提出非完整力学的广义达朗贝尔-拉格朗日原理，包括其牛顿表述和拉格朗日表述。此原理能导出态空间封闭的运动方程组。

Generalized DAlembert-Lagranges principle for non-holonomic mechanics, including its Newtons formulation and Lagrangian formulation, are given. This principle can lead to the closed motion equations.

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应用达朗贝尔原理建立了考虑几何非线性的方形张拉膜结构的离散非线性振动方程组；

D′Alembert′s principle is used to derive an ordinary differential equation set for free vibration of a discretized square tensioned membrane with geometric nonlinearity.

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