Research On Electric Regulative Elevator Surface System In Wind Tunnel Test

In recent years,aviation industry has developed rapidly in China.Among them,wind tunnel test plays an important role.The efficiency of wind tunnel tests affects the development of aviation in China.In order to improve the efficiency and quality of wind tunnel tests on scaled aircraft models,electric control surface system is indispensable.This paper studies the electric control surface system installed inside the scaled model of the aircraft in the wind tunnel test from the aspects of structural optimization design,nonlinear interference factor analysis and control methods.In view of the design target,the main focus of the transmission structure of the system is analyzed,that is,to increase the reduction ratio.For this purpose,the feasibility of the drive form,gear transmission,worm gear transmission and ball screw transmission are demonstrated respectively.In terms of the ball screw transmission form,the author further demonstrates different transmission structure forms through the method of mechanism synthesis,and finally determines the basic mechanism of the electric control surface through analysis and discussion.In order to further improve the reduction ratio in limited space inside the scaled model and determine the dimensional relationship of the transmission structure,the author establishes a parametric model of the electric control surface,and determines the design variables,optimization goals and constraint conditions.In order to reduce the number of design variables,the author firstly uses Adams software to analyze the influence of each variable on the optimization goal,then determines certain variables,and finally optimizes other design variables by interior point method.Finally,standard parts such as motors are chose,a three-dimensional model of the electric control surface is established and the mode of the system is analyzed.Since the system is a high-precision positional servosystem,it is necessary to analyze some nonlinear extraneous factors.This paper mainly analyzes the influence of friction,backlash and elastic deformation of parts on the system.The friction model adopts Stribeck friction model.In view of the influence of backlash,the backlash model adopts the dead-zone model to analyze the influence of different backlashs on the system.The elastic deformation was established by ANSYS and Adams co-simulation.In order to reduce the influence of nonlinear extraneous factors on the system,the PID control method is used to reasonably adjust the PID parameters of the speed loop and the position loop,and the slope signal and sinusoidal signal are input to compare and analyze the influence of nonlinear interference.Finally,the simulation analysis is carried out by Adams and mathematical software co-simulation to verify that the design requirements are met.