Ansys Mech Technology v11

© 2007 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

ANSYS Mechanical Technology

New Feature Update Version 11…


Mechanical Technology Status

• Release v11– State-of-the-art ANSYS technologies

• Released in Feb of 2007

– Major analysis initiatives• Simulation analysis type organization• Flexible and rigid multi body dynamics• Advances in materials, nonlinear solution mechanics, and

multiphysics• Explicit dynamics

– New edition now available (Sept 2007)• Network installation• Windows Vista• Performance improvements


Mechanical Technology Status

• Future releases– Advancing CAE integration

• Ease-of-use• Multiphysics analyses• Geometry integration• Mesh generation breadth and robustness

– Mission• Intuitive and comprehensive• Engineering Simulation


Presentation Boundaries

• ANSYS Workbench– CAE Platform for all ANSYS technologies looking forward

• Technologies covered in this presentation– Mechanical– Multiphysics– Explicit dynamics– High performance computing– Parametric analysis

• Technologies covered in other presentations– CAD connectivity– Geometry modeling– Mesh generation– Fluid dynamics


Agenda

• Multiphysics Solutions– Coupled Physics– EMAG

• Explicit Solutions– AUTODYN in Workbench

• Offshore Solutions– ASAS, AQWA, ANSYS

• High Performance Computing– Solver Speed-up

• Workbench/Simulation– Simulation– Parameter Manager– DesignXplorer– FE Modeler

• Mechanical Solutions– Multi Body Dynamics*– Elements– Contact– Materials– Dynamics– Thermal

* Major initiative across the technology


Workbench/Simulation

Back to Agenda


Workbench/Simulation New Analysis Typing

Analysis types and linking


Workbench Symmetry• Automated symmetry condition

from DM to Simulation– Symmetry– Anti-symmetry


Workbench/Simulation New Part Stiffness

Rigid and flexible parts


Workbench/Simulation New Connections

Springs and joints


Workbench/Simulation New Model Configuration Setting

Joints used to position geometry before analysis

Applicable to all analysis types (i.e. joint can be deleted)


Workbench/Simulation Joint DOF Checker• Estimates free degrees of freedom of the model,

potentially predicting over constraint• Displayed in worksheet of Connections


Workbench/Simulation Initial Contact Information

Initial contact result contours are also available


Workbench/Simulation New PSD Analysis

PSD analysis in Simulation

PSD load specification inEngineering Data

G Acceleration vs. Freq


Workbench/Simulation New Forms for Loads

Constant, tabular, function loads over load steps and time

RMB to activate or deactivate


Workbench/Simulation New Forms for Loads

• Loads as a function of time/step– Tables

• Entries typed in• Entries copy and paste to and from Excel

– Functions ( example: “100*sin(5*time)” )• Standard math operators +,-,/,*,^• Trigonometric functions “sin”, “cos”, “asin”, …• Name “time” is a reserved to represent time in functions


Workbench/Simulation New Types of Loads

• Joint condition– Displacement– Rotation– Velocity– Acceleration– Force– Moment

• Line pressure• Hydrostatic pressure• Elastic support


Workbench/Simulation New Forms of Results

Time history/steps post-processing


Workbench/Simulation New Report Generator

• “Scrapes” Workbench GUI to generate report

• Reflect exactly all analysis definitions

• Primarily tables and figures– Less text than

before


Workbench/Simulation Probes, Charts, Tables


Workbench File Management

Simulation post processing depends on ANSYS results file


Workbench/Simulation Legend

• Context menus• Named Legends

– Reuse• In-place editing• Display options• Positioning


Workbench/Simulation Legend

Movable, sizable, color changeable


Global Parameter Manager

Back to Agenda


Parameter Manager General Information

• Displays all parameters from Workbench modules

• View input and output parameters, change input parameter values and rerun the complete analysis to generate new output parameter values

