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.
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。
As an approximate method, with the trigonometric function, the simple pendulum dynamical equation is simplified, and the approximate formula for the period of simple pendulum movement is presented.
利用三角函数作为一种近似方法，对单摆的动力学方程进行了简化，给出了大角度条件下单摆运动的周期的近似公式。
A new approximate formula for the large deflection problem of compression bar with two ends are simply supported is obtained, by the use of Ritz-Galerkin method.
通过非线性振动中常用的里兹-伽辽金法，推出了两端铰支压杆大挠度问题的一个新近似公式，计算结果表明具有较高的精度。
The eigenvalue equation and approximate formula for cut-off frequencies of guided modes are obtained by vector-field-method.
采用矢量场法，得到了在弱导条件下传导模式的特征方程和截止频率的近似计算公式。
According to B-S European options, the approximate formula of real estate options can be deduced based on the NPV method in the paper.
在收益法价值评估的基础上，根据欧式B - S期权定价公式，给出房地产实物期权定价近似公式。
Based on the geological mechanical model, the paper USES approximate analysis method, reaching the actual theory calculation formula.
本文以其地质力学模型为背景，采用逼近法进行分析探讨，得出了符合实际的理论计算公式。
Methods Based on central limit theorem and continuity correction principal , the formula of once approximate method and its continuity correction formula were derived.
方法根据中心极限定理和连续性校正原理，给出一次近似法和校正一次近似法计算总体率可信区间的公式。
An approximate formula for calculating the ultimate load on a foundation was derived by using the generalized limit equilibrium method.
应用广义极限平衡法获得了地基极限荷载的近似计算公式。
A computational formula of approximate value of minimum point and minimum value for some particular functions was infered by interpolation method of equidistant points.
利用等距节点的插值的方法 ，推导出某些特殊函数的最小点及最小值的近似值的计算公式 。
A computational formula of approximate value of minimum point and minimum value for some particular functions was infered by interpolation method of equidistant points.
利用等距节点的插值的方法 ，推导出某些特殊函数的最小点及最小值的近似值的计算公式 。
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