本文在假定电弧截面温度分布的基础上，通过对电弧内部能量平衡的研究，提出了一个横向磁场中动态电弧的近似计算模型。
Based on the assuming of the arc temperature distribution and the investigation of the energy balance in the arc, a simplified model of the dynamic arc in transverse magnetic field is proposed.
研究了聚集查询重写的特征，根据数据仓库环境下聚集查询需要快速计算结果的特点，给出了一个基于聚集查询重写的快速近似计算模型。
This paper researches into the characteristic of aggregate query rewriting and gives a kind of rapidly approximate query computing model based on aggregate query rewriting under the data warehouse.
对低马赫数叶轮离散噪声的机理及计算方法进行了研究，并推导了离散噪声的声压计算式、低马赫数下近似计算式和轴心线上的计算式，还实验验证了计算模型。
Research is carried out on the discrete noise theory and calculation method, the calculation model of discrete noise and the approximate formula under small Mach number are verified by experiments.
利用等效线弹簧模型近似计算了含裂纹转动轴的自由振动基频。
In this paper a model of the equivalent linear spring is proposed for approximately calculating fundamental frequencies of a vibrating shaft with an arbitrary crack.
最后本文就循环流化床锅炉水冷壁磨损问题建立了有关数学模型，并利用有关参数进行了水冷壁磨损的近似计算。
At the end, the paper built the mathematical simulation of CFB boiler water wall wear and some approximate calculations was done on water wall wear by making use of some related parameters.
本文对一辆高温超导磁悬浮列车模型悬浮系统的数学模型进行简化，得出了悬浮力的近似计算解析表达式。
The paper presents an analytical formula of Maglev force with the maglev system of a HTSC maglev vehicle model being simplified.
建立了近似数学模型和介绍了近似计算方法。
The establishment of approximative mathematical model and approximative calculation are presented.
对照其模型阻力试验结果，提出了该形状物体的阻力近似计算公式并给出了相应的系数。
The coefficients of these formulas of resistance are also given according to the experimental result.
对照其模型阻力试验结果，提出了该形状物体的阻力近似计算公式并给出了相应的系数。
The coefficients of these formulas of resistance are also given according to the experimental result.
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