Sponsors CAPTURING AND CREATING ENGINEERING CONTEXT IN MECHANICAL
- Slides: 25
Sponsors: CAPTURING AND CREATING ENGINEERING CONTEXT IN MECHANICAL DESIGN SCENARIOS Victor H. Mucino, Samrat Sarovar, Aaron F. Montejo Mechanical and Aerospace Engineering West Virginia University For Long-Term Retention, Retrieval and Use of Complex Engineering Information
Need for Long-term Information Retention New CAD, CAE, CAM technology Lack of a standard language Loss of context in a design Engineering communication problems
Problem Statement Lack of ability to capture most of the data created No record of the sequence of these data is created Human Factors Lost of design context
Greenbank WV, 1988 Nov 15, 1998 Nov 16, 1998
RCB Telescope 140’ Telescope
Context Non-technical information regarding the design WHY, WHO, WHAT, WHEN of the design Lack of context is lack of knowledge Important details required to reuse or reconstruct the design Gives an inside into the designer’s resources and the thought process Bridge between rationale and product
Solution Statement STEP IDEF 0 • Express language • Application Protocols • Federal Standard • Creation of engineering activities • Correlation between activities • Integration of the entire system
STEP Application Protocols • Applicability • Reliability • Availability
IDEF 0 Standard Each activity contains information All activities are related to each other Easy to describe design context
Fundamental tasks of the design process Geometric characterization Material properties Operating loads and boundary conditions Failure criteria
Engineering Design Scenarios
Engineering Design Scenarios GEOMETRIC CONFIGURATION LOADS AND BOUNDARY CONDITIONS MECHANISTIC MODEL MATERIAL PROPERTIES THE FAILURE ASSESSMENT PROBLEM FAILURE ASSESSMENT
Engineering Scenarios Design methods
Generic Engineering Scenario for a Design-Analysis Manufacturing of a Mechanical System
Engineering Scenarios and Various Beginnings Technology development (Pressure vessel) Design evolution Troubleshooting (Leaking transmission) Design/Subsystem replacement scenario (Rudder)
The Case of a Leaky Transmission
Troubleshooting Engineering Scenario 1. Analysis of field reports, general review 2. Inspection of failed transmissions, check for leak signs 3. Review design specifications 4. Tests bolt tension relaxation 5. Measurement of flange surface flatness 6. Tests of flange contact pressure 10. Geometry: Flange geometries extracted from original design 11 Material: Properties from design specs 7. Finite Element Model: Contact pressure analysis of bolted flanges 12. Loads & BC: Bolt tightening specs from design 13. Failure Criteria: Bolt tension, Contact pressure 15. Results: Postprocessing 8. Prediction of leak Rates for current design yes 16. Success ? no 14. Use M & Y values from ASME Code for contact pressure Frames in green designate functions supported by STEP APs. Frames in blue designate functions that can be supported but not widely available Frames in red designate functions that are not currently supported by STEP 17. Redesign Iteration: Bolt tension, flange dimensions 9. Redesign recommendations
Technology Development Scenario
Technology Development Scenario
Technology Development Scenario Boxes: Activities (Tasks) Arrows: Concepts (Information) Arrows on top boxes: controlling factors Arrows at bottom of boxes: mechanisms and resources Arrows on the left of boxes: inputs Arrows that exit box: outputs. GREEN – STEP AP being used. BLUE - STEP AP available but not being used. RED - STEP does not provide support.
Technology Development Scenario AP 209 AP 203 e 2 AP 214 AP? ? ?
Design/Subsystem replacement Scenario
Design/Subsystem replacement Scenario AP 203 e 2 AP 214 AP 218 AP 209 AP? ? ?
Summary Importance of engineering context for long term preservation Use of a design taxonomy for more discipline in documentation IDEF 0 (relationship between engineering activities) AP STEP (implementation, wider coverage)
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