ansys 14 structural mechanics update
TRANSCRIPT
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2011 ANSYS, Inc. November 22, 2011
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Improving Your Structural Mechanics Simulations with Release 14.0
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2011 ANSYS, Inc. November 22, 2011
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Structural Mechanics Themes
MAPDL/WB Integration
Physics coupling
Rotating machines
Composites & Fracture Mechanics
Application Customization
Thin structures modeling
Contact analysis
Performance
Advanced Modeling
Geometry Handling
Listening to your needs, we have been able to identify a number of themes which form the basis of our roadmap and guide our developments
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2011 ANSYS, Inc. November 22, 2011
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What will Release 14.0 bring you?
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2011 ANSYS, Inc. November 22, 2011
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Lets now take a closer look at some topics
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2011 ANSYS, Inc. November 22, 2011
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MAPDL/WB Integration
Finite Element Information Access within ANSYS Mechanical
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ANSYS Workbench is originally a geometry based tool. Many users however also need to control and access the finite element information.
Motivation
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2011 ANSYS, Inc. November 22, 2011
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Spot Welds
Connections created internally at the solution level are available and can help understand the results
Reviewing Connections
Weak springs and MPC contacts as generated by the solver
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Nodes can be grouped into named selections based on selection logic, using locations or other characteristics or manual selections
Selections of Nodes
Box Selection Node Picking Lasso Selection
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2011 ANSYS, Inc. November 22, 2011
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Applying Loads and Orientations to Nodes
Nodal orientation allows users to orient nodes in an arbitrary coordinate system.
Direct FE loads and boundary conditions can be applied to selections of nodes.
Nodes are oriented in cylindrical system for loads and boundary condition definitions
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2011 ANSYS, Inc. November 22, 2011
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Results on Node Selections
Results are displayed on elements for which all nodes are selected.
Nodes named selections allow to scope on specific regions of the mesh or remove undesired areas.
Results with first layer of quads removed
Results on quads layers only
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2011 ANSYS, Inc. November 22, 2011
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Restart and Direct FE Loads
Nodal Forces and Pressures objects can be added to a restart analysis without causing the restart points to become invalid.
Other loads can now be modified without losing the restart points.
Analysis Settings tabular data: No restart point is lost
Added after initial solve
Second Load step modified for restart
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2011 ANSYS, Inc. November 22, 2011
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MAPDL/WB Integration
Linear Dynamics in ANSYS Mechanical
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2011 ANSYS, Inc. November 22, 2011
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Workbench and Mechanical enhancements
MSUP Transient Analysis supported
Joint feature can now be used in Harmonics, Random vibration analysis
Reaction Force & Moment results is now supported
Modal Superposition Transient
Joints in Harmonic Analyses
Reaction Forces in a Harmonic Analyses
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2011 ANSYS, Inc. November 22, 2011
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Physics Coupling
Data Mapping
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2011 ANSYS, Inc. November 22, 2011
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Motivation
Exchange files are frequently used to transfer quantities from one simulation to another. Efficient mapping of point cloud data is required to account for misalignment, non matching units or scaling issues.
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2011 ANSYS, Inc. November 22, 2011
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Supported Data Types
New at R14.0
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Increased Accuracy
The smoothness of the mapped data depends on the density of the point cloud.
Several weighting options are available to accommodate various data quality.
Triangulation versus Kriging
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2011 ANSYS, Inc. November 22, 2011
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Validating the Mapped Data
Visual tools have been implemented to control how well the data has been mapped onto the target structure
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2011 ANSYS, Inc. November 22, 2011
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Importing Multiple Files
Multiple files can be imported for transient analyses or to handle different data to be mapped on multiple bodies
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2011 ANSYS, Inc. November 22, 2011
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Rotating Machines
Studying Rotordynamics in ANSYS Mechanical
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2011 ANSYS, Inc. November 22, 2011
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Motivation
ANSYS Mechanical users need to be able to quickly create shaft geometries as well as analyze dynamic characteristics of rotating systems
Industrial fan (Venti Oelde)
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Geometry Creation
Geometries can be imported from a CAD system or imported from a simple text file definition as used in preliminary design
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2011 ANSYS, Inc. November 22, 2011
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Import/Export of Bearing Characteristics
ANSYS provides an interface that allows to import bearing characteristics from an external file
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Specific Solver Settings
Rotordynamics analyses require a number of advanced controls:
Damping
Solver choice
Coriolis effect
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Campbell Diagrams
Campbell diagrams are used to identify critical speeds of a rotating shaft for a given range of shaft velocities
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2011 ANSYS, Inc. November 22, 2011
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Composites
Enhanced Analysis Workflow and Advanced Failure Models for Composites
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Motivation
Efficient workflows and in-depth analysis tools are required to model and understand complex composites structures
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2011 ANSYS, Inc. November 22, 2011
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Defining Material Properties
Composites material require specific definitions including orthotropic properties, as well as some constants for failure criteria (Tsai-Wu, Puck, LaRc03/04, Hashin)
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Manually Defining Layers on Simple Geometries
Users can define simple layered sections for a shell body as well as define thicknesses and angles as parameters
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Defining Layers on Complex Geometries
For complex geometries, the ANSYS Composite PrepPost tool is used and layer definitions are imported in the assembly model in ANSYS Mechanical.
