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基于势流理论，在液体小幅度流动的前提下，考虑水中结构大变形的影响，对于具有自由液面的非线性液固耦合系统，提出了一个广义变分原理，它为这类问题的有限元数值分析提供了有力的理论依据．
Based on the potential flow theory, a generalized variational principle is proposed for a nonlinear liquid-solid coupling system with free surface considering the influence of large deformation in the water under the condition of small liquid flow. Meta-numerical analysis provides a strong theoretical basis.