Application Research Of The Flexible Manufacturing Systems Scheduling Theory

Flexible manufacturing system (FMS) as a multi-variety and small-batch production automated manufacturing systems, attaches great attention and in-depth research for its flexible and efficient processing mechanism. Compared with the traditional manufacturing systems, FMS’s structure is more complex, higher initial investment costs, In order to reduce production costs, ensure the FMS operating safe and efficient, It is of great significance to study its three key technologies which is production scheduling, implementation and production monitoring.This subject focuses on scheduling model and scheduling algorithm of FMS and makes a deep study about these two problems. First of all, The Petri net modeling theory, method and application on flexible manufacturing system are complete analyzed, and Petri net model in flexible manufacturing system are described. Second, according to the study of Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) algorithm,then analyzes the feasibility combination of the two algorithms. In this algorithm, the particle swarm algorithm shares its history optimal feasible solution with, the GA, The genetic operators searches and evoles based on these feasible solutions and updates history optimal feasible solutions.The algorithm combines the advantages of GA and PSO respectively,then by way of examples based on the Petri nets model of FMS to explain the process of this algorithm to solve scheduling problem.Furthermore, according classical test problems to verify the algorithm can solve job shop scheduling problem with good performance.Designed a flexible manufacturing cell platform based on CC-Llink fieldbus, it is a form of miniaturization, commoditization to realize FMS. It mainly composed of a six degrees of freedom industrial robot, two sets of machine tools and controlled PLC. Study the whole hardware platform, software design process and design program about six degrees of freedom of the industrial robot and CC-Link communication which use the PLC as the core of control unit; Adopt touch screen human-machine interface for real-time monitoring of the production site.Thesis used Ethernet technology to set up a monitoring platform for the FMS, realized the communication between the PC and the master PLC. According to the actual system functionality and security needs, related the relevant variables associated with the data of the main PLC to realize the aim of the PC can real time correct the field data and device at field can be on-line controlled and monitored of each state.Finally, through the various components of the flexible manufacturing cell and monitoring systems for joint commissioning, the validity and practicability of the platform can be verified.