Courtesy of TU Chemnitz and GHOST Bikes GmbH
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Investigating Composites Results
ANSYS Mechanical supports layerwise display of results.
ANSYS Composite PrepPost offers comprehensive capabilities for global and plywise failure analysis.
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2011 ANSYS, Inc. November 22, 2011
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Advanced Failure Analysis
Crack growth simulation based on VCCT is available to simulate interfacial delamination.
Progressive damage is suitable for determining the ultimate strength of the composite (last-ply failure analysis)
2D laminar composite
Initial crack
Start of damage (layer 1)
Progressed damage (layer 1)
Progressed damage (layer 3)
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2011 ANSYS, Inc. November 22, 2011
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Customization
ANSYS Design Assessment
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Motivation
Many of you have expressed the need for: Computing and displaying specific results Be able to achieve more complex User defined results
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What is Design Assessment?
The Design Assessment system enables the selection and combination of upstream results and the ability to optionally further assess results with customizable scripts
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2011 ANSYS, Inc. November 22, 2011
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Expanded Result Access
Filtering of potentially invalid combinations can be suppressed to enable greater user control. This allows the user to access results not typically available in the base analysis.
Modal=No Beam Results
DA + Allow all Available Results allows beam results
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2011 ANSYS, Inc. November 22, 2011
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Design Assessment for Advanced User Defined Results
Design Assessment enable users to extend user defined results capabilities with:
Expressions using mathematical operators as supported by Python
Coordinate systems, Units Systems
Integration options
Nodal, Element-Nodal & Elemental result types
Import from external tables Script used to display scalar element data stored
in an external file
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2011 ANSYS, Inc. November 22, 2011
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Thin Structures
Mesh Connections
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Motivation
In order to connect meshes of different surface parts so as to merge nodes at intersections, users do not always want or cannot merge the topologies at the geometry level. Mesh based connections are required.
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Mesh Connections
Mesh connections work at part level:
As a post mesh operation
Base part mesh is stored to allow for quick changes in connections
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Modal Analyses Shows Proper Connections of the Various Bodies
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Further Meshing Enhancements
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Virtual Topologies Interactive Editing
Virtual topologies are handled more interactively through direct graphics interaction rather than tree objects.
User selects entities then applies VT operations
Direct access to operations from RMB menu
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2011 ANSYS, Inc. November 22, 2011
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VT Hard Vertex, Edge and Face Splits
Hard vertices can be added at any location on an edge or a face.
Hard vertices can then be used to create face splits from virtual edges.
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Virtual Topologies Applications
Get swept mesh on non-sweepable bodies
Improve shell mesh quality and orthogonality with VT combinations
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Contact Analysis
Rigid Body Dynamics
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Motivation
Many mechanisms and assemblies have components that operate through contact. In order to maintain the rapid turnaround for RBD simulations, there has been a subsequent focus on improving speed, accuracy and reliability of the contact capability.
