| Citation: | YU Xin, CHEN Renliang. Effect of tiltrotor nacelle tilting strategy on the pilot workload[J]. Journal of Aerospace Power, 2023, 38（8）：1889-1900 doi: 10.13224/j.cnki.jasp.20220214
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The pilot workload and vehicle’s motion in the conversion maneuver of the tiltrotor XV-15 from helicopter mode to aircraft mode were analyzed. To obtain the pilot workload and the vehicle’s motion during conversion maneuver, an investigation method of conversion maneuver was proposed, which considered the realistic conversion maneuver factors comprehensively. The conversion maneuver was formulated as a proper nonlinear optimal control problem. The cost function consisted of several factors including transitional time, pilot workload, the power required, control allocation, and flight attitude. The constraints included not only the trajectory constraints and control limits of the developed augmented dynamics, but also safety conditions of the conversion corridor and flight height. The workload in the solution of conversion maneuver was evaluated by wavelet analysis, and the effect of different naclle tilting strategies on the workload and aircraft motion was discussed. Based on the results, for the conversion maneuver, it was recommended that, to alleviate the pilot workload and the variation of attitude, the nacelle should tilt much slower in the beginning before reaching a certain forward speed at which the nacelle can tilt at a normal rate. As a result, the presented optimization method could identify the pros and cons between different nacelle tilting strategies successfully.
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