Realistic Simulation of a Flexible Mechanism using ANSYS Solutions
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Realistic Simulation of a Flexible Mechanism using ANSYS Solutions
Page 1 ... Explicit. ANSYS/AUTODYN. ANSYS/Multiphysics. Meshing. ICEM CFD
... 12. 14. 16. 18. 20. • Rotation of tires and contact with payment ignored.
Realistic Simulation of a Flexible Mechanism using ANSYS Solutions Achuth Rao, Ph.D. Product Line Manager Product Management Group ANSYS Inc.
Solution Brands and Products Structural
ANSYS/Mechanical
Fluids
CFX/FLUENT
Explicit
ANSYS/AUTODYN
ANSYS/Multiphysics Electromagnetics
ANSYS/EMAG
Meshing
ICEM CFD
Optimization
ANSYS/DesignXplorer
Geometry 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.)
Workflow: 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
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 Representation
=
Geometry representation
FE Mesh Representation
• Connectors and contact behavior defined on geometry • Equivalent FE representation though mass and connectors
Nonlinear Contact Modeling with Friction
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 Damping K = 10000 lb/in C = 5 lbf-sec/in
Landing Gear without Rotation and Contact • Rotation of tires and contact with payment ignored • Tire model approximated with a spring‐damper system 250000
200000
150000
100000
50000
0 0
2
4
6
8
10
12
14
Reaction vs Strut Stroke
16
18
20
Landing 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 250000 200000 150000 100000 50000 0 0
5
10
15
Reaction vs Strut Stroke
20
Dynamic Drop Test Analysis
Reaction vs Strut Stroke
FMBD Solution Strategies & Benefits Traditional Techniques
MESH
PRE
FEA
CB
FE Based Approach
MESH PRE
FEA
MBD
POST
Savings
POST
CB = Craig Bamptom Technique
• FE based FMBD offers time savings in total solution time as compared to traditional approaches • Made possible by an integrated solution environment combined with improvements in solver technology and high performance computing
Workflow: 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
Static 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 connections
Connections and Contact Definition
Meshing and Pre‐processing
Mesh Metrics
Static Analysis: Dynamic Braking & Turning
Turning Loads Displacement Results
Equivalent Stress Results
Parameter 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 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 Parameters
Post‐processing through design iterations
Reduced stresses levels Equivalent Stress
Displacement Results
Equivalent Stress Results
Topological Optimization
Upper and Lower Torsion Links
Minimization of Structural Compliance
ANSYS System Simulation Capabilities • ANSYS Workbench provides an integrated solution environment for CAD geometry, meshing, CFD, implicit/explicit structural dynamics Landing Gear Acoustics Simulation and optimization using FLUENT • 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 …