Presenter

Presentation Notes

Displays all parameters within Workbench modules Except DesignModeler, which is treated like any other CAD system, such that parameters will not be available until the geometry has been attached When items are promoted to the parameter manager, the value within the application becomes read only! View input and output parameters, change input parameter values and re-run the complete analysis to generate new output parameter values Parameter Manager window is a non-docked floating window, which remains in place when switching between applications that support parameters


Parameter Manager Expressions

• Expressions – Create constant values (e.g. Pi, e)– Combine input parameters and/or constant

values


DesignXplorer

Back to Agenda


DesignXplorer

• Sampling Methods (Extend DOE)– Optimal Space Filling Design (new at v11)– Central Composite Design

• Meta Models (Improved Fittings)– Kriging (new at v11)– Non Parametric Regression (new at v11)– Neural Network (new at v11, beta)– 2nd Order Polynomial

• Ability to refit data• Ability to add additional data points• Weighted Latin Hypercube

• Works with CFX

Presenter

Presentation Notes

Additional sampling methods allows us to provide better fits with the least amount of FEA analyzes. Additional sampling methods gives us much more freedom to provide additional points, see later slides, and provide more points initially.


DesignXplorer Excel Import Wizard

Presenter

Presentation Notes

The DesignXplorer Import Excel Wizard guides you through the steps needed to import input design parameters from Excel.


DesignXplorer Excel Import

• Data from Excel into DesignXplorer

Presenter

Presentation Notes

The import Excel data points can be used with either What-If or DesignXplorer additionally sampling.


DesignXplorer Excel Export Wizard

• Choose the file and a name for the sheet• Export in row major or column major format

Presenter

Presentation Notes

The DesignXplorer Export Excel Wizard guides you through the steps needed to export design sets to Excel.


DesignXplorer Excel Export

• Data from DesignXplorer in Excel

Presenter

Presentation Notes

Here we see the Design Point from DesignXplorer in Excel.


Parameter Manager Running Simulation from Excel

Presenter

Presentation Notes

Because the Parameter Manager is now global, it is possible to expose these parameters to other applications and drive workbench. Here we see an example of Excel driving a Workbench parametric simulation.


FE Modeler

Back to Agenda


FE Modeler Geometry Creation from FEA!

Initial Mesh

Initial Configuration in FE Modeler

Design Simulation Results

Presenter

Presentation Notes

The ANSYS Mesh Morpher is now part of DesignXplorer. Allowing parameterization of existing FE models for What-If and deterministic studies.


DesignXplorer Mesh Morhping Geometric Parameters - Parametric Stress Variations!!

Thickness increase

Diameter decrease


FE Modeler ABAQUS/Nastran Support

• ABAQUS Support– Three dimensional springs are now supported– The ABAQUS property keyword *DASHPOT is now supported– FE Modeler now recognizes ABAQUS gasket elements– Element and node parameters are now supported for the ABAQUS

general keyword *SURFACE

• NASTRAN Bulk Data Support– When importing a NASTRAN file, FE Modeler now supports an

element-level orientation angle for composite shell elements. When exporting this data, FE Modeler uses an undocumented field on the SECCONTROLS command.

– NASTRAN CBEND Element Card now supported– NASTRAN PBEND Property Cards now supported


Multi Body Dynamics

V11Major Initiative

Back to Agenda


Multi Body Dynamics

• Expansion of ANSYS Technology– Workbench/Simulation

• New analysis types (rigid dynamics, flexible dynamics)• Additional connections, loads, and results

– Core solver enhancements• Large rotation, large deflection, time stepping, etc.• Part interactions (joints, springs, contacts)

• Applicability – Rigid, flexible, and combined rigid and flexible

dynamic models• User benefits

– Ease-of-use in single user interface


Multi Body Dynamics

• Technology advances– Joints, masses, contact, and rigid representation enhancements

made to existing core solvers– New rigid body solver developed (kinematic and dynamic)– Implemented with existing Workbench principles (e.g. associative

to geometry, report generation)

