Research of horizontal tail icing diagnose technique based on parameter identification
Horizontal tail icing tends to stall,changing the control characters of aircraft,and impac-ting on flight safety.A technique was proposed to diagnose the icing on the tail,and test flight data identification results were used to determine the threshold value of key aerodynamic derivative chan-ges after horizontal tail icing,which avoided the problem of misjudgment of horizontal tail icing end caused by differences between wind tunnel test results and actual flight.Considering the real-time requirements for diagnosing icing on horizontal tail,the recursive least squares method was used to i-dentify the longitudinal aerodynamic derivative and control derivative of the aircraft in real time.By comparing the changes in key aerodynamic derivatives and threshold values,the icing situation at the tailplane is diagnosed,and the method is validated by using simulation data.The results show that this method can accurately determine whether the horizontal tail is icing,and can be applied to the diagnosis of icing on different types of aircraft horizontal tails.
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