analysis process in mobile crane development
TRANSCRIPT
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Analysis Process in Mobile Crane Development
Andreas Hofmann - November 2011
FAUN-HTC2011 1
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Overview
Circumstances
Analysis Process Before
Analysis Process Today
Preview
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Circumstances
Analysis Boundaries
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• Approx. 40 main boom telescoping states
• Approx. 20 possible configurations per state
• Over a turning range of 360°
• Additional boom extensions (~ 30-50 possible configurations)
• Different counterweights and outrigger bases
• And so on ….
More than 150.000 load cases to find a optimum that leads into a rated load value for the end customer
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Analysis Process
Before (Design Driven)
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Design
Draft
Design
Concept Design
Structure Analysis
Drawing In Out
• FEM Analysis only as a proof of design
• Early stage design failures come to light too late
• Structural needs were “less important”
• Where analysis results were needed, long waiting times occurred
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Analysis Process
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IGES Format Snapshot
(solid) Shell Model
Before (Design Driven)
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Analysis Process
Today (Crane Driven)
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Structure
Draft
Structure
Concept Structure
In Out Design
Draft
Design
Concept Design
Drawing
• Structure tells design how to look like in general, from the very beginning
• Designer and structural engineer understand each others needs much better
• Weight is most important structural design is important
• More but smaller analysis steps lead to faster results
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Analysis Process
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CATIA product opened inside HM
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Analysis Process
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Midsurfaces creation
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Analysis Process
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Stiching (semi-automatic)
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Analysis Process
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FE Model
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Analysis Process
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Designer modifies CAD models much faster than a structural engineer could modify FE models
Direct CAD model usage inside of HM speeds up calculation and ensures usage of the actual state of design
General finding
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Preview
What we have started …
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• Catia V5 integrated pre-analysis by the designer
• Structural optimization of existing machines (new motors & exhaust systems)
• Structural optimization during concept phase
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Thank you
ありがとうございます
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