The flexible job-shop scheduling problem(FJSP)with combined processing constraints is a common scheduling problem in mixed-flow production lines.However,traditional methods for classic FJSP cannot be directly applied....The flexible job-shop scheduling problem(FJSP)with combined processing constraints is a common scheduling problem in mixed-flow production lines.However,traditional methods for classic FJSP cannot be directly applied.Targeting this problem,the process state model of a mixed-flow production line is analyzed.On this basis,a mathematical model of a mixed-flow job-shop scheduling problem with combined processing constraints is established based on the traditional FJSP.Then,an improved genetic algorithm with multi-segment encoding,crossover,and mutation is proposed for the mixed-flow production line problem.Finally,the proposed algorithm is applied to the production workshop of missile structural components at an aerospace institute to verify its feasibility and effectiveness.展开更多
以无线射频识别技术(Radio Frequency Identification,RFID)为研究对象,概述该技术的基本定义、组成部件、基本工作原理,并详细阐述SICK品牌RFID在自动焊装生产线中的安装形式、参数设置方法、硬件网络组成原理、软件控制方法和信息解...以无线射频识别技术(Radio Frequency Identification,RFID)为研究对象,概述该技术的基本定义、组成部件、基本工作原理,并详细阐述SICK品牌RFID在自动焊装生产线中的安装形式、参数设置方法、硬件网络组成原理、软件控制方法和信息解析方式。利用标签中刻制的车型信息实现了生产线上高低配车型的自动识别和混流生产工艺方案,具有安装形式简单、识别速度快、信息准确的特点。车型生产任务由上位机自动下发至线体,能够远程控制车型配比,具备了很高程度的数字化生产能力,极大提高了生产效率和自动化水平。展开更多
Green manufacturing is a growing trend,and an effective layout design method for production lines can reduce resource wastage in processing.This study focuses on existing problems such as low equipment utilization,lon...Green manufacturing is a growing trend,and an effective layout design method for production lines can reduce resource wastage in processing.This study focuses on existing problems such as low equipment utilization,long standby time,and low logistics efficiency in a mixed-flow parallel production line.To reduce the energy consumption,a novel method considering an independent buffer configuration and idle energy consumption analysis is proposed for this production line’s layout design.A logistics intensity model and a machine tool availability model are established to investigate the influences of independent buffer area configuration on the logistics intensity and machine tool availability.To solve the coupling problem between machine tools in such production lines,a decoupling strategy for the relationship between machine tool processing rates is explored.An energy consumption model for the machine tools,based on an optimized configuration of independent buffers,is proposed.This model can effectively reduce the idle energy consumption of the machine tools while designing the workshop layout.Subsequently,considering the problems encountered in workshop production,a comprehensive optimization model for the mixed-flow production line is developed.To verify the effectiveness of the mathematical model,it is applied to an aviation cabin production line.The results indicate that it can effectively solve the layout problem of mixed-flow parallel production lines and reduce the idle energy consumption of machine tools during production.The proposed buffer configuration and layout design method can serve as a theoretical and practical reference for the layout design of mixed-flow parallel production lines.展开更多
基金supported by the National Key Research and Development Program of China (No.2020YFB1710500)the National Natural Science Foundation of China(No.51805253)the Fundamental Research Funds for the Central Universities(No. NP2020304)
文摘The flexible job-shop scheduling problem(FJSP)with combined processing constraints is a common scheduling problem in mixed-flow production lines.However,traditional methods for classic FJSP cannot be directly applied.Targeting this problem,the process state model of a mixed-flow production line is analyzed.On this basis,a mathematical model of a mixed-flow job-shop scheduling problem with combined processing constraints is established based on the traditional FJSP.Then,an improved genetic algorithm with multi-segment encoding,crossover,and mutation is proposed for the mixed-flow production line problem.Finally,the proposed algorithm is applied to the production workshop of missile structural components at an aerospace institute to verify its feasibility and effectiveness.
文摘以无线射频识别技术(Radio Frequency Identification,RFID)为研究对象,概述该技术的基本定义、组成部件、基本工作原理,并详细阐述SICK品牌RFID在自动焊装生产线中的安装形式、参数设置方法、硬件网络组成原理、软件控制方法和信息解析方式。利用标签中刻制的车型信息实现了生产线上高低配车型的自动识别和混流生产工艺方案,具有安装形式简单、识别速度快、信息准确的特点。车型生产任务由上位机自动下发至线体,能够远程控制车型配比,具备了很高程度的数字化生产能力,极大提高了生产效率和自动化水平。
基金The authors gratefully acknowledge the financial support from the National Science and Technology Major Project of China(Grant No.2019ZX04024001)the Natural Science Foundation of Beijing Municipality(Grant No.3192003)+2 种基金the General Project of Science and Technology Plan from Beijing Educational Committee(Grant No.KM201810005013)the Tribology Science Fund of State Key Laboratory of Tribology(Grant Nos.STLEKF16A02,SKLTKF19B08)the Training Program of Rixin Talent and Outstanding Talent from Beijing University of Technology.
文摘Green manufacturing is a growing trend,and an effective layout design method for production lines can reduce resource wastage in processing.This study focuses on existing problems such as low equipment utilization,long standby time,and low logistics efficiency in a mixed-flow parallel production line.To reduce the energy consumption,a novel method considering an independent buffer configuration and idle energy consumption analysis is proposed for this production line’s layout design.A logistics intensity model and a machine tool availability model are established to investigate the influences of independent buffer area configuration on the logistics intensity and machine tool availability.To solve the coupling problem between machine tools in such production lines,a decoupling strategy for the relationship between machine tool processing rates is explored.An energy consumption model for the machine tools,based on an optimized configuration of independent buffers,is proposed.This model can effectively reduce the idle energy consumption of the machine tools while designing the workshop layout.Subsequently,considering the problems encountered in workshop production,a comprehensive optimization model for the mixed-flow production line is developed.To verify the effectiveness of the mathematical model,it is applied to an aviation cabin production line.The results indicate that it can effectively solve the layout problem of mixed-flow parallel production lines and reduce the idle energy consumption of machine tools during production.The proposed buffer configuration and layout design method can serve as a theoretical and practical reference for the layout design of mixed-flow parallel production lines.