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2011 ANSYS, Inc. November 22, 2011
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Performance Improvements
Valve: 158 sec elapsed time (2x speed up)
Piston: 9 sec elapsed time (7.5x speed up)
The applicability, robustness and efficiency of the contact has been improved for speed and accuracy expect a typical 2-5x speed-up
Transition and jump prediction have been greatly improved
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Contact Analysis
Flexible bodies
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Motivation
While already providing leading edge technology, ANSYS continues to enhance its ability to robustly and efficiently solve complex contact problems
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Projected Contact
Improved pressure results with surface projection
The Surface Projection Based Contact provides more accurate results (stresses, pressures, temperatures) and is now also available for bonded MPC contacts
Regular contact Projection based
Smoother temperature results on a multilayered structure
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2011 ANSYS, Inc. November 22, 2011
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Contact accuracy and robustness
Contact stabilization technique dampens relative motions between the contact and target surfaces for open contact
New contact stabilization prevents rigid motion
Adjust to touch causes rigid body motion and leaves a gap
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2011 ANSYS, Inc. November 22, 2011
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Performance
Further benefits from GPU boards
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2011 ANSYS, Inc. November 22, 2011
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Taking advantage of the latest hardware is mandatory to solve your large models.
A combination of relatively new technologies provides a breakthrough means to reduce the time to solution
Motivation
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2011 ANSYS, Inc. November 22, 2011
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Distributed ANSYS Supports GPUs
2.1 MDOF, Nonlinear Structural Analysis using the Distributed Sparse Solver
GPU Acceleration can now be used with Distributed ANSYS to combine the speed of GPU technology and the power of distributed ANSYS
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2011 ANSYS, Inc. November 22, 2011
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Speed-up from GPU technology
Solder Joint Benchmark - 4M DOF, Creep Strain Analysis
Results Courtesy of MicroConsult Engineering, GmbH
Linux cluster : Each node contains 12 Intel Xeon 5600-series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand
Mold
PCB
Solder balls
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2011 ANSYS, Inc. November 22, 2011
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Speed-up from multiple nodes with 1 GPU board per node
Mold
PCB
Solder balls
Results Courtesy of MicroConsult Engineering, GmbH
1 node @ 8 cores, 1 GPU
2 nodes @ 4 cores, 2 GPU
8 nodes@ 1 core, 8 GPU
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2011 ANSYS, Inc. November 22, 2011
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Advanced Modeling
Material Models
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Motivation
ANSYS provides a comprehensive library of advanced materials. Some users however need even more advanced models to include complex nonlinear phenomena in their simulations.
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Anisotropic Hyperelasticity plus Viscoelasticity for strain rate effects
Hyperelasticity coupled with Pore Pressure element
Shape Memory Alloy enhanced with superelasticity, Memory effect, New Yield Function, Differentiated Moduli (Austenite, Martensite)
Holzapfel Model - Capture the behavior of fiber-reinforced tissue
Advanced Materials for Biomechanical Applications
Hydrocephalus analysis Hyperelastic material with porous media
Stent modeling using shape memory alloys
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2011 ANSYS, Inc. November 22, 2011
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Nonlinear materials support for coupled field elements
Coupled field-elements for strongly coupled thermo-mechanical analysis now accounts for plasticity induced heat generation along with friction effects
Friction Stir Welding including heat generation due to friction and plastic deformation
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Advanced Modeling
Advanced Methods
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Motivation
The solver techniques available from our solutions allow to model complex phenomena. In some cases, better or different techniques are required to improve the accuracy or the convergence of the models.
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Advanced Nonlinear Methods
User can now perform: Buckling from a nonlinear prestressed state with dead loads (new subspace eigensolver)
3D rezoning for very large deformations for a wider range of materials and boundary conditions.
Hot-Rolling Structural Steel Analysis with 3-D Rezoning
Buckling of a pre-stressed stiffened container
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2011 ANSYS, Inc. November 22, 2011
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Analyzing Fasteners under Large Deformations
Bolt pretension does not include large rotation effects.
With release 14.0, you can now use Joint Loads: Lock joint at specific load step Apply Pre-Tension or Pre-Torque load use iterative PCG solver for faster runtime
Joint Element - Stress appears without significant bending
Pre-tension element - Significant bending stress with large rotation
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2011 ANSYS, Inc. November 22, 2011
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Coupled structures/acoustics simulations
Coupled problems are modeled more efficiently: Quadratic tetrahedral acoustics elements New acoustics sources Absorbing areas Enhanced PML formulation Near and far-field parameters
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2011 ANSYS, Inc. November 22, 2011
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Moisture Diffusion
Moisture induces hydroscopic stresses and alters thermal stresses.
Coupled-field elements allow to incorporate moisture effects in thermal, structural and coupled simulations.
