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ANSYS WorkbenchDynamicsv11.0
ANSYS WorkbenchDynamicsv11.0
Tim Pawlak
ANSYS, Inc.
Tim Pawlak
ANSYS, Inc.
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IntroductionIntroduction
• Dynamics background
– ANSYS long established
flexible dynamic capabilities
– Major v11 development theme
• Objectives
– Improved existing capabilities
– Established new capabilities
– Achieve mechanism simulation
– Combine advantages of rigidand flex representations
– Offer exceptional product
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ModelModel
• Geometry import as usual
– Associative
– Parametric
• Stiffness types
– Flexible• Usual 3D meshed models
• Nonlinear materials allowed – Rigid
• Limited to single body parts
– Flexible Beam (beta)
• Avoids over constraint• Solution time shorter
• Limited to single body parts
– Mixtures of rigid and flexible parts
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Joints and Coordinate SystemsJoints and Coordinate Systems
• Joints
– New way to connect parts
– Associative to geometry
– Between two parts or part to ground
• By faces
• By edges and vertices (beta)
–
Have up to two coordinate systems• Reference
• Mobile (optional)
• Coordinate systems
– Inherent to joint definition
– Associative to geometry
– Geometry based construction
– Options for precise positioning
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Joint TypesJoint Types
• Fixed
• Revolute
• Translational• Slot
• Cylindrical
• Universal
• Spherical
• Planar
• General
• 6 Degrees of Freedom
• Combinations of fixed and free
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ConfigureConfigure
• Model assembly
• Interactive real time operation
–
To validate mechanism definition• Graphical joint DOF triad
– Mouse pick selection to locate and orient
• Set position
– Useable for all analysis types
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Analysis TypesAnalysis Types
• New way of categorizing analyses
– Not input and output driven
–
Objective driven• Clearly delimitates capabilities
• Links analyses and transfers data
• Joints applicable to
– Static Structural
– Flexible Dynamic
– Rigid Dynamic
– Modal
– Harmonic (beta)
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Flexible Dynamic Analysis TypeFlexible Dynamic Analysis Type
• Finite element formulation of geometry and
equations for motion
• 9 joints types
• Longitudinal spring/damper
• Torsional spring/damper (beta)• HHT implicit transient time solver
• Time history displacements, velocities,
accelerations, forces, stresses, etc.
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Rigid Dynamic Analysis TypeRigid Dynamic Analysis Type
• Relative degree of freedom formulation of
geometry and equation of motion
• 9 joints types
• Longitudinal spring/damper
• Torsional spring/damper (beta)• Runge Kutta explicit time solver
• Time history displacements, velocities,
accelerations, forces, etc.
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General Load InformationGeneral Load Information
• Types
– Constant, table, function
• GUI controls for defining loads – Details view
– Timeline
– Tabular data
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General Load InformationGeneral Load Information
• Types
– Displacement/Rotation
– Velocity
– Acceleration
– Force/Moment
• GUI operations in timeline ortabular data
– Activate/Deactivate
– Multi select
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Rigid Dynamic LoadsRigid Dynamic Loads
• Methods
– Primarily by joint conditions
– Optionally to parts by using joint to ground
• With appropriate DOFs free (even all DOFs free)
• Requirements
– Mechanism must be ground in some manner
–
Free floating parts can be represented by a general joint toground with all DOFs free
• Table loads
– Data points are fit within load step, but not between load steps
– Curve display is piecewise linear (i.e. fit is not shown)
– Warning issued if fit is inappropriate
• Inappropriate is area under fitted curve differs significantly fromarea under piecewise linear curve
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ResultsResults
• Data
– Saved in files managed
by the WB project
system (.rst and .mbd)• Probes
– Deformation, position,
rotation (beta), velocity,
angular velocity,acceleration, angular
acceleration, energy,
force, moment
• Force and moment – Graphic indication by
arrow
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ResultsResults
• Charts
– Useful for comparisons of tabular data (loads and results)
– Normalizes data when of dissimilar type
– Applicable to objects within the same model branch
• And across model branches (beta)
• Timeline “Zoom to Range”
– Useful for detailed investigation of tabular data
– Horizontal and vertical zoom (vertical beta)
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Strategy RecommendationsStrategy Recommendations
• Utilize options that parts canbe rigid/flexible
• Remember that there are
more options now forconnecting parts
• Build up the mechanism partby part
• Operate the mechanism
interactively to validate itsbehavior before launchingsolution
• Consider the flex beamoption because it is typicallyquicker and avoids over-constraint
• Leverage strengths of rigidand flex solvers
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CMS Flexible RepresentationCMS Flexible Representation
• CMS stands forComponent ModeSynthesis
• Linear approach torepresent part flexiblyusing 3D mesh at
reduced computationalcost
• Similar to superelement approach
• Available in the ANSYSsolver
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CMS within WorkbenchCMS within Workbench
• Analysis Types
– Dynamic
– Static
• Made possible by
Command objects
• Named Selection used togroup mesh
– Variable to activate
convenient grouping• Results available for post
processing Vane Example
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CMS Vane Deform vs. Regular CMS Vane Deform vs. Regular
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CMS Vane Stress vs. Regular CMS Vane Stress vs. Regular
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CMS Joint Force vs. Regular CMS Joint Force vs. Regular
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Computation Time ComparisonComputation Time Comparison
CMS
Release 11.0BETA
UP20061004
INTEL NT
Maximum Scratch Memory
Used = 45.966 MB
CP Time (sec) = 27.281
Elapsed Time (sec) = 56.000
Date = 10/05/2006
Regular
Release 11.0BETA
UP20061004
INTEL NT
Maximum Scratch Memory
Used = 43.744 MB
CP Time (sec) = 124.312
Elapsed Time (sec) = 137.000
Date = 10/05/2006
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CMS Landing Gear ExampleCMS Landing Gear Example
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CMS Landing Gear Close-UpCMS Landing Gear Close-Up
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CMS SummaryCMS Summary
• Available in WB
via Commands
• Enablessignificant
computational
efficiency
• Limited to linear
materials
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Miscellaneous Features IMiscellaneous Features I
• Automatic joint generation
– Based on geometry (similar to auto contact generation)
– Finds candidate revolute and fixed joints
• User preferences
– Automatic joint and/or contact generation “on” or “off”
• Graphics window RMB (right mouse button)
–
Go To (bodies, joints, etc.) – Disable Transparency
– Hide All Other
– Flip Reference/Mobile
– Body Views• Standard, reference, and mobile windows
• Isolates the parts involved in a joint
Mi ll F t II
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Miscellaneous Features IIMiscellaneous Features II
• Over constraint “Joint Checker” (partially beta)
– Estimate of mechanism available degrees of freedom
– Estimate of individual joint DOF condition
( )P d t P k i (T t ti )
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Product Packaging (Tentative)Product Packaging (Tentative)
• ANSYS Dynamics Productivity Pack*
– WorkBench enabled task add-on for
• ANSYS Structural• ANSYS Mechanical
• ANSYS Multiphysics
– Not available as standalone
– Enables
• Joint construction
• Configure feature
• Rigid Dynamic analysis type
– Advantages
• Flexible and rigid dynamics capabilities in a single system
* Name subject to change
F tF t
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FutureFuture
• Joints
– Stops and locks
– Friction
– Stiffness
– Events
– Hydrodynamic bearings
– Gears
– Cable and pulleys
• Contact
– For rigid bodies
• Diagnostics
– Callout where and why mechanism numerically fails
• Leverage combination
– Share constraint info from rigid solver to flex