• Dynamic load case weighting to obtain a topology relevant for all design load cases
• Forging geometry definition. This geometry definition is similar to a two-sided casting except that a forging thickness is introduced.

New minor features are:

• Castings can have interior holes.
• Pentahedral elements are supported.
• The memory footprint is reduced more than a factor of 2 and an option is provided which can be set to reduce memory use by a further factor of 2.
• *MAT_ELASTIC is supported for the design part.
• Lightly used elements can be kept instead of deleted
• The SIMP algorithm can be switched on and off.
• Coordinate systems are no longer limited to only DIR=X.
• Restarting was improved not to redo all LS-TaSC computations.
• A fringe plot of the material utilization as considered in the design process can be viewed.
• The fraction of the original number of elements used in the design can be viewed as a history.
• The global constraint handling has been changed to consider only active constraints. If no global constraints are active anymore, then the algorithm will slowly return to the user specified mass fraction.

Many thanks are due to David Björkevik for the GUI design and implementation.

Valuable feedback from customers and co-workers is also acknowledged.

Download: http://ftp.lstc.com/user/ls-tasc/v2.1/

Remark: Login is "user", please ask LSTC or your local distributor for the password.

Remark: Login is "user", please ask LSTC or your local distributor for the password.

• Dynamic load case weighting to obtain a topology relevant for all design load cases
• Forging geometry definition. This geometry definition is similar to a two-sided casting except that a forging thickness is introduced.

New minor features are:

• Castings can have interior holes.
• Pentahedral elements are supported.
• The memory footprint is reduced more than a factor of 2 and an option is provided which can be set to reduce memory use by a further factor of 2.
• *MAT_ELASTIC is supported for the design part.
• Lightly used elements can be kept instead of deleted
• The SIMP algorithm can be switched on and off.
• Coordinate systems are no longer limited to only DIR=X.
• Restarting was improved not to redo all LS-TaSC computations.
• A fringe plot of the material utilization as considered in the design process can be viewed.
• The fraction of the original number of elements used in the design can be viewed as a history.
• The global constraint handling has been changed to consider only active constraints. If no global constraints are active anymore, then the algorithm will slowly return to the user specified mass fraction.

Many thanks are due to David Björkevik for the GUI design and implementation.

Valuable feedback from customers and co-workers is also acknowledged.

• Nonlinear explicit problem

A second part of the problem set attempts to simulate the design process for examples that are typical for the LS-DYNA® user. Detours have been introduced to investigate features related to a particular design step in more detail. The examples are

• Crashworthiness optimization of a vehicle
• Mode tracking 
• Multidisciplinary Design Optimization
• Material parameter identification

A further special section is dedicated to understanding different optimization strategies.

The final part of the problem set teaches the user how to assess reliability of a design and investigate the sources of variability on the FE model. The categories are:

• Reliability
• Outlier Analysis

The run times for the examples vary between a few seconds (simple explicit problems) and ~10 min. (3GHz) (Iterative optimization using LS-DYNA for crash optimization). The longest DYNA simulation time is about 15s.

In the GUI, the option menu Subcase sets the case-id field.

For details, see LS-OPT Manual, section History and Response Results.

• LSTCVM avoids security risks associated with rsh/ssh
• The file system can be shared or not (latter requires LS-OPT/wrapper executable for transmission)
• Interfaces to queuing systems available

LSTCVM is available with LS-OPT Version 4.1.

Download ftp://user@ftp.lstc.com/ls-opt/lstcvm/

Remark: Login is "user", please ask LSTC or your local distributor for the password

-------------Download --------------------------------------------------

http://lstc.com/download/ls-opt

Remark: Login is "user", please ask LSTC or your local distributor for the password

Monte Carlo Investigations

• Direct and metamodel based
• Estimation of Mean, Std. Deviation
• Correlation Analysis
• Confidence Intervals
• Outlier Analysis
• Stochastic contribution analysis

Reliability studies

• Determination of failure probability
• Methods: FOSM, FORM

Reliability Based Design Optimization

• Optimization that directly accounts for the variability and the probability of failure

Robust Design Optimization

• Optimizing design and robustness simultanously

Visualization of statistical results on the FE-Model (DYNAstats)

• Fringe of mean and standard deviation on the FE-model utilizing LS-PrePost
• Display of variation of element results such as stress, thinning, plastic strain...
• Correlation of node displacements with respect to any response
• Statistics of time history curves

Examples:

• RBDO
• Robust Parameter Design
• Reliability Analysis

back to Home

It contains the following major new features:

• Dynamic load case weighting. This algorithm obtains a design equally relevant for all design load cases.
• Forging geometry definition. This geometry definition is similar to a two-sided casting except that a forging thickness is introduced.

New minor features are:

• Castings can have interior holes.
• Pentahedral elements are supported.
• The memory footprint is reduced more than a factor of 2 and an option is provided which can be set to reduce memory use by a further factor of 2.
• *MAT_ELASTIC is supported for the design part.
• Lightly used elements can be kept instead of deleted.
• The SIMP algorithm can be switched on and off.
• Coordinate systems are no longer limited to DIR=X.
• Restarting was improved to be faster by using more archived results.
• A fringe plot of the material utilization as considered in the design process can be viewed.
• The fraction of the original number of elements used in the design can be viewed as a history.

-------------Download --------------------------------------------------
http://ftp.lstc.com/user/ls-tasc/v2.1_beta/

Remark: Login is "user", please ask LSTC or your local distributor for the password.

The graphical tool LS-OPTui interfaces with LS-DYNA and provides an environment to specify optimization input, monitor and control parallel simulations and post-process optimization data, as well as viewing multiple designs using LS-PREPOST.

Applications: Design Optimization, Design of Experiments (Sensitivity Analysis), System Identification, Reliability Studies

If you are interested in using LS-OPT, please contact LSTC, DYNAmore, or your local distributor.

This directory contains an example that also can be used as a template
for creating user defined metamodels for LS-OPT

You can  also download the interface to implement user meta models in python, see paper Using LS-OPT for Meta-Model Based Global Sensitivity Analysis.

Download pyUserMetaModel