Abstract
The paper presents a new way to conduct passive elimination of vibrations consisting of covering elements of structures with low dynamic stiffness with polylactide (PLA). The PLA cover was created in 3D printing technology. The PLA cover was connected with the structure by means of a press connection. Appropriate arrangement of the PLA cover allows us to significantly increase the dissipation properties of the structure. The paper presents parametric analyses of the influence of the thickness of the cover and its distribution on the increase of the dissipation properties of the structure. Both analyses were carried out using finite element models (FEM). The effectiveness of the proposed method of increasing damping and the accuracy of the developed FEM models was verified by experimental studies. As a result, it has been proven that the developed FEM model of a free-free steel beam covered with polylactide enables the mapping of resonance frequencies at a level not exceeding 0.6% of relative error. Therefore, on its basis, it is possible to determine the parameters of the PLA cover. Comparing a free-free steel beam without cover with its PLA-covered counterpart, a reduction in the amplitude levels of the receptance function was achieved by up to 90%. The solution was validated for a steel frame for which a 37% decrease in the amplitude of the receptance function was obtained.
Highlights
Structural damping largely determines the dynamic properties of mechanical structures especially those whose functioning is accompanied by time-varying loads
This paper presents a new method of passive elimination of thin-walled structure vibrations consisting of the application of covers made of polylactide with a high damping capacity manufactured using the 3D printing technology
This paper presents a new way of passive elimination of vibrations of thin-walled structures with low dynamic stiffness consisting of covering the structure with polylactide
Summary
Structural damping largely determines the dynamic properties of mechanical structures especially those whose functioning is accompanied by time-varying loads. Active methods of vibration elimination consist of introducing an additional system into the mechanical system, which enables the elimination of vibrations by compensating them from additional sources. These methods are used in industries such as the machine tool industry [6,7,8,9,10], automotive industry [11,12], and aviation industry [13]. Recent studies have shown that polymeric materials give promising results related to the ability of these materials to dissipate vibration energy [14]. They are increasingly used in the passive elimination of vibrations
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