查询词典 numerical constant

In case of the limited kinematic strain hardening material model, a numerical method is proposed for upper bound shakedown analysis of elbow structures under the combined action of constant and complex variable loads.

本文在考虑有限随动应变强化材料模型的情况下，提出了恒定载荷与复杂变化载荷联合作用下弯管结构安定上限分析的有限元数学规划方法。

A large uumber of numerical calculations using the analytic formula and the dispersion equation have been candied out on the relations of the attenuation and phase constant with wave frequency, thickness and conductivity of the lossy layer.

此式适用于截止频率附近，通过解析表达式和波导模式色散方程，对衰减常数和相位常数进行了大量数值计算，得到了它们随损耗层厚度、频率以及损耗层电导率的变化规律，两种方法所获得的结果有较好的一致性，研究表明，损耗强度和损耗层厚度的变化会改变波导中电磁模式的色散和简并特性，对于改善高功率回旋行波放大器中注波互作用带宽和模式竞争非常有益。

Numerical control lathe have following outstanding superiority than traditional lathe include:Can process out complicated parts, such as the curve coming out in traditional machine tooling, curved surface,etc;Because computer have superb operation ability is can instantaneous to calculate out each coordinate axis instantaneous amount of exercise that should move accurate, So can compound into the complicated curve or curved shttp://www.51lun-wen.cnurface ;Can realize automation that process is and flexible automation, so efficiency constant traditional lathe raises by 3-7 times;Because the computer has memory and stores ability ,Can carry out automatically according to the order that the procedure stipulates,so realize automation;Proceshttp://www.51lun-wen.cnng precision of part high, size disperse degree light, make and assemble easy, No longer need to" repair the damaged parts of a machine and supply replacements";Can realize the concentration of many processes,have many kinds of self-containment functions,such as autoalarm, controlling, automatic compensation automatically,etc;Therefore can realize that nobody guards and processes for a long time.

机床数控化改造可以加工出传统机床加工不出来的曲线、曲面等复杂的零件。数控机床比传统机床有以下突出的优越性，由于计算机可以瞬时准确地计算出每个坐标轴瞬时应该运动的运动量，因此可以复合成复杂的曲线或曲面；可以实现加工的自动化，而且是柔性自动化 http：//www.51lun-wen.cn ，从而效率可比传统机床提高3～7倍；由于计算机有记忆和存储能力，可以将输入的程序记住和存储下来，然后按程序规定的顺序自动去执行；加工零件的精度高，尺寸分散度小，使装配容易，不再需要"修配"；可实现多工序的集中，减少零件在机床间的频繁搬运；拥有自动报警、自动监控、自动补偿等多种自律功能，因而可实现长时间无人看管加工。

Numerical control lathe have following outstanding superiority than traditional lathe include:Can process out complicated parts, such as the curve coming out in traditional machine tooling, curved surface,etc;Because computer have superb operation ability is can instantaneous to calculate out each coordinate axis instantaneous amount of exercise that should move accurate, So can compound into the complicated curve or curved surface ;Can realize automation that process is and flexible automation, so efficiency constant traditional lathe raises by 3-7 times;Because the computer has memory and stores ability ,Can carry out automatically according to the order that the procedure stipulates,so realize automation;Processing precision of part high, size disperse degree light, make and assemble easy, No longer need to" repair the damaged parts of a machine and supply replacements";Can realize the concentration of many processes,have many kinds of self-containment functions,such as autoalarm, controlling, automatic compensation automatically,etc;Therefore can realize that nobody guards and processes for a long time.

机床数控化改造可以加工出传统机床加工不出来的曲线、曲面等复杂的零件。数控机床比传统机床有以下突出的优越性，由于计算机可以瞬时准确地计算出每个坐标轴瞬时应该运动的运动量，因此可以复合成复杂的曲线或曲面；可以实现加工的自动化，而且是柔性自动化，从而效率可比传统机床提高3～7倍；由于计算机有记忆和存储能力，可以将输入的程序记住和存储下来，然后按程序规定的顺序自动去执行；加工零件的精度高，尺寸分散度小，使装配容易，不再需要"修配"；可实现多工序的集中，减少零件在机床间的频繁搬运；拥有自动报警、自动监控、自动补偿等多种自律功能，因而可实现长时间无人看管加工。

The explicit form of this method is very similar to that of the Newmark explicit method while its numerical characteristics are exactly the same as those the constant average acceleration method.

