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LMS Virtual.Lab

What’s New in Rev 11

by

LMS INTERNATIONAL

Interleuvenlaan 68, B-3001 LEUVEN, Belgium

Copyright © 2012 by LMS International

All rights reserved. No part of this publication may be reproduced, stored in a retrieval

system, or transmitted, in any form or by any means, electronic, mechanical, photocopying,

recording or otherwise, without the written permission of LMS International N.V.,

Interleuvenlaan 68-70, B-3001 Leuven, Belgium.

REGISTERED TRADEMARKS

LMS Virtual.Lab is a registered trademark of LMS International N.V.

Component Application Architecture (CAA) is a registered trademark of Dassault Systèmes

All other trademarks acknowledged.

LMS Virtual.Lab Rev 11

Table of Contents Page 3 of 23

1 Table of Contents

1 Table of Contents.................................................................................................... 3

1 What’s New for Rev 11............................................................................................ 7

1.1 All LMS Virtual.Lab Workbenches ................................................................... 7

1.1.1 Edited load function in local axes............................................................. 7

1.1.2 Edited load function: import a curve from a 2D display ............................ 7

1.1.3 MathData Processing method to convert function to local axes ............... 7

1.1.4 Function data import from multiple files at once ....................................... 7

1.2 LMS Virtual.Lab Motion ................................................................................... 7

1.2.1 Composer................................................................................................ 7

1.2.2 Vehicle Dynamics .................................................................................... 8

1.2.3 Co-simulation Enhancements .................................................................. 8

1.2.4 Xml Import/Export .................................................................................... 9

1.2.5 Non-linear Flexible Bodies ....................................................................... 9

1.2.6 Transmission Modeling ............................................................................ 9

1.2.7 General Enhancements ........................................................................... 9

1.3 LMS Virtual.Lab Acoustics............................................................................. 10

1.3.1 Vibro-Acoustic Structural Solver ............................................................ 10

1.3.2 Coupled Noise Transfer Functions......................................................... 11

1.3.3 Coupled Modes ..................................................................................... 11

1.3.4 Improvement of Panel Transmission loss process ................................. 11

1.3.5 Meshing for FEM Acoustics ................................................................... 12

1.3.6 New parallelization of solvers................................................................. 12

1.3.7 Ray Acoustics extensions ...................................................................... 13

1.3.8 Coupling of non compatible meshes ...................................................... 14

1.3.9 New Aeroacoustic Dipoles ..................................................................... 15

1.3.10 ATILA coupling ...................................................................................... 15

1.3.11 JMAG coupling ...................................................................................... 15

1.3.12 Modeling of Shear layers ....................................................................... 15

1.3.13 User DLL for the crosspower set............................................................ 16

1.4 LMS Virtual.Lab Noise & Vibration and Correlation ....................................... 16

1.4.1 Kinematic Connections for System Level NVH ...................................... 16

1.4.2 Rigid Coupling to Ground....................................................................... 16

1.4.3 Inverse Load Identification with missing DOFs....................................... 16

1.4.4 Vector Loads for Modal Based Forced Response.................................. 17

1.5 LMS Virtual.Lab Durability ............................................................................. 17


Page 4 of 23 Table of Contents

1.5.1 General.................................................................................................. 17

1.5.2 Seam Welds .......................................................................................... 17

1.5.3 Combined Events Case ......................................................................... 18

1.5.4 New mean stress Influence method....................................................... 18

1.5.5 New mean stress Influence method....................................................... 19

1.5.6 Composite Fatigue - Extension of the external material definition .......... 19

1.6 LMS Virtual.Lab Structures............................................................................ 19

1.6.1 General.................................................................................................. 19

1.6.2 Fine durability spot weld ........................................................................ 20

1.6.3 Nastran pre/post .................................................................................... 20

1.6.4 Nastran SOL200 pre/post ...................................................................... 21

1.6.5 Abaqus pre/post .................................................................................... 21

1.6.6 Radioss pre/post.................................................................................... 21

1.6.7 Assembly............................................................................................... 22

1.7 FE Interfaces................................................................................................. 23

1.8 LMS Virtual.Lab Batch Meshing .................................................................... 23

1.9 LMS Virtual.Lab Optimization ........................................................................ 23


What’s New for Rev 11 Page 7 of 23

1 What’s New for Rev 11

1.1 All LMS Virtual.Lab Workbenches

1.1.1 Edited load function in local axes

It is now possible to edit a load function in a local axis. If one wants to for

example define in a node a force load of 10N along a direction that does not

coincide with one of the global X, Y, or Z axes, one can define first a nodal

results axis system where one of the local axes (say Y) is oriented in the right

direction, then define the load with a value of 10N, and then select in the

Attributes tab of the function editor the Local Axis System and the Y DOF. See

the online help topic “Editing Functions with the Editor” for more details.