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Advanced Modeling
Explicit Analysis
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Motivation
Explicit formulations extend the range of problems a structural engineer can solve. Providing handling capabilities similar to implicit solutions provides an easy transition from implicit to explicit.
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A Common User Interface
Implicit and explicit solutions share the same user interface for a shortened learning curve and allow straightforward data exchange between disciplines
Crimping
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2011 ANSYS, Inc. November 22, 2011
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New tetrahedral element
The new tetrahedral element helps quickly model complex geometries for low velocity applications such as drop tests for mobile phones or nuclear equipments Self Piercing Rivet
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Similarly to implicit analyses, 2D plain strain and axisymmetric formulations provide faster computation of explicit solutions
Fast Solutions Using 2-D Formulations
2D forming
Axisymmetric bullet model
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Geometry
Advances for Structural Engineers
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Motivation
With every release, ANSYS improves the quality of the geometry tools available in Workbench in order to increase the quality of the geometric data. Ease of use is also constantly improved to provide more efficient tools.
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2011 ANSYS, Inc. November 22, 2011
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Mid Surfacing Improvements
Selection tolerance is available to handle face pairs in case of imperfect offsets. Body thicknesses can be displayed on the model.
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Usability Enhancements
Toolbars can be customized for easy and direct access to preferred features and tools. Hot keys are also available for frequently used operations.
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2011 ANSYS, Inc. November 22, 2011
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SpaceClaim Direct Modeler
Preview sharing allow to control topology sharing before transferring the model into Workbench. Multi-face patch option increases the quality of repairs for missing faces.
Regular patch
Multi-face patch
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2011 ANSYS, Inc. November 22, 2011
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Physics Coupling
System Optimization with Rigid Body Dynamics and Simplorer co-simulation
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Motivation
Most mechanisms and assemblies are managed via control systems.
System simulation, including the details of the mechanism or assembly, are needed in order to improve modeling accuracy, fidelity and ultimately system optimization.
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Linking Mechanical and Simplorer
Inputs and outputs are defined as pins in the Mechanical model and connected to the schematics of Simplorer
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Simulation Results
Force Applied on Pistons Rotational Displacement
Rotational Velocity
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Some Examples
Aircraft Landing Gear
Simplorer schematic of hydraulic circuit and control
RBD model
Robotic Arm Control
Trace of arm trajectory
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And there is much more
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check the Release Notes!
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Think also of the Technology Demonstration Guide
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Questions?
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Appendix
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Customization
Application Customization Toolkit
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Motivation
As a Mechanical User, you may want to: Customize menus Create new loads and boundary conditions Create new types of plots Reuse APDL scripts without command snippets
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What is the Application Customization Toolkit?
The Application CustomizationToolkit is a tool that facilitates customization of ANSYS Mechanical. It provides a way to extend the features offered by ANSYS products.
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Toolbar Customization through XML Files
1 Convection_Blade_Computation
XML definition:
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Python Driven Loads and Boundary Conditions
Python script:
# Get the scoped geometry: propGeo = result.GetDPropertyFromName("Geometry") refIds = propGeo.Value
# Get the related mesh and create the component: for refId in refIds: meshRegion = mesh.MeshRegion(refId) elementIds = meshRegion.Elements eid = aap.mesh.element[elementIds[0]].Id f.write("*get,ntyp,ELEM,"+eid.ToString()+",ATTR,TYPE\n") f.write("esel,s,type,,ntyp \n cm,component,ELEM")
# Get properties from the details view: propThick = load.GetDPropertyFromName("Thickness") thickness = propThick.Value propCoef = load.GetDPropertyFromName("Film Coefficient") film_coefficient = propCoef.Value propTemp = load.GetDPropertyFromName("Ambient Temperature") temperature = propTemp.Value # Insert the parameters for the APDL commands: f.write("thickness="+thickness.ToString()+"\n") f.write("film_coefficient="+film_coefficient.ToString()+"\n") f.write("temperature="+temperature.ToString()+"\n")
# Reuse the legacy APDL macros: f.write("/input,APDL_script_for_convection.inp\n")
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Writing APDL Commands From the New Definition
! APDL_script_for_convection.inp ! Input parameters: esel,s,type,,10 cm,component,ELEM thickness = 1.1 film_coefficient = 120. temperature = 22. ! Treatment: /prep7 et,100,152 keyop,100,8,2. et,1001,131 keyo,1001,3,2 sectype,1001,shell secdata,thickness,10 secoff,mid cmsel,s,component emodif,all,type,1001 emodif,all,secnum,1001 type,100 esurf fini alls /solu esel,s,type,,100 nsle sf,all,conv,film_coefficient,temperature alls
APDL
WB Mechanical
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An Example: ACT driven Submodeling
Users simply select the coarse models results file, all APDL commands are automatically created no more need for command blocks!
