CATIA Assy Project s04

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    AE4375-6380 CATIA Assembly Project Spring 2004 Page 1

    GEORGIA INSTITUTE OF TECHNOLOGYSchool of Aerospace Engineering

    Spring 2004

    AE4375-6380 CATIA Assembly Project

    DescriptionThis CATIA project is a direct application of your solid modeling knowledge and skill to a very practicalproblem to develop an assembly model of a device. Traditional 2D drafting is highly developed in itsability to convey the geometry of simple 3D parts and solid models represent a straightforward extension.However, solid models can be highly effective when employed to develop complex assemblies of partsinto a mechanism or a machine of some kind. When 3D parts can be combined and constrained with avariety of rotating, sliding, twisting, etc. joints, this allows a designer to quickly and accurately explore agreater number of design concepts that can be done without CAD.

    For this project, we will build on the basics introduced in the previous lessons. Since much of theexpected learning will occur as you try to work through the details of an assigned project, we are askingyou to break up into teams of 2 persons. This will not only allow you to divide up the workload, but wehope that it will make it easier to figure out together how to carry out certain operations to create aworking assembly model. For this assignment, you should make use of the material weve covered in

    the CATIA workbook, but you will also need to consult the online help information as well. In addition,both the instructor and TA have copies of the advanced workbook that you may borrow for short periodsof time. For this project, your assembly model must demonstrate all normal motion of the assembly withone exception: where a threaded lead screw is specified, you may replace this with a simple axial slidingconstraint (i.e., you do not need to model the individual threads).

    We will have an informal project discussion during the normal class period after the break week, and atthis time we will explain more of the details and requirements and will answer questions.

    Assignment and Submission:

    Assembly project descriptions have been prepared and are provided on the pages that follow. Duringclass on March 18, we will try to define the teams (3 teams in AE4375 and 11 teams in AE6380) andmake the project assignments (by choice or lottery if there are multiple requests for a project). If you arenot present at this class, we will simply assign you to a team and a project. We are also making availablean alternative project definition of your choice. For this option, your team must submit by March 22 abrief description of what kind of assembly you propose to create. For example, you may have an interestin how a helicopter rotor functions, and in this case you might want to propose creating an articulatedrotor model that illustrates the basic functions. You would need to find basic details in the literature andon the web but you would probably need to make lots of assumptions about dimensions because thisinformation is not usually available. Nonetheless, a functional assembly that illustrates the basics wouldmake a great project. Other possibilities are a landing gear (use an existing airplane as the model), ormaybe a simplified model of a turbofan engine. We welcome your inputs.

    The project materials should be submitted in a single file using the zip file format. This file shouldcontain: (1) the CATIA assembly and associated model files ,and (2) a text document with figures todescribe and illustrate what you have done in the project. The zip file should be named uniquely using

    the same format used for the individual assignments but in this case with both last names separated by ahypen.

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    Project: #2

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    Project: #3

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    Project: #4

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    Project: #5

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    Project: #6

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    Project: #7

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    Project: #8

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    Project: #9 (Optional)This particular project is going to be a bit more challenging but you may find it more interesting than theother assemblies. In the following figures you will see a sketch of a 4-blade tail rotor for a CH-54helicopter. Unfortunately, there are no dimensions shown, but the assembly is drawn to scale. For thisproject, you are to create an assembly model of the rotor hub, and you are to include the blade pitchcontrol mechanism. You should model the main shaft and control shaft as simple cylinders and you donot need to model more than the cuff portion of the blades. You are free to choose dimensions that areroughly proportional to the sketch. You can assume that the overall hub is approximately 16 inches (or40 mm) across from cuff to cuff. If you have questions, either the instructor or TA can explain thefunctions of each part.

    If you choose this project, you should disregard the project originally assigned to you and submit #9instead. (You can switch back to the original project at any time.)

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