell is discussed.