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Advanced Modeling
Offshore Structures
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Over the period of the design of an offshore structure from Concept through FEED and Detailed Structural and Equipment Design there are needs for many different analyses related to global structural design and integrity and detailed component level analysis. To ensure delivery timeliness, and reliability where costs of failure are so high, there is considerable value in compatibility between the respective tools. This is delivered by the ongoing integration of ANSYS AQWA in Workbench and delivery of enhanced capabilities in Mechanical/MAPDL for offshore structures analysis.
Importantly, ANSYS Structural Mechanics products now deliver the ability to conduct both global and detailed analysis of offshore structures subjected to various wave and environmental loadings.
Global Offshore Structures
Local joint flexibility analysis
Global hydrodynamics and structural analyses
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Hydrodynamic Time Response system enhancements include Fenders (similar to contact)
Allows connections between 2 structures or between a structure and a fixed point
Articulations (similar to joints)
Further AQWA Integration in Workbench for Multi-Body Wave Hydrodynamics
Offloading arm represented with series of typical articulations
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Enhanced Environmental Conditions and Cable Behavior in AQWA
Introduction of multi-directional wave spectra allows more realistic modelling of real wave conditions, and is important for the accurate simulation of moored vessels and offshore platforms
Almost any combination of wave spectra to be modelled in the solver modules LIBRIUM, DRIFT and the Hydrodynamic Time Response system in Workbench
To meet API standard (RP2SK), non-linear axial stiffness can be used to define a mooring line
Gaussian formulated wave spectrum now available in the core solver and the Hydrodynamic Time Response system
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Diffracted wave loading Provides simplified pressure loading from
Hydrodynamics Diffraction systems (AQWA) onto MAPDL system
Harmonic Wave Loading Regular wave loading now available for harmonic
response analyses
ANSYS FATJACK (for beam joint fatigue of framed structures) automatically reads the RST file data for harmonic load cases
ANSYS BEAMCHECK (for member checks on framed structures) and ANSYS FATJACK now delivered with Mechanical installation
See Design Assessment for further information
Extended Wave Loading in Mechanical and links to Regulatory Code Checks
Vessel Loading Transfer from AQWA to Mechanical Courtesy of Vuyk Engineering Rotterdam
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Aeroelastic coupling (for wind turbine support structures)
Sequential Allowing structural (ANSYS) and aeroelastic (3rd
party) analyses to be run independently
Just use a provided MAPDL macro to write out input data for the aeroelastic analysis
Fully coupled Co-simulation of structural and aeroelastic tools
Custom build of MAPDL required, with a macro to manage the data availability from and to MAPDL
Coupling Mechanical with 3rd Party Aeroelastic Tools for Offshore Wind Turbine Modeling
Images Courtesy of REpower Systems AG
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Advanced Modeling
Brake Squeal
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Motivation
Brake Squeal is a consistent customer complaints and is associated with high warranty costs.
ANSYS provides the best solution for such analyses, including complex Eigen-Methods to predict onset of squeal, new state-of-the-art linear methods and parametric studies.
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Complex Eigen solve Animate: Complex Mode Shape Contact Status at Pads
ANSYS Solution for Brake Squeal
CAD Mesh &
Connection Setup & solver
Post Processing
Bi-Directional CAD Connectivity
Automated Contact Detection
Provides for sliding contact with friction No match mesh needed Supports higher order elements Automated Meshing
Flexibility to use Linear & Non-linear solver capabilities
Root locus plots Correlation of modes List Strain energy per component per mode
Friction sensitivity study
Physical prototyping time consuming and expensive
Provide more analysis early in the design cycle
Parametric Study by changing friction coefficient
Run set of DOEs
Reuse symmetric modes and just run un-symmetric part
Significant time reduction
Can Include Squeal and Contact damping - Sliding velocity
dependent Friction