executive_control set easy_dynamics
The EXECUTIVE_CONTROL SET EASY_DYNAMICS command provides an automatic way to select integration attributes with a single command. In addition, this command provides an easy-to-understand method for controlling the error.
Format:
executive_control set easy_dynamics |
|---|
Model_name = | string |
Significant_digits = | real |
Dynamic_attribute = | stiff/high_frequencies/smooth |
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. |
SIGNIFICANT_DIGITS | real | Defines the tolerance of the integration error in decimal digits of accuracy. The relative, local truncation errors for the integrator will be bounded by 5 * (0.1 ** r), where r is the specified value for the SIGNIFICANT_DIGITS argument. |
dynamic_attribute | STIFF/HIGH_FREQUENCIES/ SMOOTH | Indicates the characteristics of the mechanism to be simulated. |
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. The value of DYNAMIC_ATTRIBUTE can be:
STIFF: Causes Adams to begin integration with the BDF integrator with VARIABLE coefficients.
HIGH_FREQUENCIES: Causes Adams to begin integration with coordinate partitioned equations and the Adams-Bashforth-Moulton integrator. If you specify PERSISTENCE on the SOLUTION_PRIORITY argument, Adams switches integrators after a convergence failure, regardless of the value of DYNAMIC_ATTRIBUTE.