Design And Implementation Of Control System Of Four-point Contact Ball’s Bearings Running In Vacuum Device

Four-point contact ball’s bearings running in vacuum device as a test satelliteequipment parts, mainly for test control moment gyroscopes with a four-pointcontact ball bearings, it needs to be run before loading into the machine.Fit insidethe bearing and the bearing friction torque is an important technicalindicators,while the bearings’ cooperation and friction torque affected by manyfactors, which need to analyze the data form control devices to draw conclusions.This thesis first discusses the overall structure of Four-point contact ball’sbearings running in vacuum system design, gives a functional description of thevarious components and performance indicators, and the electronic components ofthe model selected. On this basis, focuses on the two key issues of Four-pointcontact ball’s bearings running in vacuum device: Four-point contact ball’sbearings running in vacuum device algorithm design and PC software design.In the control algorithm, the Four-point contact ball’s bearings running invacuum unit for data acquisition and processing system requirements for real-timeand high precision, considering the conventional PID control algorithm, after theexperiment found that the conventional PID control algorithm in this Four-pointcontact ball’s bearings running in vacuum device can not achieve satisfactoryresults, then this thesis presents a fuzzy control algorithm. As Four-point contactball’s bearings running in vacuum device have high demands on control precision,response speed, system stability and adaptability, while fuzzy control algorithmcombines the expertise, does not depend on accurate mathematical model of thecontrolled object,designing simply, having strong interference ability and fastresponse, and have strong robustness on the system parameter changes, makingthe system more stable and reliable. Through simulation experiments of the twocontrol algorithm prove that fuzzy control algorithm has good control effect.A C/S architecture based on the finite state machine is proposed in this thesisfor the design of the PC control software which is responsible for the dataacquisition and processing system of the human interface device telemetry. Thisarchitecture can improve the real-time response ability of data and separate thetasks thus has better modular and scalable properties. During the data processing,the mean filtering is adopted which is a fast and easy-to-use algorithm. The meanfiltering can also reduce random error signals thus is suitable for the occasions ofindustrial machines.