For a thermodynamic process model described by higher order state equation, the general method of reduction of order will meet with a vast amount of computation.
对高阶状态方程描述的热工对象，若使用通常的降阶方法，将会有很大的计算工作。
In order to analyze the rules of head width reduction of slab during side pressing, a finite element model was established by method of numerical simulation.
为了分析定宽过程中板坯头部失宽的变化规律，利用数值模拟的方法建立了板坯侧压的有限元模型。
By means of variable substitution and iterative method, this paper puts forth some new higher-order differential equations, and gives their formula of reduction of integrals to common denominator.
借助变量代换、迭代等方法，提出几类新的高阶常微分方程，给出其相应的通积分公式。
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