Analysis of Failure Influence of Gust Mitigation System on Elastic Wing
Aiming at the problem of gust response of an elastic wing,the minimum state method was used to ap-proximate the unsteady aerodynamic force to obtain the wing state space equation.The proportional,integral and dif-ferential(PID)control theory was used to mitigate the moment response of the wing root under"1-cos"discrete and continuous gusts,and the influence of four fault modes of rudder surface on the wing was considered,including hitch,float,oscillation and deflection constraint.The results show that under the condition of jamming fault,the maximum increase in additional load is 28.7%;The reduction of flight envelope under floating fault affects system stability;Under oscillating faults,the maximum increase in additional load is 23.7%,which will affect the fatigue life of the wing;Under limited control faults,the maximum increase in additional load is 1.7%,and limited speed may cause system instability.
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