近似法

The calculation method also included a stair-step representation of the shroud, staggered grid system, the k-ε turbulence model and wall function method on the shroud.

计算方法还包括涵道壁的阶梯型近似，原始变量的交错网格，k-ε湍流模型和涵道壁上的壁面函数法等措施。

According to the post-tensioning method in prestressed concrete members,the calculation method of prestress losses caused by the deformation anchorage device,slip of tendon and joint compression was big in the error and narrow in the scope of application.

针对后张法预应力混凝土构件中由锚具变形、预应力钢束回缩和接缝压缩等引起的预应力损失计算方法适用范围较窄和误差较大的缺点，基于变形协调条件，通过分段近似计算方法，建立了锚具变形、预应力钢束回缩和接缝压缩等引起的预应力损失计算公式，并与实际预应力混凝土T形截面简支梁的计算结果进行了比较。

Since geostationary satellite s orbit inclination is equal to zero approximately,it will result in the ambiguity of satellite s orbit ascending node and the singularity of the normal matrix in the process of fitting.

针对静止轨道卫星轨道倾角近似为0，致使卫星轨道的升交点定义模糊，在数据拟合过程中会导致法矩阵奇异的问题，提出对卫星轨道进行轨道倾角变换拟合广播星历参数的方法，并获得较高的拟合精度。

The root-cause for the synchronous error of multiple axes of the vehicle panoramic sight platform was found after analysis with the geometric method. Since the synchronous error is caused by the windage angle produced in the working process of the optoelectronic platform, the method to correct the angular deviation at any distance is proposed. The experiment for solving the problem was implemented. The experiment indicates that the method is valid.

针对车载周视观瞄平台异轴同步性问题采用几何作图法进行分析，得到异轴同步问题产生的根源是不同光电平台转动过程中由于存在偏差角所致，对校准距离情况下的角偏差，距离小于校准距离情况下的视差和距离大于校准距离情况下的角偏差在3中不同区间的修正方法进行分析并进行等效近似，给出程序实现方法，最后用实验验证了此方法的正确性。

Since RKPM is a kind of Galerkin meshfree methods, in this thesis, penaltyfunction method is employed to enforce the essential boundary conditions,trapezoidal rule is used for the approximation of displacement field function, Gaussand Hammer quadratures are applied for the numerical integration of systemequation,self-adapting method is applied for confirming the support of the pointinterpolated.

针对 RKPM 是一种伽辽金型的无网格方法，本论文采用罚函数法引入位移边界条件，用梯形积分法则近似位移场函数，对系统方程进行积分时分别使用了 Gauss 积分和 Hammer 积分，采用自适应的方法确定计算点的定义域。

The correct coefficient of temperature difference can be taken as one, when this method is used to calculate the heat transfer coefficients of shield section.

结果表明，CRK法的计算误差小于传统计算方法，在进行遮蔽段传热计算时，错流温差校正系数可近似按l处理。

The principle,arithmetic and procedure of approximate calculating the hazard radius with TNT equivalent weight method were introduced.

文中介绍了用 TNT当量法近似计算锅炉爆炸事故危害半径的原理、计算方法和程序，最后进行了实例计算。

In this article, optical and electronic properties of ZnO doped by Al are studied based on DPT theory. Correlation energy of electron exchange is combined with GGA in the form of PW91. The elements doped by replacement and inside of ZnO are calculated. The lattice and electronic structure properties of these models are calculated and compared with the experiments and previous theoretical works.

采用基于密度泛函理论的总体能量平面波超软赝势法，电子交换关联能结合广义梯度近似PW9l形式，对Al原子不同掺杂位置的ZnO超原胞进行了几何优化，计算分析了晶体结构参数及掺杂模型的电子结构。

On base the three basic approximate of the ab initio, the calculation mode was obtained.

详细论述了从头计算法在物理模型上的三个基本近似，设计了相关的计算模型。

It is a more preferable to simpler frequency criterion, since it takes into account of frequency, vibration mode, damping, s ensor and actuator information. Reduced order model can approximate well the bas i c characteristics of the original system.

该法考虑了可观性向量、模态增益、结构阻尼系数及模态频率，较简单的频率截断法是一个很大的改进，降阶后的模型能很好地近似原系统性能。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。