The new variational principles can fully characterize the initial-boundary-value problem of this dynamics.

这种新的变分原理能反映动力学初值-边值问题的全部特征。

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Then correspondently, we obtain the specific variational principles, bounded theorems, and boundary integral equations of the second stage problems.

再得到与之对应的各类变分原理，界限定理，第二阶段问题的边界积分方程。

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In this paper, some general theorems and variational principles of the boundary value problem for two time instants in nonlinear elastodynamics are developed.

本文给出了非线性弹性动力学两时端边值问题的某些一般定理及变分原理。

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