Design And Research Of Captive Trajectory System In Continuous Transonic Wind Tunnel

The continuous transonic wind tunnel is the key matching test technology of the large transonic wind tunnel which is being demonstrated in China.The development of the continuous transonic wind tunnel capture track system(CTS--Captive Trajectory System)is one of the key matching test techniques.With the development of the times,more and more objects are being tested and the size is also getting larger and larger.The old CTS has been difficult to meet the needs of national defense.And with the renewal of the weapon,new requirements are put forward for the stability and reliability of the system.Therefore,the new CTS will have strong model test ability and play a key supporting role in the independent innovation research of our aircraft.It has important national strategic significance and engineering application value.In this paper,a continuous transonic wind tunnel CTS was taken as the research object,the design of the mechanical body was completed,and the key components,position reliability and trajectory planning of the six freedom mechanism were separately studied.The main contents of this thesis are as follows:(1)Based on the research status of CTS at home and abroad,three kinds of six degrees of freedom mechanisms were designed,and a new six degree of freedom mechanism was put forward based on the advantages and disadvantages of all the mechanisms.(2)In order to ensure the jam degree and deformation requirements of the mechanism,the rotating frame was optimized based on the multi-objective genetic algorithm,Then,the jam degree,modal and statics properties of the six-DOF mechanism were analyzed to verify the rationality of optimization design.(3)The kinematics model of six degree-of-freedom mechanism was established,combined with the principle of error independence,the sensitivity of the anisotropic position error was analyzed,and the maximum error source was obtained.(4)On the basis of kinematics,the Monte Carlo method was used to simulate the position reliability of the six degree of freedom mechanism,in order to verify the rationality of the mechanism design.(5)Finally,the trajectory planning method was studied.Three steps spline interpolation,five polynomial interpolation and combined sine interpolation method were used to plan the trajectory.Through simulation analysis,a trajectory planning method that can meet the test requirements was selected.