Define the solver (Linux version)

1. Select the Solvers panel.
2. For Command type in echo N o r m a l. This signals LS-OPT a normal termination of the solver.
3. For Name of Analysis Case enter SOLVER_1.
4. Push the Add button.

Define the solver (Windows version)

1. A direct call of the command echo N o r m a l doesn't work for the Windows version. We have to save the command line type N o r m a l in a .bat file and take it as the solver. NOTE: It's necessary to give the complete path of the solver command.

The created command file may look like this:

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Command file "com.2bar.robust.start"
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ Generated using LS-OPT Version 4.1
$
"Two-bar Truss"
$
$ Created on Wed Dec 15 10:20:36 2010
solvers 1
responses 2
$
$ NO HISTORIES ARE DEFINED
$
$
$ PROBABILISTIC DISTRIBUTIONS
$
distribution 2
 distribution 'area_dist' NORMAL  0  0.1  
 distribution 'base_dist' UNIFORM  0  0.2  
$
$ DESIGN VARIABLES
$
variables 2
 Variable 'Area' 2.
  Lower bound variable 'Area' .2
  Upper bound variable 'Area' 4.
  Range 'Area' 4.
  variable 'Area' distribution 'area_dist'
 Variable 'Base' .8
  Lower bound variable 'Base' .1
  Upper bound variable 'Base' 1.6
  Range 'Base' 1.6
  variable 'Base' distribution 'base_dist'

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$      SOLVER "SOLVER_1"
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$ DEFINITION OF SOLVER "SOLVER_1"
$
 solver own 'SOLVER_1'
  solver command "echo N o r m a l"
$ ------ Pre-processor --------
$   NO PREPROCESSOR SPECIFIED
$ ------ Post-processor --------
$   NO POSTPROCESSOR SPECIFIED
$ ------ Metamodeling ---------
  solver order quadratic
  solver experiment design dopt
$ ------ Job information ------
  solver concurrent jobs 1
$
$ WARNING - NO RESPONSES DEFINED FOR SOLVER "SOLVER_1"
$
$
$ RESPONSE EXPRESSIONS FOR SOLVER "SOLVER_1"
$
 response 'Weight' expression { Area * sqrt(1+Base*Base) }
 response 'Stress' expression { 0.124 * sqrt(1+Base*Base) * (8/Area + 1./Area/Base) }

$
$ OBJECTIVE FUNCTIONS
$
 objectives 1
 objective 'Weight' 1
$
$ CONSTRAINT DEFINITIONS
$
 constraints 1
 constraint 'Stress'
  upper bound constraint 'Stress' 1
  probability upper bound constraint 'Stress' 0.05
$
$ PARAMETERS FOR METAMODEL OPTIMIZATION
$
 Metamodel Optimization Strategy DOMAINREDUCTION
$
  iterate param design 0.01
  iterate param objective 0.01
  iterate param stoppingtype and
$
$ OPTIMIZATION ALGORITHM
$
 Optimization Algorithm hybrid simulated annealing
$
$ JOB INFO
$
 iterate 10
STOP