• Engineering outcome– New part connections (joints, springs, in addition to contact)– Model “assembly” by configuring joints– Loads as a function of time– Common analysis setup and results processing which is

independent of solver type– Results, including joint and spring quantities, as a function of time


Multi Body Dynamics Rigid Solver

• New technology– Rigid solver

• Benefits of combined technologies– Analysis speed

• Rigid solver is fast and accurate for essentially rigid mechanisms

– Accuracy• Flexible solver is often appropriate since most real world

problems exhibit some flexibility– Emphasized ease-of-use

• One user interface with rigid and flexible capabilities• Leverages strengths and minimizes weaknesses• Simulations are more productive• Can freely change between rigid and flexible representation


Multi Body Dynamics Rigid Solver• New ANSYS rigid dynamics solver

– Very fast (via rigid abstraction rather than mesh)– Solve time typically measured in seconds, not minutes

• Used to study a only completely rigid mechanisms– All parts assumed infinitely stiff– All part interaction via defined joints– No contact

• Add-on License for • ANSYS Structural• ANSYS Mechanical• ANSYS Multiphysics

Presenter

Presentation Notes

Completely new solver, proprietary ANSYS technology, not licensed from anyone. It is much faster to troubleshoot a model using a rigid solver than and FEA solver, as the rigid solver can often solve the problem 10-200 times faster, allowing: - many more design iterations in the same time frame - nearly instant feedback on what is defined right, and what is not The new rigid dynamics solver will be accessible to those that purchase the ANSYS Rigid Dynamics product. It is not contained in any existing ANSYS product, and is exposed in the Workbench Simulation environment only.


Multi Body Dynamics Flexible Solver

• Enhancements– New joint options for MPC184– large rotations improved in

transient dynamic analyses– HHT time integration improved– Rigid parts by MPC contact– Rigid contact improved– CMS extended to static,

transient, harmonic, spectrum

• Applications– Model with rigid and flexible parts, contact

Presenter

Presentation Notes

Core ANSYS solvers in ANSYS Structural, Mechanical, and Multiphyics were improved greatly at 11.0 to handle the large rotation, large deflection, long transient requirements of a flexible body solution. When doing a flexible body dynamic simulation, you will be able to view things such as deflections, stresses, strains etc. vs. time throughout the transient, rather than just mechanism dynamics. Note that not all capabilities listed in this slide will be available via the WB interface at 11.0. Specifically, CMS won’t be until a later release.


Multi Body Dynamics Joint Types

Revolute Cylindrical

Translational Slot

Spherical

Planar

Universal

Presenter

Presentation Notes

Lots of eye candy here, animations of how the joints move and don’t move due to their inherent degrees of freedom that are free and constrained


Multi Body Dynamics Examples Multi Body Dynamics Examples

Overhead Valve Engine

Force in automotive suspension ball joint

Presenter

Presentation Notes

GE diesel engine, overhead cam design. Close up on next slide.


Elements

Back to Agenda


Elements Solid-Shell Element Analysis

Automated/manual thin shell meshing with solid-shell elements:

– No need for mid- surfacing

– Non-uniform thickness handling

Eight node SOLSH190 meshed with non-uniform thickness


Elements New Higher Order Shell

• SHELL281 based on SHELL181 framework and combines capabilities of existing composite shell elements

• May be used in 8 noded or 6 noded forms

• Capabilities– Finite strain/large rotation – All materials available– Layered composite and sandwich

shells thru shell sections– Mass inertia, Coriolis damping

terms


Elements New Rebar/Reinforcement

• REINF265 (3-D smeared reinforcement)– Large deflection, finite strain– Up to 250 layers– All material properties of current generation elements

apply– 3D visualization in graphics– Base elements can be SOLID185, SOLID186,

SOLID187, SOLSH190, SHELL181, SHELL281


Elements Smeared Reinforcement

• Tire analysisOuter Layer of the tire made of Nylon Material

Middle layer of the Tire made of Steel material

(Pink color)