此新发展的外显式积分法其一般式和Newmark外显式积分法非常相似，然而，它的数值特性却完全与等平均加速度积分法一样。

The numerical relationship between the proportionality constant of surface roughness scattering mobility model and surface roughness degree is deduced.

推导出SiC表面粗糙散射迁移率模型的参数与界面粗糙度之间的数值关系。

Based on the equilibrium equation of an arch element the cubic nonlinear dynamic model with second order is established and the nonlinear differential dynamic system without constant term is obtained through a transfer process of T=U+b. Hence three fixed points and the homoclinic orbits are found. The critical condition of the chaotic vibration of the elastic arch is given by using the method of Melnikov function. The numerical results of the stationary and chaotic motion are given and discussed.

首先利用拱的单元平衡方程建立了拱的二阶三次非线性动力学模型；然后通过变换使方程转化为不含常数项的非线性微分动力系统，并由此得到无扰动系统的3个不动点与同宿轨道；再用Melnikov函数法给出了发生混沌的临界条件；最后给出了该系统出现定常运动和混沌运动的数值结果。

The astringency, error and stability of the numerical method are researched. Zero matrix method, constant matrix method, and Jacobian matrix method are constructed in order to improve numerical precision and efficiency.

研究了所提数值计算方法的误差、稳定性、收敛性等数学性质，在计算精度和计算效率两方面提出了一些改进措施，构造了零矩阵法、常数矩阵法、雅可比矩阵法等计算格式。

The results show that:(1) The penetration resistance of functionally graded layered armour made of metal Matrix Composites is better than that of the Aluminum plate;(2) The penetration resistance of the functionally graded layered armour whichlay_up is 0%/57%/0%/26%/0%/12%/0% is the best;(3) The resistance penetration of the the functionally graded layered armour can be greately promoted through optimizing the lay_up and volume fraction of the reinforced particle;(4) The functionally graded armour in which the particles distribute continuous has better behavior of resistance penetration when the volume fraction of the reinforcements are constant;(5) The higher volume fraction of the reinforcements at the surface of FGM and the more non-homogeneous the reinforcements distribution, the higher thesurface Youngs Modulus and the flow stress are;(6) The behavior of penetration resistance of the functionally graded armour in which the particles distribute continuously is better than that of homogeneous steel plate;(7) The functionally graded armour provedes a important approach for the optimization and design of the resistance penetration;(8) The numerical results of simulation of the bird striking the aircraft structureshow that the finite element model of the balance leg is effective;(9) The numerical results show that the structure internal force is relative largewhen the bird strikes the top of the balance leg;(10) The process of the birdstrike is thaf.after the bird penetrting through the front skin of the balance leg and striking the front beam,the bird is broken up in three parts.

经过本文所进行的数值模拟后我们发现：(1)在层状梯度装甲板的抗侵彻过程中层状功能梯度板比铝板的抗侵彻性能好；(2)在层状梯度装甲板的抗侵彻过程中铺层顺序为0%/57%/0%/26%/0%/12%/0%的功能梯度装甲板的抗侵彻性能最好；(3)通过优化组合层状梯度板的铺层顺序以及增强颗粒的含量可以大大改善梯度板的抗侵彻性能；(4)当SiC颗粒体积含量一定时，增强颗粒连续分布的功能梯度板表现出了优越的抗侵彻性能；(5)增强颗粒连续分布的功能梯度板表面SiC颗粒体积含量越高，分布越不均匀，表面的弹性模量就越高，屈服应力就越高；畜此工业大学硕士研究生学位论丈(6)增强颗粒连续分布的功能梯度装甲板比匀质钢板表现出良好的抗侵彻性能；(7)功能梯度装甲板为整个抗侵彻性的优化设计提供了重要的途径。

The accuracy of present numerical model is verified by the simulation of a rectangular harbor with constant water depth. For Taipei Harbor calculations, three incident wave directions, namely, WNW, N and NNE, together with constant water depth of 10m are considered.

接著考虑台北港第三期配置，使用三个波波浪入射方向与代表性水深(10m)，配合港区码头位置的选定，计算入射波浪周期与波高放大因子的关系，同时由共振周期计算港域波浪场的分布情形，藉以了解台北港第三期规划案港池振荡的特性。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新