Abstract：Hard-coating damping is a new damping and vibration reduction technology. The modeling and analysis methods of hard coating composite structures under random excitation load have not yet been studied. In this paper, the finite element modeling method and the pseudo excitation method (PEM) are combined to realize the vibration modeling and prediction of vibration reduction performance for the hard-coating cantilever thin plate structure under random excitation. First, based on the equivalent single-layer method, a finite element model of the vibration characteristics of the thin plate structure with hard coating on two sides is created, and the equation of motion of the composite plate structure including the coating material damping and the remaining equivalent viscous damping under the basic excitation is obtained. Then, using the pseudo excitation method (PEM) to convert the steady random excitation load spectrum into simple harmonic excitation, and the solution method of the response power spectrum density of the hard-coating thin plate structure under random excitation is obtained. Finally, a case study was carried out for a 45# steel cantilever plate coated with NiCrAl hard-coating material on both sides as an example. The natural frequency of the hard-coating plate structure and the vibration response under random base excitation are calculated using the developed method, and compare with the experimental data to verify. Furthermore, the influence of the thickness, storage modulus and loss factor of hard coating on the vibration characteristics of the cantilever plate is analyzed. The results show that an appropriate increase the values of coating parameters mentioned above can effectively improve the vibration damping effect of hard coating.
孙悦，刘晓峰，孙伟. 随机激励作用下硬涂层薄板振动有限元分析及减振预估[J]. 振动与冲击, 2022, 41(4): 63-69.
SUN Yue，LIU Xiaofeng，SUN Wei. Vibration analysis of a hard-coating thin plate under random excitation using FEM and estimation of vibration reduction effect. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(4): 63-69.
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