Inner layer of the Tire made of

Polyester Carcass (Red color)

Rim

Representative Road surface

Tire

Predicted elastic strains


Elements Layered Solids for Composites • New layered option for SOLID185

– Implement with enhanced strain and mixed u/P formulation

– Integration with FiberSIM

Contact

Bonded Contact

F

Stringer Web

Stringer Flange

Skin

Composite lay-up definition

Example: composite stiffened panel


Elements New User Element

• USER300– Defined through API (reduces need to know

ANSYS software architecture)– Independent of ANSYS database and file

structure– Access to all ANSYS structural materials

routines– Can have its own

– DOFs– Element convergence criterion– Cutback control


Elements New Joint Types

• MPC184– Point-in-plane joint– Prismatic (translation)– Cylindrical joint– Planar joint – Weld joint – Orient joint

• Supports– Linear/nonlinear large

rotation– Linear/nonlinear

stiffness and damping– Hysteretic frictional– Stops and locks on

the free degrees of freedom

– Actuation of the joint– Static and transient


Elements Nonlinear Stabilization

• Nonlinear Stabilization– Handles local instability for nonlinear static analyses

• Material softening• Wrinkling• Deformed region unconstrained

– Adds numerical damping with dashpot at each node

• Applications– Local buckling and post local buckling within static analysis– Simulates global buckling, snap-through situations where arc-

length is not appropriate – Overcomes convergence difficulties in general

• Options– Control available (on/off) during each load step and restarts


Elements Nonlinear Stabilization


Contact

Back to Agenda


Contact Debonding• Applications

– Delamination of composites– Decohesion of surfaces bonded with adhesives,

stitches, ...• Primary interest in tension/opening• Separation behavior is described by a traction

separation law • Provides a capability for separation/opening of bonded

contact that is– independent of mesh– numerically stable– compatible with existing models with bonded contact


Contact Debonding

• Used with 2D and 3D contact elements• Supports augmented Lagrange and penalty methods• Can be used to model failure modes

– Mode I (normal) – Mode II (tangential)– Mixed mode (mode I and mode II)


Contact 3-D Line / Surface

Technology Node-to- Node

Node-to- Surface

Surface-to- Surface

Line-to- Line

Line-to- Surface

Sliding SMALL LARGE LARGE LARGE LARGEPure Lagrange Y Y Y Y Y

Augmented Lagrange Y Y Y Y YLagrange (Normal)/Penalty (Tangent)

Y Y Y Y Y

MPC Y Y Y YContact Stiffness SEMI-AUTO SEMI-AUTO SEMI-AUTO SEMI-AUTO SEMI-AUTO

Lower-Order Y Y Y Y YHigher-Order Y (2D) Y Y YRigid-Flexible Y Y Y Y Y

Flexible-Flexible Y Y Y Y YThermal Contact Y Y Y Y

Electric/Magnetic Contact Y Y Y Y


Contact Line/Line & Line/Surface


Contact For Rigid Body

• Rigid body modeling via MPC• Rigid contact uses augmented Lagrange or penalty

methods• Large deformation based MPC’s


Materials

Back to Agenda


Materials Gurson Model (Damage Plasticity)

• Process of ductile metal damage and failure includes void nucleation, growth, and coalescence

• Void growth and nucleation are strongly dependent on stress field

• Macroscopic behaviors can be predicted from development of damage at microscopic level

• May be combined with multi-linear, bilinear, and nonlinear isotropic plasticity


Materials Anisotropic Hyperelasticity

• Applicable to plane stress state for:– SHELL181– SHELL281– PLANE182 (plane stress)– PLANE183 (plane stress)

• Application– Polymers – Polymer composites– Biomaterials

A

B

C

A

B

C


Materials Granular and Powder

• Cap Drucker-Prager plasticity model applicable to – Simulation of granular materials such as soils– Powder compaction simulation– Pressure dependent plasticity of polymers

