Transactions of Nanjing University of Aeronautics & Astronautics
Thermal Modal Analysis of Doubly Curved Shell Based on Rayleigh-Ritz Method
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Abstract:
The doubly curved shell （DCS） is a common structure in the engineering field. In a thermal environment， the vibration characteristics of the DCS will be affected by the thermal effect. The research on the vibration characteristics of DCS in thermal environment is relatively limited. In this paper， the thermal strain and the change of Young’s modulus caused by the changing of temperature are studied， and the DCS energy equation is established systematically. The displacement tolerance function of the DCS is constructed by the spectral geometry method， and the natural frequencies and mode shapes of the DCS with different structural parameters， such as thicknesses， ratios of Ra/Rb and a/b， at different temperatures are solved by the Rayleigh-Ritz method. The results show that the natural frequency of the DCS decreases with the increasing temperature， Ra/Rb and a/b ratios， and increases with the increasing thickness.
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This work was supported by the National Natural Science Foundation of China（No. 51805341） and the Natural Science Foundation of Jiangsu Province （No.BK20180843）.
Clc Number:
TB31
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