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V5 Surface DesignCATIA V5 TrainingFoilsCopyright DASSAULT SYSTEMESCATIA V5 SurfaceDesignVersion 5 Release 19August 2008EDU CAT EN V5S FI V5R19Instructor Notes:Copyright DASSAULT SYSTEMES1

V5 Surface DesignCase StudyThe case study for this lesson is to understandhow to access Surface Design workbench and tomanage few basic tools.Design IntentGet familiar with the user interface.Create separate containers for Surfaces,Wireframes and Operations for different partsof the Aircraft.Finally Group the features from eachGeometrical Set ( which are referred in themodel ), thus minimizing the tree length of thetree.Copyright DASSAULT SYSTEMESStages in the Process1. Access the Generative Shape Designworkbench.2. Scan the model to better understand themodeling sequence.3. Create the Geometrical Sets.4. Group the features.Instructor Notes: Speech:Discuss the case study concept.The case studies, as well as other exercises in the course do not necessary reflect realworld examples. They are created to demonstrate the many tools CATIA has to offer.Discuss the design intent concept.This lesson does not have a required design intent but there are still skills that shouldhave been learned by the end of this lesson.Discuss the concept of stages in the process.The linear steps described in the stages of the process are not hard fast design rules forthe most part. In the particular examples used in the lessons, it is one possible way ofcreating the geometry.%Copyright DASSAULT SYSTEMES3

V5 Surface DesignStep 1: Introduction to Generative Shape DesignIn this section you will learn how to access theGenerative Shape Design workbench andbecome familiar with its various tools andterminologies.Use the following steps:Introduction toGenerative ShapeDesign2.Managing Features in theSpecification TreeCopyright DASSAULT SYSTEMES1.Instructor Notes: Speech:Introduce the step%Copyright DASSAULT SYSTEMES4

V5 Surface DesignIntroduction to Surface DesignComplex 3D shapes based on Wireframe and Surface geometries from which solids canbe derived:Surface GeometrySolid GeometryCopyright DASSAULT SYSTEMESWireframe GeometryInstructor Notes: Speech:Objective of the slide: tell what GSD can doA. GSD offers tools necessary to create shapes complex 3D shapes composed ofWireframe and surfaces geometriesB. GSD Part Design integrated: complete set of modeling capabilities to fully capturethe design intent of what you want to doThe feature-based approach in GSD workbench offers a productive and intuitive designenvironment to capture and re-use design methodologies and specifications.%Copyright DASSAULT SYSTEMES5

V5 Surface DesignThe Generative Shape Design Workbench (GSD)- Comprehensive set of tools:Basic wireframe and surface featuresAdvanced mechanical surfaces- Easily handled workbench :beginners quickly create simple featuresCopyright DASSAULT SYSTEMES- Specifications captured in a tree:Parent-children relationships createdGeometry modificationsInput replacementBEWARE: Links creation possibility to generate loops and to get lost in the model specificationsInstructor Notes: Speech:Objective of the slide: Gives some characteristics of the workbenchAs seen on the slide: GSD perfect to design the plastic partsBUT not only: can be involved in all industries and goods typeOther characteristic:- GSD offers complete set of tools to create mechanical surfaces and so is adapted toadvanced shape designers- But GSD remains easy to use :- because philosophy of the tools not very different from PDG toolsFor those who come from part design: GSD is easy to handle- specifications of what you do is transparently captured during yourwork: feel like you are designing explicit shapesBUT: beware: GSD creates ASSOCIATIVE surfaces and curvesData organization very important to avoid loopsSO NOT TO FORGET: easy to create things in GSD but:- Everything is capturedcan lead to heavy modelscan lead to unnecessary complicated datatricky situations in the parent-children relationshipinside the part%Copyright DASSAULT SYSTEMES6

V5 Surface DesignCopyright DASSAULT SYSTEMESGenerative Surface Design Access and InterfaceAccessing the Generative Shape Design WorkbenchGenerative Shape Design Workbench TerminologyLet us discover the GSD interface(GSD Interface.CATPart)Instructor Notes: Speech:Now that we have quickly seen what the workbench is made forWe are going to see how to access it and we are going to briefly view its interface% Show:Open the part- About the tree: we see different containersExplain that we will see this a little later in the lesson but briefly say that here we havewhat we call “geometrical sets”- Talk about stacking commands (important in GSD) : demonstrate with simple entitycreation- Explain the toolbars%Copyright DASSAULT SYSTEMES7

