Research On Key Technologies Of RFID Middleware For MES In Flexible Manufacturing

Flexible manufacturing system(FMS)is an important production mode which is widely used to meet the market demand for multi variety and small batch products.In order to improve the production efficiency of FMS,intelligence and informatization are the inevitable trend of its development.Manufacturing execution system(MES)is a vital tool for information acquisition,analysis and application of flexible manufacturing process,which provides information support for intelligent scheduling decision of FMS.Information acquisition and processing in production site is one of the important functions of MES.As a long-distance noncontact automatic information identification technology,radio frequency identification(RFID)technology is widely used in MES information collection of flexible manufacturing system because of its advantages of high identification frequency,reusable electronic tags and stain resistance.However,the unreasonable planning of RFID network and the problem of RFID missing data will reduce the perceived data quality of RFID middleware and affect the reliability of MES operation and the accuracy of decision-making.Therefore,this paper studies the above key technologies of RFID Middleware for FMS,and the main research contents are as follows:(1)RFID network planning research.In order to solve the problems of conflicting coverage of omnidirectional antenna reader in RFID network planning,based on the advantages of strong anti-interference ability and flexible radiation direction of the directional antenna reader,this paper proposes to the directional antenna reader into RFID network planning,and studies the hybrid RFID network planning problem in the application environment of omnidirectional and directional antenna reader at the same time.First of all,based on omnidirectional and directional antenna radiation model,a hybrid RFID network planning model is established,which takes the electronic tag repetition rate and network load balance as the optimization objective,with coverage as the constraint.Secondly,the integration of genetic algorithm and redundant reader elimination(IGARRE)is designed to solve the model.The case study shows that the introduction of directional antenna reader can effectively reduce the RFID coverage repetition rate,and the proposed IGARRE method is effective for hybrid RFID network planning.(2)Research on RFID missing data completion.This paper focuses on the problem of data missing in the multi reader environment of FMS.In this paper,the RFID configuration mode and the problem of data missing in the flexible manufacturing environment are described and analyzed,and the model of RFID data missing is established.The route constraint and fixed sliding window algorithm(RC-FSWA)based on path constraint is designed to complete two kinds of missing data.In this method,fixed sliding window algorithm is used to complete the missing data in a single reader,and the whole missing data in the multi reader environment is supplemented according to the workpiece processing path constraint information.Case analysis shows that the RC-FSWA method proposed in this paper is effective in solving the problem of RFID missing data completion in the multi reader environment.(3)Based on the research results of RFID network planning and missing data completion,the prototype system of RFID middleware key technology is developed by using C# and MATLAB language,and the research methods of RFID network planning and data missing are verified by actual cases.The above research results of RFID network planning and missing data completion methods can effectively improve the efficiency and reliability of data acquisition and processing for FMS,and have important practical significance and application value for improving the production efficiency of FMS.