1.1.2 Edited load function: import a curve from a 2D display

While editing a load function, one can now import a curve that is displayed in

some 2D display (just like one can import values from an Excel file for

example). The imported values will even include the post-processing (like

acoustic weighting for example) that was applied from the “Data Select” dialog

box of the display.

1.1.3 MathData Processing method to convert function to local axes

The MathData Processing case has a new method “Geometrical

Transformation” that makes it possible to convert a function set from local to

global axes or vice versa. See the online help topic “MathData Processing

Case” for more details.

This allows you for example to export functions that are expressed in some

local axes from LMS Virtual.Lab to external files, e.g. universal files.

1.1.4 Function data import from multiple files at once

When importing functions from a file (Universal, Excel, punch,K) under the

data source of a function set, it is now possible to select multiple files at once,

which will then all be imported with the same options as set in the import dialog

box.

1.2 LMS Virtual.Lab Motion

1.2.1 Composer

A tool that will now enable a user to create custom tailored apps with a

dramatic reduction in VB programming effort and time. The tool allows for

drag and drop customization to generate higher level VB commands.

Note: There will be new features in the Rev 11 SL1 release that may force you

to make manual updates to your Composer-based session and application

data.


Page 8 of 23 What’s New for Rev 11

1.2.2 Vehicle Dynamics

• New Driving Dynamics Vertical:

A dedicated vertical for driving dynamics created using the Composer. By

creating the application with the Composer you can capture the full

customer process between methods specialists and end users. The

Driving Dynamics Vertical provides an intutitive GUI to define out-of-the-

box parameterized Motion templates for suspensions and full vehicle

assemblies. It is also equipped with pre-defined analyses for suspensions

K&C and full-vehicle handling and ride comfort assessment.

• Motion Publication enhancements:

These enhacements will improve model template creation and

management by allowing the user to pass position/orientation of Motion

Axis Systems between submechnisms.

• Support of Motion Axis Systems in Vehicle:

By offering this capability the modeling process can be improved by

creating axis systems that can be shared between submechnisms. This

can be done in cooperation with the previous enhancement to Motion

Publications.

• Static Vehicle Alignment:

Provides for an automatic method for alignment of simulation and target

values (toe, caster, & camber). Alignment is achieved instantaneously

through use of dedicated solver routines to adjust DOF to achieve target

values.

• Leaf Spring Module:

A new dedicated leaf spring pre-processing module replaces the manual

process of model construction. The GUI allows for quick leaf spring model

creation using individual leaf properties that captures inner leaf friction.

1.2.3 Co-simulation Enhancements

• With Matlab – Motion as master

For users receiving a controls system from a supplier, this feature allows

the user to couple the system in the Motion model. Motion will be viewed

as the master and the Matlab model will be imported into the LMS

Virtual.Lab environment.

• Modelisar

This functionality has been added to create a universal co-simulation

environment based on the Modelisar standard. This allows individual

components to be simulated by different simulation tools. The Motion

solver has been setup to follow the Model Exchange standard set forth by

the standard.



• With AMESim – Motion as master

Extends the coupling capabilities with AMESim by including Co-simulation

from the Motion environment. This allows Motion experts to do both

coupling and co-simulation methods from their environment.

1.2.4 Xml Import/Export

The model definition can now be described in a text based (XML) file format.

This allows for the model files to be human readable and editable. It also

provides for a simpler, non-proprietary model archive format.

1.2.5 Non-linear Flexible Bodies

Certain components in mechanical systems experience non-linear

deformations during operation. This new Co-simulation allows for coupling the

LMS Motion multi-body dynamics solver with the LMS Non-Linear Flexible

Body Solver. This will provide the user to extend the model fidelity to capture

the non-linear effects in components, such as a twist beam axles, torsion bars,

and springs.

1.2.6 Transmission Modeling

The Gear Contact functionality has been extended to be applicable to both

manual and automatic transmissions. The additional functionality allows for a

gear to be represented with a flexible body and to take into account the

planetary phasing for automatic transmissions - both are critical for accurately

capturing the vibrations generated by the transmission.