V5 Surface DesignSurface Design Workbench General Process (1/2)Generative Shape Design (GSD) plays an important role in the process of Forward and ReverseEngineering in a product design cycle.PhysicalPrototypeImagine & ShapeExternalSystemsQuick SurfaceReconstructionMulti-CAD ModelGenerativeShape Design(GSD)Copyright DASSAULT SYSTEMESSimpleConceptualModelingSketch TracerFreestyleInstructor Notes: Speech:Explain that all the simple and complex shapes can be easily modeled in Generativeshape design workbench. The workbench facilitates the design of shapes through theprocess of forward engineering or reverse engineering. GSD Workbench in combinationwith workbenches (dedicated for Forward and reverse engineering processes) canproduce feature based and intuitive designs.For example, the designer can quickly design a rough shape or concept in Imagine andShape workbench and then shift to Generative shape design workbench to constructsurfaces either by extracting or creating new associative surfaces.The Input can be in the form a conceptual renderings from a stylist or a photograph,which can be placed in Freestyle workbench (FSK) workbench.GSD and FSS workbench can be used to trace out all the curves in the photographs andsurfaces can be generated.Or the Designer may get a reverse engineered data like scans, point cloud data byscanning a physical prototype, then the scanned data is analyzed in Quick surfacereconstruction and Digitized shape editor and then GSD can be used to createassociative surfaces.Different companies may be involved in the development of a product which may beusing different CAD platforms other than V5, in such cases designer can import this multiCAD data in V5 to construct surfaces in GSD.%Copyright DASSAULT SYSTEMES8

V5 Surface DesignSurface Design Workbench General Process (2/2)1Use the following general steps while creatinga surface-based feature:2Access the Generative Surface Designworkbench.Create the Wireframe geometry.Create the Surface geometry.Trim and join the body surfaces.Access the Part Design workbench.Create a part body.Modify the geometry as needed.3475Copyright DASSAULT SYSTEMES6Instructor Notes: Speech:Classical process that will be used during this course%Copyright DASSAULT SYSTEMES9

V5 Surface DesignStep 2: Managing Features in Specification TreeIn this section, you will learn in detail abouttools to manage features in GSD workbench.Use the following steps:1. Introduction to Generative ShapeDesignCopyright DASSAULT SYSTEMES2.Managing Features inSpecification TreeInstructor Notes: Speech:Introduce the step%Copyright DASSAULT SYSTEMES10

V5 Surface DesignManaging Features and Geometrical SetsAs you build complex geometries, management of yourmodel becomes important. A good structured model,with logical grouping of geometries gives a betterunderstanding of the design process.An organized model has the following advantages:A.Copyright DASSAULT SYSTEMESB.C.D.Related geometries are clubbed together in (to)groups or setsReduce the size of the Specification treeIt is easier to reorder and replace featuresThe root cause of the problem can be easilyidentified.Instructor Notes: Speech:Here we talk about the importance of managing the GSD containers:- Complex geometryNeed to structure features in a logical way to be able to:Better understand the design process of the part: we have seen that the specificationswere captured to be able to come back later on a parent feature: the better the model isorganized, the easier it will be to find the right feature to manipulate and to understandthe impacts of this manipulationPart readability by reducing tree size%Copyright DASSAULT SYSTEMES11

V5 Surface DesignGeometrical SetsGeometrical set (GS): default container forwireframe and surface elements.In a Geometrical Set, the order is not importantB.Geometrical Set enables to organize thespecification treeC.As many Geometrical Sets as needed can beadded to the model.Copyright DASSAULT SYSTEMESA.Let us discover the manipulations ongeometrical sets (GSD Interface.CATPart)Instructor Notes: Speech:Here we see what is a geometrical set and how it behaves:First: beware when you use a geometrical set because the features are not displayedaccording to the update logical order. It just “contains” features.Some specificities of the GS:A. You can put any surface element you wish in the geometrical set and they need notbe in a structured logical way. The order of these elements is not important as theiraccess and their visualization is managed independently without any rule.SO: In a GS, a child feature can exist or can be reordered before the parent feature.B. gather various features in a same set or sub-sets and organize the specification tree.C. For example, one GS can be dedicated to contain only wireframes while the other cancontain surfaces.% Show:Briefly Demonstrate that you can add many GS and that you can create GS in existingGSDemonstrate the manipulations that can be done on a GS (reorder, insert ) and saythat more detail is available in the book%Copyright DASSAULT SYSTEMES12

