Abstract
To reduce the vibration of the plate-like structure under different boundary conditions, an all-metal damping composite structure was proposed, and its damping layer was entangled metallic wire material (EMWM). A series of quasi-static compression tests were carried out to investigate the damping property of the EMWM layer. A modal test system was set up to evaluate whether the EMWM could dissipate vibration energy. The evaluation results showed that the displacement deviation between the baseplate and constraining plate of the structure was large enough and the EMWM could dissipate vibration energy in the form of friction. The modal characteristics of the composite structure with different core thicknesses under different boundary conditions were researched in this paper by experimental modal tests. The outcomes showed that the damping ratio of the structure would be significantly improved by adding EMWM and constraining plate. The larger the thickness of the core thickness is, the larger the damping ratio and vibration reduction performance of the composite structure are. This paper provides a new technical way for the damping design of high temperature plate structure.
Highlights
Vibration and noise are ubiquitous in the fields of aviation, automobiles, ships, and buildings. ese vibrations and noise will accelerate the fatigue damage of the structure, shorten the service life of the equipment, affect the comfort of the working and living environment, and even harm the health of the human body
E damping mechanism of the composite structure with Entangled metallic wire material (EMWM) layer is as follows: when the baseplate is subjected to external excitation, the displacement response of the baseplate and the constraining plate will be generated, respectively, and the deviation of displacement response between the baseplate and the constraining plate will change the deformation of EMWM; the vibration energy will be dissipated by friction
The maximum displacement deviations are over 30 μm in the first-order modal frequency, and those in the second
Summary
Vibration and noise are ubiquitous in the fields of aviation, automobiles, ships, and buildings. ese vibrations and noise will accelerate the fatigue damage of the structure, shorten the service life of the equipment, affect the comfort of the working and living environment, and even harm the health of the human body. E first purpose of this paper is focused on the effect of core thickness on the dynamic properties of the composite structure, so three batches of EMWM layer with different thicknesses (4 mm, 6 mm, and 8 mm) are manufactured. E EMWM damping layer is relatively slidable between the baseplate and the constraining plate, and the energy dissipation mechanism of the two structures will be different. E damping mechanism of the composite structure with EMWM layer is as follows: when the baseplate is subjected to external excitation, the displacement response of the baseplate and the constraining plate will be generated, respectively, and the deviation of displacement response between the baseplate and the constraining plate will change the deformation of EMWM; the vibration energy will be dissipated by friction. E baseplate, EMWM layer, limit block, and constraint plate are constrained and fixed by four bolts E composite structure with EMWM layer is shown in Figure 6. e real structure is shown in Figure 6. e bottom is the baseplate, the middle is the EMWM layer, and the top is the constraining plate. e limit block is used to compress the EMWM layer by the same amount of 2 mm. e baseplate, EMWM layer, limit block, and constraint plate are constrained and fixed by four bolts
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