1、Top-Down Design ToolsManaging Complex AssembliesVictor RemmersHolland Engineering Consultants BVTips & Techniques 2006 PTC2Top-Down Design Philosophy 2006 PTC3Traditional Design Approach“Bottom-Up Design” Design of individual components independent of the assemblyManual approach to ensure that compo
2、nents fit properly and meet the design criteriaComponents and those placed in sub-assemblies are brought together to develop the top-level assembly Errors are manually identified and modifications to each component are made to make the adjustment. As assembly grows, detecting these inconsistencies a
3、nd correcting them can consume a considerable amount of time 2006 PTC4Possible example Bottom Up?Mate 2006 PTC5Top-Down Design Philosophy“Top-Down Design” Method of placing critical information in a high-level locationCommunicating that information to the lower levels of the product structure Captur
4、ing the overall design information in one centralized location 2006 PTC6A more integrated approach. 2006 PTC7Top Down Design Stages It is a concept.6-Stage Process1.Conceptual Engineering PhaseLayouts and Engineering Notebook2.Preliminary Product Structure Phase Pro/INTRALINK, Model Tree3.Capturing
5、Design Intent Phase Skeleton Models4.Manage Interdependencies PhaseReference Viewer & Reference Graph5.Communication of Design Intent Phase Copy Geoms, Publish Geoms & Shrinkwrap6.Population of the Assembly PhaseAutomatic Component Constraints & Component Interfaces 2006 PTC8The Bobcat example 2006
6、PTC9Conceptual Engineering PhaseLayouts and Engineering NotebookUnderstand Existing SituationHigh-level RequirementsSpace AllocationDefine New Space and Motion2D Sketches3D ModelsRapid Iteration & ConvergenceAnimationsCapture Key Design IntentParametersNotesSpreadsheetsProprietary DataStage 1 2006 P
7、TC10Preliminary Product Structure Phase Pro/INTRALINK, Model TreeQuickly define product hierarchyBefore any of the components geometry is definedIntuitive, automatic mapping to “start models”Templates ensure all designs share the necessary common elements such as layers, views & parametersFoundation
8、 for efficient task distributionAssembly Population EnvironmentsPro/E menus and Model Tree pop-up menus Pro/INTRALINK and PDMLinkComponent Creation MethodsEmpty Components; Copy from start modelsAutomatic assembly of default datumsUnplaced, Partially- & Over-Constrained ComponentsStage 2 2006 PTC11C
9、apturing Design Intent Phase Skeleton ModelsWhat needs to happen?Capture conceptual design parameters within the context of the assemblyCapture & control critical object interfaces in a single, convenient locationHow? Skeleton ModelsCentralized pathway for communicationFacilitate task distributionPr
10、omote well-organized design environmentsEnable faster, more efficient propagation of changeSpecial Treatment in BOMs, Simplified Reps, Drawings, Model Tree & Mass Property CalculationsUniquely supported Scope Control SettingStage 3 2006 PTC12Manage Interdependencies PhaseReference Viewer & Reference
11、 GraphStage 4Tools to Manage ReferencesExternal Reference ControlEnsures Top-Down Design methodology is followedIncorporate design management rules directly into the designEnsures proper design reusePro/INTRALINKModel TreeGlobal Reference ViewerReference Graph 2006 PTC13Communication of Design Inten
12、t Phase Publish Geoms, Copy Geoms & InheritancePublish Geometry FeaturesProvides ability to pre-determine the geometry to be referenced by a Copy Geometry featureAllows designers to define their interfaces to the rest of the designCopy Geometry FeaturesAllows copying of all types of geometrySurfaces
13、, edges, curves, datums, quilts, copy/publish geometryRetains copied geometry name and layer settingsDependency on parent geometry can be toggledCan be “Externalized”External Copy GeometryBuild relationships on external models independent of an assemblyUseful for coordinate system assembly practices
14、Inheritance Inherit model geometry for one-way associativityShrinkwrap (included in Foundation Advantage Package)Stage 5 2006 PTC14Population of the Assembly PhaseAutomatic Component Constraints & Component InterfacesStage 6What tools are available for populating the assembly?Assembly ToolsDrag & Dr
15、op PlacementComponent InterfacesComponent CreationWithin the context of the assemblyMirror Parts or Subassemblies 2006 PTC15How does Top Down Design relate to company goals?Four Goals from Upper Management1) Cycle Time Reduction.2) Increase User Satisfaction with Software.3) Margin Increase.4) Cost
16、Reduction. 2006 PTC16Why should you use it?Benefits: Reduced design time Reduced errors (right the first time) Increased quality Better project management visibility Concurrent engineering Confidence in top-level regeneration Knowledge of how modules interface Top-level change control 2006 PTC17Exam
17、ple: to design an alternator.What information should a designer need to work with most times? Complete Top-Level Assembly540 MBAll Skeleton Models in Top-Level Assembly70 MBNeighboring Subassemblies320MBSubassembly, with Skeleton Model containing all required information 20 MB 2006 PTC18What does an
18、 example look like?Three PhasesPro/INTRALINKPro/CONCEPTISDX Pro/ENGINEERPro/NOTEBOOKCONCEPTUAL DESIGNCAPTURE DESIGN CRITERIADETAILED DESIGN 2006 PTC19Product Definition 2006 PTC20Product Definition: Engineering LayoutWhat it is: First thing done in design cycleWhat it is Not: Used to evaluate key in
19、terface points Used to evaluate key components of project Three dimensional solids Fully detailed 2006 PTC21Advantages of Using a LayoutDocument design information in one centralized locationDocument design information before creating solid modelsInvestigate design options without involving the enti