1.2.7 General Enhancements

• Mass & Inertia properties of group of bodies

Pre-processing feature to verify the lumped mass of multiple bodies

regardless of the individual body’s mass definition: Rigid, User-Defined,

Flexible or Spline Beam. The resultant properties can also be applied to

any body in the model.

• Spline beam enhancements

The mass properties are reported in the Spline Beam dialog to allow you to

more easily verify you are using the correct mass properties in your spline

beam representation. The definition has also been extended to allow

damping to be defined as viscous or structural.

• Bumpstop animation

The Bumpstop feature allows the user to graphically display the maginitude

of the force during jounce/rebound impacts.

• Sphere-to-CAD contact



Contact library has been extend to include sphere to CAD contact. The

sphere body can be defined as a super element as in the other standard

contact definition. This adds to the array of options to define contact

between two bodies.

• Make body flexible without modifying CAD Product nor Flexible Analysis

document

When it is not possible to modifiy the CATIA product structure this

capability allows the user to define a body as flexible without such

modification. This does require a previously defined product and correctly

defined IO points.

• Friction force enhancements

The user now has the option to represent stiction through a constraint, old

method, or now by force with the addition of a hyperbolic tangent function

to smooth the transition between static and dynamic friction.

• N-force element

Allows for a user to define a flexible body when the data is not available.

The user can represent the body through linear stiffness and/or damping

force between multiple points defined by the user. This is a particularly

effective method for defining aeroloads when the loads have been

generated by an outside program.

1.3 LMS Virtual.Lab Acoustics

1.3.1 Vibro-Acoustic Structural Solver

With the new Vibro-Acoustic Structural Solver product, LMS Virtual.Lab Rev 11

offers three new Analysis Cases:

• Structural Modes Case

o Here the eigenvalue problem of the structural finite element model is

solved. The mass and stiffness matrices are build based on a SAMCEF

element library. The displacement modes can afterwards be used in all

vibro-acoustic scenarios based on the modal approach. This case is

available in FEM and BEM Harmonic and Noise and Vibration

workbenches

• Direct Structural Response Case

o The SYSNOISE solver is used to solve the forced response equation of

the structural finite element model in physical coordinates. The model’s

mass, stiffness and daming matrices are build based on the SAMCEF

element library. The Direct Structural Response Case results can be

used for weakly coupled vibro-acoustic cases as panel vibration

boundary condition. Compared to the modal approach, the direct

structural response will handle (especially local) damping more

correctly and can take into account frequency dependent material



properties (damping but also stiffness). This case is available in FEM

and BEM Harmonic and Noise and Vibration workbenches. Supported

loads are pressures (vectors), forces and displacements (functions)

• Direct Vibro-Acoustic Response Case

o The SYSNOISE solver is used to solve the coupled forced response

equation of the structural finite element model in physical coordinates

for both structure and fluid. The structural model’s mass, stiffness and

daming matrices are build based on the SAMCEF element library. The

acoustic mass, stiffness and damping matrices are based on

SYSNOISE fluid element library. This coupled direct vibro-acoustic

case is suited for solving especially lightweight structures that

experience strong coupling with the fluid. Compared to the modal

approach, the direct structural response will handle damping more

correctly and can take into account frequency dependent material

properties (damping but also stiffness). This case is available in the

FEM Harmonic workbench. Supported loads are pressures (vectors),

forces and displacements (functions)

1.3.2 Coupled Noise Transfer Functions

LMS Virtual.Lab now allows you to compute Noise Transfer Functions on

modal based coupled vibro-acoustic systems in FEM and BEM.

1.3.3 Coupled Modes

Dynamic behavior of structures immersed in water (ship hull) or filled with

heavy fluid (tank) change due to the loading effect of the fluid. It can be

interesting to see how the structural modes change both in terms of resonant

frequency and mode shape when this effect is taken into account,.

LMS Virtual.Lab Rev 11 allows to compute these coupled modes, starting from

the “dry” modes and the properties of the heavy fluid. User can thus better

understand the dynamic response of a structure (added mass and added

stiffness) when immersed or filled with heavy fluid. This functionality is

available in Direct BEM, Indirect BEM and FEM analyses.

1.3.4 Improvement of Panel Transmission loss process

In LMS Virtual.Lab Rev 11, several improvements have been made to make

the panel transmission loss process in FEM faster and easier. Transmission

loss is a good indicator for evaluating the acoustic transparency of a flexible

panel. It is typically computed by imposing an acoustic diffuse field on one side

of the panel and by measuring the transmitted acoustic power on the other

side. Various improvements have been made to allow to set up such model

more easily and to solve the system with Finite Elements for best performance.

