> WHAT??? > > Design maneuvering speed is "Va" and is simply and _only_ > Va = Vs * sqrt(g load limit) > > You can be sure that an aircraft manufacturer would have a whole lot of > patents if they had a method to recognize all the situations that can > cause structural overloading and recover before these are reached. > That would be the holy grail of FCS design, and of aerodynamic modelling!
At 450+ knots a sudden full deflection elevator movement might not be so good. (?) Additionally, a back and forth elevator motion at a particular frequency might not be good at all. For one thing I know the F-16 (not a modern commercial transport, but for example) has structural filters on most/all aerosurfaces. This might have to do with the interaction between the hinge moments, the servoactuator, and pilot inputs (etc.) so as to prevent a divergent oscillation that might violate some structural constraints - I can't remember exactly what it does, except that it attenuates control inputs of a particular frequency. I am almost sure that commercial transports limit some pilot actions to stay within structural tolerances. In the case of the flight that crashed into the neighborhood in New York, the particulars of that accident lead me to believe that given the sideslip angle, and the yaw rate at rudder separation, the rudder command might have been processed to eliminate the peak that stressed the rudder too far. I could be wrong, but the thought occurred to me and I think it is plausible. This particular accident did not appear to me to feature an obscure, unpredictable causal manuever. Also, I don't think that all possible permutations of pilot actions that overstress the aircraft need to be accounted for. Given my limited understanding of neural networks (and from the demos I have seen at work) this tactic might be effective in filtering out undesirable pilot inputs as far as structural limit violations go. Jon _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