20、re assemblyEasily make design changes because all of the design information is contained in one location 2006 PTC22#2 Product Definition: Assembly Structure What it is: Virtual Assembly / BOM What it is Not: Used to organize assembly & assigning of design tasks Used to input non-geometrical data up-
21、front Three dimensional solids Fully detailed Fully constrained 2006 PTC23Advantages of Defining Preliminary Product StructureDefining the product structure prior to defining geometry can assist you in organizing the assembly into manageable tasks that can be assigned to design teams or individual d
22、esigners.Associate specific library parts (that are to be used on the project) with the assembly at the start of the design, preventing confusion later. 2006 PTC24Advantages of Defining Preliminary Product StructureContSubmit the assembly to Pro/INTRALINK or PDMLink and assign models to the appropri
23、ate vaults or folders. Individual designers can focus on specific design tasks instead of on how their design is going to fit into the overall structure.Input non-geometrical information such as the part number, designers name, etc., at a very early stage. 2006 PTC25#3 Product Definition: Skeletons
24、What it is: Zero-mass geometry What it is Not: Exact location detail Three dimensional solids Fully detailed Minimized geometric detail 2006 PTC26And Definitely Not This! 2006 PTC27Advantages of Using SkeletonsProvides a centralized location for design dataSimplifies assembly creation / visualizatio
25、nAids in assembling mechanismsMinimizes unwanted parent-child relationshipsAllows you to assemble components in any orderControls propagation of external references 2006 PTC28 Central source for informationBenefits of Communicating Information From a Central SourceTask distributionConcurrent Modelin
26、gManaging External References ToolsDeclarationPublish GeometryCopy Geometry 2006 PTC29HierarchyTop_level.asmTop_level_skeleton.prtSub_assy_1.asmSub_assy_1_skeleton.prtSub_assy_2.asmSub_assy_2_skeleton.prt Sub_assy_x.asmSub_assy_x_skeleton.prt 2006 PTC303D Design Finally!The foundation is set but top
27、ologically modifiable its time for 3D.With Reference Control Manager, you are safe to create your parts directly in the assembly. 2006 PTC31More Than Meets The Eye!Interchangeability:Family of TablesInterchange AssemblyLayout Declarations 2006 PTC32Power of Top-Down DesignTo Achieve Advanced Automat
28、ion, consider using:RelationsPro/Program 2006 PTC33Miscellaneous TipsSeparate Part Versus Assembly for Skeleton FeaturesAvoid constructing assembly-level skeleton features since the system requires that you perform all edits of these features in Assembly mode. The components can become an obstructio
29、n and degrade performance. Furthermore, you cannot easily reuse skeleton features at the assembly level in other subassemblies. By using a separate part file, you can edit the feature in Part Mode and reassemble it into many different assemblies.Geometry FeaturesPlace all static information in a ske
30、leton as early as possible and place all dynamic information later in the design process cycle. 2006 PTC34Miscellaneous TipsDatums for Skeleton ModelsConsider renaming skeleton datums to “sk_”VisualizationUse simplified reps and transparency prolifically to make viewing easierUse “display states” to
31、 highlight different items at different timesUse surfaces to clarify meaning of centerlines & axesConceptualizationDont be afraid to use simple hand sketches before delving into complex situations its NOT illegal 2006 PTC35Pro/E Wildfire EnhancementsHigh-performance Assembly ModelingLightweight Comp
32、onentsRepresent common components with lightweight graphics for optimum display speedAccurate mass properties and BOMsCustomizable symbolic representationsFlexible Components Represent multiple states of a single component in an assembly Addresses critical need for consistency between BOM and assemb
33、ly model Intelligent RegenerationAssembly regeneration is up to 80% Faster! 2006 PTC36Highlights of Top-Down DesignCapture knowledge, or design intent, allowing you to concentrate on significant issues by making the software perform tedious, repetitive calculations.Enable the framework for interchan
34、geability of components allowing for high-velocity product development by supporting rapid iterations of product variations.Create a concurrent design environment by spreading project design responsibility across many organizational levels. 2006 PTC37New in Advanced Assembly in Wildfire 3.0Data Shar
35、ing DashboardThe Data Sharing dashboard consolidates the Merge, Cutout, and Inheritance features in a modern user interface. Enhancements to Data Sharing features in a new dashboard offer many benefits:Allows changing of multiple feature types at any point Offers a user-friendly user interface with
36、easy access to commands Supports object-action workflow for increased productivityConsolidates Data Sharing features, such as Merge, Cutout, and Inheritance 2006 PTC38New in Advanced Assembly in Wildfire 3.0 (#2)Top-Down Design with Mechanism AssembliesYou can now design a skeleton model that includ
37、es motion.Motion skeletons are available in Assembly, allowing motion to be incorporated into the model at the beginning of the design process. There is no longer a need to recreate an assembly to include a mechanism analysis.You can create mechanism bodies and connections as a motion skeleton, then
38、 run a simple kinematic analysis to ensure that the skeleton provides the appropriate degrees of freedom. You can then create and assemble components to the motion skeleton. Motion skeletons are defined in the same way as normal assembly skeletons and include reference control settings. They do not appear in the assembly bill of materials. 2006 PTC39POWER OF TOP DOWN DESIGN!