First, the user can work in a single document where structural and acoustical

models are made for both incident and transmission rooms. Secondly, the

FEM model do not need to lie parallel to the XY plane as for the old BEM

Baffled approach. The half space can be created along any orientation. Also

the plane waves used to represent the acoustic diffuse field are automatically



created in this half space. Thirdly, the incident and transmitted acoustic power

as well as the Transmission Loss are computed automatically and readily

available on the solution without the need for a field point mesh or a post-

processing script.

Last but not least, this new process can be combined with the new vibro-

acoustic solver capabilities to solve the system using a direct approach

(physical approach instead of modal approach) and thus lead to more accurate

results for complex structures with local damping and frequency-dependent

properties.

1.3.5 Meshing for FEM Acoustics

• Convex Mesher

In LMS Virtual.Lab Rev 9 and 10, FEM AML was introduced. This

technology allows creating small FEM models for acoustic radiation, which

therefore can be solved very fast. The outer boundary surface of such FEM

models used for acoustic radiation, needs to be convex. This is a

prerequisite of the AML property. In order to quickly create such convex

surface, we have included a convex mesher in the Meshing for FEM

Acoustics product. Starting from the structural mesh, or any mesh (the

equivalent BEM mesh for instance) that represents the vibrating body, this

mesher will generate the optimal (resulting in the smallest volume) convex

surface. The user can choose the element size of the convex meshed

surface as well as the scaling, which is needed to create a small distance

between radiating inner FEM surface and convex outer FEM surface. After

the convex mesh has been created, the tetrafiller tool (also in Meshing for

FEM Acoustics) is used to create the FEM elements between the radiating

surface and the convex outer surface.

• Volumize Mesher

In some interior or interior-exterior applications like transformers, mufflers,

.. the internal geometry might be available in (structural) shell elements and

can be rather complex. As FEM Acoustics is often a good or only choice

(Temperature/Flow effects) for interior acoustic problems, a new meshing

tool has been included to facilitate the creation of the FEM Acoustics model

starting from a shell model of the structure including baffles, pipes, coils, K

The volumize mesher will add thickness to the input shell mesh and

duplicate every wall in the model, while appropriately taking care of all

junctions that are present in the model. In the resulting surface mesh, all

void volumes in the model are well defined. Each shell element is also part

of the surface of only one volume. This new volumized surface mesh is

therefore ideal to use as input for the tetrafiller tool to create the volume

meshes.

1.3.6 New parallelization of solvers

Multi-core systems are getting more and more present (from dual-core laptops

to large linux clusers). Taking advantage of these hardware ressources can

lead to very significant performance improvement when solving large vibro-



acoustic problems. Rev 11 features several improvements for optimal

parallelization of the computational effort.

Different types of parallelization are available: multi-threading, frequency level

and matrix level. A new “combined Matrix/frequency level” is also available

where user only needs to specify the total number of processes that can be

launched. Solver will then automatically drive the parallelization operation

(number of frequency processes and number of matrix processes) for optimal

performance.

Specifically for the Fast Multipole BEM solver, the frequency level

parallelization is now available on top of the matrix level.

LMS Virtual.Lab Rev 11 now also supports submission of jobs via job

schedulers (pbs, torque, lsf and loadleveler).

1.3.7 Ray Acoustics extensions

• ATV case

In LMS Virtual.Lab Rev 11, ATVs (Acoustic Transfer Vector) can also be

computed in the Ray Acoustics workbench. ATVs represent the transfer

relations between vibrating panels and microphones pressure responses

and are a system characteristic. They can be used whenever the response

needs to be computed for a multitude of vibrating panel load cases or

whenever you are interested in contributions from different panel groups. In

the Ray Acoustics workbench, the ATVs are computed using a Ray

Tracing technology, which allows to easily compute up to high frequencies

with good accuracy and speed. The ATV and ATV reponse cases can

therefore be used for instance to compute cabin acoustics (aircrafts, trains,

cars) at high frequencies with panel vibrations as a boundary condition.

The panel vibrations can be for instance measured displacements on a

discretized membrane of a loudspeaker or a full door. Another example

can be high frequency vibrations of windows due to broad spectrum

turbulent boundary layer loads.

• Source model

From now on coherent point sources can be defined as a frequency

dependent complex sources. In previous release, only the amplitude of the

frequency dependent signal was taken into account. Rev 11 takes also the

phase of the source into account. For audio design applications, this

means the effect of a (e.g. DSP) signal filter that is applied before the audio

signal reaches a loudspeaker, can be incorporated by modelling the source

as a complex one.

