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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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Journal ArticleDOI
TL;DR: In this paper, a three dimensional energy-based finite element (FE) model has been developed for composite sandwich plates integrated with the patches of active constrained layer damping (ACLD) treatment.
Abstract: This paper deals with the nonlinear dynamic analysis of smart laminated composite sandwich plates. A three dimensional energy based finite element (FE) model has been developed for the composite sandwich plates integrated with the patches of active constrained layer damping (ACLD) treatment. Von Karman type nonlinear strain–displacement relations and the first-order shear deformation theory (FSDT) are adopted individually for each layer of the sandwich plate in developing the FE model. The constraining layer of the ACLD treatment is considered to be made of active fiber composite (AFC) material. The Golla–Hughes–McTavish (GHM) method is used to model the constrained viscoelastic layer of the ACLD treatment in the time domain. Sandwich plates with symmetric and antisymmetric laminated faces separated by HEREX core are considered for evaluation of the numerical results. The numerical results indicate that the ACLD patches significantly improve the damping characteristics of the composite sandwich plates for suppressing their geometrically nonlinear transient vibrations. The effect of variation of piezoelectric fiber orientation angle in the AFC material on the control authority of the ACLD patches is also investigated.

16 citations

Proceedings ArticleDOI
27 Jul 1998
TL;DR: In this article, an optimal placement strategy of ACLD patches is devised using the modal strain energy (MSE) method, aiming at minimizing the total weight of the damping treatments while satisfying constraints imposed on modal damping ratios.
Abstract: Active Constrained Layer Damping (ACLD) treatment has been used successfully for controlling the vibration of various flexible structures It provides an effective means for augmenting the simplicity and reliability of passive damping with the low weight and high efficiency of active controls to attain high damping characteristics over broad frequency bands In this paper, optimal placement strategies of ACLD patches are devised using the modal strain energy (MSE) method These strategies aim at minimizing the total weight of the damping treatments while satisfying constraints imposed on the modal damping ratios A finite element model is developed to determine the modal strain energies of plates treated with ACLD treatment The treatment is then applied to the elements that have highest MSE in order to target specific modes of vibrations Numerical examples are presented to demonstrate the utility of the devised optimization technique as an effective tool for selecting the optimal locations of the ACLD treatment to achieve desired damping characteristics over a broad frequency band

16 citations

Proceedings ArticleDOI
02 Jun 1999
TL;DR: In this article, a self-sensing configuration of the ACLD treatment is utilized to simultaneously suppress the bending and torsional vibrations of plates, and the treatment considered ensures collocation of the sensors/actuators pairs in order to guarantee stable operation.
Abstract: Active Constrained Layer Damping (ACLD) treatment has been used successfully for controlling the vibration of various flexible structures. The treatment provides an effective means for augmenting the simplicity and reliability of passive damping with the low weight and high efficiency of active controls to attain high damping characteristics over broad frequency bands. In this study, a self-sensing configuration of the ACLD treatment is utilized to simultaneously suppress the bending and torsional vibrations of plates. The treatment considered ensures collocation of the sensors/actuators pairs in order to guarantee stable operation. A three-layer network of the Self-sensing Active Constrained Layer Damping (SACLD) treatment is used to control multi-modes of vibration of a flexible aluminum plate (0.264 m X 0.127 m X 4.826E-4 m) which is mounted in a cantilevered arrangement. Two ACLD patches (0.264 m X 0.0635 m) with self-sensing polyvinylidine fluoride (PVDF) actuators oriented by (14 degrees/-14 degrees) configuration are treated on one side of plate. The theoretical characteristics of the multi-layer treatment are presented in this paper and compared with the experimental performance.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented an efficient numerical method for the harmonic analysis of viscoelastically damped structural systems characterized by a frequency-dependent structural damping matrix, making use of the complex mode superposition method.
Abstract: This paper presents an efficient numerical method for the harmonic analysis of viscoelastically damped structural systems characterized by a frequency-dependent structural damping matrix, making use of the complex mode superposition method. Departing from the undamped eigensolution, the proposed numerical method updates the complex and frequency-dependent eigenpair avoiding the solution of a complex eigenproblem for each computational frequency. The complex eigenvalues and eigenvectors are updated within the desired tolerance by an adaptive step-size control scheme using the first- and higher order eigenderivatives. The influence on the computation time of the considered number of eigenderivatives and the tolerance is discussed, and the efficiency of the proposed numerical method for the harmonic analysis of viscoelastically damped large-ordered structural systems is proved. Finally, a practical application is presented where the harmonic response of a constrained layer damping cantilever beam subjected to a base motion is analyzed. The complex and frequency-dependent eigenvalues and eigenvectors are computed, the modal contributions to the total response are determined, and the total response is approximated by the complex mode superposition method. Finally, the approximated response is validated with the exact one computed by the direct frequency method and with that experimentally measured. Copyright © 2011 John Wiley & Sons, Ltd.

16 citations


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