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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TL;DR: In this paper, a finite element formulation using zig-zag hypothesis is developed for sandwich smart structures with partially smart constrained layer damping (SCLD) treatment, where both of the viscoelastic and elastic layers of the sandwich structures are based on the Reissner-Mindlin theory.
1 citations
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11 Nov 20011 citations
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16 May 2005TL;DR: In this paper, a set of experiments using PSOL and SSOL beams in which the geometric properties of the stand-off layer were varied was conducted to analyze the contribution of standoff layer to the overall system damping.
Abstract: Passive stand-off layer (PSOL) and slotted stand-off layer (SSOL) damping treatments are presently being implemented in many commercial and defense designs. In a PSOL damping treatment, a stand-off or spacer layer is added to a conventional passive constrained layer damping treatment. In an SSOL damping treatment, slots are included in the stand-off layer. A set of experiments using PSOL and SSOL beams in which the geometric properties of the stand-off layer were varied was conducted to analyze the contribution of the stand-off layer to the overall system damping. This set of experiments measured the frequency response functions for a series of beams in which the total slotted area of the stand-off layer was held constant while the number of slots in the stand-off layer was increased for a constant stand-off layer material.
Finite element analysis models were developed in ANSYS to compare the predicted frequency response functions with the experimentally measured frequency response functions for the beams treated with PSOL and SSOL damping treatments. In these beams, the bonding layers used to fabricate these treatments were found to have a measurable and significant effect on the frequency response of the structure. The finite element model presented here thus included an epoxy layer between the base beam and the stand-off layer, a contact cement layer between the stand-off layer and the viscoelastic layer, and a method for modelling delamination.
1 citations
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TL;DR: In this paper, an analytical approach for vibration response analysis of a beam with a single passive constrained layer damping patch is presented, and the results showed that the constrained layer treatment can achieve better damping and modal strain energy method for beam with damping treatment is more effective.
Abstract: Vibration analysis of beams with sandwich constrained layer damping treatment is extended According to the elastic-viscoelastic principle and the modal strain energy method,an analytical approach for vibration response analysis of a beam with single passive constrained layer damping patch is presented Parametric studies are performed with the established analytical approach to study the effects of constrained layer damping treatment After compare between covered and uncovered beam in time domain and in frequency domain,the appears that the constrained layer damping treatment can achieve better damping and modal strain energy method for beam with damping treatment is more effective
1 citations
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16 Jun 1998TL;DR: In this paper, constrained layer damping was used to reduce the incidence of cracks in the nacelle panel of an F/A-18 aircraft during the operation of the aircraft.
Abstract: Acoustic fatigue is due to very high intensity excitation as a result of pressure waves caused by either engine/or aerodynamic effects Currently a large portion of the F/A-18 fleet has suffered from acoustic fatigue cracking in skin panel on the lower external surface of the inlet nacelle There has been a long history of cracking in this region, which is attributed to fatigue caused by acoustic excitation of the panel during the operation of the aircraft Efforts to alleviate these fatigue crack growth with traditional boron/epoxy patches was not successful This paper seek to select a set of damping material suitable for the reinforcement/damping treatment to alleviate the acoustic fatigue damage of the nacelle panel of the F/A-18 aircraft This experimental study will address the relevance of constrained layer damping reducing the incidence of acoustic fatigue problems in the nacelle region
1 citations