parametric chassis design - fermilab · objective • design, model, and analyze a parametric...
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![Page 1: Parametric Chassis Design - Fermilab · Objective • Design, model, and analyze a parametric chassis based on sound engineering principles with the ability to: – Interface with](https://reader031.vdocuments.net/reader031/viewer/2022012923/5b36411b7f8b9aad388cd90a/html5/thumbnails/1.jpg)
Parametric Chassis DesignParametric Chassis Design
Nicole GiullianNicole GiullianMay 10, 2006May 10, 2006
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Outline• Objective• Concepts• Modeling• Analysis• Application
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Objective• Design, model, and analyze a parametric
chassis based on sound engineering principles with the ability to:– Interface with all other components– Adapt to fit all Industrial Design bodies
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Concepts• Solid/space frame
– Body mounted on later• Unibody
– Integrated body parts
• Challenges– Choosing design to fit
project scope and time frame
– Ensuring structural integrity– Aesthetic appeal
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Concepts• Tubular
– Simple tube design, similar to Solid frame
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Modeling• Various initial design
concepts
• Challenges:– Deciding upon both aesthetic
and sound engineering design– Defining parametrics robustly– Establishing naming
conventions– Waiting to build solid models
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Modeling• Various initial design
concepts• Chassis hard points
defined• Wireframe geometry
created
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Modeling• Various initial design
concepts• Chassis hard points
defined• Wireframe geometry
created• Suspension hard points
defined and linked• Guideline model
developed
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Modeling• Embedded spreadsheet
created
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Modeling• Embedded spreadsheet
created• Side lattice structure
and cross-bars approximated using Optistruct results
• Challenges– Properly defining static
loads– Interpreting results
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Modeling• Embedded spreadsheet
created• Side lattice structure
and cross-bars defined using Optistruct results
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Modeling• Embedded spreadsheet
created• Side lattice structure
and cross-bars defined using Optistruct results
• Mounting brackets for engine, suspension, transmission, bumper
• Roof pillars created
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Analysis• Model
approximation
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Analysis: HyperMesh• Primary mesher for
other analyses (collage this)
• Creates loads and boundary conditions
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3.730e+7 Pa
Hollow CylinderRadius 0.0300025 mThickness 0.005 mLength 0.45 mForce 1000 NMoment 450 Nmc 0.0300025 mr 0.0300025 mI 3.29466E-07 m^4J 6.58931E-07 m^4sigmax 4.10E+07 Patau 4.55E+06 Pa
taumax 2.10E+07 Pa
sigma1 4.15E+07 Pasigma2 0.00E+00 Pa
sigma3 -5.00E+05 Pa error = 10.07%
ArmLength (a) 0.1 mTorque (calculated) 100 Nm
likely due to mounting arm on top rather than in the center
JrFa
JTr
IcFl
IMc
xz
x
)(
)(
==
==
τ
σ
Analysis: NASTRAN• Stress analysis• Validation of results
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Analysis: NX FEA• Alternate method to
validate FEA results• Torsional analysis without
crossbars• Validating cross-bars and
floorpan
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Analysis: LS-DYNA• Crash analysis• Challenges
– Determining units– Defining material
properties– Analyzing more complex
geometry
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Analysis: LS-DYNA• Crash analysis• Challenges
– Determining units– Defining material
properties– Analyzing more complex
geometry– Defining circular crash
surfaces
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Analysis: LS-DYNA• Crash analysis• Challenges
– Determining units– Defining material properties– Analyzing more complex
geometry– Defining circular crash
surfaces– Establishing connectors
between parts
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Application
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Application
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Questions?