【正文】 performance of the plane, it might require a bigger engine and more fuel not to mention more money. In fact, it was this delicate tugofwar between the extra weight of the gear and the reduced drag that was most important for the overall acceptance of retractable landing gear. Drag increases with speed and therefore reducing drag bees more important as an aircraft39。s Virginia class submarine. In 1992, CADAM was purchased from IBM and the next year CATIA CADAM V4 was published. In 1996, it was ported from one to four Unix operating systems, including IBM AIX, Silicon Graphics IRIX, Sun Microsystems SunOS, and HewlettPackard HPUX.In 1998, V5 was released, which was an entirely rewritten version of CATIA, with support for UNIX, Windows NT and Windows XP since 2001.In 2008, Dassault announced and released CATIA V6. While the server can run on Microsoft Windows, Linux or AIX, client support for any operating system other than Microsoft Windows is dropped.[5] In November 2010, Dassault launched Catia V6R2011x, the latest release of its platform while still continuing to support and improve its Catia V5 software. In June 2011, Dassault launched V6 R2012.Commonly referred to as a 3DProduct Lifecycle Management software suite, CATIA supports multiple stages of product development (CAx), from conceptualization, design (CAD), manufacturing (CAM), and engineering (CAE). CATIA facilitates collaborative engineering across disciplines, including surfacing amp。s Mirage fighter jet, then was adopted in the aerospace, automotive, shipbuilding, and other industries.Initially named CATI (Conception Assist233。在本文的最后，總結(jié)各種不足和待改進之處，并且對CATIA建模的優(yōu)缺點進行總結(jié)及展望。然后將各個部件導(dǎo)入裝配設(shè)計工作臺，進行組裝，添加結(jié)構(gòu)約束。確定每一部分的具體數(shù)據(jù)，連接形式，以及運動方式。在進行三維建模之前，首先，從一些官方數(shù)據(jù)上確定起落架的類型，以及一些基本的數(shù)據(jù)。分類號 V22 編 號 U D C 621TH12 密 級 公 開 中國民航飛行學(xué)院畢業(yè)設(shè)計（論文）題 目 基于CATIA的大型飛機起落架建模與分析 The mercial aircraft landing gear modeling and analysis based on CATIA 作者姓名 專業(yè)名稱 熱能與動力工程 指導(dǎo)教師姓名及職稱 提交日期 2012年 6月 12 日 答辯日期 2012年 6月13 日 答辯委員會主任 評 閱 人 2012年6月12日I中國民航飛行學(xué)院航空工程學(xué)院畢業(yè)論文基于CATIA的大型飛機起落架建模與分析學(xué)生： 指導(dǎo)教師：摘 要本文首先總結(jié)了飛機起落架的發(fā)展歷史、收放系統(tǒng)及各種結(jié)構(gòu)形式，簡單的列舉了一些由起落架故障引發(fā)的事故。然后介紹了下CATIA V5的特點、應(yīng)用、基本操作、各種工作界面、零部件設(shè)計、裝配設(shè)計、運動仿真、及較高層次的應(yīng)用。然后進行簡化，省略掉液壓管、電線、以及剎車等部件，再將其分為外筒、活塞桿、主支柱、斜支柱、輪軸、扭力臂和機輪等部分。然后從草圖工作臺入手，對各個部分進行零部件設(shè)計及建模，并且展示出建模步驟。下一步對組裝好的部件進行接合，進行數(shù)字樣機收放演示。關(guān)鍵詞：起落架，CATIA，結(jié)構(gòu)設(shè)計，數(shù)字樣機中國民航飛行學(xué)院航空工程學(xué)院畢業(yè)論文ABSTRACT The development history of the landing gear and all kinds of structure form and retraction system are summarized. And some accident cause by landing gear are listed. Then the basic knowledge of CATIA V5 as covered, from the application characteristics to its user interface and all kinds of workbench. Before 3D modeling, first of all, some official data to determine the type of landing gear is collected, and some basic data is also collected. Then Hubcap, Cylinder, Drag brace, Torque arm, Collar and tire are modeled by simplified. The data of each part of the concrete, connecting forms, and lootion are be corrected. Then from the sketch of the various parts of the parts are modeled. The next step is martialing each parts and DMU. At the last, all kinds of deficiency and stay for improvement are summarized, and the advantages of CATIA modeling are prospected.Key Words: Landing gear, CATIA, structural design, DMU中國民航飛行學(xué)院航空工程學(xué)院畢業(yè)論文ContentChapter 1 Reviews 1 The meaning of this research 1 The history of CATIA 1Chapter2 Overview the landing gear 4 Definition of landing gear 4 Different types of gear 7 Tricycle gear 7 Taildragger 8 Unusual types of gear 9 Landing gear and accidents 12Chapter 3 Introduction about CATIA 14 CATIA’s Interface 14 Mechanical design workbenches 15 The Specification Tree 15 The Sketcher Workbench 16 Part design 18 Assembly Design 18 Generative Part Structural Analysis 19 Parameters and Formulas 20Chapter 4 Modeling process of landing gear 21 Basic structure modeling 21 Main supporting pole 21 Airplane Wheel design 25 Upper Drag Brace 28 Lower Drag Brace 29 Lock assembly 30 Hydraulic shafts 31 Centering Unit steering collar and torque 31 Assembly 33Chapter 5 Digital MockUp 38 Preparation for Digital MockUp 38 Frame Animation 41Chapter 6 Summary 43Reference 44III中國民航飛行學(xué)院航空工程學(xué)院畢業(yè)論文Chapter 1 ReviewsLanding gear is an important part of the plane. It’s the main ponent for the plane on ground parking, rollout, takeoff, and landing. It can load the weight of the plane and absorb impact energy. The plane landing gear major functions for aircraft in the stationary state under the gravity and the impact of the takeoff and landing, controlling the plane on the ground motion. There is a wide range of plane landing gear model, so these cause the landing gear design difficult, processing document plicated, and maintainability low maintenance rate. It cost a long time from modeling to processing cycle, these lead to the descending of the production efficiency. To lifting the plane landing gear parts production efficiency, the project has put forward fast of parameterized modeling and of parameterized modeling can also be used in other parts. CATIA (Computer Aided TriDimensional Interface Application) is the modeling software to build up a threedimensional model of the platform The meaning of this researchThe reliability of the landing gear plays an important role to the safety of the aircraft, the structure and appearance of the landing gear also decides th