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Enhancing Design Complexity Management September 13, 2000

Enhancing Design Complexity Management September 13, 2000. Benjamin A. Baker, Russell D. Fish and Elaine Cohen. Design Complexity Management Problems. Vast amounts of data involved Difficult to create and visualize complex design frameworks

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Enhancing Design Complexity Management September 13, 2000

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  1. Enhancing Design Complexity ManagementSeptember 13, 2000 Benjamin A. Baker, Russell D. Fish and Elaine Cohen

  2. Design ComplexityManagement Problems • Vast amounts of data involved • Difficult to create and visualize complex design frameworks • Requires automation of complex and time-consuming tasks • Lack of user interfaces that support design complexity management

  3. Three main components: Aggregations Relationships Version objects Decomposition at multiple levels of detail Interactions between components Represents design functionality Simultaneous development and integration Supports analysis and simulation Design alternatives and history Complexity Management Framework

  4. Concurrent Design Views Interface • Box diagram of design framework • Familiar tree view structure • Text based specification • Geometric representation

  5. Aggregations Neighborhood Part Assembly Relationships Interface specification Aggregations & Relationships

  6. Concurrent Design Views Interface Capabilities • Visualization of multiple levels of design detail and complexity • Hierarchical representation of design framework • Rapid navigation of the model hierarchy • Concurrency among design views • Consistent user interface throughout entire development process

  7. No Concurrency May have tools designed for specific tasks Powerful tools that are unable to communicate with each other Re-entry or conversion of data between different tools Concurrent Views Changes made in one view are reflected across all views Allows the designer to perform operations in the most suitable interface Conceptual design creates a usable framework Concurrency Between Views

  8. Incremental Design Example Video FormulaSAE Automobile

  9. Model Specification&Geometric Representation Chassis : { Frame; Wheel; RearSuspension : { SupportMembers; Springs; BearingCarrier; Hub; SupportMembers_Springs_Intfc; SupportMembers_BearingCarrier_Intfc; BearingCarrier_Hub_Intfc; } Brake : { Hat; Rotor; Caliper; Adapter; Hat_Rotor_Intfc; Rotor_Caliper_Intfc; Caliper_Adapter_Intfc; } Frame_RearSuspensionIntfc; RearSuspension_Wheel_Intfc; Brake_RearSuspension_Intfc; }

  10. HeatSlots : seq { “Slots”; CirDia : (Rotor_Hat_Intfc::BoltCirDia + RotorParms::SlotCirOffset); CtrPt : pt (0.0, -RotorParms::SlotCtrRad); CtrCir : circleCtrRad (CtrPt, RotorParms::SlotCirRad); ConstLine1 : linePtAngle(CtrPt, 35.0); Point1 : prIntersectCircleLine(CtrCir, ConstLine1, false); Cir1 :* circleCtrRad (origin, RotorParms::SlotWidth/2.0); Cir2 :* circleCtrRad (Point1, RotorParms::SlotWidth/2.0); Cir3 :* circleRadTan2Circles (RotorParms::SlotCtrArd + RotorParms::SlotWidth/2.0, Cir1, Cir2, true, true, true); Cir4 :* circleRadTan2Circles (RotorParms::SlotCtrRad – RotorParms::Width/2.0, Cir1, Cir2, false, false, true); SlotCrv : outlineCrv (array (Cir1, Cir3, Cir2, CircCCW(Cir4)), false); Slot : profileSize (SlotCrv, “inside”, RotorParms::Thick + 0.1, 0.0, 0.0, 0.0); Anchor1 : rotateAnchor (Prims::Anchor1, 0.0, 0.0, - RotorParms::SlotFrstAng); SlotPattern1 : radialPattern (Anchor1, Slot, RotorParms::SlotNum, (RotorParms::SlotFrstAng+90.0) / RotorParms::SlotNum, CirDia); Anchor2 : rotateAnchor (Anchor1, 0.0, 0.0, 90.0); SlotPattern2 : radialPattern (Anchor2, Slot, RotorParms::SlotNum, (RotorParms::SlotFrstAng+90.0) / RotorParms::SlotNum, CirDia); Slots : entity (mergeShell (SlotPattern1, SlotPatter2); } Brake_RearSuspension_Intfc : intfcSeq { “Include generic link information” joint : ijoint(); pos : intfcPos (baseAnchor, Brake); neg : intfcPos (baseAnchor, RearSuspension); “Identify common dimensions”; CalMountOffset :* (37.5); BrakeEarOffset :* (40.0); “Decompose into interfaces between Adaptor and Bearing Carrier and betweem Brake Hat and Hub”; AdapterAnchor : offsetAnchor (baseAnchor, CalMountOffset, BrakeEarOffset, 0); Adapter_BearingCarrier : intfc (ijoint(), baseAnchor, Adapter, baseAnchor, BearingCarrier); atch1 : partOf (joint, AdaptorAnchor, Adapter_BearingCarrier); BrakeHat_Hub : intfc (ijoint(), baseAnchor, BrakeHat, baseAnchor, BearingCarrier); atch2 : partOf (joint, baseAnchor, BrakeHat_Hub); } Aggregation Specification Example Interface Specification Example

  11. Conclusions • Intuitive user interface increases the utility and ease of use for a powerful complexity management framework • Visual hierarchical decomposition of complex design frameworks • Multiple representations of the design framework • Concurrency between design views is maintained

  12. Future Work • Version objects & design histories • Visual sub-system separation • Commenting of code within objects • Analysis & simulation support with other tools via the user interface

  13. Acknowledgments This work was supported in part by: • NSF Science and Technology Center for Computer Graphics and Scientific Visualization (ASC-89-20219) • DARPA (F33615-96-C-5621)

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