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Design and Research on Monitoring and Diagnosis System of Superconducting Medium Radiator Automatic Filling Production Line

Author: LiuYang
Tutor: LiuSheng
School: Harbin Engineering University
Course: Control Theory and Control Engineering
Keywords: Radiator filling production line Monitoring system Fault tree AHP Fault Diagnosis
CLC: TP277
Type: Master's thesis
Year: 2013
Downloads: 30
Quote: 0
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Abstract


Scientific and technological progress will inevitably improve living standard, the dailyheating is the essential part of people’s lives. The use of vacuum superconducting mediumradiator heating is a new way of consuming environmentally friendly energy.Superconducting radiator has many advantages, water and energy saving, fast heat conduction,strong corrosion resistance etc, and will replace plumbing radiator to become daily heatingequipment. At present, China is in its infancy in the production of vacuum superconductingradiator, it is practical and meaningful to do research on control, monitoring and faultdiagnosis of superconducting radiator production line. In this paper, according to the radiatorfilling process and control requirements, the design for automatic production assembly line ofsuperconducting was based on Siemens PLC. On this basis, the design for production linemonitoring system was to monitor the filling process and device status. The fault diagnosissystem had been established on the analysis of the reasons leading to the failure of theproduction line and the establishment of the fault tree of the production line，which couldperform the diagnosis of the filling process according to failure phenomenon.Firstly, this paper introduces conduction process and equipment composition ofproduction line. According to the radiator filling process and control requirements, the designfor automatic production assembly line of superconducting medium radiator was based onSiemens PLC. The design of this control system includes the selection of PLC type and thedesign of control process. Additionally, according to the characteristics of the control systemand industrial bus technology, the design of production line network structure was finished byusing Profibus-DP and PROFINET technology respectively applied in different network layerof DCS. On this basis, the monitoring system which contains friendly man-machine interfacewas designed by using WinCC software. This system could satisfy the task of monitoringprocess and state of production line.Secondly, the fault tree model had been built according to the analysis of the reasons thatled to the failure of system. An improved analytic hierarchy process method which provides anew way to calculate weight of the fault tree which contains duplicate basic events wasproposed. This method could be applied to the calculation of the production line fault treeweight. After the introduction of expert system theory, fault tree was used as knowledgesource, and was converted to the rules by the production representation method. The design and realization of fault diagnosis system was established on the basis of appropriateknowledge base, database and strategy of the hybrid reasoning.Finally, this paper verifies the function of two systems through different tests andsimulations. During the process of test, according to the test input data, the monitoring systemcould display the state of monitored variable, the change of archived data and the alarmmessage of temperature and liquid level value. The fault diagnosis system has the function offailure cause query, diagnosis, record, employee information maintenance etc, and providesdiagnostic results and fault solutions. Two systems can meet the requirements of monitoringand fault diagnosis of the production line and have practical application value.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Monitoring, alarm,fault diagnosis system
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