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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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Dissertation
01 Jun 2016
TL;DR: In this article, a velocity feedback control strategy was applied to cantilever beams with four different configurations of HAPCLD treatment to check their applicability, and the application was expanded to flat and curved plates.
Abstract: The basic concept of Hybrid Active-Passive Constrained Layer Damping (HAPCLD) treatment was proposed by introducing active control to the concept of passive constrained layer damping configuration in the 1990s to compensate for weak points in active and passive controls by using their respective merits for more robust and stable control. Since then, combinations of various configurations and applicable control strategies have been proposed and studied in many engineering areas. However, there is still a need for a new modelling method to more easily establish models of HAPCLD treatment and its validation through control analysis and experiment with various structures from beams to curved plates. In this thesis, velocity feedback control strategy was applied to cantilever beams with four different configurations of HAPCLD treatment to check their applicability. Moreover, the application was expanded to flat and curved plates. Control results with each configuration for flat and curved plates were analysed by using self-established MATLAB codes based on the Finite Element Method (FEM) with the basic concept of a layer-wise approach for coupling each layer of structures and deriving Equivalent Single Layer (ESL) models. This new numerical modelling method was established by introducing coupling matrices based on a layer-wise approach to combine individual FE mass and stiffness matrices of each layer into one ESL model for a whole structure. Furthermore, these numerical models were supported by experiments in a lab. All measured data was compared with simulation results and they were confirmed in good agreement in general. In addition to this, the relation between mode shapes and control by piezoelectric patches occupying a broader area than an ideal actuator was studied to find the conditions for more stable control of flat and curved plates. In conclusion, as discussed for active control with beams, AC/PSOLD treatment, which consists of a piezoelectric actuator directly attached to a base structure and a stand-off layer with a viscoelastic core and elastic constraining patch laminated on the piezoelectric actuator, was clarified to give the most efficient and robust active control results for plates regardless of the curvature of all HAPCLD treatments dealt within this thesis as well. AC/PSOLD treatment could give similar reductions with smaller control gain in simulation. And, larger reductions were obtained with measured transfer functions in experiments than other configurations.

1 citations

01 Jan 2004
TL;DR: By analyzing the correlation between modal calculations and modal experiments of a typical aerospace supporter, an effective finite element analysis (FEA)model of the actual aerospace supporter is created.
Abstract: By analyzing the correlation between modal calculations and modal experiments of a typical supporter, an effective finite element analysis( FEA)model of the actual aerospace supporter is created. According to the analysis of constrained viscoelastic damping, the strategies of PVC have been worked out, and the correlation between modal calculations and modal experiments of the supporter has also been computed, and then, an experiment has been designed based on the calculation results. The results of experiments verify that the PVC strategy can effectively suppress vibration.

1 citations

Proceedings ArticleDOI
29 Jul 2004
TL;DR: In this paper, the authors developed designs and predictive models of thermoplastic matrix devices used to enable isolation for rafted machinery on marine systems, which are subject to large out-of-plane as well as normal forces and these impinge large displacements and torque loads on such mounts.
Abstract: The research develops designs and predictive models of thermoplastic matrix devices used to enable isolation for rafted machinery on marine systems. The issue is that in high sea states such isolation devices are subject to large out-of-plane as well as normal forces and these impinge large displacements and torque loads on such mounts. To design a damping augmentation treatment requires that the treatment itself be immune to such large deviations from normal load conditions and be survivable in harsh environmental conditions. The approach we have taken is to refine a successful approach using polymer constrained layer damping in a new design that accommodates such loading conditions.

1 citations

Journal ArticleDOI
TL;DR: In this article, a transfer function method for a cylindrical shell with a partially passive constrained layer damping (PCLD) treatment is presented, where a thin shell theory based on the Donnell-Mushtari-Vlasov assumption is employed to yield a mathematical model.
Abstract: This paper presents a transfer function method for a cylindrical shell with a partially passive constrained layer damping (PCLD) treatment. A thin shell theory based on Donnell-Mushtari-Vlasov assumption is employed to yield a mathematical model. The equation of motion and boundary conditions of a cylindrical shell with partially PCLD are derived. The paper provides theory supports for PCLD structure’s engineering applications in submarine weapon field.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202227
202123
202020
201927
201826