| The U assembly line is derived from the TOYOTA lean production model and has been widely used in the global scope.The production mode of the segmented U assembly line is the most common.Each production unit is composed of one worker and several machines.This type of unit production can also become a "one man multi machine" mode of production,in this mode.The behavior performance of the workers is particularly important.Whether it is the change of the working speed,the behavior decision or the human error will have a significant impact on the output of one person multi machine system.A U assembly line contains multiple one man multi machine system.Obviously,the performance of human behavior will eventually produce the performance of the whole production system.Therefore,studying the behavior of people in the production line is of great theoretical and practical significance for improving the efficiency of U production line.The purpose of this paper is to study the factors affecting the performance of one man multi machine production system including human behavior model in U assembly line.(1)constructing a more perfect human behavior model,taking a U type assembly line as the research background,collecting the main factors affecting workers' working speed by issuing questionnaires to workers,including four aspects of physical fatigue,psychological load,time pressure and human error,and the psychological load contains the perceptual load.With the cognitive load,the time pressure comes from the quantity of the WIP in the tour cycle and the buffer zone,and the impact of the influence factors on the speed of the work is obtained through the information collection.Then the VACP method is used to quantify the psychological load,and the membership degree function of fuzzy mathematics is used to quantify the other factors,and the Em-plant discrete event simulation software is used as the carrier to build the U assembly line simulation model containing the worker's behavior model.Subsequently,the validity of the simulation model is verified from two aspects: the error of worker operation time and the daily output of the production line.(2)on the basis of the study of the workers' behavior model,one person multi machine experimental research is carried out.First,the orthogonal experiment design is carried out.The controllable factors include the number of workers' stands,the distribution pattern of machine reliability,the mode of man-machine coordination,the time of task and the time distribution pattern of manual work,and the uncontrollable factors include machine failure and the loss of workers.Em-plant simulation software is also used to experiment on the experimental carrier,and the experimental results are analyzed with extreme difference and variance,and the relative influence degree of each factor on the performance of one man and multi machine production system is obtained.At the same time,the best sexual energy of the production system can be reached under the combination of all factors,and the production line design and process arrangement are provided Effective reference.The experimental results show that:(1)compared with other factors,the man-machine collaborative model has the greatest impact on the one man and multi machine production system,and the worst cooperative mode is man-machine synchronization,which will be more affected by machine failure and the performance of workers.(2)when the working time of the production line is allocated,the total task time is gradually set up or gradually reduced,while the manual work time according to the bowl or inverted bowl shape will effectively improve the performance of the production system. |
PDF Full Text Request