A background noise source has been added. In contrast with the

incoherent point source which has a location dependent amplitude, the

background noise source has the same frequency dependent or

independent level for all locations. This source is added to the computed

pressure results of coherent sources. It is also accounted for in the

computation of STI (Speech Transmission Index).



• Reflection model

The absorbent panel property could already be defined as a frequency

(in)dependent angle dependent reflection model based on impedance or

admittance. From these the reflection and absorption can be derived as a

function of angle (and frequency). From LMS Virtual.Lab Rev 11 onwards,

you can also directly specify a frequency (in)dependent absorption or

reflection coefficient which will be used for all rays independent of their

angle of incidence.

In the absorbent panel poroperty, you can also choose to reflect have a

part of the incoming ray reflected in a diffuse manner. The remaining part

will be reflected specularly as before. The diffuse relfection sends reflected

rays from the panel in all directions (on one side of the panel) and allows to

use a more accurate representation for reflection from non ideally flat

surfaces.

• Air Absorption

The absorption effect of air (dB/distance travelled) cant be taken into

account by using the new Air Property in Rev 11. Based on the ambient

pressure, temperature and the humidity provided by the user, this property

adds the correct frequency dependent attenuation for all rays in the model.

The absorption coefficients are derived from a Harris model.

• HRTF library

In LMS Virtual.Lab Rev 11, the Head Related Transfer Function library,

used to create Binaural Impulse Response Functions, includes more

samples. These BIRs are used for aurilisation in order to hear the sound

played by a set of loudspeakers as a listener would perceive it. The effect

of the environment (car cabin for instance) is added by convolving the

original sound with the BIRs. The increased amount of samples in the

HRTF, increases the quality of the BIRs and therefore also quality and

reaslism of perceived sound after convolution.

1.3.8 Coupling of non compatible meshes

It can be sometimes useful to couple several acoustic cavities which are

physically connected (directly or indirectly by a heat exchanger or filter for

example). These cavities might have different node distributions at the

interface and it is therefore required to use specific techniques to coupled

these cavities. Rev 11 features new techniques in Finite Elements Acoustics to

couple non-compatible acoustic meshes either directly (acoustic continuity) or

with a specific relation (transfer admittance matrix).

When solving a direct vibro-acoustic case, it is also needed to couple the

structure with the acoustic cavity and this interface might be non-compatible. In

Rev 11, it is possible to couple these 2 meshes even if they are not

compatible.



1.3.9 New Aeroacoustic Dipoles

LMS Virtual.Lab Rev 11 supports a new type of aeroacoustic dipole sources

allowing to solve the problems more efficiently and more accurately. These

dipoles are still based on the aeroacoustic analogy which allows to first define

the sources from compressible or incompressible CFD data and then to

propagate these sources and compute the radiated acoustic field including

scattering effects. The novelty of this approach consists in the transformation

of dipole amplitude into equivalent acoustic velocity boundary conditions. Once

these velocity boundary conditions are found, the problem can then be solved

using any solving technique like Indirect BEM or FEM.

So, as opposed to previous versions of LMS Virtual.Lab, where distributed

dipole sources could only be defined in Direct BEM analysis, the new dipoles

can now be used in Indirect BEM and FEM analysis leading to much better

performance.

Also for non-compact source surfaces, these new dipoles lead to improved

accuracy by better capturing the scattering effects.

1.3.10 ATILA coupling

In LMS Virtual.Lab Rev 11, the coupled electro-vibro-acoustical simulation of

piezo transducers is made possible with a combination of LMS Virtual.Lab

Acoustics and ATILA (Analysis of Transducers by Integration of Laplace

equatiuons). The goal is to quantify the performance of transducers used in

underwater applications, typically SONAR applications, where one is

interested in predicting the TVR (transmitted voltage response) or directivity

or a single transducer or a complete SONAR array. ATILA is used to provide

electro-mechanical modes and modal forces corresponding to unit Volt loads

for instance. These are picked up by LMS Virtual.Lab and used in a vibro-

acoustic simulation to compute the TVR and directivity.

