离散问题

3D-CTM (Coupled Thermo-Mechanical Forming Simulation) software for precision forging process of aero-engine blade was developed. The key technologies of 3D coupled rigid-viscoplastic thermo-mechanical FEM simulation of blade forging process were studied systematically. By using the remeshing method of contracting from the boundary to the inner, new mesh system from old distorted mesh system can be obtained. A method of modifying the position of nodes touching on the die according to its original normal was proposed to avoid "dead lock" problem due to uncontinuity of normal of scatted die meshes. The pseudo-static iterative algorithm was used to simplify the coupled thermo-mechanical computation. In particular, formulations to determine relaxation factor β was established for rigid viscoplastic FEM adopting penalty function method, and an improved cubic factor rapid algorithm derived from these formulations was proposed by combining with the advantage of advance and retreat search method.

采用基于边界构形的内缩法，实现了三维畸变网格的重新划分；提出了初矢修正法对触模节点的位置进行修正，解决了由于离散的模具网格的法矢不连续造成的&死锁&问题；采用准静态迭代法简化了速度场和温度场耦合计算过程；特别是针对减速因子β的选取，建立了适用于三维复杂成形过程刚粘塑性罚函数法有限元三次因子法的计算公式，并结合进退搜索法提出了改进的三次因子快速算法，提高了模拟计算效率和稳定性，在此基础之上，开发了面向叶片精锻过程的三维刚粘塑性热力耦合有限元模拟分析系统(3D-CTM)，系统的可靠性得到了圆柱体镦粗的验证。

This paper aims at the time performance of the entire system and uses the task flow graph as the system model.Based on it,an evaluation function based on the priority is achieved,then a new algorithm combining the search space smoothing technology with discrete particle swarm is proposed and whose parameters can be adjusted automatically.At last,the combination problem is addressed.

以提高系统时间性能为目标，利用任务流图构造系统模型，在其上实现了基于优先权的评价函数，提出了搜索空间平滑技术与离散粒子群算法相结合的软硬件划分算法，并且解决了两者的融合问题，并能根据系统信息动态适应调整算法参数。

This paper introduces a new technology of Latent Semantic Indexing to solve large scale computing of web page s index.

利用潜在语义索引的最新技术半离散矩阵分解算法来解决大规模网页索引计算的问题，在实践中根据稀疏矩阵的特点，对该算法进行改进，有效降低检索的响应时间，提高检索效率。

The method of finite element discrete and optimal parameter back analysis is adopted.(3) Concentrated on the question of high external water pressure of the deep-lying tunnel, the basic theory and method calculating external water pressure are systematically studied.(4) Based on Jinping cascade 2 hydropower station, numerical simulation rain infiltration of seepage field under different drainage pattern and grouting pattern are studied, also, the high external water pressure is analyzed and studied and some seepage control measures are put forward.

2采用有限元离散—优化法进行参数的反演分析；(3)针对深埋隧洞的高外水压力问题，进一步分析和研究了衬砌水荷载及外水压力的作用机理和计算方法；(4)以锦屏二级水电站深埋长引水隧洞作为本文的主要研究对象，采用考虑降雨入渗渗流场分析的方法对排水方案和灌浆封堵方案不同情况下的渗流场的水头分布进行了数值模拟，并对其外水压力进行了分析和研究，提出了渗流控制的具体措施。

The dynamics model of missile sealifts system for navy ships connected parallely is established. The dynamics simulation analysis of system is studied. The dynamics characteristic of missile box on the condition of different sea states and place parameters of crane are analyzed. The theory and technology bases for the design of system of missile sealifts or navy ships connected parallely are presented. The controlled multibody system dynamics of the system of missile sealifts with wave compensation for navy ships connected parallely is presented. On the condition of stochastic momevement of depot ship and incept ship and under the action of sealifts and wave compensation, the dynamics of sealifts system is studied by using discrete time transfer matrix method of multibody system. The calculate method of electric machine impule is developed in the process of supplying missile and action of wave compensate. Based on the PLC control system, the control method, which control supply process by testing torque of guide strings is presented.

本文建立了舰艇并靠导弹补给动力学模，进行了舰艇并靠导弹补给及波浪补偿系统动力学仿真分析，获得了导弹箱在不同海况下和舰用起重机不同位置参数的运动规律，为舰艇并靠导弹补给系统设计提供了理论依据和技术基础；建立了舰艇并靠导弹补给及波浪补偿受控系统多体动力学，在补给舰和被补给舰随机运动下，在补给和波浪补偿系统作用下，应用多体系统离散时间传递矩阵法进行了补给系统动力学分析，得到了导弹补给过程中，波浪补偿时，导引电机和卷扬电机输入电机脉冲计算方法；建立了以PLC 控制系统为核心，用扭矩传感器测量导引带产生的扭矩来控制补给过程的控制方法；对系统振动问题进行了研究，提出了通过调整伺服电机参数减少系统振动的方法。

In chapter 7, quality loss cost is first used in the model of simultaneous design of tolerance, and economically attainable accuracy of position is first considered as constraint condition. It is first proven that the function of simultaneous design of tolerance is non-convex program; discrete and continuos Simulated Annealing are introduced; the optimum software to solve this model is given.

第七章首次将质量损失成本用于公差并行设计的优化数学模型中，并首次考虑位置精度的经济加工精度范围作为约束条件；论证了公差并行设计优化模型的非凸规划问题；着重介绍了离散型和连续型的模拟退火算法SA；研制了公差并行设计的优化软件。

The article that is based on theoretical knowledge of the discrete math and the computer technique provide numeric stimulate pattern of the flat-faced follower eccentric circle institution, which is applied to resolve the wearing problem of flat-faced follower eccentric circle institution.

本文基于离散数学理论和计算机技术提出了平底从动件偏心圆机构系统磨损的数值仿真模型，可用于解决平底从动件偏心圆机构系统的磨损问题。

The location of the discrete piezoelectric sensors/actuators is carefully discussed in this paper on the basis of foundation of 2-D plate test system.

本文在建立二维柔性板实验系统的基础上，深入研究了离散型压电式传感器与作动器的最优配置问题。

In order to solve the problem, we give the definition of minimum-energy frame in the discrete signal space, and then prove some of its good properties.

为解决这一问题，本文给出了离散信号空间上的最小能量框架的定义，并证明了它所具备的一些优良性质。

The contour smoothing processing focused on the common zigzag and blurred effect occurred in conventional segmented images. The problems of fragments and furcations were also solved by the characteristic analysis of the local gray level.

该算法把消除颗粒噪声、采样离散化误差作为边缘平滑的重点；通过对图像局部灰度特性的分析解决了轮廓跟踪过程中出现的断边、分支问题。

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