• Applicable to 2D and 3D• New addition to the existing Extended Drucker-Prager

model– Introduces cap for both tension and compression– Includes cap hardening– Includes shear envelope hardening


Materials Soil Excavation Analysis

Embankment simulationsettling of soil(i.e. displacement)

Plastic Strain

Without Reinforcements

With Reinforcements


Materials Fracture Mechanics

• Calculations such as J Integrals• Elements supported

– 2D and 3D solids (no composite sections at v11)

• Material options– Linear elasticity– Elastic-plastic material– Finite deformation– Mode I crack only (at v11)

• J-Integral calculation during solution• Pre-processing for crack setup


Materials Fracture Mechanics

• Pressurized pump housing with through crack

Crack

0

0.04

0.08

0.12

0.16

0 1 2 3 4

Path 1Path 2Path 3Path 4Path 5

Inner surface

Outer surface

J Integral calculations


Materials Initial State

• Applications in general– Residual stress/strain analysis

• Structure components subject to external/internal loading beyond the elastic limit, the components will accrue some permanent deformation after the loading is removed

– Pre-stressed reinforcement • A technique widely used in industrial applications to achieve

special mechanical performance

– MEMS (static, continues from previous state of stress)• New procedure for definition

– Replaces initial stress command (ISTRESS) with initial state (stress only at v11)


Materials Initial State

• New initial state procedure (INIST)– Ease-of-use

• Repeatable command• No element dependency

– Data definition• Element based, material based• Coordinate system (where applicable)

– Input method• Command or by a file (flexible and well formatted)

– Support most ANSYS analyses• Static, transient, modal, buckling, harmonic

– Elements supported• 180, 181, 182, 183, 185, 186, 187, 188, 189, 190, 208, 209, 281


Materials Initial State Example

Pre-Stressed beam with material based initial stress definition


Explicit Analysis

Back to Agenda


Explicit Dynamics Solutions

• ANSYS LS-DYNA– LSTC Solver technology– Long-term partnership

• ANSYS AUTODYN – New to Workbench at 11.0– ANSYS proprietary technology– Available in Workbench at 11.0

• Complementary Products– Different Application Focus


Explicit Dynamics AUTODYN 11.0 Development

• NEW - Workbench based Explicit Dynamics option

• Data sharing with other Workbench Applications

– DesignModeler– Meshing

• Default settings for Explicit– FEModeler– Advanced Meshing

• Links to Geometry– CAD based– DesignModeler created

• Persistent Parametric Model for:– Mesh density/quality studies– Design alternative studies

Bullet Impact on Light Weight

Armour System

Presenter

Presentation Notes

Development goals for 11.0 We want to create a tool that is truly useful, and doesn’t require either: - tons of engineering assumptions of dubious validity - two very separate products with separate looks and feels for doing rigid and then flexible solutions, passing files back and forth tediously


Explicit Dynamics AUTODYN Parametric Studies

DesignModeler => Meshing => AUTODYN

Modify

Geometry

Persistent Link(Retain all previous settings)

Modify

Mesh


Explicit Dynamics AUTODYN 11.0 Development

• Main New Core Features– 4 node Tetrahedral element

• Nodal pressure integration• No volume locking• Supports wide range of

mechanical materials• Validated

– Trajectory Contact (Beta)• Unique Algorithm • Energy and Momentum

Conserving– Does not require penalty

stiffness etc…– Hyperelasticity

• All volume elements

Steel Ball Impacting Ceramic Tile

(Contours of Damage)

Response of rubber seal

Presenter

Presentation Notes

Development goals for 11.0 We want to create a tool that is truly useful, and doesn’t require either: - tons of engineering assumptions of dubious validity - two very separate products with separate looks and feels for doing rigid and then flexible solutions, passing files back and forth tediously


• Example:: Hydraulic RamImpact of 12.7 mm round at 1044 m/s on an aluminium fuel tank