1.3.11 JMAG coupling

Radiated noise from electric motors is mainly caused by vibrations of the

stator and stator housing. These vibrations can be mechanically induced, as

a result of forces caused by imperfect balancing of the shaft and rotor or by

bearing defects, but a substantial part of the vibrations is caused by forces

which are electromagnetically induced. The JMAG software package (from

the JSOL company) provides an electromagnetic simulation code to predict

such EM forces acting on the stator. In LMS Virtual.Lab Rev 11, such forces

from a JMAG simulation can be imported. All necessary tools are available to

convert the loads from time to frequency domain and map them from the EM

mesh to the structural mesh. Afterwards the forces can be applied on the

stator mesh to compute the vibration response of electric motor. The latter

result is used as boundary condition for computing acoustic radiation (FEM

or BEM Acoustics).

1.3.12 Modeling of Shear layers

LMS Virtual.Lab already featured a number of functionalities allowing to

simulate acoustic performance of aeroengine inlets: duct modes to represent



the fan excitation, Flow solver to capture convection effects, Myers

impedance to capture the absorption effects from the wall liner in the

presence of flow. LMS Virtual.Lab Rev 11 now also allows to model the

acoustic refraction happening when acoustic waves cross a shear layer. This

effect is particularly important when simulating the acoustic radiation from the

aeroengine exhaust.

A new property is available in LMS Virtual.Lab Rev 11 to model the shear

layer. The shear layer is assumed to be infinitely thin and well identified. On

this layer, continuity of pressure and normal displacement is automativally

imposed by the solver, allowing to capure the refraction effects.

1.3.13 User DLL for the crosspower set

Random crosspower load functions can be retrieved with a user-defined

routine, to have full control over the spatial correlation of the loading, e.g.

using a Corcos model. This process is made faster by taking advantage of

the hermitian character of the matrix. Using an extended new interface, the

process can even further be sped up by reading blocks of functions at once

(rather than one-by-one). Note: The previous interface will still work.

1.4 LMS Virtual.Lab Noise & Vibration and Correlation

1.4.1 Kinematic Connections for System Level NVH

For System Level NVH scenarios the assembly modes / FRFs are computed

based on component modes / FRFs and the type of the connections. Up till

now the connections could be either flexible (stiffness and damping) or rigid. In

LMS Virtual.Lab Rev 11, a new type of connection property has been included.

The General MPC Connection Property allows to create a kinematic relation

between up to 6 DOFs of one master node which will define the vibration or

rotation of 1 DOF of a slave node. This type of connection is ideal to represent

connections like a CV (constant velocity) kinematic joint, screw or rack-pinion

connection, or gear ratios between two axles.

1.4.2 Rigid Coupling to Ground

The modification prediction product now also allows a rigid connection to the

ground. The user can choose which DOFs to fix in global or local axis systems.

The FRFs or modes of the modified model are computed afterwards based on

the FRFs or modes of the original component. If the components are used in

assembly context, this feature allows to connect the assembly to the ground.

1.4.3 Inverse Load Identification with missing DOFs

Inverse Load Identification (deterministic version) now supports better

response functions which are expressed in local axis systems. The case now

includes the option to interpret the response functions in local axis systems

and to detect and skip missing DOFs.



1.4.4 Vector Loads for Modal Based Forced Response

The modal based forced response case now also support load vector set

loads. Both force load vectors as pressure load vector are supported. The

support for force load vectors has been included to be able to apply forces

coming from a JMAG EM simulation.

1.5 LMS Virtual.Lab Durability

1.5.1 General

• Multiple calculations in one analysis

In LMS Virtual.Lab Rev 11 for one position in the mesh several analysis

runs using different material properties and/or fatigue algorithms can be

performed in one analysis run. Element Sets used for the definition of the

analysis tasks do not need to be disjoint anymore. In the post processing

the envelope (i.e. max damage) may be displayed as well as the results of

the individual tasks.

• Easy set-up for parallel computation

Parallel computation can now by setup directily in the solver option tab. Up

to for parallel threads on one analysis are included in the standard solver

license.

1.5.2 Seam Welds

• General

Starting Rev 8B a more general way of defining seam welds in a model

was introduced. This allowed arbitrary types of seam welds and a broad

spectrum of properties of individual spot welds. It also allows using all

types of seam weld analysis approaches (nominal stress based or notch

stress based) With Rev 11 a more flexible seam weld detection algorithm

was added. This type is now the standard type of seam weld definition.

Therefore, the menu and toolbar have been adapted.

• Seam Weld Detection

A new seam weld detection tool was added that broadens the applicability

of the tool drastically. More complex local configurations as cross welds

and K-welds are supported. Different connection types between the same

sheets can now be detected. Individual seam weld types can be put in

different sets, which facilitates the use of nominal stress based

approaches.

• Seam Weld Definition file (extended Master Connection File)

The extended Master Connection File format can now also be exported

containing all parameters added in LMS Virtual.Lab. These definitions can

be used on variants of the component allowing a persistent and robust

seam weld definition.



