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It will expose the design problem of maintainability of civil airplane to the early stage of design. This paper discusses the composing of the virtual maintenance environment, builds non-immersion virtual maintenance environment of undercarriage, and establishes a part library management system. The characteristic of maintainability models and maintainability analysis based on virtual technique is researched to give the maintainability frame model of civil airplane virtual maintainability analysis. All levels of maintenance time model and maintenance man-hour model are established. Analog-Huffman code is proposed to optimize space partition method in traditional collision detection arithmetic."Maintenance therblig"is brought into the broken down of maintenance tasks, and the new maintenance tasks broken down method is proposed. The demands of human measure, position, and equipment layout in human engineering are discussed, and the verification methods of human measure, position and equipment layout in virtual maintenance are given. Basic principle and verification procedure of maintainability virtual verification is developed primarily, and the reachablity, the visibility, and posture-comfortability are verified.

本文论述了虚拟维修环境的组成，构建了某型飞机主起落架非沉浸式虚拟维修环境，建立了维修对象的零件库管理系统；研究了基于虚拟技术的维修性模型特点及维修性分析流程，给出了基于虚拟技术的民机维修性分析框架模型，并结合传统维修性模型，建立了各级维修时间模型和维修工时模型；提出类HUFFMAN编码，结合人因工程的要求，优化了传统碰撞检测算法中的空间分割法，使之适用于柔体；在维修性分解中引入"维修动素"，给出了与CATIA、DELMIA等应用软件结合紧密的维修任务分解方法；论述了人因工程中对人体尺寸、姿势、设备布局的要求，给出了虚拟维修中人体尺寸、姿势分析、民机内设备布局的验证方法；初步制订了维修性虚拟验证的基本原则和验证程序，并结合具体实例对可达性、可视性、干涉性以及人体姿态舒适性进行了验证，较清晰、真实地反映了维修人员的维修状态。

Accident tree analysis is applied to risk analysis and a mathematical model is established, including fire model, effective release rate model, heat intensity threshold and hazard area equation.

采用事件树分析法进行风险分析并建立了数学模型，包括火灾模型、有效释放率模型、热强度极限值、危险区域等式四部分。

After work out the parameters of the dynamic model, the simulation model of the system has been set up in similink system. Run the simulation model and gain the corresponding results. Some characteristics of the permanent thulium gear transmission system have been studied by analyzing the simulation results.

计算出动力学模型中的相关参数后，在similink环境中建立了系统仿真模型并得出相应的仿真结果，通过分析比较仿真结果，了解永磁齿轮传动系统的部分动态特性。

He modeling is the thin walled column model in which the shear walls connected each other in horizontal are regarded as a thin walled column, and the part between openings in vertical are regarded as a tie beam. The programs based on this kind of model is TAT. Two kinds of super element generalized- wall-element and elastic-slab-element are defined, which are condensed from shell element based on the theory of sub-structure, SATWE is based on the model.

AT采用薄壁柱模型，将同一层彼此相连的剪力墙墙肢作为一个薄壁杆件单元，把上下层剪力墙洞口间的部分作为连系梁单元；SATWE引入两种超单元：通用墙元和弹性楼板单元，采用子结构理论用在壳元基础上凝聚而成的墙元模拟剪力墙。

This tiny model of a Sherline Model 5400 milling machine took top honors in the at the North American Model Engineering Society Expo held in Toledo, Ohio in April.

这个小模型一sherline模型5400铣床了最高荣誉在的在北美模式工程学会举行的世博会在托莱多，俄亥俄州在四月。

From the lifespan of relay point of view, a reliability criterion was provided based on dynamic characteristics of anti-forces. Mathematical model of tolerance design with reliability was set up under usage of "stress-strength interference method", taken some critical dynamic characteristics as identification objects such beginning of contact separation speed, speed of collision and gag bit impact velocity. This model showed that lower values of characteristic parameters center and quantitative descriptively relationship between tolerance and product reliability. Multi-objective optimization model of relay tolerance distribution was completed when some factors such as reliability, processing costs and its feasibility into consideration. Based on Analytic Hierarchy Process to determine weight coefficients of various objectives, and usage of simulated annealing, this study performed optimal reliable tolerance allocation of space electromagnetic relay, and then key technology segments were analyzed, accompanying its course measured by controlling chart.

从继电器电寿命的角度，基于动态吸反力特性的配合提出了继电器的可靠性判别准则；在此基础上以触点分离初速度、触点碰撞速度以及衔铁碰撞速度等关键动态特性为判别对象，采用"应力-强度干涉法"建立了继电器可靠性容差设计数学模型，给出了下位特性参数中心值及其容差与产品可靠度之间的定量描述关系；综合考虑可靠度、加工成本及加工可行性等因素建立了继电器容差分配的多目标优化模型，基于层次分析法确定了各目标的权重系数，并采用模拟退火法实现了航天电磁继电器的可靠性容差最优分配；研究了继电器的关键工艺环节，并通过控制图对其过程能力进行了分析。

Secondly,as an application ofφ-mapping topological current the-ory,the vortices in TDGL model have been studied.Some importantartificial hyperthesises in other theories have been changed into naturalresults ofφ-mapping topological current theory.The inner structureof vortices system in the TDGL model has been obtained in terms oforder parameter field.For the first time,the branch process of thevortex system in the TDGL model have been discussed.

其次，作为Ф-映射拓扑流理论的重要应用，本文研究了TDGL模型的vortex动力学，对过去该模型中的一些人为假设给予了合理而严格的理论基础，用序参数的Hopf指数和Srouwer度表征了拓扑荷，建立了该系统拓扑性质的新理论，并首次探讨了TDGL模型中的vortex的分岔过程。

Results The factors into the multiple regression model of physical fatigue include character and emotion.The factors into the multiple regression model of mental fatigue include obsession.The factors into the multiple regression model of total fatigue include character and emotion.

结果 进入躯体疲劳多元逐步回归模型的因素有性格和情绪，进入脑力疲劳多元逐步回归模型的因素有强迫症，进入疲劳总分多元逐步回归模型的因素有情绪和性格。

It has selected for using the total mark method with long step of turning into in emulation , and it is analyzed and starts with mechanism, carried on rational simplifying to the model , reduces the model calculate time , thus it improves the practicability of the model.

仿真中选用了变步长的积分方法，并从机理分析入手，对模型进行了合理的简化，使得模型计算时间大大缩短，从而提高了模型的实用性。

The model also holds the state of your application's universe at the present moment,but is totally disconnected from an notion of aUI.2A set of views,which describe how to render some portion of the model as avisible UI,but otherwise contain no logic.3A set of controllers,which handle incoming requests,perform operations on the model,and choose aview to render back to the user.

在银行系统中，对象就应该包括"银行账户"、"信贷限额"；操作可能包括"资金转账"；业务逻辑应该是"一个账户转账金额不能超过信贷限额"2View，描述了如何把Model数据呈现为可视的UI，没有任何的业务逻辑。3Controllasp neter，处理进来的用户请求，对Model数据执行相应的操作，选择呈现哪一个视图给用户。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。