<< Click to Display Table of Contents >> Navigation:  GSP components > Component Libraries > Engine Control Components > Power Control Component Library >  Power Controller

 

The Power Controller control component can be used to specify how the engine is controlled. This components links a parameter like a Power Code or a Rating Code to an engine power setting through a user defined scheduled engine parameter. A developed standard for the designation of gas turbine engine power settings is described by the SAE in Aerospace Standard 681.

 

The General and Design tab sheets specify the off-design and design conditions for the power controller respectively. A Power Mode and the Power code value can be specified for both design and off-design operation. The power modes are defined on the Schedule tab sheet.

 

The Schedule tab sheet allows the specification of the schedules. The Scheduled Parameter dropdown list allows the selection of the parameter that is scheduled (e.g. a rotor speed or EGT parameter). If a map is used, also the X and, in case of a 2-D map, Y input parameters for the map must be selected. In the table, columns are defined for Power code and one or more power/operating modes. Different schedules can be specified for different modes (e.g. a Normal and Emergency power mode).

 

The Power code column must be filled with the desired power code values and the schedules must be constructed on either ascending or descending Power Code value. Rows can be added using the numerical grid navigator directly above the top left of the power code schedule. The buttons with a triangle bitmap can be used to scroll through the rows, the button with an "A" adds a row, the button with a "+" inserts a row before the selection, the button with a "-" deletes the selected row and the button with the "X" clears all the rows. A popup menu appears when the power code schedule is right-clicked from which the following options can be selected:

•Edit Mode Description

A textbox dialog form opens in which the user can define the new title for the selected column.

•Add Mode

A Mode column is added after the last mode column.

•Delete Mode

The selected Mode column is deleted.

The scheduled parameter can also be obtained from a map. In that case the user selects the schedule parameter cell next to the corresponding power code and presses the Browse button to select the map. The X (and Y in case of a 2-D map) input parameters for the map must be selected from the corresponding dropdown lists.

 

The scheduled power parameter value is scaled to the design value of the scheduled parameter. This ensures that an OD calculation following a DP, with a Power code equal to the Design Power, produces an OD point equal to DP.

The scheduled value is obtained by interpolation with power code in the selected Mode column. The values in the cells may be either numeric strings or map names, controlled by the Map control frame at the bottom. Note that the Map input and output itself are not scaled, only the resulting scheduled value is scaled.

 

In the (transient) series tab sheet a series of Power codes as function of time/point values can be specified to be used in transient/steady state series calculations.

The parameters power code and the scheduled value can be added to the GSP data output parameter list by checking the respective checkboxes on the Output tab sheet. Remarks can be entered in the memo field on the Remarks tab sheet.