Prediction of pilot workload in helicopter landing after one engine failure  

作　　者：Zhiming YU Xufei YAN Renliang CHEN 

机构地区：[1]National Key Laboratory of Rotorcraft Aeromechanics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Intelligent Robot Research Center,Zhejiang Lab,Hangzhou 310000,China

出　　处：《Chinese Journal of Aeronautics》2020年第12期3112-3124,共13页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.11672128)。

摘　　要：This paper presents a method to predict the pilot workload in helicopter landing after one engine failure.The landing procedure is simulated numerically via applying nonlinear optimal control method in the form of performance index,path constraints and boundary conditions based on an augmented six-degree-of-freedom rigid-body flight dynamics model,solved by collocation and numerical optimization method.UH-60 A helicopter is taken as the sample for the demonstration of landing after one engine failure.The numerical simulation was conducted to find the trajectory of helicopter and the controls from pilot for landing after one engine failure with different performance index considering the factor of pilot workload.The reasonable performance index and corresponding landing trajectory and controls are obtained by making a comparison with those from the flight test data.Furthermore,the pilot workload is evaluated based on wavelet transform analysis of the pilot control activities.The workloads of pilot control activities for collective control,longitudinal and lateral cyclic controls and pedal control during the helicopter landing after one engine failure are examined and compared with those of flight test.The results show that when the performance index considers the factor of pilot workload properly,the characteristics of amplitudes and constituent frequencies of pilot control inputs in the optimal solution are consistent with those of the pilot control inputs in the flight test.Therefore,the proposed method provides a tool of predicting the pilot workload in helicopter landing after one engine failure.

关 键 词：Engine failure Nonlinear optimal control method Pilot control activity Pilot workload Wavelet transform analysis 

分 类 号：V275.1[航空宇航科学与技术—飞行器设计] V249.1