Hi everyone. I want to use my model for performance calculations as well. I know for characterization of stability parameters, constant inertia are valid but for long duration flights how can i impart inertia variation because of fuel in my model. Please also suggest any reading material on the topic.
Regards
For jet aircrafts the change in weight is accounted for in terms of the Thrust Specific Fuel Consumption. What kind of performance calculation do you intend to carry-out? Fundamental performance calculation methods are provided in details in the text books on aircraft performance by John D. Anderson, and Bandu N. Pamadi.
how can i impart inertia variation because of fuel in my model which is solving rigid body EOM.
There are two approaches, one simple, one not: (1) if inertia changes slowly, then you can linearize the aircraft EOM at different weights, just as is done for different aircraft configurations. The parameters, as in simulation programs, then are functions of altitude, airspeed, and weight; (2) if inertia changes rapidly, the aircraft EOM can be re-derived taking partial derivatives, using moments of inertia as variables instead of constants. Good Luck,
DJB
You can work with the fuel as variable. You may tabulate the Inertia Moment for diferente amounts of fuel and interpolate linearly for the presente fuel amout. Add the fuel moment to the aircraft zero fuel moment. For Military aircraft you have to considers also any variation in configuration, as bom release, for instance.
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