DesignModeler

Meshing

AUTODYN

AUTODYN® 11.0 ANSYS® WorkbenchTM AUTODYN® 11.0 ANSYS® WorkbenchTM

FE Projectile

FE Structure

Finite Volume Fluid

Automated Sliding contact

Automated Coupling (FSI)

Material Location

Pressure Contour


• Drop test of electronic device (Low velocity)

DesignModeler

Meshing


AUTODYN


• Example:: Sports equipment design


DesignModeler

Meshing

AUTODYN


Dynamics

Back to Agenda


Dynamics Rotordynamics

• Rotor dynamics is the study of rotating machines and has a very important part to play throughout the modern industrial world

• Rotating machinery is used in many applications– Turbo machines – Power stations – Machine tools – Automobiles – Household machines – Aerospace applications – Medical equipment– Computer equipment


Dynamics Rotordynamics

• Analysis Type– Static– Modal– Harmonic– Transient

• Elements/Models– Solids– Beams– Shells– Bearing/Springs– Multi-spool Rotors

• Post-Processing– Campbell Diagram– Orbit plots

Modal Analysis

Harmonic Analysis

Transient Analysis

Orbit Plots

Campbell Diagram


Dynamics Component Mode Synthesis

• CMS now supports– Modal, Static, Transient, Harmonic, Spectrum,

and substructure pre-stress analyses



• CMS now has an option for accurate representation of higher frequency modes– Residual Flexibility Free Interface Method

• CMS substructures are now supported in – Transient analysis– Harmonic analysis

Acoustic CMS Analysis



• CMS for large rotation• Applicable for nonlinear static and transient• Can be accessed from Workbench by Command

objects


Dynamics Brake Squeal Analysis

• Relative slip can be specified between rotating parts for brake squeal analysis

• Unsymmetric terms from frictional contact accounted for in eigen solver (QRDAMP)

Brake ModelUnstable Modes


Dynamics Improved Eigen solvers

• High performance eigensolver (based on VT)– Uses sparse direct solution method for the matrix

solution – The iteration loop is based on a Frequency Derivative

(FD) algorithm– V10 used a frontal solver (Lanczos)

0100020003000400050006000700080009000

10000

Elapsed CPU

LanczosFD

Solu

tion

time


Dynamics Residual Vector Method

• Method – Uses high frequency

information and can reduce simulation time compared to direct method

– Calculates effect of residual stiffness using eigen modes

• Analysis Type – Mode-superposition

• Harmonic• Transient

– CMS -2.0E-5

-1.0E-5

0.0E+0

1.0E-5

2.0E-5

3.0E-5

0 0.02 0.04 0.06 0.08 0.1

case11(direct)

case12(res-40)

Transient Response


Offshore

Back to Agenda


ANSYS and ASAS

• ANSYS Data into ASAS– Create ASAS model files from ANSYS

• ANStoASAS macro supplied with installation– PREP7 or Workbench.

• ASAS-WAVE loading created from ANSYS PIPE59 Element.

• AQWA-WAVE compatible ASAS file can be created with compatible pressure loads to identify the wetted surface elements

– Perform offshore structure code assessments using ASAS toolbox


ANSYS and AQWA

• ANSYS Data into AQWA– Create AQWA model files from ANSYS

• ANStoAQWA macro supplied with installation– PREP7 or Workbench.

– Perform hydrodynamic analysis on offshore structures


ANSYS and AQWA

• AQWA Loads into ANSYS– Hydrodynamic loading applied to an ANSYS

model• Plate and shell structures• Pressures calculated by AQWA-LINE using

diffraction/radiation theory

ANSYS Stress plot

courtesy of Vuyk Engineering Rotterdam

Hydrodynamic pressure loading in AQWA


Thermal Analysis

Back to Agenda


Thermal Analysis General Enhancements

• Heat generation rates– Input as element body loads on convection link (LINK34)

elements• Multi-frame restarts

– With the thermal solver (THOPT,FULL)– Fast thermal solver (THOPT,QUASI)

• 1D fluid element (FLUID116) table material properties– Can be function of pressure, temperature, velocity, time, and

location• Thermal mass (MASS71) table for heat generation

– Can be function of time, temperature, and location• Temp DOF from 1D fluid element (FLUID116) can be used as

bulk temperatures for a film coefficient boundary condition on layer shell elements (SHELL131/SHELL132 DOFs: TTOP, TBOT, etc.)


