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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
Yi Liu1, Markus Zogg1, Paolo Ermanni1
TL;DR: In this paper, three different passive and active damping approaches were investigated: interface damping (ID), active constrained layer damping and particle damping, and their performances were compared in terms of weight.
Abstract: In order to increase the comfort of vehicle drivers, automotive panel structures are normally damped on their surfaces. Common surface damping treatments like free layer damping or constrained layer damping have the drawback of heavy weight and temperature as well as frequency dependent damping performance. New alternatives with simple structure, high robustness and light weight are sought. In this contribution, three different passive and active damping approaches were investigated: interface damping (ID), active constrained layer damping (ACLD) and particle damping (PD). They were surveyed under same boundary conditions and their performances were compared in terms of weight. The results show that ID strongly decouples the vibration from the source to the panel and provides steady performance over the whole frequency range. ACLD is a lightweight treatment with high damping capability for special mode shapes. PD is an effective simple damper providing excellent damping performance.

7 citations

Proceedings ArticleDOI
02 Jul 2001
TL;DR: In this article, the application of electrically shunted piezoceramic materials (PZTs) for increasing transmission loss is studied, and a test setup in an SAE J1400 facility is used to analyze the sound transmission loss due to a test plate with shunted PZTs, and to compare the results with an undamped plate and a plate with constrained-layer damping materials.
Abstract: The application of electrically shunted piezoceramic materials (PZTs) for increasing transmission loss is studied. A test setup in an SAE J1400 facility is used to analyze the sound transmission loss due to a test plate with shunted PZTs, and to compare the results with an undamped plate and a plate with constrained-layer damping materials. The test results indicate that shunted PZTs can increase sound transmission loss by approximately 6 dB for a pure tune input at 162 Hz, and 7 dB for a broad band input of 10 - 10000 Hz. The test results further show that, compared to the constrained layer damping materials that are commonly used in the automotive industry, PZTs provide a substantially higher sound transmission loss-to-weight ratio.

7 citations

Journal ArticleDOI
TL;DR: A two-level optimization model for the CLD structure is developed, considering sound radiation power as the objective function and different additional mass fractions as constraints, and several optimal position layouts of CLD materials pasted on the base structure are obtained.
Abstract: Constrained layer damping (CLD) is an effective method for suppressing the vibration and sound radiation of lightweight structures. In this article, a two-level optimization approach is presented as a systematic methodology to design position layouts and thickness configurations of CLD materials for suppressing the sound power of vibrating structures. A two-level optimization model for the CLD structure is developed, considering sound radiation power as the objective function and different additional mass fractions as constraints. The proposed approach applies a modified bi-directional evolutionary structural optimization (BESO) method to obtain several optimal position layouts of CLD materials pasted on the base structure, and sound power sensitivity analysis is formulated based on sound radiation modes for the position optimization of CLD materials. Two strategies based on the distributions of average normalized elemental kinetic energy and strain energy of the base plate are proposed to divide optimal position layouts of CLD materials into several subareas, and a genetic algorithm (GA) is employed to optimally reconfigure the thicknesses of CLD materials in the subareas. Numerical examples are provided to illustrate the validity and efficiency of this approach. The sound radiation power radiated from the vibrating plate, which is treated with multiple position layouts and thickness reconfigurations of CLD materials, is emphatically discussed.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of platelet mica fillers on the damping properties of a polymer specimen produced from a core-shell latex based on styrene, methyl methacrylate and ethylhexyl acrylate was evaluated.
Abstract: The influence of platelet mica fillers on the damping properties of a polymer specimen produced from a coreshell latex based on styrene, methyl methacrylate and ethylhexylacrylate was evaluated. This polymer is expected to exhibit an interpenetrating network (IPN) structure, and in the unfilled state it exhibits a rather broad glass transition (Tg) region. The damping peak (tan δ), evaluated by dynamic mechanical analysis (DMA), became somewhat higher when mica filler was added to the polymer but the Tg-region became somewhat narrower. The filler particle size had no appreciable influence on the damping properties of the filled polymer. Silane treatment of the mica resulted in a slight broadening of the glass transition (lower temperature side of the peak) and a decrease in the magnitude of the damping peak compared to the result obtained with untreated mica of the same particle size. The results of the DMA measurements on the polymer samples were used to calculate the composite loss factor (CLF) for a steel laminate consisting of two steel plates with a thin intermediate polymeric layer, using the theory proposed by Ross, Ungar and Kerwin (RUK). The calculated results were compared with the measured composite loss factors at higher frequencies (200 Hz or more) determined in vibrating beam tests (VBT). The agreement between the calculated and measured values with regard to the temperature location of the damping peak was reasonably good for the unfilled material, provided that the DMA values used * To whom correspondence should be addressed. for the calculations were recalculated using the timetemperature superposition principle to the actual higher frequencies used in the VBT. For the filled systems, the RUK theory predicted the location of the CLF-damping peak to be ca. 5°C higher than was observed experimentally. Possible reasons for this are discussed. Addition of the mica to the polymer affected the experimentally determined CLF values somewhat, but the changes were not very dramatic. K e y W o r d s : constrained-layer damping, core-shell latex, fillers, glass transition, LIPN, metal-polymermetal laminate

7 citations

Journal ArticleDOI
TL;DR: In this paper, the control input that maximizes the loss factor of the active constrained layer damping is determined through taking the first variation of the loss factors with respect to the control inputs.

7 citations


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