V5 Surface DesignOrdered Geometrical setsAn Ordered Geometrical Set (OGS) isa Geometrical Set in which theupdate order is taken into accountto order the features.Copyright DASSAULT SYSTEMESDefine in work objectis possibleLet us discover the OGS behavior(OGS.CATPart)Instructor Notes: Speech:Create geometry with history features you create have parentsorder in the geometries that are created with GSD.there’s an updateIn a OGS: the order of the features must respect this update order.For instance: I cannot place a point before a plane in the tree if the point is placed on theplane because the plane is the parent of the point.OGS are equivalent to part design bodiesAnd so (like in bodies): features can be defined in work objectthe design process of a partOGS help understandAnother characteristic of the OGS:Creation features create a new object in the tree and modification features create a newstate in an existing object as well as absorb the preceding state(s).Absorbed features are no longer visible nor accessible, as if ''masked''by their absorbingfeature. State that in the example above, Sweep.1 is used to create Join.1 gets absorbedin it. % Show:Use part OGS with already created geometry and show the define in work object andalso the impossibility to reorder as you want. Show the scan and what it does when youexit the scan (compare OGS and GS)%Copyright DASSAULT SYSTEMES13

V5 Surface DesignGeometrical Set Vs Ordered Geometrical SetCopyright DASSAULT SYSTEMESSr.No.Geometrical Sets (GS)Ordered Geometrical Sets (OGS)1Elements in this set can be shuffled irrespective oftheir sequence of creation.Elements in this set maintain the linearity withrespect to their order of creation.2The parent element in this set is not absorbed afterany operation. Hence an element can be used &reused at different levels.The parent in this set is absorbed after performingan operation and cannot be reused again.3Features in this set cannot be set as “in workobject”Any feature in this set can be set as “in workobject” and the features located after it are neitheraccessible nor visible.4Maintains better flexibility.Maintains better linearity for understanding thedesign flow.5Geometrical Sets cannot be converted to OrderedGeometrical Sets.Ordered Geometrical Sets can be converted toGeometrical sets.6Two or more features can be grouped to form a“Grouped Geometrical Set”.Ordered Geometrical Sets cannot be grouped.It is recommended to use OGS when you want to maintain linearity in your model.Use Geometrical Sets if you want to design a model with the existing surfaces.Instructor Notes: Speech:To recap what we have seen and what you have manipulated in the previous exerciseOGS helps to maintain parent children relationships, but prevents re-using creationfeaturesYou can reorder the features in the OGS only by respecting parent child relationsGS helps to re-use creation features but scanning of the part is not possible. %Copyright DASSAULT SYSTEMES14

V5 Surface DesignHybrid DesignHybrid Design provides you with a high degree offlexibility while structuring the design.Generative Shape Design (GSD) features available in the partdesign stacking commandsCopyright DASSAULT SYSTEMESHybrid: Wireframe/surface features integration in update cycle of the body:Better understanding of the partUseful when the design is a close mix of both solids and surfacesNon Hybrid: Allows you to efficiently sort out the solid:Useful when the surfaces and wireframe are a preliminary design to the solid but are notintegrated to the solid conceptionAllows you to efficiently manipulate (hide/show) objects which are not solid, and that too with lessnumber of clicks.Instructor Notes: Speech:Explain to students that they have the possibility to mix solid and ordered surfacesfeatures if they choose to work in hybrid mode in GSD.HYBRID CONTAINER:- the bodies ARE by default the containers that will welcome the solids and the surfaces(as seen on the picture).- the container can be an OGS if you insert it at startupbody (not possible if non hybrid mode)%Copyright DASSAULT SYSTEMESthe OGS is then inserted in the15

V5 Surface DesignTo Sum UpCopyright DASSAULT SYSTEMESIn the following slides you will find a summary of the topics covered in this lesson.Instructor Notes:Copyright DASSAULT SYSTEMES16

V5 Surface DesignIntroduction to Generative Shape DesignGenerative Shape Design workbench allows you todefine models with complex shapes usingwireframe and surface geometry. Surfacegeometry may be integrated into the solid model tocapture its design intent.Use the following general steps while creating asurface-based feature:Surface GeometrySolid GeometryCopyright DASSAULT SYSTEMESAccess the Generative Surface Design workbench.Create the Wireframe geometry.Create the Surface geometry.Trim and join the body surfaces.Access the Part Design workbench.Create a part body.Modify the geometry as needed.Wireframe GeometryInstructor Notes:Copyright DASSAULT SYSTEMES17