Thermal Analysis HTI Products

• Icechip– Model generation nearly ten times faster– Package-on-Package simulation

• Iceboard– 3D voltage drop simulation accounting for losses in

traces, planes and vias– A simplified board can be exported to Icepak– A direct interface has been developed with Cadence

Allegro


Coupled Physics Analysis

Back to Agenda


PLANE2232-D 8-node

quadrilateral

SOLID2263-D 20-node

brick

SOLID2273-D 10-node tetrahedron

22x Coupled-Field Analyses

• Direct coupling of electric and structural physics for MEMS– For dielectric material– “Elastic” air to deform the mesh

• Coriolis effects included– Applications

• Gyroscopes• Accelerometers

• INFIN110 and INFIN111 elements have been enhanced to model far-field decay in electric conduction analysis


Compliantelectrode

Electro-Elastic Strain

0

0.05

0.1

0.15

0.2

0.25

-200 -150 -100 -50 0 50 100 150 200

Electric Field, E (MV/m)

Indu

ced

Stra

in, S

x (%

)

• A voltage is applied between the electrodes

• Electrostatic pressure arises

• Elastomer compresses in the thickness and expands in the plane directions

Elastomericmaterial

Coupled Physics Analysis Dielectric Elastomer Actuator


• A clamped beam for an RF MEMS switch is modeled to compute the center deflection for an applied voltage

• Forces generated by the electrostatic field will bend the beam towards the ground plane

“Elastic air”

Dielectric beam

Air gap = 5 μm

Ground plane

Coupled Physics Analysis Electrostatically Actuated Beam

© 2007 ANSYS, Inc. All rights reserved. 100

ANSYS, Inc. Proprietary

• A piezoelectric gyroscope for an angular rate sensor is excited into an in-plane vibration by applying an alternating voltage at f=32728 Hz

• The tuning fork is rotated around the axis parallel to the tines

0 Volt

1 Volt

Coupled Physics Analysis Piezoelectric Vibratory Gyroscope



• INFIN110 and INFIN111 elements have been enhanced to model far-field decay in electric conduction analysis

Layer of INFIN111 elementsVoltage source

SOLID232 mesh

INF boundary

Electric potential distribution

Coupled Physics Analysis Electric Analysis with Open Boundaries



High Frequency EMAG

Back to Agenda



HF Emag Advanced Material Models

– Permittivity Tensor [εr ]– Permeability Tensor [μr ]– Electric Current Conductivity Tensor [σe ]– Magnetic Current Conductivity Tensor [σm ]– Magnetic Lossy Tangent– Ferrite

• Links to magnetostatic solver for magnetic field solution



HF Emag S-Parameter Enhancements

• S-Parameter Adaptive Meshing Solution– Perform adaptive iterations until the s-

parameter convergences to required criteria by automatically refining mesh

– Multi-port for adaptive implementation– Direct and iterative solver in solution



HF Emag Time Domain Reflectometry/Transmission

• Time Domain Reflectometry (TDR) and Time Domain Transmission (TDT)– Display the waveform of the reflection wave and transmission

wave at ports in time domain, based on frequency-domain S- parameter results

– Display the total waveform at input port– Display the time-domain impedance at port– Impulse and step signal source

FrequencyDomain

TimeDomain



LF EMAG

Back to Agenda



LF Emag Adaptive meshing LF Emag Adaptive meshing

• In Workbench and ANSYS



LF Emag Periodic boundary conditions LF Emag Periodic boundary conditions

• Available in Workbench



High Performance Computing

Back to Agenda



High Performance Computing Agenda

• New modal solver: LANPCG– Efficient and Robust– SMP and Distributed

• Single Precision Option for CG calculation– Can now use PCG for ill-condition problems

• Sparse solver robustness• Distributed Sparse solver scalability• Distributed Scalability Enhancements

– Better load balancing• New Platform Support

– Windows 64, MPICH2.0– Micrsoft Compute Cluster Server 2003, MS-MPI

• VT accelerator– Now available for non-linear static and transient stress/thermal

Presenter

Presentation Notes

Mention that Sturm check does factorization, which defeats the purpose of LANPCG iterative method.



