There are four control components available to schedule a GSP output parameter or component property. During simulation with an active scheduler control component, GSP is adapting a user assigned free state variable (such as fuel flow) iteratively until the schedule parameter is at the specified value. The latter means an active schedule control component adds an error equation.

•Equation Scheduler for scheduling GSP output parameters or component property using an equation,

•1-D Lookup Table Scheduler for scheduling a GSP output parameter using a 1-D table,

•2-D Map Scheduler for scheduling GSP output parameter or component property using a 2-D map (specified in a map).

•Generic Schedule Controller, which combines the functionality of all 3 above components enabling the modeler to create an equation using an expression including parameters representing table lookup and/or map lookup output. Note that this component is recommended for advanced users only.

The parameter to control can be selected in the Scheduled parameter group box as:

•Output parameter (this option always requires to specify a state elsewhere)

Scheduling output parameters is the straight forward way to schedule the engine model operating point. Select Output parameter (parameters specified as Output in component output tab sheets and Global output parameters) using the combo box.

•Component property (requires state depending on "Property is State" option)
Scheduling GSP properties is for advanced usage and requires understanding of the GSP modeling internal details. GSP properties represent internal model parameters. The leftmost (active) combo box must be used to select the component from which to select the property, the right 2 combo boxes define what kind of property must be controlled:

oOD Select component Off-Design property

oDP Select component Design property corresponding to Off-Design property. If scheduling is also required for Design point calculation, then either the Property is state option or the Determinate relation (no equation).

•The Property is state option is to avoid the need for an additional free state to match the number of states and errors. In this case the property itself will be the free state and then the solver will simply adjust this state variable (i.e. the property) to match the specified value. As such, the schedule equation added can be considered a 'dummy' equation simply saying the property (and corresponding state) must equal a given value.

•The Determinate relation (no equation) is for Property control only option and inhibits the adding of an error equation and state. This means during simulation the property is simple set by GSP and any effects from the changing property value only works on components calculated later that the Schedule control components itself. Although this option may well increase iteration speed and stability (reducing the number of equations), care must be taken with the calculation order of the components, since the property value will not affect components with higher calculation order numbers.

If the Project options | Advanced | Show advanced model equation controls options in components option is checked two additional options are visible in the General tab sheet:

•The checkbox Always create error equation defines whether during Design point calculation even if not active (Active checkbox) an equation is added to the equation system.

•With the Corresponding state nr. for deactivation number the state with that number will be deactivated. Run the States and Error report to show current model states and errors (option can be found in the model data menu item of the models main menu).