The optimal mathematical model of the double universal spindle must satisfy the constraints of strength, rigidity, vibration condition, stability and boundary condition.
双万向轴的优化数学模型必须满足强度、刚度、振动条件、稳定性及边界条件的约束。
Soft interlayer in rock mass is the most important boundary condition to stability of rock mass.
岩体中软弱夹层是控制岩体稳定的重要边界条件。
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