Secondly , another 2d - fem analysis is made on a practical engineering of foundation pit excavation supported by soil - nailed system . then the different distributions of tensile stress , shear stress , plastic failure zone and horizontal displacement obtained by analysis for non - supporting and soil - nailed supporting step - by - step excavation are compared with each other . some conclusions about mechanism of soil - nailed supporting system are reached from above comparisons 在计算方法与本构模型研究中，重点对ansys中基于drucker - prager弹塑性本构模型的岩土体d - p材料作了分析，指出了此材料没有对拉应力限制的缺陷并提出在计算过程中必须密切注意拉应力的大小及分布；同时提出了基坑分步开挖与支护的数值模拟过程。
In the course of simulation , the model has no relation to kriging method , it only use the matrix information of covariance or variogram . so it can conquer the disadvantage that kriging method smooth the geological parameters , and fit the numerical simulation for the geological parameters such as permeability whose values change quickly and largely . it can estimate the distribution of extra high value and extra low value of permeability more perfectly and more accurately , which the geologist and field engineer mainly care for 在模拟过程中，克里金方法本身不与模型发生关系，它仅利用协方差或变异函数这个矩信息，这样就克服了克里金方法对参数的光滑效应，使得其适用于象渗透率这样变化幅度较大的地质参数的数值模拟，对地质专家和油藏工程师最关心的渗透率的特高值或特低值的分布情况预测更为全面、准确。
The algorithm is composed of two sections . in the first section the nodes in a circuit are arranged in linear time order to preserve simulation validity . in the second section , the nodes in order are divided into several sets whose root is primary input node and nodes in which can be reached by path ; then these sets are united by connectivity among sets into some larger sets , the number of which is equal to that of processors ; at last the sets are assigned to each processor by connectivity among sets 该算法主要分为两个部分，第一部分是将电路中的节点按线性时间顺序排序，这样就保证了模拟过程的正确性；第二部分是将有序节点划分到以不同原始输入为根节点的子节点集中，并将这些子节点集按其连接量的大小合并为与处理器数目相等的子节点集合，最后将这些子节点集合按连接量分配到各个处理器上。
Two numerical examples of simple component in two and three dimensions are analyzed respectively by using the formulated transition element . the calculated results show that the formulated transition element can realize the transition between elements with different mesh densities and the calculated stress has a higher precision , which suggests that the transition method using the formulated two dimensional and three dimensional transition element is feasible for the transition between different meshes of elements in the multi - scale damage modeling 进行了相应的数值分析，应力计算结果表明：构造的过渡单元能够实现疏密网格之间的单元过渡，应力计算性能良好，表明文中所提出的过渡单元的连接过渡方案是可行的，初步实现了结构跨尺度损伤模拟过程中所需要的疏密网格单元之间的过渡。
The clutter modeling is the most important process during the simulation , so in the third chapter , the coherent clutter modeling is separately discussed and the simulation results are presented in the following . after that , the probability density characteristics and the spectral density characteristics of the generated clutter data are analyzed 由于在回波信号模拟过程中,杂波的建模是最重要的一个环节,因此在第三章中将单独对相关杂波的建模进行详细介绍,并给出相关杂波的仿真结果,同时对产生的杂波数据进行概率密度和功率谱密度的统计分析。
One dimension river flow roughness parameter inverse analysis kalman filter is introduced into the model to solve stochastic error in observed data . applying kalman filter automatism revising system , dynamic roughness course is obtained . using dynamic roughness course the model result precision is improved , it is more consistent with observed data 对于一维河道糙率参数反分析，针对观测资料存在的随机误差，引进卡尔曼滤波器的自动校正系统，求解出河道糙率变化的动态过程，使用动态糙率计算，明显改善模型的模拟精度，使模拟过程和观测过程很好吻合。
And finally , with hllc and lax - friedrichs type approximate riemann solver for discretising conservative equations and a nonconservative equation , a simple accurate and fully eulerian numerical method is presented . compared with the numerical results of hll scheme , the hllc scheme has a high resolution for shock waves and avoiding the nonphysical oscillation of the hll scheme 最后用lax ? friedrichs格式及hllc格式作为通量函数对守恒一维euler型方程组进行了离散，并将数值模拟结果和saurel的hll格式模拟结果进行了比较，发现：在两相流数值模拟过程中，相对来说hllc格式对激波的分辨率最高，结果最稳定，避免了hll格式在间断处的非物理性数值振荡。
System operators can grasp the all units " states in global and by the simulation results they can make out correct the dispatching method , improve the performance of whole power system and decide rightly the quantity of units which can satisfy the load requirement of current power system 而且利用这种仿真算法和机组调度算法结合的仿真软件可以仿真机组的调节过程，由这一模拟过程可以制定相应的调度策略，改善负荷调节与系统需求趋势相反的机组的运行状态，更好的确定适应系统负荷需求量的机组。
Abstract : based on the escape behavior model developed in the previous paper , the case of escape behavior for single person in single room is simulated in this paper to test the practicability of the mode . the escape effects are checked up for three common escape behaviors , the wall - touch moving , random moving , and trend direction moving . this paper gives the calibration of model parameters and assumptions in the simulation model . the result shows that wall - touch moving is the most effective approach for escape in relatively large space . in addition , the major problems of the simulation model and the development possibilities are discussed 文摘:在我们已建立的避难行为模拟的初步模型的基础上,为了检验该模拟模型的实用性,就单人单房避难情况进行了模拟.检验了常见的触墙移动、随机移动、大方向移动等3种避难行为模式的避难效果.文中给出了模拟过程中各种参数的计算和设定方法.模拟结果表明:在较宽阔的房屋内避难时,触墙移动是最有效的避难途径.在对单人单房避难模拟进行总结的基础上,本文还探讨了上述模型中存在的主要问题及其进一步完善的可能性
System is coordinated controlled based on serial communication between the computer and plc . the followed variables are controlled : the rotational speed of the seeding device driven draft , the operation of the converter , stability and speed of the convey belt , and inclination of the test platform , which is done to simulate actual working condition of seeder 设计了基于串行通讯的微机与plc集成控制方案，控制内容包括：排种器驱动轴转速控制、变频器的控制、传送带的稳定性及速度控制、工况模拟过程中的试验平台倾斜位置的自动控制等。
