Whereas block element of interface element method ( iem ) could be arbitrary shape , the interfaces between block could describe the phenomenons of slip and crack , analysis of mesomechanics of concrete applying iem is appropriate . the model and arithmetic of iem is introduced in the paper 鉴于界面元离散模型中的块体元可以为任意形状，块体元交界面的界面又能描述滑移或开裂现象，将其应用于混凝土多相材料的细观力学行为分析及其对宏观性能的影响是很合适的。
Methods to extend the migration of endothelial cells on sprouts from four directions - moving up , down , left or right - in previous models to random direction in the present model , and develop a relevant 2d discrete model to simulate the process of tumor angiogenesis and compare the simulation results with some corresponding experimental data 方法将新生血管芽尖的内皮细胞迁移方向由先前模型的上、下、左、右四个方向扩展为任意方向，建立相应的二维离散模型，数值模拟实体肿瘤微脉管系统的生成过程，比较模拟结果与相关实验数据的符合程度。
This paper analyses mainly viscoelastic properties of conveyor belt about the belt conveyor , constructs finite element discrete models and dynamic equations for parts and system of the belt conveyor , studies thoroughly automatic modeling theory from the static state to the dynamic state of the belt conveyor system including form function of the running routex element division parameter calculation ^ state equation formation automatically and solution of system and so on 本文通过对带式输送机输送带的粘弹性特性的分析，建立了带式输送机各组成部分及其系统的有限元离散模型和动力学方程，详细地研究了带式输送机系统从静态到动态设计的自动建模理论，其中包括运行线路的形态函数、质点划分、参数计算、系统状态方程生成及其方程的求解等。
The content of this thesis comes from the fujian natural science found following research task 。 it studies on a space cantilever single beam attached to a moving support 。 inertia forces which are brought by the support ' s movement ， are acceded to the equivalent initiative forces and the equivalent initiative moments 。 when we consider the relation of the forces and deformation ， we change the method of material mechanical analysis to the elastic mechanical analysis 。 further more ， we discusses the feasibility of the method which uses the multi - rigid - body discrete model to simulate the dynamic characteristic of a elastic body 。 first ， the finite segment method is adopted to establish the models of the beam 。 based on kane ' s equations ， dynamic math - model for the beam are derived 。 and by use of c - language and runge - kutta procedure ， the computer - oriented procedure can give the whole responses of the beam 。 second ， with compare to the numerical examples ， the method which uses the multi - rigid - body discrete model to simulate the dynamic characteristic of a elastic body which is under the condition of movement is verified to be feasible 。 本论文为福建省自然科学基金后续研究课题，以已知支撑运动的单个空间悬臂梁为对象，在等效主动力与等效主动力矩中加入支撑转动引起的惯性力，并在考虑力与变形关系时，用更一般的弹性力学分析代替材料力学分析，进一步研究用多刚体离散模型来模拟其动力学特性的可行性。首先，用有限段建立机械臂的多刚体离散模型，用kane动力学方法建立其动力学方程。并用c语言编制算法程序，采用了四阶runge - kutta积分程序求解微分方程组，给出构件的全部动态历程。
At present , most majority of control projects are still based on state - space averaging model or linear small signal model , as a result , it solved the analytical problem of steady state and dynamic state low frequency signals . because of the strong non - linear of the system , the application scope of this simple model is limited greatly . to gain new breakthrough on the control of the dc - dc converter , we must establish a new , more precise and applied large signal discrete model , and we must develop unconventional sampling control theories 目前绝大多数控制方案仍然基于状态空间平均模型或线性化小信号模型，这较好地解决了pwm型dc - dc变换器的稳态和动态低频小信号的分析问题，但是又由于系统的强非线性，这种简单模型的适用范围受到了很大的限制， dc - dc变换器控制上要获得新的突破，必须建立一个新的、更精确和实用的大信号离散模型，还需要发展非传统的采样控制理论。
After the analysis of distribution network , a dynamic distribution network discrete model ( ddndm ) was presented based on the theory of the bi - level dynamic distribution network . furthermore , ant colony algorithm ( ac arithmetic ) , which is introduced in this dissertation because of the ability of resisting combination explosion to np - hard problem , now is applied in ddndm . then the ac arithmetic solve pattern , arithmetic steps and the instance result have been presented , and that the ac arithmetic applied in the ddndm to solve the np problem is appropriate 本文通过对分销网络分析,在已有的二级动态分销网络模型研究基础上,提出了动态分销网络离散模型,并且在基于meta图的供应链集成网络模型基础上对模型进行了优化,最后采用对于np完全问题具有抵御组合爆炸特性的蚂蚁算法求解此模型,给出了蚂蚁算法求解的模式、解如何通过赋权meta图构造和具体算法步骤,还给出了实例结果,通过结果表明本文提出的基于蚂蚁算法解决分销网络优化中出现的np难题,能够得到较好的效果。
In this paper , the dynamic models of two cooperative flexible manipulator is developed base on the finite segment method then the dynamics are discussed . first , the finite segment method is adopted to establish the discrete models of flexible manipulator . based on the small elastic deformations , transformation matrix of reference frame to the foundation and other kinematics matrixs are developed 首先,采用有限段方法建立机械臂的多刚体离散模型,在弹性小变形的情况下,对单机械臂的动力学进行分析,计算了坐标变换矩阵及基本的运动学矩阵,进而用凯恩方程建立了考虑臂柔性的机械臂的动力学模型。
Three kinds of discrete models of pwm dc / dc converter are deduced from sample - data method . then a complete chaotic dynamics modeling method is proposed based on float genetic arithmetic and sample - data method . nonlinear phenomena in a buck converter and a zeta converter are analyzed with the modeling method 利用数据采样方法推导了pwm型dc / dc变换器的三种采样方法的离散模型，然后在遗传算法和数据采样方法基础上提出了一套完整的pwm型dc / dc变换器混沌动力学建模方法，并利用这种方法分析了buck变换器和zeta变换器中的非线性现象。
Abstract : a mathematical model describing the effect of flow nonuniformityon the performance of compact heat exchanger is provided , which is based on that one side of heat exchanger is uniformly distributed but the other is of maldistribution . the model may be expressed in two different types , i . e . , continuous model and discrete model . the former provides a method analyzing the performance deterioration of exchanger due to flow maldistribution , and the latter provides a reference to the improvement of experimental measurement . the analyzing method obtained can be used to compute the performance deterioration of compact heat exchanger due to flow maldistribution . the result is significant to the optimization of compact heat exchanger design 文摘:以一侧流体分配不均匀的换热器模型为基础，建立了物流分配不均匀性对换热器效能影响的数学模型，通过理论分析和计算，为研究换热器内部物流分配不均匀对其效能的影响提供了一种分析方法.该理论模型包括连续模型和离散模型2种形式，前者为研究物流分配不均匀引起换热器效能的下降提供了一种分析计算方法，后者为控制实验研究的精度提供了理论依据.研究结论对换热器的优化设计具有重要意义
We compare the model that has considered decision time with the model that has n ' t considered decision time by testing several groups of data . from the comparison , it is well known that the respective mean lengths of the three queues in the former model are approximate the mean lengths of the corresponding queues in the rear model because the fortsight is considered in the former model . so the two models in the first two charpter have very important real significance 测试几组数据比较一下带决策延迟和不带决策延迟的三个队列模型，从中可以看出：由于决策时有预见性，所以带决策延迟模型中所求得的各队平均队长比较接近不带决策延迟模型中所求得的对应队列平均队长，因而前两章给出的带预见性的离散模型有很重要的实际意义
