【正文】 分類號(hào) V22 編 號(hào) U D C 621TH12 密 級(jí) 公 開 中國(guó)民航飛行學(xué)院畢業(yè)設(shè)計(jì)（論文）題 目 基于CATIA的大型飛機(jī)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(dòng)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(huì)主任 評(píng) 閱 人 2012年6月12日I中國(guó)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(jī)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(jī)起落架的發(fā)展歷史、收放系統(tǒng)及各種結(jié)構(gòu)形式，簡(jiǎn)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(diǎn)、應(yīng)用、基本操作、各種工作界面、零部件設(shè)計(jì)、裝配設(shè)計(jì)、運(yùn)動(dòng)仿真、及較高層次的應(yīng)用。在進(jìn)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)。然后進(jìn)行簡(jiǎn)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(jī)輪等部分。確定每一部分的具體數(shù)據(jù)，連接形式，以及運(yùn)動(dòng)方式。然后從草圖工作臺(tái)入手，對(duì)各個(gè)部分進(jìn)行零部件設(shè)計(jì)及建模，并且展示出建模步驟。然后將各個(gè)部件導(dǎo)入裝配設(shè)計(jì)工作臺(tái)，進(jìn)行組裝，添加結(jié)構(gòu)約束。下一步對(duì)組裝好的部件進(jìn)行接合，進(jìn)行數(shù)字樣機(jī)收放演示。在本文的最后，總結(jié)各種不足和待改進(jìn)之處，并且對(duì)CATIA建模的優(yōu)缺點(diǎn)進(jìn)行總結(jié)及展望。關(guān)鍵詞：起落架，CATIA，結(jié)構(gòu)設(shè)計(jì)，數(shù)字樣機(jī)中國(guó)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(guó)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(guó)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 the economy of the aircraft. And the reliability of the landing gear is by its original design program of the science and engineering analysis. So it is a great significance to research the modeling of the landing gear. This report start at civil aviation maintenance engineering professional characteristics, and bining with 3D technology through to the landing gear of the modeling and finite element analysis, simulation the stress of the landing gear in the real situation, estimated the failure, loading of the important parts such as hydraulic ponents. It plays a vital significance to fault prediction of aircraft structure. The history of CATIACATIA started as an inhouse development in 1977 by French aircraft manufacturer Avions Marcel Dassault, at that time customer of the CAD/CAM CAD software to develop Dassault39。s Mirage fighter jet, then was adopted in the aerospace, automotive, shipbuilding, and other industries.Initially named CATI (Conception Assist233。e Tridimensionnelle Interactive — French for Interactive Aided Threedimensional Design ) — it was renamed CATIA in 1981, when Dassault created a subsidiary to develop and sell the software, and signed a nonexclusive distribution agreement with IBM. In 1984, the Boeing Company chose CATIA V3 as its main 3D CAD tool, being its largest customer. In 1988, CATIA V3 was ported from mainframe puters to UNIX. In 1990, General Dynamics Electric Boat Corp chose CATIA as its main 3D CAD tool, to design the . Navy39。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 f