SMP ANSYS Enhancements New Modal Solver

• New modal solver: LANPCG– Block Lanczos with PCG solver (LANPCG)– Reduce file sizes and I/O requirements– Very robust– Efficient for larger problems (>1,000,000 dofs)

Presenter

Presentation Notes

Mention that Sturm check does factorization, which defeats the purpose of LANPCG iterative method.



SMP ANSYS Enhancements LANPCG performance

75291

8,080,601382,492

5,438,0050

24,241,803

Number of Parts Contact PairsNodesCONTACT ElementsSOLID186/187 ElementsCEsNo. of Equations (dofs)

SGI Altix server using six 1.5 GHz Itanium-2 processors on Linux 64- bit OS (SUSE LINUX Enterprise Server 9) with ANSYS 11.0

Presenter

Presentation Notes

This is the suspension model.



Distributed ANSYS (DANSYS) New Distributed LANPCG

• New Distributed modal eigensolver, LANPCG



Axle Model: Decomposer Enhancements

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

PCG -1 DPCG -2 DPCG -4 DPCG -6 DPCG -8

Number of CPUs

Spee

d U

p Fa

ctor

10.0 Speed Up

10.0 SP1 Speed Up

11.0 Speed Up

Distributed ANSYS (DANSYS) Improved Load Balancing

Presenter

Presentation Notes

Here we see the dramatic improvements made in both interface minimization and load balancing. In this particularly troublesome problem, we had reasonable load balance, but had created extensive interfaces, creating much more data transfer than necessary. At 10.0 SP1, we made some modest improvements, but with plenty of additional work to be done. At 11.0, we achieve great load balance while also maintaining the minimum interface necessary to solve the problem, providing significant Speed Up on a problem that at 10.0 had none!



VT Accelerator Optimization for Transients

• Variational Technology (VT)– Expanded to speed up

• Nonlinear static and transient structural solutions not involving contact or plasticity

• Nonlinear static and transient thermal analyses

– Makes solutions 2x to 5x faster for initial solutions– Makes resolves 3x to 10x faster for parameter

changes such as material properties, loads, film coefficients, etc.

• DOE can now potentially be applied to more complex solutions; not just linear static analyses



VT Accelerator Example• 288,727 elements• 456,635 nodes• Convections with temp

and time dependency

0.00

200.00

400.00

600.00

800.00

1000.00

1200.00

1400.00

0 200 400 600 800 1000

Physical time (s)

Tem

pera

ture Initial VT (full checks)

Quasi ICCGFull PCG - no VT

All results in good agreement(deviation < 1.5%)

Florida Turbine Technologies



VT Accelerator Example Parameters • Applied temperature and time

dependent film coefficients, bulk temperature

• Variations on film coefficients around top of the blade – Parametric change 1: scaling

80%– Parametric change 2: scaling

60%• Variation on time history for

film coefficients & bulk temp– Parametric change 3: same as 2

+ time history stretched

Film Coefficient vs Time

0

50

100

150

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Physical time (s)

InitialParametric 1Parametric 2Parametric 3

Bulk Temperature

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Run without VT156 Cumulative iterations

Elapsed time = 2750 s

Run with VT30 Cumulative iterations

Elapsed time = 775 s

VT Accelerator Example Solutions




Summary

• ANSYS Mechanical Technology– Innovating engineering simulation

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Ansys Mech Technology v11

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Transcript of Ansys Mech Technology v11