Design And Experiment Of The Control Softwares Of The â…¡ And â…¢ Feed Positioning Subsystems For The LT50m Model

Based on the opto-electro-mechanical innovation design for the new generation oflarge radio telescopes(LT), this thesis presents the design requirements of the three-leveladjustment system. Meantime, aiming at the high-precision tracking demand of the feedpositioning system and combining with the practical engineering, we design the controlsoftwares of the feed positioning subsystem in level II and III on the basis of theSynqNet network motion control respectively, which is also known as the the subsystemcontrol softwares for the AB axis and the fine-adjustment Stewart platform. Thus thereliable experimental platform is provided for research of the three-level compoundcontrol and the specific work of this thesis can be generalized as below:Firstly, the characteristics of the distributed architecture based two-level controlsystem are reviewed and the three-level adjustment project is investigated to satisfy thedesign requirement of the maximal zenith angle of60°. Then, the control and themeasurement strategies and the communication protocol are proposed for the three-levelcompound control.Secondly, the position kinematics analysis is conducted respectively for the ABaxis and the fine-adjusting Stewart platform. Furthermore, the solving algorithm ispresented to obtain the positive and inverse solutions of these two mechanisms, and itssoundness and feasibility are verified by the numerical simulations.After that, in light of the available hardware resources, the open distributed motioncontrol project based on the PC+motion control card is chosen and applied in thedevelopment of the two subsystem control softwares in the VC++6.0environment.Finally, the good performance of the hardware and software of the level II and IIIsubsystems are proved with a great deal of experiments under the LT50m model.Moreover, the control effect is validated based on the debugging of the three-levelsystem and the anti-interference test, which lays a firm foundation for improving theoverall performance of the control system.