飞机的

Aerodynamical parameters in longitudinal model of a certain type of aeroplane are identified in the paper.

论文研究了利用参数辨识方法确定飞机纵向运动模型参数的问题，在分析飞机特性的基础上选取了飞机纵向小扰动线性运动状态方程和纵向非线性运动方程作为辨识的模型，以某型飞机飞行试验实测数据为例对其进行数据预处理之后辨识了模型中的气动参数。

3D model may be manipulated so that its shape could be observed from any view, and is displayed on the screen by static state and dynamic. The property of volume and the moment of inertia matrix are obtained from the octree of object by the algorithms presented in this dissertation. To fit the application of recognition, we studies the method by which 3D model octree is used for recognition.

作者研究了对重建飞机三维形体的旋转和操作，提出了飞机体积及惯性矩的计算算法，并利用计算机图形学技术，对重建的飞机三维形体进行了静态和动态显示，论文对重建的飞机三维模型用于识别的方法进行了探索性的研究。

The main jobs of this paper are as followed: 1 The reuse of the frame design technology for aircraft assembly fixtures is researched. a frame line part library is built with the templet driven technology, the reuse of the frame line part come true by the tools for instantiation and instance modification. The design resources are effectively used, some repeating work is cut. 2 Two methods to obtain the assembly feature are proposed: the straight way by the Enumeration method and the indirect way by project features to the assembly plane. All of the assembly features of the frame and the adjustable bearings are obtained by these two methods which makes the frame automatic assembly technology for aircraft assembly fixtures come true. 3 The frame automatic assembly technology aircraft assembly fixtures based on assembly features is researched. A binary tree assembly model is used to express the assembly information of the frame for aircraft assembly fixtures, the automatic assembly between the frame, the aircraft and the adjustable bearing is completed within the three steps: distribute, obtain and evaluate assembly feature. Finally, the efficiency of the frame assembly design is proved. 4The frame interpart modeling technology for aircraft assembly fixtures is researched, the intersection methods are concluded and the arithmetic of the single-cut, double-cut and inter-cut intersection is proposed, the interpart fast modeling of the frame design for aircraft assembly fixture come true. 5Based on the researches mentioned before, a sub-system of frame fast design for aircraft assembly fixture is developed on CATIA. The sub-system is used to design the aircraft assembly fixtures in a large aeronautics corporation and make a good- effect.

论文的主要工作如下： 1研究了飞机装配型架骨架设计重用技术，在总结归纳骨架线框结构类型的基础上，应用模板驱动的方法建立了骨架线框库，通过骨架线框零件的实例化和离线编辑实现骨架线框的重用，有效利用设计资源，减少重复劳动； 2提出穷举几何对象的装配特征直接获取方法，遍历零件模型的几何对象，从中捕捉所需装配特征，该方法简捷、高效；提出向装配面投影的装配特征间接获取方法，该方法在现有特征基础上生成装配特征，解决了部分装配特征难以直接获取的问题； 3研究了基于装配特征的飞机装配型架骨架自动装配技术，采用一种二叉树装配模型表达骨架的装配关系，并通过装配特征的分配、获取和赋值三个步骤，实现了骨架分别与飞机产品和可调支承的自动装配，避免了繁琐的人工交互操作，提高了骨架设计的效率和规范化程度； 4研究了飞机装配型架骨架零件间建模技术，在总结归纳骨架元件相贯处理方式的基础上，提出了骨架元件单剪切相贯、双剪切相贯和互剪切相贯的实现算法，简化了骨架相贯处理的过程； 5基于以上研究，在CATIA平台上开发了飞机装配型架骨架快速设计子系统，并应用于某大型航空企业的装配型架设计，提高了设计效率和设计质量。

The stealth warplane for the microwave radar usually have complicated structures with the coating of wave absorption. On the base of calculation and modeling of the geometrical structure of the warplane in real size, the HF RCS of the air crafts under two different polarizations in different direction have been calculated with the FDTD. The result shows that the above mentioned stealth warplane have the obvious characterstics of frequency resonance, polarization and the relatively large RCS in HF Band 10-30dBm2, which can be used as the theoretical reference for selection of working frequency for sky wave OTH Radar and it also means that the sky wave OTH radar has good capability of anti-stealth targets quantitatively.

