Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.
根据变换
程与约束程显含时间的
，
出了定常约束与定常系统判据的同表述。
程(式)Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.
根据变换程与约束程显含时间的，出了定常约束与定常系统判据的同表述。
Axisymmetric elasticity problem of cubic quasicrystal is reduced to a solution of a partial differential equation with higher-order by introducing displacement function.
本文通过引入位移函数使
准晶的轴对称弹问题化为求解一高阶偏微分程。
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