Simulation Settings

This dialog contains the following tabs:

Static Tab

Below are descriptions of the options in the Static tab of the Simulation Settings dialog.

Option	Description
Method	Select the type of Static solver method from the drop down:
	Force Imbalance - Type S	Uses the Force Imbalance Method to calculate static equilibrium.
	Force Imbalance - Type D	Force Imbalance Method that uses a time integration approach for quasi-static simulation. Not applicable for Static simulation (MotionSolve defaults to Force Imbalance – Type S) for pure static simulation. While using this method, the solver also uses the Transient simulation settings.
	MKEAM	Uses the Maximum Kinetic Energy Attrition Method based on conservation of energy. This method is suitable for models with contacts. This method does not work for quasi-static simulation.
	The following options are available if Force Imbalance - Type D/Type S is chosen:
	Maximum residual	This specifies the upper limit for the change in residual of the system equations at the static equilibrium point.
	Maximum imbalance	Specifies the maximum force imbalance in the equations of motion that is allowed at the solution point.
	Maximum number of iterations	Specifies the maximum number of iterations that are allowed before simulation stops.
	Stability	Specifies the fraction of the mass matrix that is to be added to the Jacobian to ensure that it is not singular.
	The following options are available if MKEAM is chosen:
	Maximum number of iterations	Specifies the maximum number of iterations that are allowed before simulation stops.
	Maximum residual kinetic energy tolerance	Specifies the maximum allowable residual kinetic energy of the system at the static equilibrium point.
	Maximum coordinate difference tolerance	This specifies the upper limit for the change in system states at the static equilibrium point.

Transient Tab

Below are descriptions of the options in the Transient tab of the Simulation Settings dialog.

Option	Description
Integrator type	Select the type integrator from the drop down: ABAM VSTIFF MSTIFF DSTIFF
	The following common options are available for all integrators:
	Integrator tolerance	Represents the maximum absolute error per step that the integrator is allowed in computing the displacement, velocity, and differential equations states.
	Maximum step size	Defines the maximum step size the integrator is allowed to take.
	Maximum initial step size	The maximum initial step size.
	Minimum step size	Defines the minimum step size the integrator is allowed to take.
	Maximum order	Specifies the maximum order that the integrator is to take.
	Velocity tolerance fact	The factor that multiplies integr_tol to yield the error tolerance for velocity states.
	Implicit diff tolerance	Defines the accuracy to which implicit differential equations, such as Control_Diff equations with the is_implicit = "TRUE", are to be satisfied.
	The following options are specific to DSTIFF:
	DAE index	The index of the DAE formulation. Options available are: 3 or 1.
	DAE corrector max iteration	The maximum number of iterations that the corrector is allowed to take to achieve convergence.
	DAE corrector min iteration	The minimum number of iterations that the corrector is allowed to take before it checks for corrector divergence.
	DAE constraint tolerance	The tolerance on all algebraic constraint equations that the corrector must satisfy at convergence.
	Jacobian matrix evaluation	This attribute controls the Jacobian matrix evaluation during corrector iterations.
	Velocity control	The logical flag that controls whether the velocity states are checked for local integration error at each step. This option is only available in the case where the DAE index = 1.
	The following options are specific to VSTIFF/MSTIFF/ABAM:
	Constraint tolerance	Defines the accuracy to which the system configuration and motion constraints are to be satisfied at each step.

Linear Tab

Below are descriptions of the options in the Linear tab of the Simulation Settings dialog.

Option	Description
Eigen values and vectors (.eig, .h3d)	Specifies whether the eigenvalue and eigenvector data is written to a .eig file.
Disable damping	Specifies whether the linearization solver should disable damping from all force elements for the eigenvalue solution.
Kinetic energy distribution	Specifies whether the modal kinetic energy distribution is written out to the solver log file and the *_linz.mrf output file.
Generate State Space Matrix	Altair Compose/Activate OML Specifies whether the A, B, C and D matrices are to be written out into a .oml file that can be read in by Compose/Activate. MATLAB Specifies whether the A, B, C and D matrices are to be written out into a file that can be read in by MATLAB. Simulink Specifies whether the A, B, C and D matrices are to be written out in Simulink MDL format or not.

General Tab

Below are descriptions of the options in the General tab of the Simulation Settings dialog.

Option	Description
Number of CPU cores in multiprocessor (SMP) run	Specifies the number of CPU cores to be used when multiple cores are available. This is particularly helpful in parallelizing computations in the case of Contact simulation.
Mesh coarseness of CADGraphics for contacts	Default coarseness setting for meshing CADGraphics when in contact. MotionView will use this setting while generating a mesh during solver export for those CADGraphics on which mesh coarseness has not been individually set.
Active contact iteration	With this option selected, the contact force will be considered for residual evaluation during corrector iteration of the solver. While this option is useful to improve the simulation’s robustness in case of high oscillations, it can lead to a decrease in performance for other cases.
Default location for solver run files	The default location for solving. When not specified, the solver deck is written at the model location.