• More accurate results for thin sheets

The notch stress method uses for thin sheets very sharp notches. Newer

research has shown that it is necessary to take size effects into account.

The new effective stress approach implanted in LMS Virtual.Lab is able to

use Neuber’s structural length approach automatically. This leads to better

results especially for the thin sheets.

• Automatic scaling approach

The methodology of the effective notch stress correction method also

allows an automatic scaling of models to any sheet thickness. The

standard approach always used a conservative approach. The new method

allows more realistic results on one hand, but also the application to very

thick sheets.

1.5.3 Combined Events Case

• Persistent Results

The results of combined events cases are stored in files now as the results

of individual fatigue analysis cases. This avoids the recalculation of the

results after reloading an existing document

• Run as independent analysis case.

The combined events case can be configured as an independent analysis

case now. In this case only one analysis run is started instead of the run of

all events individually. Especially for large cases that are run on external

computers this option reduces file and process handling overhead. For

newly created combined events cases this option is the default option.

• Include ordering effects

If the combined events case is configured as an independent analysis case

it can optionally also take into account the ordering of the events.

• New post processing options

The individual results of the events can now be analyzed in the results of

the combined events case directly. Also the damage taking into account

the repetition factors as well as the accumulated damage taking into

account the damage of the repeated events before can be displayed and

analyzed.

1.5.4 New mean stress Influence method

The influence of mean stresses can now be introduced by providing SN-

curves for different mean stresses. In this case the mean stress influence

is interpolated from the given SN-curves. This allows a more flexible

definition of the mean stress influence than the formula based approaches.



1.5.5 New mean stress Influence method

The influence of mean stresses can now be introduced by providing SN-

curves for different mean stresses. In this case the mean stress influence

is interpolated from the given SN-curves. This allows a more flexible

definition of the mean stress influence than the formula based approaches.

1.5.6 Composite Fatigue - Extension of the external material definition

The definition of the SN-curves/material parameters and fatigue

parameters can use definition for each element individually. In this case the

data is provided either by a file or by an external tool. The file interface can

easily be used to define localized fatigue data achieved from

manufacturing simulation.

The tool e-Xstream DIGIMAT® provides data for short fiber composites

using this interface.

1.6 LMS Virtual.Lab Structures

1.6.1 General

• Node on geometry

When nodes are defined on geometry points, the node definition keeps the

link to the definition point.

• Automation extensions

The following functionality is now available for automation

o Agraphe, Clip, Bouterolle connection

o Time history output request (Radioss analysis case)

o Monitored volume and airbag definition (Radioss)

o Feature browser

o Section definition (Radioss)

o Tie contact (Radioss)

o Multi-solver composite property

o Type 1 and type 2 responses for frequency displacement (SOL200)

o New concentrated mass

o Radioss material law LAW38



• Mass overview extensions

It is now possible to automatically add all visible mesh parts as application

region for mass overview. Also, the option ‘portion of mesh’ calculation is

extended to include rigid body and non-structural mass handling.

• Performance improvements

A specific focus was on the performance improvements of the following

functionality

o XML based model checker

o Update of the connections

o Update of the section definitions

o Time step treatment

o Penetration and intersection checking

1.6.2 Fine durability spot weld

• Enhancements of algorithm

The fine spot weld functionality is enhanced by automatic rotation of the

spot weld rings to align better to the surrounding mesh, by automatic

detection of the most appropriate re-meshing area and by re-development

of the transition meshing algorithm.

• Freeze (ANSA) mesh part during fine durability spot operator

If fine spot operation is applied on ANSA mesh parts, the mesh parts are

‘frozen’ automatically after the fine spot operator.

• Enable repositioning of spot based on geometry point

Possibility to correct spot weld location issues by interactively repositioning

the spot weld location, even if based on geometry point.

1.6.3 Nastran pre/post

• Extensions in vibro-acoustics pre/post

The Nastran vibro-acoustics cases support now also the PFMODE,

PFPANEL and PFGRID cards for Nastran versions 2008 and higher. This

means that also grid contribution is supported now in pre- and post-

processing. For Nastran versions lower than 2008, FLSPOUT card is used

for modal and panel contribution (no grid contribution).

• Align pre/post processing of Nastran vibro-acoustic FRF and Forced

Response cases



The possibilities of the Nastran vibro-acoustic FRF case has been aligned

to the possibilities of the Nastran forced response case.

