Development of measurement and control system for CTS in 2m×2m supersonic wind tunnel

In order to meet the requirement of Captive Trajectory Simulation tests in 2m-scale supersonic wind tunnel,the CTS facility and the corresponding measurement and control system are developed in the 2m×2m supersonic wind tunnel.In order to realize the closed-loop velocity control mode,a multi-layer distributed structure with a centralized control test technique is selected for the construction of the measurement and control system which must meet the high demands of real-time processing and information interaction tasks.The system consists of three subsystems,namely,the signal measurement and motion equation solver subsystem,the 6-DOF motion control subsystem ,and the safety supervising subsystem.The softwares of monitoring and management,data acquisition and trajectory generation,and security monitoring are devel-oped by LabVIEW.The motion control execution software is developed by IndraWorks.The information interaction among subsystems is implemented through TCP/IP,PSP and Profibus DP.The key technical problems such as shock resistance and velocity control are solved.Static accuracy of the 6-DOF rig is measured by T3-40 laser tracker which shows that the positioning accuracy of linear displacement X ,Y and Z achieves 0.021mm,0.046mm and 0.094mm respec-tively,the positioning accuracy of angular displacement α,β and γ achieves 0.05°,0.047° and 0.022°,respectively.The accuracy is better than that of design index(±0.1mm,±0.1mm, ±0.1mm,0.05°,0.05°,0.05°).The debugging and wind tunnel tests show that the system is sta-ble,reliable,and easy to use and maintain;the test results are reasonable,and the data obtained are reliable.