Flexible Body Simulation€¦ · · 2015-11-11" Loads process for transparent and precise stress recovery ... " User Interface example for Abaqus: Flexible Body Simulation *SUBSTRUCTURE

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014 Flexible Body Simulation

Martin Schulze

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014 Overview

Flexible Body Simulation

u  Introduction to FE Interfaces in Simpack w FlexModal w SIMBEAM

u  New Features for Flexible Body Simulation w  Improvements of FE interfaces for linear substructures w New methods for embedding nonlinear structures

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014 FlexModal


u  Example: w  rotorblade

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014 FlexModal

u  Assign linear flexible substructures to Simpack bodies: w  Interfaces to Abaqus, NASTRAN, ANSYS, Optistruct, RADIOSS w Two-step reduction process ensures optimal balance between

computational speed and result accuracy w Optional inclusion of 2nd order effects (e.g. stress stiffening) w Loads process for transparent and precise stress recovery w  Interfaces to external durability and acoustic analysis tools w Ease-of-use: choose a model, select modes and adjust damping

properties


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014 SIMBEAM


u  Example: w  rotorblade

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014 SIMBEAM

u  Assign beam models to Simpack bodies: w Fully integrated modelling environment for beam structures w Seamless integration into Simpack solver methodologies w Variety of standard and user defined cross section types w Automatic consideration of 2nd order effects (e.g. shortening) w Linear variable cross sections for enhanced accuracy w Ease-of-use: define nodes, elements, cross sections and

material, select modes and adjust damping properties


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014 Overview


u  Introduction to FE Interfaces in Simpack w FlexModal w SIMBEAM

u  New Features for Flexible Body Simulation w  Improvements of FE interfaces for linear substructures w New methods for embedding nonlinear flexible structures

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014 New: Local Damping in SIMPACK (9.9)

u  Import reduced damping matrices of FE substructures (Abaqus, ANSYS, MSC NASTRAN and NX NASTRAN): w Used for gaskets, bolted connections, etc. w On/off switch and scaling w User Interface example for Abaqus:


*SUBSTRUCTURE GENERATE, TYPE=Z001, MASS MATRIX=YES, VISCOUS DAMPING MATRIX=YES, RECOVERY MATRIX=YES, NSET=recoveredNodes, OVERWRITE, LIBRARY=<body_name>.simp

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014 New: Substructure Matrix Manipulation (9.8)

u  Enable application of the following manipulations to a reduced FE model: w Scaling of mass and stiffness matrices w Definition of additional lumped masses w Definition of linear point-to-point springs w Optimization of a flexible part’s design


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014 New: Initial FEA Preloads Used in Loads Process (9.9)

u  Extend Simpack’s highly accurate static and dynamic stress computation capability: w Consider stress due to constant pre-loads

(e.g. bolted connections) w Constant stress considered in contouring,

stress export and durability calculation


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014 New: Improved handling of Distributed Loads (9.9)


u  Consider distributed loads from force elements in the Loads Process (e.g. gear pair)

u  Enable force application onto SIMBEAM surfaces w Optimized for flexible contact w Consistent formulation using FE shape functions w Used e.g. by new Hydrodynamic Bearing element

SIMBEAM shaft model

Hydrodynamic Bearing

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014 New: Interface to Acoustics Software (9.9)

u  Enable use of acoustics software as additional post processing step: w Export of mode shapes into op2 or universal files in

SIMPACK Pre w Export of mode amplitudes into universal files in

SIMAPCK Post w Export of surface normal velocities in time and

frequency domain in SIMPACK Post w Read & process data in external acoustics software

(e.g. SYSNOISE, ACTRAN)


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014 New: Non-linear SIMBEAM (9.7)

u  Enable accurate modelling of large deformation in beam structures: w Transparently switch between “classic” and non-linear

SIMBEAM w Directly computes node displacements w Based on Geometrically Exact beam formulation


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014 New: Improved Access to Cross Section Forces (9.9)

u  Simplified reviewing of beam cross section forces also for “classic” SIMBEAM: w Directly accessible as channels in result tree in Post w Values calculated per-element, equivalent to FE


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014 New: Abaqus SIMPACK Co-simulation (9.9)

u  Enable arbitrary non-linear deformation behaviour of Flexible Bodies via co-simulation: w SIMPACK coupling with Abaqus/Explicit w Enables flexible bodies with large non-linear

deformation, plastic deformation, friction, etc.


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014

Documents

Flexible Body Simulation€¦ · · 2015-11-11" Loads process for transparent and precise stress recovery ... " User Interface example for Abaqus: Flexible Body Simulation *SUBSTRUCTURE