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| Traveling Wave Vibration Characteristics of Hard Coating Damping Double Thin-Walled Cylindrical Shells Coupled Structure with High Rotating Speed |
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Abstract The connection conditions and vibration suppression methods of the shell coupled structure have received much attention. Moreover, the shell coupled structure, as a key component in an aero-engine, should focus on the study of traveling wave vibration characteristics. Therefore, this paper analyzes the traveling wave vibration characteristics of a rotating hard coating damping double thin-walled cylindrical shells coupled structure with bolt connection. Firstly, the discontinuous arc connection is constructed to simulate the actual bolt connection conditions by improving the artificial spring distribution method of the continuous whole circumference. And the artificial spring technique is used to construct the boundary conditions of the shell structure. Secondly, the strain energy of the hard coating shell structure is determined based on Sander’s shell theory. Finally, the effect of rotational speed is considered, and the Rayleigh-Ritz method is used to derive the dynamic equations of the shell structure. In addition, the efficient state space method is used to solve the calculation, the rationality and accuracy of the theoretical methods are verified by literature and the finite element method. The effects of rotational speed, connection stiffness, hard coating thickness, and boundary conditions on the traveling wave vibration characteristics of the shell structure are also analyzed. The results show that the traveling wave frequency increases significantly when the connection stiffness is in the range of 108~1010. Besides, the rotation leads to the separation phenomenon and an overall increasing trend in the traveling wave frequency. The effect of the larger hard coating thickness on the traveling wave frequency is more obvious, and the maximum increase in the traveling wave frequency can be up to 5.87% when the hard coating thickness is increased from 0 to 0.85 mm. Overall, the findings of this paper can provide theoretical references and data support for the engineering design of a hard coating double thin-walled cylindrical shells coupled structure.
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Received: 20 May 2024
Published: 27 December 2024
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2024, Vol. 45 
