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FDM: Trimming with JSBSim trim routine #1316
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Could you please explain in detail what your issue is? What trimming? What is the procedure you expect to be available? |
I want to reposition the aircraft model in a cruise flight configuration (mid air and wings level), for my research on flight controllers. By trimming I mean to find the necessary inputs (throttle lever setting, aileron deflection, elevator deflection, rudder deflection, flap deflection, trim tab deflection e.t.c.) to have the model in equilibrium (Assuming no control/disturbing inputs, lift = weight; thrust = drag) at a given initial condition (pressure altitude and Indicated Air Speed). The procedure already exists. JSBSim source code contains this algorithm that does what I want. This algorithm works for Bill Galbraith's example aircraft but not for C172p. What I want is a reasonable model (at least conform to real aircraft's eigen motions with small tolerance) for C172p. So that I can develop my Controllers. |
I don't understand well what you are meaning. The c172p can be manually trimmed in the air. I've never seen the JSBSim algorithm trimming the aircraft in the air. I've seen the trimming algorithm working only at simulator start, for initializing the aircraft stopped on the ground. |
Are you trying to do this under the FlightGear program or JSBSim standalone? |
The state solution is something we will eventually implement. There are plans to have startup states such as. |
I am trying to do it under the JSBSIm standalone. I will try the example, and let you guys know. thanks for your quick replies! |
The JSBSim model for c172p does not seem to trim except for on ground.
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