U-shaped Line Modeling Of Human-machine Interference Time Based On Weight Method

Manufacturing industry plays an important role in our country.It is not only a pillar industry but also an important economic lifeline of our country.Especially after China put forward "Made in China 2025",manufacturing industry is becoming more and more important.The core of manufacturing industry is production line.Basically,all logistics,systems,products and workers are based on production line,so production line is the main part.Good or bad will determine the level of profits of enterprises,so the study of production line is very necessary.Due to the limitation of space and product type,the production line can be divided into straight line,U-type,L-type,S-type and so on.The object of this paper is U-type production line.U-type production line has the characteristics of high production efficiency and more fluent logistics.In U-type production line,there will be human-machine interference because of the phenomenon that a worker serves multiple machines.In the traditional modeling research of U-shaped line,the effect of operator on production line is not considered,but the production line is simply described from three perspectives of machine,buffer and parts.In this paper,the influence of operator on production line will be fully considered in the mathematical modeling of U-shaped production line.In order to achieve this goal,this paper carries out the following work: The following research:Firstly,for the phenomenon of one person and many machines in U-shaped line,it is precisely because of the existence of one person and many machines to model one person and many machines workstation.Through analysis,we can see that one person and many machines work system is mainly composed of two queuing systems,which are part and machine queuing system and machine and operator queuing system.In this paper,closed-loop queuing network and open-loop queuing network are used for these two systems.The system is described.Finally,the variant square coefficient network method is used to solve the model of one-man multi-machine workstation,and the average waiting time of each machine in one-man multi-machine workstation is obtained.After calculating the average waiting time,the time is redistributed to overcome the problem of large error in modeling results.For this reason,we solved the human-machine interference time of each machine.In order to solve the average human-machine interference time of each machine,this paper first analyzed the main factors affecting the human-machine interference time,then carried out simulation experiments,and found the human through statistical knowledge.The turning point of the machine interference time is then allocated to each machine by using the weighted method.After that,an experiment is designed to verify the credibility and accuracy of the model.On this basis,combined with the processing time of the original machine,the principle of efficiency equivalence is used to synthesize the weighted equivalent machine adding time of the machine.The model is modeled by the series queuing network model,and solved by the decomposition method.Finally,the production efficiency of the whole production line is obtained.Then we use Em-plant simulation software to simulate the original production according to the actual situation of the production site.Line simulation,theoretical numerical simulation and discrete-time simulation show the importance of considering human influence in production line modeling.At the same time,through the comparison of efficiency,the accuracy of U-shaped line modeling for allocating human-machine interference time by weighted method proposed in this paper is verified.