Research On Reliability Analysis Framework And Evaluation Model Of Manufacturing System

Regardless of decision-making or production management,the reliability of the manufacturing system is an important measure of performance.The main problems in the previous studies are reflected in the lack of a clear definition of the research scope and the lack of a unified research framework.In addition,the reliability indicator finally appears as a probability.While providing an intuitive performance evaluation,this probability can also provide an important reference for the managers of an enterprise when making business decisions because the probability is a good risk assessment index.The research in this article is aimed at the design and evaluation of the manufacturing system,and from the perspective of reliability,to re-understand the connotation of the manufacturing system.The article studies the reliability of manufacturing systems from two aspects of qualitative research and quantitative research.The main content of qualitative research is to redefine the manufacturing system reliability(MSR)and provide a framework model for reliability analysis of manufacturing systems.The purpose is to provide a research framework and research ideas for manufacturing system reliability problems.In terms of quantitative research,for the purpose of designing and evaluating the manufacturing system,in order to make the research content more complete,this paper selects two typical research objects,Job shop and Flow shop.The specific research contents are: Job shop unit construction considering reliability index and Flow shop assembly manufacturing system performance evaluation problem considering reliability index,and the research method adopts mathematical programming method and random flow network method respectively.Specific studies include the following aspects:(1)Established a framework model for reliability analysis of manufacturing systems.The article first describes the structural elements of the manufacturing system through detailed description of the structural topology of the manufacturing system.On this basis,the concept and connotation of reliability are discussed.The definition of manufacturing system reliability(MSR)is given,and the difference and connection between this definition and traditional(product)reliability are pointed out.Based on the definition of reliability(ability to perform the specified function),the functionality of the manufacturing system is further discussed.On this basis,the paper analyzes the failure modes and influencing factors of the manufacturing system,establishes the reliability analysis framework model of the manufacturing system,defines the reliability of the manufacturing system in detail,and provides a framework and ideas for the study of the reliability of the manufacturing system.(2)The problem of static cell construction under the Job shop environment was studied,that is,the single production stage did not consider the dynamic changes of production and demand environment.This paper first establishes the mathematical model of the production unit through the mathematical programming method.By selecting the appropriate processing route,the equipment is grouped based on the minimization of the logistics cost between the units,and the delivery reliability of the manufacturing system is defined,and a 0-1 integer programming model is established.Through the two constraints of minimizing the total cost and maximizing the delivery reliability,the manufacturing unit in the static environment is finally constructed.(3)Study the dynamic unit construction problem in Job shop environment,that is,consider the dynamic changes of production and demand environment in multiple stages.In the same way,this paper selects the appropriate processing route,divides the equipment based on the inter-unit logistics cost and the unit reconfiguration cost minimization.Based on the establishment of the 0-1 integer programming model,the phase-control variables are added to study the cell construction problem under the dynamic environment.Ultimately,this paper constructs a manufacturing unit under dynamic environment through two constraints: minimization of total cost and maximum reliability of delivery.Finally,the static unit construction and the dynamic unit construction problem are compared and analyzed.It is proved that using the dynamic unit construction mathematical model when constructing the production unit can get better effect and lower unit construction cost.The article also proves that in the process of unit construction,if the reliability index can be considered at the same time,it can effectively help the business managers make decisions.(4)The performance evaluation of the assembly manufacturing system under the flow shop environment is studied.The evaluation index is the reliability of the system,that is,the system's ability to satisfy orders within a given time.In the field of application of random flow network for system reliability evaluation,this article for the first time takes the assembly line as a non-serial structure manufacturing system as the research object,and also considers the assembly manufacturing system that has a rework operation.Based on the method of stochastic flow network theory,this paper begins with the construction of the network model of general assembly manufacturing system,and further establishes a reliability evaluation model for single-product assembly lines and multi-product assembly lines with rework paths.The general algorithm for solving the model is given,and a complete reliability evaluation method for the assembly manufacturing system is obtained.