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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 article, a composite laminate with active constrained-layer damping treatment is studied and the interface element for viscoelastic damping layers has been developed based on the relative displacements between composite plates and piezoelectric constraining layers.

14 citations

Journal ArticleDOI
TL;DR: In this article, the frequency and temperature dependent noise radiation properties of constrained polymer layered oil pans were examined through mobility and intensity measurements, and the results showed that the reduction of noise radiation is smaller than that of the mobility at those temperatures.

14 citations

Journal ArticleDOI
TL;DR: In this paper, a multi-material topology optimization approach is presented as a systematic methodology to develop structures with optimal damping characteristics, where the structural loss factor is used as objective function during the optimization and is calculated using the complex-valued eigenmodes.
Abstract: The design of high performance instruments often involves the attenuation of poorly damped resonant modes. Current design practices typically rely on informed trial and error based modifications to improve dynamic performance. In this article, a multi-material topology optimization approach is presented as a systematic methodology to develop structures with optimal damping characteristics. The proposed method applies a multi-material, parametric, level set-based topology optimization to simultaneously distribute structural and viscoelastic material to optimize damping characteristics. The viscoelastic behavior is represented by a complex-valued material modulus resulting in a complex-valued eigenvalue problem. The structural loss factor is used as objective function during the optimization and is calculated using the complex-valued eigenmodes. An adjoint sensitivity analysis is presented that provides an analytical expression for the corresponding sensitivities. Multiple numerical examples are treated to illustrate the effectiveness of the approach and the influence of different viscoelastic material models on the optimized designs is studied. The optimization routine is able to generate designs for a number of eigenmodes and to attenuate a resonant mode of an existing structure.

14 citations

Journal ArticleDOI
TL;DR: In this article, a method for the determination of approximate values of loss factors and frequencies of rectangular plates with general boundary conditions, fully covered on one side with a constrained layer damping treatment is presented.
Abstract: A method is developed and validated for the determination of approximate values of loss factors and frequencies of rectangular plates with general boundary conditions, fully covered on one side with a constrained layer damping treatment. The method, referred to as the method of equivalent lengths, is an extension for use on plates of the commonly used practice, through eigenvalue replacement, of applying the Ross, Ungar, and Kerwin analysis to the prediction of loss factors for beams with other than simply supported ends. Application of the method requires only that the modulus, thickness, and density of the substrate, constraining layer, and shear layer be known, as well as either the eigenvalue or natural frequency for the plate of aspect ratio and boundary condition to which the constrained layer treatment is to be applied. Predictions of the method are compared with results obtained by finite element methods for plates with various boundary conditions, including those with zero, one, two, three, and four free edges.

14 citations

Journal ArticleDOI
TL;DR: In this paper, a passive constrained layer damping (PCLD) treatment patched on thin plates with respect to sound radiation at low frequency resonance is investigated, and two optimal topologies of the PCLD patches are analyzed.
Abstract: Topology optimization of passive constrained layer damping (PCLD) treatment patched on thin plates with respect to sound radiation at low frequency resonance is investigated. An extended solid isotropic material with penalization (SIMP) model is described using an interface finite element model for viscoelastic layer. Then the given FE mesh for base structure can remain the same during the optimization process. The objective function, radiated sound power, is simplified by using sound radiation mode and modal strain energy method, the merit of which is the complex dynamic equations of the composite plate need not to be solved and only modal analyses for the associated undamped modal equations are required. Numerical and experimental results show that significant reductions of the sound power are achieved. Two optimal topologies of the PCLD patches are analyzed. It's shown that to minimize the sound radiation power at low frequency, not only the structural damping but also the volume velocity should be concerned.

14 citations


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