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。
In the mathematical model, the incremental iteration method is used to deal with such complicated nonlinear as boundary nonlinear, physical property nonlinear, transformation nonlinear etc.
在所采用的数学模型中，用增量叠代法处理边界条件非线性、物理参数非线性、相变潜热非线性等复杂问题。
The mathematical model for well testing is established for mixed boundary in rectangle reservoirs with vertical fractures.
针对油田特定注采方式下的垂直裂缝井，建立了矩形均质油藏混合边界垂直裂缝试井数学模型。
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