Abstract
Purpose
In engineering applications, the vibration analysis of cylindrical shells is highly significant for the design of engineering structures subjected to external dynamic excitations. In practice, the explicit expression would make a better and more quick design comparing to the numerical results. However, the studies on analytical method were concentrated on the semi-inverse method. To overcome the limitation, we introduce a new analytical treatment for the free vibration of cylindrical shells.
Methods
Under the framework of the Hamiltonian system, an analytical symplectic approach is introduced into the free vibration of cylindrical shells. In the symplectic space, exact solutions are obtained in a rational and systematic way without any trial functions.
Results
Analytical frequency equation for arbitrary boundary conditions is derived. Highly accurate natural frequencies and analytical vibration mode functions are obtained simultaneously.
Conclusion
In this paper, the governing equations for Donnell’s and Reissner’s shell theories can be successfully transformed into the Hamiltonian form by introducing a full state vector. The free vibration of cylindrical shells is reduced into a symplectic eigenproblem. Numerical results are compared with those previously published in literature and good agreement is observed. In addition, the proposed method can be extended to micro/nanoscale cylindrical shells.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China [11672054, 11372070]; and the National Basic Research Program of China (973 Program) [2014CB046803].
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Tong, Z.Z., Ni, Y.W., Zhou, Z.H. et al. Exact Solutions for Free Vibration of Cylindrical Shells by a Symplectic Approach. J. Vib. Eng. Technol. 6, 107–115 (2018). https://doi.org/10.1007/s42417-018-0021-8
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DOI: https://doi.org/10.1007/s42417-018-0021-8