Combining ProENGINEER, ProMECHANICA, and Mathcad to Solve Real World Problems

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Combining Pro/ENGINEER, Pro/MECHANICA, and
Mathcad to Solve Real World Problems

• Stephen Seymour, P.E.Seymour Engineering
  Consulting Group, LLC
• www.seymourecg.com

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Presentation Outline

• Introduction
• Problem description
• Analysis methodology
• Pro/Engineer, Pro/Mechanica, and MathCAD
  integration
• Results
• Design optimization
• Conclusions

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Introduction

• Modern engineering and design problems require a
  comprehensive approach in order to effectively
  and efficiently achieve a solution
• Many design/engineering tasks are
  compartmentalized
• Pro/Engineer CAD tool for model development
• Pro/Mechanica Integrated FEA
• MathCAD Engineering and scientific calculation
• All three software solutions can be combined
  within the Pro/Engineer modeling environment

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Example Problem

• Goal Determine the maximum stresses and
  displacements of the door/hinge assembly
• Door is nylon, hinges are 6061 aluminum
• Initial angular velocity of door is known
• Forces due to impact are not known

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Analysis Methodology
Knowns/Unknowns

• A force or acceleration is required for a
  Pro/Mechanica static structural analysis
• Angular velocity is a load type and it is known,
  but will only simulate centrifugal loading. Will
  not simulate impact.
• Angular acceleration is a load type, but the
  value is unknown and is dependent on the
  structural response of the system
• How can the angular acceleration load be
  determined?

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Analysis Methodology
Conceptual Solution

• One possible approach Energy Methods
• Let kinetic energy (KE) strain energy (SE)
• KE can be obtained from Pro/Engineer and MathCAD
• SE can be obtained from Pro/Mechanica
• We must determine the required load so that KE
  SE

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Analysis Methodology
Procedure

• Use Pro/Engineer to determine inertia
• Apply arbitrary acceleration load to determine
  the initial SE response
• Transfer inertia results and preliminary
  Mechanica results to MathCAD to determine KE and
  the multiplication factor
• Transfer multiplication factor from MathCAD to
  Pro/Mechanica
• Run analysis where KE will equal SE

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Analysis Methodology
Flow Chart
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Geometry

• Set material properties within Pro/Engineer
• Door to be nylon
• Hinges to be 6061 aluminum
• Set units

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Pro/Engineer MathCAD Integration
Inertia Properties

• Create model analysis feature to get inertia
  properties
• Select coordinate system where y axis passes
  through hinge axis

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Pro/Engineer Pro/Mechanica Integration
Define 1st Mechanica Analysis

• Apply constraints
• Apply arbitrary angular acceleration in LoadSet1
• Define analysis

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Pro/Engineer Pro/Mechanica Integration
Mechanica Results to Pro/Engineer

• Create Mechanica Analysis feature in Pro/Engineer
• Select the newly created analysis
• Pro/Engineer will automatically import result
  parameters

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MathCAD Worksheet

• Create worksheet defining KE equation
• Create input variables for Iyy and SE from 1st
  Mechanica analysis
• Create output variables for multiplication
  factor, KE, and SE
• Tag input variables with proe2mc and output
  variables with mc2proe

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Pro/Engineer MathCAD Integration
Pass Variables to MathCAD

• Create MathCAD analysis feature
• Map the inertial parameter from ProE to
  Iyy in MathCAD
• Map the SE from Mechanica analysis feature to the
  MathCAD SE variable

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MathCAD Pro/Mechanica Integration

• Create second analysis in Mechanica with angular
  acceleration load in LoadSet2
• Create relations feature for Load2 value
• Create 2nd Mechanica Analysis feature

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Results

• Stress and displacement results based on peak
  deceleration load
• Add annotation feature to present and double
  check results

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Parametric Analysis

• Subsequent design changes will automatically be
  reanalyzed

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Design Optimization

• Due to parametric relationship between the FEA
  analysis and model, design optimization and
  sensitivity studies can be performed.

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Conclusion

• Pro/Engineer, Pro/Mechanica, and MathCAD can all
  be linked via the feature tree
• Parametric associatively allows for automatic
  updating
• Subsequent behavioral modeler optimization
  features can be added to further automate the
  design process

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