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Guest groundpounder75

AP parameters in aircraft.cfg

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There are a lot of new AP parameters in the 2004 aircraft.cfg, due to the lack of SDK still undocumented.Has anyone figured out what they do ?E.g. NAV integrator/derivative control and boundary. LOC with a bit of crosswind always goes bananas at a certain point, so an Autoland with crosswind puts all Jets with MS AP in the grass. Has anyone tried to influence this with the above parameters and succeeded ?Just thought I ask before I start a lot of try and error.Mike

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Mike,>E.g. NAV integrator/derivative control and boundary. Integrator and derivative control, amongst others, are related to control theory. Integrator and derivative are gains (depending on how you look at it). For example, how well a motor places a needle in a hole is dependent on how well the motor is controlled (and how it is hooked up to the needle). Usually a motion controller controls, or sends output signals to an amplifier. Then the amplifier sends either a voltage or a current to the motor depending on the type of control being used. The output from the amplifier maintains a relationship to the input from the motion controller.Proportional (how fast and stiff the motor moves the needle), derivate (will cause the motor to oscillate before it gets to the hole), integral (effects error signal which is the difference between the command signal and the actual path taken), velocity feedforward (positive gain that works with derivative), and friction feedforward (another positive gain that helps if a system has a lot of friction in it) are all examples of gains. Adjusting one of these effects the way output siganl going to the amplifier. To adjust these is pretty straight forward once you understand what each one does and how they are related. Usually when you tune motors, or adjust the above mentioned gains to maximize the performance of the motor, you will work with a graphical representation of the output to the motor and then some variable from the motor, ususally encoder counts or error signal, to track the motors performance. If the motor is tuned pretty nicely you will see the motor track the output signal of the motion controller. So to answer your question, I haven't played with the NAV integrator/derivative or similar things yet. I am waiting for the SDK to find out what exactly is going on. That is assuming the SDK will have the correct information in it.

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