executive_control set dynamics_parameters dynamic_solver
The EXECUTIVE_CONTROL SET DYNAMICS_PARAMETERS DYNAMIC_SOLVER command defines the two fundamental components of the mathematical methods for a dynamic solution: the form of the equations and the integration algorithm.
Description:
Parameter | Value Type | Description |
|---|
model_name | An existing model | Specifies the model to be modified. You use this parameter to identify the existing model to be affected with this command. |
ordinary_differential_equations | Ode-type | Causes Adams to reduce the equations governing the dynamics of the problem to a system of ordinary differential equations. The value assigned to the argument specifies the algorithm for doing the reduction. For the 7.0 release, COORDINATE_PARTITIONING is the only option available. |
ode_integrator | ODE_INTEGRATOR | Specifies the numerical method for integrating the ODEs. For the 7.0 release, the value, Adams, is the only option available. |
differential_and_algebraic_equations | STANDARD_INDEX_THREE/LAGRANGIAN_CONSTRAINED/ STABILIZED_INDEX_TWO/ PENALTY | Causes Adams to integrate the full set of Euler-Lagrange differential and algebraic equations. The value assigned to this argument indicates the form of the equations. |
dae_integrator | BDF/BDF_FIXED | Specifies the numerical method for integrating the DAEs. For the 7.0 release, the value, BDF, is the only option available. |
Extended Definition:
1. You may identify a model by typing its name or by picking it from the screen.
If the model is not visible on the screen, you must type the name. You may also find it convenient to type the name even if the model is displayed.
You must separate multiple model names by commas.
If the model is visible in one of your views, you may identify it by picking on any of the graphics associated with it.
You need not separate multiple model picks by commas.
2. For the 7.0 release, STANDARD_INDEX_THREE is the only option. The full system of 2n + m + p differential equations consists of the following:
n Euler-Lagrange differential equations (one for each generalized coordinate);
m constraint equations;
n equations of the form x - u = 0 (one for each generalized coordinate) to reduce the differential equations to first order; and
p state equations, first-order differential equations, or other algebraic equations that may have been added to the problem.