| The test-analysis and running-in control system of slip ring is a typical groundtest equipment for spatial mechanism parts, mainly used for simulating space slip ringruntime environment, monitoring the change of slip ring performance index in a longrunning state so that to achieve the objective of the analysis of the conductive ring lifeand performance. The main goal of this research is to design and implement the slipring test and running-in control system.This paper briefly describes the research background and research status ofdomestic and foreign, and then start from the overall design of thesystem to determine the composition, structure and the overall framework of thesystem, and make a detailed analysis of functional requirements and performancerequirements. And start from the system hardware design and implement todescribe the system hardware module definition and system interfacedesign, discusses the hardware security measures of reliability, safety, electromagneticcompatibility, safety etc. Then the two key problems in implementingthe system,system control algorithm and the NTC thermistor R-T curve fittingmethod is carried on the thorough research. In system running-in control algorithmresearch, because of the space conductive ring particularity, the control system has ademand for high precision, high stability, wide speed range, high real-timeperformance, high anti-interference, such as conventional PID control algorithm can’tmeet the requirements of the system, so according to the characteristics of the systemcontrol,this paper improves the traditional PID control algorithm, and combiningwith the speed feedforward-feedback and acceleration feedforward-feedbackcontrol system, formed the new velocity feedforward acceleration feedforward PIDservo control algorithm, through the simulation experiments show the good positiontracking precision, response speed and anti-interference ability. In the R-T curve ofNTC thermistor fitting problem, according to a conventional fitting method in thewidth of the range with low fitting precision problem, puts forward the piecewisechebyshev polynomial fitting algorithm, the algorithm divides the entire measuringrange into several segments and using chebyshev polynomial fits each segment,proved has good fitting precision of temperature measurement accuracy of the system.Then the design and implementation of system embedded computer software aredescribed in detail, on the design of system software based on the modular thought,independent module function, good for extend and maintain. Human-computerinteraction interface to discard the traditional centralized text box display mode, adopts the form of the curve chart shows that more conducive to testers observationand analysis. After data acquisition using window average filtering algorithm for dataprocessing, effectively reduce the noise interference. By using the database Accessenterprise manage to collect data and configuration, benefited for data query and safestorage. At last, carried on the comprehensive system testing, verified the stability andreliability of the system.The completion of the system contributes to understanding of the changingregularity of performance index such as mechanical properties and electricalproperties of conductive ring in a wide temperature range under different workingmode.it is important for conductive ring working safely and stably and efficiently in acomplex environment. |
