Integrated subsystem design Autogenerating EASY5 models from CAD data

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Integrated subsystem design - Auto-generating
EASY5 models from CAD data

• Raju Mattikalli
• Brian Ummel
• Bruce Fritchman

Boeing Mathematics and Computing Technology
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Overview

• Integrated design - information flow
• Subsystem design process today
• KIRTS
• KIRTS-EASY5 proof of concept
• Lessons learnt
• Conclusions, future work

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Information flow during design
Preliminary Design
Detailed Design
Functional Analysis

• Gaps exists
• Tool integration is required
• Need to improve product representation

4
Integrated design

• Requirements -
• Manage change
• Maintain consistency
• Represent system in intermediate states
• Support different views
• Capture product variations
• Concurrent product/process development

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Our context - System (tubing) design
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The process today

• PD
• Architecture
• Functional requirements interfaces
• Schematic
• Analysis, get component requirements
• ID
• Schematic ltgt component catalog
• Analysis ltgt vendor software
• Refine analysis

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The process today (contd.)

• DD
• Physical components for nodes
• Place components in 3D
• Determine interfaces
• Schematic lines to spaghetti tubes
• Route tubes
• Break tubes
• Finalize schematic, rerun simulation

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The tools

• IDM - preliminary design
• architecture, layout, schematic, sizing
• EASY5 - functional analysis
• performance
• CATIA - corporate CAD, PDM tool
• KIRTS - detailed design
• generative geometry
• SPARTS, ESDS, CPIMS, Enovia

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Filling the gaps
EASY5 - connectivity - flow direction -
parameters - analysis
IDM (PD) - connectivity - tube size, c-line -
flow reqds - flight condn
Schematic (KIRTS) - connectivity - logical
ports - EASY5 types - mapping to geom
KIRTS - geometry - assembly str
CATIA
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Build a proof of concept

• Automatic EASY5 model from KIRTS
• Input to KIRTS
• equipment geometry
• equip. names, types
• connectivity
• KIRTS generates tubes
• Output from KIRTS
• EASY5 XML of schematics
• Functional model in EASY5

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KIRTS Aircraft Systems Design

• In context design generation
• Rich design representations
• Find errors and inconsistencies
• Explore and evaluate design alternatives

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KIRTS approach

• Rich, integrated design representations
• Logical reasoning about design representations
• Design rules that operate on the design
  representations
• Grammars for generating languages of designs

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Integrating CAD and Function

• CAD Representation
• Solid Models
• Parts Assemblies
• Ports / Interfaces
• Part Classifications
• Schematics
• Connectivity
• System Hierarchy
• Simulation Models

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KIRTS context
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KIRTS Schematic

• Component names, types, ports
• Connectivity
• Currently specified in prolog
• connect_ schem(FilterU, 'Outlet', Line3U, '1')
• connect_schem(ReliefValveU, 'Inlet', Line3U, '2')

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Relate schematic to geometry

• Many-many mapping
• Need to maintain consistency
• Change propagation

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Implement connectivity

• Generate tubes automatically

• Map tubes to schematic

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Generate EASY5 XML

• Produced from schematic
• Geometric parameters obtained from KIRTS
• Other attributes also represented in KIRTS
• Integrated representation

XML file read into EASY5 produces.
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EASY5 Model
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A typical EASY5 component (Pipe)
INPUT
OUTPUT

• Quantity

Quantity
Port
Port
Description
Units
Description
Units
1 1 2 2 2
Mass inlet Temp Pressure O. Pres. Rate Temp Hy.
dia. Length Roughness Heat Coeff. Heat
Coeff. Flux Int. heat Therm. M.
Kg/m C bar bar/sec C cm cm cm W/m2/C W/m2/C W/cm2
W J/C
Q W TF P PD TR PF TW SQW SSS QF REY FRC ...
Mass inlet Temp Pressure O. Pres. Rate Temp Hy.
dia. Length Roughness Heat Coeff. Heat
Coeff. Flux Int. heat Therm. M.
Kg/m C bar bar/sec C cm cm cm W/m2/C W/m2/C W/cm2
W J/C
2 2 2 1 1 1
W TF P PD TR DH LEN RFC HI HO EFX QIN MTW ...
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Library data

• Need to develop interfaces to library data
• Company has a variety of standards libraries
• Need a single library standard
• Geometry, ports, analysis parameters,
  compatibility, preferred standards, inventory
• SPARTS, ISDS, PSDS, DMAPS, Enovia, ...

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Advantages

• Greatly simplifies generation of EASY5 model
• connectivity
• parameters
• Better control over scope of analysis
• specific geometric contexts
• specific spatial context
• specific system

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Lessons learned

• Schematic is unifying concept
• However granularity of schematic differs
• Initial challenges
• Management of ports---multiple semantics
• Schematic to geometry link
• Source of parameter values for analysis

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Need better integration

• Want ---
• Simulation based design
• Numerically optimize design parameters
• Integrate with PD
• Produce better design early in design
  process

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Conclusion

• Significant benefits from CAD integration
• simplifies generation of EASY5 model
• control scope of analysis
• more simulation during design
• But...we need better, integrated representations
• Towards simulation based optimal system design