• Support of new Nastran versions

The Nastran DMAPs used by LMS Virtual.Lab were upgraded to support

Nastran 2012.

1.6.4 Nastran SOL200 pre/post

• Support for CONM2 and TOMVAR

The Nastran SOL200 functionality now supports pre and post-processing

for CONM2 (contrated mass) design variables as wel as pre-processing for

the TOMVAR topometry design variable.

• Improvements to design variable definition and visualization

Improvements to design variable defition include the possibility to

conveniently define large amount of design variables, e.g. based on group

selection or visible mesh parts. Design variables selected in the feature

tree are highlighted on the model. Splitting of design variables is improved.

During attachement of the optiomization results, the converge information

is listed in the log report.

1.6.5 Abaqus pre/post

• Support of new Abaqus versions

Support of Abaqus 6.11

• Support of Abaqus spot weld fasteners

Support of spot weld connections import from Abaqus .inp file and spot

weld detection for Abaqus fastener spot welds for meshes imported in LMS

Virtual.Lab

• Support of non-flat structure

Support of non-flat organization of Abaqus file with non-unique numbering.

1.6.6 Radioss pre/post

• Support of new elements and material

The following new elements have been added:

o Support of Radioss multi-solver 2D composite (/PROP/SH_COMP) and

sandwich property (/PROP/SH_SANDW)

o Support of Radioss kinematic joint with spring and damper for blocked

degrees-of-freedom (/PROP/KJOINT)



o Support of Radioss pre-tensioner spring for seatbelt pre-tensioner

modelling (/PROP/SPR_PRE)

o Support of Radioss material law LAW38

• Additional modelling option for screw connections

A new modelization of screw has been added. Relevant for screw with 3

supports, modelling by 2 rigid spiders and 1 spring.

• XML model checker extension

The XML based model checker can now also check for cascade rigid

bodies and rigid connections.

• Mass update extensions

This functionality has been enhanced so the user can now specify the

mass distribution region as a subset of the mass computation region.

1.6.7 Assembly

• Quality audit visualization feedback & sorting

Various usability extensions have been added:

o Sorting of the assembly quality audit results with default sorting from

worst to best, depending on the quality createria.

o New quality audit check criteria to detect/list all connections without

modelization (connection property)

o Possibility to correct spot weld location issues by interactively

repositioning the spot weld location, even if based on geometry point

o Visual feedback on model for the assembly quality audit results.

Different visualization according to assembly quality criteria.

• Extensions to support model cut and model cleanup

Extension to model clean-up functionality to delete empty mesh parts and

groups and related features. Functionality to clean-up connections by

deleting weld points and connections that are empty or unused. These

functions help to streamline the process of cutting models (e.g. from full

body model to body model for front impact or side impact)

• Replace component log report

Component log report lists after replacing one component by another which

features are impacted, along with the list of features that fail to update (e.g.

support cannot be found in the new component)



1.7 FE Interfaces

This version contains bug fixes for LMS Virtual.Lab FE Interfaces and some

upgrades:

• Support of new Abaqus versions

Support of Abaqus 6.11

• Support of new ANSYS versions

Support of ANSYS 14

• Support of ANSYS SECDATA

ANSYS SECDATA support for ANSYS .cdb file interface has been added

for SHELL181, SOLID185, SOLID186, BEAM44, and BEAM188

• Support of new Nastran versions

The Nastran DMAPs used by LMS Virtual.Lab were upgraded to support

Nastran 2012.

1.8 LMS Virtual.Lab Batch Meshing

The following new functionality is available:

• Mesh correction for meshing incl. fine spot

The mesh correction functionality piloting ANSA interactively from LMS

Virtual.Lab has been extended to support ANSA mesh parts with LMS

Virtual.Lab fine durability spot weld patterns. The nodes of the spot weld rings

are automatically labelled (named grids) so they can be fixed during automatic

mesh correction operations in ANSA. The result of the interactive mesh

correction is automatically imported in LMS Virtual.Lab when the user closes

ANSA. This functionality is very usefull for remeshing the transition region is

quality was not yet sufficient.

• Extension of QC parameter for LS-DYNA crash time step

Support of crash time step quality parameter to enable higher quality mesher

for crash. The resulting quality can be visualized on the mesh in LMS

Virtual.Lab and the mesh quality report is also updated to include the results of

this quality parameter.

• Support of V13.2 tube parameter

Support of a new parameter for solid meshing.

1.9 LMS Virtual.Lab Optimization

This version contains bug fixes for LMS Virtual.Lab Optimization.

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