Developing Custom Modeling Tools at GM with embedded Validation

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Developing Custom Modeling Tools at GM with
embedded Validation
James A. Bullard General Motors
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ABSTRACT

• Automotive Design and Engineering at GM are
  constantly looking for technology to automate
  processes. This search for automation
  technology provides many unique requirements that
  drive the development of custom CAD Modeling
  tools. To make sure that the return on the
  investment is achieved GM is embedding validation
  tools to assure quality of Math as well as
  quality of process execution. This paper will
  describe projects that have developed custom
  Modeling Templates with Validation agents built
  in. These validation agents will not only
  validate quality of the math but also the overall
  process execution or usage of the templates.

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General Motors Validation Facts
Check-Mate as globally agreed upon CAD validation
tool Successfully implemented Check-Mate at all
Engineering Centers Globally Enforced 53
Check-Mate Checkers as part of GM workflow
Check-Mate used as CAD Data Assessment Tool More
than 200,000 NX parts assessed weekly using
check-mate batch mode Significant improvement in
Math data quality
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Purpose

• Overview of GM Development Project in 2008 of
  Math Data Quality Validation in Product Templates
• Articulate the importance of Math Data Quality
  and particularly as it applies to Re-use geometry
  tools as Corporate Assets
• Describe a Validation framework for Templates
  that incorporates Requirements Driven Design
  Validation (RDDV) embedded in Product Templates
• Highlight Challenges to further develop this
  strategy and direction

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Embedded Validation Tool for Global Template
Based Component Project

• Objectives
• Assess completed templates
• Develop Bill of Requirements/Validation rule set
• Define framework/architecture for template
  validation and enforcement strategy (must be
  flexible in order to comprehend future
  requirements)
• Develop 1 Profile and 10 Requirements Driven
  Design Validation (RDDV) checks for each template
• Develop requirements list for embedded RDDV
  checkers for new templates

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Math Data Cycle

• CheckMate Profiles and Checks need to address all
  areas of the cycle
• Math Data Producers
• Math Data Consumers
• Re-Use of Math Data
• CheckMate Profiles and Checks need to be aligned
  with the requirements of these areas
• CheckMate Profiles and Checks also used to
  improve Math Capability (CAD Methods)

Templates turn Data Producers into Data Consumers
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Hierarchy of Math Quality
Check-Mate Capability
Design Function Checks
Fabrication Process Checks
Modeling Best Practice Checks
Geometry Integrity Checks
File Organization Checks
Scope
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Validated and Managed Templated Math Data is an
Investment

• Re-use is a high priority in any corporate
  strategy
• Validated Templates come with pre-loaded Data
  Consumer value
• CAE data material properties, mid-surface
  features, etc
• CAM data holes, drills, etc
• PMI embedded tolerances, VSA modeling data,
  etc
• Templates are investments that can pay dividends
  when validated and managed

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Validation Framework Project Prototype Targeted
Template Part
Exhaust Manifold GM Powertrain
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Validation Framework - Dimensions of Validation

• Validation Of Templates
• Math Data Quality (MDQ)
• Component Engineering Requirements
• Fabrication Requirements
• Systems Of Templates
• Managed Interfaces
• System Level Geometry Requirements

Dimensions of Validation Siemens Toolset Siemens Toolset Siemens Toolset
CheckMate RDDV Core NX
Math Quality p
Engineering Requirements p p p
Fabrication Requirements p p p
System Requirements p p p
Toolsets need to work together and know about
each other They should be able to communicate to
each other
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Validation Framework Prototype Validation
Requirements

• Dimensions of Validation for Prototype
• Math Data Quality
• File Organization GQS Profile (CM)
• Vehicle Partition code (VPPS)
• Examine Geometry
• Component Engineering Requirements
• Sketch Dimensions Port Opening (RDDV)
• Minimum Wall Thickness (RDDV)
• Minimum Blend Radii (RDDV)
• Fabrication Requirements
• Embedded tolerances
• System Requirements
• Managed interfaces
• Port Surface Datum Planes (CM)
• Port Datum Axis (CM)

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Template Validation Framework

• The Framework should allow for dynamic/flexible
  profile configuration to support multiple
  validation profiles or levels based on template
  purpose discipline (ie., single component vs.
  sub assembly, BIW vs. PT)

Release Part Rqmts
Engineering Rqmts
Template Validation Profile
Test Rqmts
Mfg Process Rqmts
System Rqmts
Org Rqmts
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Validation Framework Prototype Requirements
Document

• Requirements Validation
• Future direction to link to Teamcenter System
  Engineering (TcSE)
• Prototype using Excel Spreadsheet

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Future Challenges as Strategy Evolves

• Template Structures
• Many ways to organize template structure which
  drive too much variability into structure and
  thus harder to devise a validation strategy
• Management of Templates and Requirements Document
• RDDV needs enhancements
• Recognize entities and features
• RDDV checks can invoke CheckMate Checkers
• Enforcement of RDDV checks
• CheckMate needs more sophisticated profile
  capabilities
• Profiles execute different based on decisions and
  rules
• Profiles and checkers know about RDDV checks

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Thank You!
Questions?