ansys rotordynamics beac… · 1 © 2011 ansys, inc. 8/29/11 ansys rotordynamics. 2 © 2011 ansys,...
TRANSCRIPT
© 2011 ANSYS, Inc. 8/29/111
ANSYS Rotordynamics
© 2011 ANSYS, Inc. 8/29/112
Introduction
Benefits of Using ANSYS
Continual Enhancements
Analysis Types
Rotordynamics in ANSYS WorkbenchRotordynamics Documentation
Summary and Questions
Outline
© 2011 ANSYS, Inc. 8/29/113
Many industries use machines with rotating components
• Power generation, transportation, electronics, chemical processing
Comprehensive design of rotating components, using high-fidelity tools, is essential to achieve machine reliability, stable range of operation, low noise at desired speeds and loads etc.
• Turbomachinery, mixers, disk drives, generators etc.
ANSYS has expanded its rotordynamics capability to offer integrated solutions to all such industries and machine types
Introduction
© 2011 ANSYS, Inc. 8/29/114
Complete rotordynamics analysis with ANSYS, enabled by….
• CAD import and automatic meshing
• Library of elements• All analysis types (including
pre-stress)• Dedicated post-processing• Multi-spool dynamics
simulation• Direct connection to bearing
codes• Account for the flexibility of
the supporting structure and/or the disks
• Connect directly to other ANSYS tools via Workbench (DesignXplorer)
Benefits of Using ANSYS
© 2011 ANSYS, Inc. 8/29/115
Continual Enhancements
© 2011 ANSYS, Inc. 8/29/116
Release 10.0 Enhancements
New Features Commands
Activate gyroscopic effect at solver level CORIOLIS
Specify rotational velocity for full model and components
OMEGA CMOMEGA
Develop Campbell diagram PRCAMPPLCAMP
Include gyroscopic effect with LINE and MASS elements
MASS21BEAM188 BEAM189
© 2011 ANSYS, Inc. 8/29/117
New Features Commands
Include gyroscopic effect with SOLID elements
SOLID185SOLID186SOLID187
Perform a harmonic response to synchronous and asynchronous excitations
SYNCHRO
Perform Campbell analysis of a pre-stressed structure CAMPBELL
Visualize and printout the orbits characteristics
PLORB PRORB
New variable bearing element COMBI214
Release 11.0 Enhancements
© 2011 ANSYS, Inc. 8/29/118
Release 12.0 Enhancements
New Features Commands
Include gyroscopic effect with SHELL elements
SHELL181SHELL281
Replace damped eigensolver with faster and more accurate solver
MODOPT, DAMP
Improve performance for large models (1 Mdof) in reduced damped eigensolver
MODOPT, QRDAMP
Include gyroscopic effect with new generation axi-harmonic elements
SOLID272SOLID273
Add dedicated Rotordynamics Guide
Documentation
© 2011 ANSYS, Inc. 8/29/119
Release 13.0 Enhancements
New Features Commands
New APDL Math extends APDL scripting capabilities *EIGEN
Damped (MODOPT,DAMP) extraction method supported in Distributed ANSYS
MODOPT, DAMP
QR damped (MODOPT,QRDAMP) eigensolver now reuses existing undamped modes
MODOPT, QRDAMP
Linear Perturbation enables a modal analysis to use the tangent stiffness matrix at any point in a previous analysis
PERTURB
*SMAT, K, D, IMPORT, FULL, file.full, STIFF*SMAT, M, D, IMPORT, FULL, file.full, MASS*SMAT, G0, D, IMPORT, FULL, file.full, DAMP
*SMAT, zMG0, Z, COPY, M*AXPY,, alpha, G0, 1,, zMG0*SMAT, zK, Z, COPY, K
/SOLUANTYPE, MODALMODOPT, UNSYM, 6*EIGEN, zK, zMG0,, EiV, EiMFINIreduced processor time for large
models
better performance for Campbell Diagram generation
more general method for rotordynamics pre-stress modal analysis
© 2011 ANSYS, Inc. 8/29/1110
Support in Workbench Mechanical for:
• Campbell Diagrams• Full Damped, Reduced Damped solvers• Animation with Decay• Rotational Velocity with Coriolis Effect• Post-process Multi-step modal analysis
Release 14.0 Enhancements
© 2011 ANSYS, Inc. 8/29/1111
Analysis Types
© 2011 ANSYS, Inc. 8/29/1112
Modal Analysis
Orbit Plot
Complex Frequency Printout
Specify the rotational velocity and activate
the Coriolis effect
Deformed ShapeAnimation
© 2011 ANSYS, Inc. 8/29/1113
Modal Analysis – Campbell Diagram
Set up a Multiple Load Step Modal
Analysis
Frequencies - Whirls - Stability
Critical Speeds
Logarithmic Decrement
© 2011 ANSYS, Inc. 8/29/1114
Harmonic Analysis – Unbalance Response
Specify the Unbalance Force on Inner Spool
Orbit PlotUnbalance Response
© 2011 ANSYS, Inc. 8/29/1115
0 0.5 1 1.5 2 2.5 3 3.5 40
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
Time (s)
Rot
atio
nal v
eloc
ity (
rpm
)
Transient Analysis 1
Start-up and Stop Simulation
Transient Response
Specify the Rotational Velocity
vs. Time
© 2011 ANSYS, Inc. 8/29/1116
Transient Analysis 2
Stability Verification
Transient Orbits
Specify a Short Duration Force
© 2011 ANSYS, Inc. 8/29/1117
Rotordynamics in ANSYS Workbench
© 2011 ANSYS, Inc. 8/29/1118
Rotordynamics in ANSYS Workbench
Bearings
Initial 3D geometry
Final axisymmetric model
Model consists of• Shaft• Disk• Bearings
Disk added
© 2011 ANSYS, Inc. 8/29/1119
Rotordynamics in ANSYS WorkbenchProject view in ANSYS
WorkbenchSimulation process
GeometryMesh
Simulation
Design Exploration
Tools
Parameters: geometry &
bearing stiffness
© 2011 ANSYS, Inc. 8/29/1120
Mesh & Model Mesh
Axisymmetric model with boundary conditions
Expanded view
© 2011 ANSYS, Inc. 8/29/1121
Simulation & Results
Campbell Diagram
Critical speeds
Mode visualization(animation with
decay)
© 2011 ANSYS, Inc. 8/29/1122
Design Exploration
• Input parameters– Disk radius– Shaft radius– Bearing stiffness
• Output parameters– Critical speeds
Automated parametric investigation
Sensitivity plots
© 2011 ANSYS, Inc. 8/29/1123
Multi-objective Optimization
Specify “Seek Target” for Optimization
© 2011 ANSYS, Inc. 8/29/1124
Rotordynamics Documentation
© 2011 ANSYS, Inc. 8/29/1125
Rotordynamics Analysis Guide
Analysis Guide specific to
Rotordynamics
© 2011 ANSYS, Inc. 8/29/1126
Technology Demonstration Guide
© 2011 ANSYS, Inc. 8/29/1127
SummaryThe previous slides have described the elements
of complete rotordynamics analysis, with ANSYSØ Key enabling features:
– CAD import and automatic meshing– Library of elements– All analysis types (including pre-stress)– Dedicated post-processing– Multi-spool dynamics simulation– Direct connection to bearing codes– Account for the flexibility of the
supporting structure and/or the disks– Connect directly to other ANSYS tools
via Workbench (DesignXplorer)Ø The result: Faster, more complete and accurate machine analysis… with ANSYS
© 2011 ANSYS, Inc. 8/29/1128
Questions?