Abstract
Starting from the basic equations of hydrodynamics, the maximum powertype variational principle of the hydrodynamics of viscous fluids was established by Weizang CHIEN in 1984. Through long-term research, it is clarified that the maximum power-type variational principle coincides with the Jourdian principle, which is one of the common principles for analytical mechanics. In the paper, the power-type variational principle is extended to rigid-body dynamics, elasto-dynamics, and rigid-elastic-liquid coupling dynamics. The governing equations of the rigid-elastic-liquid coupling dynamics in the liquid-filled system are obtained by deriving the stationary value conditions. The results show that, with the power-type variational principles studied directly in the state space, some transformations in the time domain space may be omitted in the establishing process, and the rigid-elastic-liquid coupling dynamics can be easily numerically modeled. Moreover, the analysis of the coupling dynamics in the liquid-filled system in this paper agrees well with the numerical analyses of the coupling dynamics in the liquid-filled system offered in the literatures.
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Project supported by the National Natural Science Foundation of China (No. 10272034) and the Fundamental Research Funds for the Central Universities of China (No.HEUCF130205)
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Song, H., Liang, L. Investigation of power-type variational principles in liquid-filled system. Appl. Math. Mech.-Engl. Ed. 36, 1651–1662 (2015). https://doi.org/10.1007/s10483-015-2004-6
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DOI: https://doi.org/10.1007/s10483-015-2004-6