Dynamic response analysis under atmospheric disturbances for helicopters based on elastic blades

作     者：Tong Liu Yuting Dai Guanxin Hong Linpeng Wang 

作者机构：School of Aeronautic Science and Engineering Beihang University Beijing 100083 China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2017年第30卷第2期

页      面：628-637页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：co-supported by the National Natural Science Foundation of China-China(No.11302011) the Specialized Research Fund for the Doctoral Program of Higher Education-China(No.20131102120051) 

主　　题：Dynamic model Elastic Helicopter Time domain analysis Trimming Wind shear 

摘      要：A flight dynamics model based on elastic blades for helicopters is *** shape analysis is used to describe the rotating elastic blades for the purpose of reducing the elastic degrees of freedom for *** analytical result is employed to predict the rotor forces and *** equilibrium equation of the flight dynamics model is then constructed for the elastic motion for blades and the rigid motion for other *** nonlinear equation is further simplified,and the gradient descent algorithm is adopted to implement the trim *** trim analysis shows that the effect of blade elasticity on the accuracy of rotor forces and moments is apparent at high speed,and the proposed method presents good accuracy for trim *** timedomain response is realized by a combination of the Newmark method and the adaptive RungeKutta *** helicopter control responses of collective pitch show that the response accuracy of the model at a yaw-and-pitch attitude is ***,the influence of blade elasticity on the helicopter dynamic response in low-altitude wind shear is *** increase in blade elasticity reduces the oscillation amplitude of the yaw angle and the vertical speed by more than 70%.Compared with a rigid blade,an elastic blade reduces the vibration frequency of the angular velocity and results in a fast return of the helicopter to its stable flight.