对微波雷达具有隐身作用的飞机，其形体较为复杂且表面涂敷有强吸波材料在对一种具有隐身几何外形结构实际尺寸飞机进行计算建模的基础上，文中采用FDTD技术得到了两种极化状态下该飞机无涂敷时不同方向上的短波雷达截面RCS值其结果显示了这种隐身几何外形飞机在短波波段有明显的频率谐振特性、极化特性和较大的RCS10-30dBm2，可为天波超视距雷达在选择工作频率时提供理论参考，并定量地说明天波超视距雷达具有较优的反隐身目标能力

In nearly a dozen deadly accidents then,planes crashed after pilots flouted basic rules, such as by flyinginto violent storms and haphazardly programming autopilots. Then inJune 1994, a China Northwest Airlines plane went down a few minutesafter takeoff from the resort spot of Xi'an , killing all 160aboard.

在那段时期，一连串飞机坠毁事故中都存在飞行员违反基本规定的现象，例如将飞机驶向剧烈风暴地区，或随意设定自动驾驶。1994年6月，中国西北航空公司一架飞机从旅游胜地西安起飞后不久坠毁，机上160人全部丧生。

His company produced 24 new airplanes, Model 40 As, in six months to begin the new service. The Model 40As were open cockpit biplanes with wheels rather than pontoon. They could carry 1,200 pounds of mail. However, tucked away under the wings was a small closed compartment that could carry two very brave passengers. The Model 40 As were the first planes to be used for regular long-distance passenger and mail service.

公司半年制造了24架新型飞机(40A 型)，准备开展这项新业务。40A 型飞机是带有敞开式驾驶舱的双翼飞机，配有轮子，没有浮筒，可装载重达1200磅的邮件，不过，其机翼之下隐藏了一个可容纳两名勇敢乘客的小型封闭舱。40A 型机是最早定期运送长途旅客和用于邮政服务的一批飞机。

The plane and with other WWII-era aircraft, part of the Collings Foundation collection, are touring the country offering rides, and will be in Denton, Arlington, and Dallas, Texas over the next week.

包括这架飞机在内的许多架二战时期飞机都属于柯林斯基金会的收藏。这些飞机将在美国全国作巡回表演，并让人乘坐。下周这些飞机将访问德州的丹顿、阿灵顿和达拉斯。

With about 200 aircraft a day taking off and landing on two runways and using gates at three concourses, the company wanted to make sure that each plane got in and out as quickly as possible, even if it arrived early or late.

这个机场每天都有大约二百驾飞机在两条跑道起飞与降落，并使用三个中央大厅的登机口，西南航班因此想要保证每辆飞机都能尽可能快地降落并起飞，甚至是在飞机早到或晚点地情况下。

A wall heat flux function was introduced to separate the numerical prediction of internal heat transfer in aircraft from that of thermal effects outside the skin.The thermal network method combined with the Monte Carlo method was used to analyze the internal heat transfer and the FLUENT code was employed to simulate the aerodynamic convection outside skin.

引入壁面热流函数，将蒙皮外部热环境与飞机内部换热进行解耦计算，采用热网络法与蒙特卡罗法进行飞机内部传热分析，利用FLUENT软件进行蒙皮外气动对流换热模拟，建立了飞机蒙皮瞬态温度场的数值方法。

He recalled Lt. Roy Russell, who was flying number two wing position in a flight of six when the clouds got so black with rain he lost sight of the lead ship's right wingtip. He drifted slightly left. His left wingtip hit the vertical stabilizer of the lead plane.

他回忆起罗伊·鲁塞尔中尉——罗伊·鲁塞尔中尉的飞机属于一个6机小队，飞机之间距离也就是两机翼，当时进入云层是厚黑型积雨云，中尉看不到带队长机右翼翼梢，飞机稍左偏了偏，左翼翼梢碰到了带队长机垂直平衡翼。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。