关键词:
Thin walled structures
摘要:
Finite element software was utilized in this paper to simulate the temperature distribution in the thickness direction of a cylindrical shell under real thermal field conditions. Combining this with the generalized Jacobi polynomials and the Rayleigh-Ritz method, a semi-analytical model for the free vibration of hard-coated thin-walled cylindrical composite structures in a steady-state thermal environment was established. Using a thin-walled cylindrical shell coated with NiCoCrAlY hard coatings as an example, the vibration characteristics under a steady-state thermal field were analyzed. The validity and accuracy of the semi-analytical model were verified by comparing theoretical calculations with finite element results under different temperature conditions (20 °C, 50 °C, 100 °C, 150 °C, 200 °C). Additionally, the effects of truncation number N, different temperatures, and substrate thickness on the vibration characteristics of hard-coated thin-walled cylindrical composite structures were discussed. The results indicate that when the truncation number N reaches 7, more accurate vibration analysis results can be obtained. The modal loss factor increases with the circumferential wavenumber, especially under high-temperature conditions. The natural frequency decreases as the temperature rises, with the rate of decrease accelerating at higher temperatures. As the substrate thickness increases, the modal loss factor shows a decreasing trend, with the extent of decrease being more significant at higher temperatures. © 2025 Chinese Vibration Engineering Society. All rights reserved.