Design Of Intergrated Interlocking Framework For Aircraft Final Assembly Line

In the aircraft assembly line,information of moving elements,including people,materials,tools,components,etc.,is not accessible for the system.And facilities,assembly platform,and moving elements are not connected.Fact above leads to the problem that,in some assembly processes,elements can’t coordinate autonomously with each other.So that it causes much human resources to observe,judge,and operate,which will affect the safety and efficiency of the assembly process.Firstly,the concept of intergrated interlocking in aircraft assembly is introduced.On this basis,this thesis analyzes the necessity and importance of IOT in aircraft assembly process.Then it summarizes the application of IOT technology in different fields and emphasis on the expansion of the industrial IOT system-Cyber-Physical System.Secondly,some key technologies in the design of intergrated interlocking framework are introduced,including the characteristic,construction method and the event model of Cyber-Physical System.And the localization methods of moving elements in the assembly line by RFID system.This part studies the principle of RFID positioning and the advantages and disadvantages between the various positioning algorithms.Thirdly,on the basis of analyzing the characteristics of different elements in the aircraft final assembly line,the specific element information integration scheme is given,which makes the isolated "information island" interlocked in the assembly process.Then,the paper focuses on the information collection method of moving elements:the position of moving elements is determined by the combination of location fingerprint localization scheme and the proximity positioning scheme,and an improved K-nearest neighbor algorithm is proposed to improve the positioning accuracy.Finally,an intermediation framework of aircraft assembly assembly line based on assembly process is constructed by using state machine and event-driven information physical system(CPS)space-time modeling method.The interlocking integration framework is divided into three layers:the physical layer,the element agent layer and the decision layer.According to the different attributes of the event,it can be also divided into two parts:information flow and control flow.The physical layer is mainly composed of sensors and actuators,which are used to sense and change the state of the production line elements.The element agent layer is mainly responsible for maintaining the real-time status of the elements and receiving the control events.The decision-making department is responsible for the interlocking judgment of the whole system to ensure the safety and the efficiency of the process implementation.This paper takes the final assembly line of a certain type of aircraft as an example and expounds the concrete realization form of the intergrated interlocking framework.