V5 Surface DesignManaging Features in Specification TreeCommonly used Feature Management ToolsCopyright DASSAULT SYSTEMESIn complex models, features must be structured ina logical way. It helps in better understanding ofthe designing process and reduction in tree size.Structuring can be done using a Geometrical Setor an Ordered Geometrical Set.Geometrical Set (GS): This is a default containerfor wireframe and surface elements. The featuresare not displayed according to the logical updateorder.Ordered Geometrical Set (OGS): It takes intoaccount the update order of the features. OGS areequivalent to part design bodies.Instructor Notes:Copyright DASSAULT SYSTEMES18

V5 Surface DesignExercises Overview 1A and 1BRecap Exercise / Case StudyExercise 1ACopyright DASSAULT SYSTEMESYou will practice what you have learned by working on two exercisesExercise 1BInstructor Notes: Speech:Present the exerciseHave the students begin the exercise and note the timeAssist students as needed with the exercise1A: reorganize a tree1B: see the characteristics of Ordered Geometrical Sets, see the consequence of usinghybrid modeStudents have 15 minutes%Copyright DASSAULT SYSTEMES19

V5 Surface DesignCase Study: Introduction to Generative Shape DesignIn this exercise, you will practice feature management in thespecification tree and see how to reorganize the specification treewhen it becomes too complex or too long.Open the given part consisting of the ‘Air Craft’ modelin the Generative Shape Design Workbench.Get familiar with the user interface.Study the Surface, Wireframe and Operations.Create separate containers for Surfaces, Wireframesand Operations for different parts of the Aircraft.Finally Group the features from each Geometrical Set( which are often referred in the model ), thusminimizing the tree length.Copyright DASSAULT SYSTEMESUsing the techniques you have learned in this lesson and previous exercises, createthe model without detailed instruction.Instructor Notes: Speech:Present the recap exercise.The same manipulations as before are done except that now, you have less instructionsand the organization that you give to the part will depend on your study of the data.They have 30 minutes to do this.%Copyright DASSAULT SYSTEMES20

V5 Surface DesignExercise 1A: RecapScan the Geometrical setsGroup features into different geometricalsetsCopyright DASSAULT SYSTEMESCreate a Group of Geometrical setsInstructor Notes: Speech:Review the Exercise Recap slides after the students have attempted the exercises. Tryto encourage group discussion on the exercises they have just completed.Discuss the different tools used.% Ask:Ask if there are any questions about this exercise, any difficulties?%Copyright DASSAULT SYSTEMES21

V5 Surface DesignExercise 1B: RecapCopyright DASSAULT SYSTEMESUnderstand the behavior of OGS and GSwhen implied with reorder command.Understand the Parent/Child structure undera Hybrid design environment.Instructor Notes: Speech:Review the Exercise Recap slides after the students have attempted the exercises. Tryto encourage group discussion on the exercises they have just completed.Discuss the different tools used.% Ask:Ask if there are any questions about this exercise, any difficulties?%Copyright DASSAULT SYSTEMES22

V5 Surface DesignCase Study: Introduction to GSD RecapCopyright DASSAULT SYSTEMESOpen the given part consisting of the ‘AirCraft’ model in the Generative Shape DesignWorkbench.Get familiar with the user interface.Study the Surface, Wireframe andOperations.Create separate containers for Surfaces,Wireframes and Operations for differentparts of the Aircraft.Finally Group the features from eachGeometrical Set ( which are often referred inthe model ), thus minimizing the tree length.Instructor Notes: Speech:Recap what has been seen in the lesson:Now they should be familiar with the GSD interface and containers.By now, you have the tools to organize the GSD data correctly and you have the keys tobe able to choose between the different working modes that are proposed (GS, OGS,Hybrid or not)Next lesson: now we can go on and begin to learn how to create geometry%Copyright DASSAULT SYSTEMES23

CATIA is a robust application that enables you to create rich and complex designs. The goal of the course ‘CATIA V5 for Surfaces’ is to teach you how to build basic and advanced surfaces using Generative Shape Design workbench, and how to create a complex