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Ansys
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Realistic Simulation of a Flexible Realistic Simulation of a Flexible Mechanism using ANSYS SolutionsMechanism using ANSYS Solutions
Achuth Rao, Ph.D.Product Line Manager
Product Management GroupANSYS Inc.
Solution Brands and ProductsSolution Brands and ProductsStructural
ANSYS/Mechanical
Electromagnetics
ANSYS/EMAG
Fluids
CFX/FLUENT
Explicit
ANSYS/AUTODYN
ANSYS/Multiphysics
Meshing
ICEM CFD
Optimization
ANSYS/ANSYS/DesignXplorerDesignXplorer
Geometry and CAD integrationGeometry and CAD integration
Benefits• Support for all major CAD
systems and file formats
• Bi‐Directional Associativity
• Parameter data types supported:– Geometry
– CAD Parameters
– Material Properties
– Attributes (Loads; Constraints etc.)
ANSYS WorkbenchANSYS Workbench
Workflow: Dynamic Drop Test AnalysisWorkflow: Dynamic Drop Test Analysis
Benefits• Integrated dynamics solver capability• Reduces total solution time through
meshing; pre‐processing; solution and post‐processing
• Accurate physical representation as compared to rigid multi‐body solvers
• Flexibility can be introduced when needed either based on component mode synthesis or full nonlinear analysis
• CAD associativity allows for easy parametric updated to design
CAD: CATIA R17CAD: CATIA R17
ANSYS ANSYS DesignModelerDesignModeler
ANSYS SimulationANSYS Simulation
ANSYS Flexible MultiANSYS Flexible Multi‐‐body Dynamicsbody Dynamics
Benefits• Automatic connections setup• Implicit structural solution• Multi‐step transient analysis• FE based rigid body analysis• Nonlinear contact with friction• Geometry based loading and
processing of dynamics data• Rigid to flexible part conversion• Component Mode Synthesis (CMS)
techniques for model reduction and flexibility
Connectors and FE RepresentationConnectors and FE Representation
• Connectors and contact behavior defined on geometry
• Equivalent FE representation though mass and connectors
FE Mesh RepresentationFE Mesh RepresentationGeometry representation Geometry representation
==
Nonlinear Contact Modeling with FrictionNonlinear Contact Modeling with Friction
Contact Mesh Contact Mesh
• Rigid‐rigid contact model between tire and runway
• Nonlinear frictional contact with between tires and runway
• Tire Representation:– Tire stiffness and damping modeling
using springs and dampers below runway
Tire Stiffness and DampingTire Stiffness and DampingK = 10000 lb/inK = 10000 lb/inC = 5 C = 5 lbflbf--sec/insec/in
Stiffness and Damping Characteristics Stiffness and Damping Characteristics
Nonlinear Stiffness CurveNonlinear Stiffness Curve
Nonlinear Damping CurveNonlinear Damping Curve0
100000
200000
300000
400000
500000
600000
700000
0 2 4 6 8 10 12 14 16 18 20 22
0
200
400
600
800
1000
1200
1400
1600
1800
0 2 4 6 8 10 12 14 16 18 20
Landing Gear without Rotation and ContactLanding Gear without Rotation and Contact
0
50000
100000
150000
200000
250000
0 2 4 6 8 10 12 14 16 18 20
• Rotation of tires and contact with payment ignored• Tire model approximated with a spring‐damper system
Reaction Reaction vsvs Strut StrokeStrut Stroke
Landing Gear with Rotation and FrictionLanding Gear with Rotation and Friction
• Rotation of wheel at approach speed of 150 mph• Friction behavior with contact• Tire model approximated with a spring‐damper system
Reaction Reaction vsvs Strut StrokeStrut Stroke
0
50000
100000
150000
200000
250000
0 5 10 15 20
Dynamic Drop Test AnalysisDynamic Drop Test Analysis
Reaction Reaction vsvs Strut StrokeStrut Stroke
FMBD Solution Strategies & BenefitsFMBD Solution Strategies & Benefits
• FE based FMBD offers time savings in total solution time as compared to traditional approaches
• Made possible by an integrated solution environmentcombined with improvements in solver technology and high performance computing
Traditional TechniquesTraditional Techniques
MBDMBDFEAFEA CBCB POSTPOSTMESHMESH PREPRE
FEAFEA POSTPOSTMESHMESH PREPRE
FE Based ApproachFE Based Approach SavingsSavings
CB = Craig CB = Craig BamptomBamptom TechniqueTechnique
ANSYS WorkbenchANSYS Workbench
Workflow: Static AnalysisWorkflow: Static Analysis
Benefits• Easy model reduction and simplification for static analysis
• CAD associativity allows for easy parametric updated to design
• Advanced unified meshing tools from ANSYS, ICEM CFD, CFX and FLUENT
• Integrated design optimization & topological optimization solutions
CAD: CATIA R17CAD: CATIA R17
ANSYS ANSYS DesignModelerDesignModeler
ANSYS SimulationANSYS Simulation
ANSYS ANSYS DesignXplorerDesignXplorer
Static Analysis: Cylinder & Lug DesignStatic Analysis: Cylinder & Lug Design
• Automatic connections and contact definition
• Geometry and FE based pre‐processing and post‐processing
• Nonlinear geometry and contact capability
• Ability to run design changes through parametric model updates
Automatic contact and connectionsAutomatic contact and connections
Connections Connections and Contact and Contact DefinitionDefinition
Meshing and PreMeshing and Pre‐‐processing processing
Mesh MetricsMesh Metrics
Static Analysis: Dynamic Braking & TurningStatic Analysis: Dynamic Braking & Turning
Displacement ResultsDisplacement Results
Turning LoadsTurning Loads
Equivalent Stress ResultsEquivalent Stress Results
Parameter Manager & Design OptimizationParameter Manager & Design Optimization
• Parameter Manager across all applications:– Design of experiments
– Design for six sigma and robust design
• Input and output parameters from CAD; material properties; boundary conditions and results and derived results variables
Geometry Updates and Design ParametersGeometry Updates and Design Parameters
• CATIA model update within ANSYS DesignModeler through parametric design
• Model updates can be transferred back to CAD system through bidirectional associativity
Automatic Mesh Updates with Design ParametersAutomatic Mesh Updates with Design Parameters
PostPost‐‐processing through design iterationsprocessing through design iterations
Displacement ResultsDisplacement Results
Equivalent StressEquivalent Stress
Equivalent Stress ResultsEquivalent Stress Results
Reduced stresses levelsReduced stresses levels
Topological OptimizationTopological OptimizationUpper and Lower Torsion LinksUpper and Lower Torsion Links
Minimization of Structural ComplianceMinimization of Structural Compliance
ANSYS System Simulation CapabilitiesANSYS System Simulation Capabilities
• Capabilities for system simulation of aircraft landing gear
– Structural dynamics simulation of landing gear
– Thermal analysis of landing gear brake assembly
– Brake squeal analysis of landing gear brake dynamics
– CFD analysis for landing gear noise simulation …
• ANSYS Workbench provides an integrated solution environment for CAD geometry, meshing, CFD, implicit/explicit structural dynamics and optimization
Landing Gear Acoustics Simulation Landing Gear Acoustics Simulation using FLUENTusing FLUENT