In this paper , the state of history and present for discrete element method are reviewed and summarized . extended element models are presented by extending on motohiko hakuno and noriyuki utagawa existing models 本文回顾和总结了离散单元法的发展历史及其研究现状，对现有模型进行了扩展，提出了基于motohikohakuno的改进单元模和基于noriyukiutagawa的改进单元模型。
We also develop an experiential formulation based on structural unit model for high - index surfaces and that can give an estimate of the energies of the high - index surfaces , given the value of surface energy of ( 001 ) , ( 110 ) or ( 111 ) 在此基础上，提出了基于表面结构单元模型的[ 001 ]晶带和[ - 110 ]晶带表面能的经验计算公式。公式计算结果和采用分子动力学模拟结果一致。
To overcome the difficulty in chassis modeling , the fixed interface mode synthesize super - element method is used . two kinds of high - speed elastic chassis models are constructed to continue the exact analysis of the single chassis suspension system 为了能够进行三维单转向架系统的分析,本文采用固定界面模态综合超单元方法,建立了两种基于复杂弹性结构的转向架超单元模型。
This dissertation includes the following parts : 1 . based on the facet model , a method of the simulating of spaceborne sar raw target dates with random distribution is proposed . the simulating algorithm is given and the results are analyzed 本文对星载sar原始回波数据模拟方法进行了研究,主要内容包括: 1 .基于小平面单元模型,给出了一种模拟满足随机分布特性的星载sar目标原始数据的方法。
Compared with the beam model , the shell - spring model proposed in this paper can examine the failure mode of a buried pipeline under the fault movement more clearly . the occurrence of the third damage in thames water pipeline is specially discussed in chapter 3 在模拟土耳其地震大口径钢管的震害中，本文壳模型的分析结果与eidinger的梁单元模型比较，可以更清楚地解释管子第三处破坏产生的原因。
In chapter 2 , different pixel structures , including passive and active pixel structure , and all kinds " of noise in image sensors are introduced . in chapter 3 , circuits operating principle , design and " simulation of the sensor are introduced 第三章主要介绍了本设计中的256光电管阵列四象限光电传感器感光单元模型建立，各个模块的电路设计和仿真，同时也对电’路的具体工作原理和方式进行了详细的介绍。
Based on a discussion of some key problems in structural design , such as the constitutive relationship , element model , crack model , material strength , and load determination , the calculation principle , which should be followed in hydraulic structure design with rcfem , is presented 通过对本构关系、单元模型、裂缝模型、材料强度和荷载取值等关键问题的讨论，提出了应用钢筋混凝土有限元法进行水工结构设计时应遵循的计算原则。
Based on the idea of unit model , the theory of water balance , and hydro - system identification method , the adaptive system identification unit model ( asiu ) , which has been applied and checked up in the tarim river basin , has been put forward in the paper 摘要针对复杂流域水资源变化模拟这一难点问题，基于单元模型思想，依据水量平衡原理，采用水文系统识别方法，提出了自适应系统识别单元模型( asiu ) ，并在塔里木河流域进行应用检验。
Abstract : this paper introduces the calculating methods , develops procedures in the research of the slip and lift displacement on the composite beam of steel and concrete , which lay foundation for the design of the composite beams 文摘:介绍钢与混凝土组合梁计算分析方法，建立其分析单元模型，研制计算分析程序，研究钢与混凝土组合梁交接面的滑移、竖向掀起位移及连接件刚度变化对其影响等工作性能，为钢与混凝土组合梁设计提供理论依据
( 3 ) the method to compose the earth , reinforcement , facing units to reinforced earth fea modal is analysed , then the advantages and disadvantages of different modals that simulate the reciprocity between the earth and reinforcement used in the reinforced earth fea modal are discussed ( 3 )分析总结了将加筋、土体、面板等的有限元模型合成为加筋土有限元模型的方法,分析总结了整体式、分离式、组合式及筋土单元模型等加筋土的筋土间相互作用的优点与缺点。
