-
o
Max and Min altitude (such values were chosen based on maximum cruise level feasible or free flight levels)
o
Altitude steps
o
Max speed, min speed
o
Speed steps
The chosen graphs generation stop conditions were the followings: o
Minim fuel consumption for the same number of waypoints
o
Altitude and speed steps resolution (ex. speed< k1 m/sec; altitude < k2 m)
For what concern the cruise phase we fixed the initial graph with a certain number of points in latitude and longitude and less points in speed and altitude, because the cruise altitude depends on the assigned flight level and the speed depends on the rules of flight in the civil airspace and on the aircraft flight dynamic. It could be necessary to turn the aircraft to avoid the no flight zones, so it is required to have a high resolution in latitude and longitude.
7.2.3 Software implementation The software is implemented in Matlab, and in the following block scheme are represented the step implemented.
Test case selection, table of the grid values (altitude, speed) generation
Grid generation from the table data
Results evaluation
no
Stop? yes Exel file
Fig.32 Block scheme of the software implementation In the first step the Test case is selected, and a table of the grid values (altitude, speed) is generated. Then the graph is generated from the table saved. Later the results (emissions, etc.) are evaluated and the stop criteria are checked. If stop criteria are reached, an exel file contained all the results is saved, if not the process start again with another iteration. In the following table is reported an example of the exel file generated by the program:
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