检索结果-南通市图书馆

Autonomy-subnet based structural synthesis and liveness guarantying policy of Petri net model of flexible manufacturing system

引用

Science in China(Series F) 2004年第3期47卷 273-286页

作者： XUELei HAOYue LucentTechnologies ChinaBellLabsInnovationsBeijing100080China InstituteofMicroelectronics XidianUniversityXi'an710071China

In this paper, an autonomous subnet based structural methodology forbottom-up synthesis of Petri Nets for flexible manufacturing Systems is proposed.Furthermore, the theoretical analysis of the model constructed by the method is carried byintensively using model's structural information, such as invariants, siphons, etc.. As aresult, the analysis leads us to draw the general conclusion that the model obtained isconservativeness and thus bound, and characterize its liveness in terms of zero-markingminimal siphons. It is based on model's structural information that distinguishes ourmethod from others. in line of this thought, a liveness guarantying policy for the obtainedmodel is proposed. Some control subnets are merged into the original model according tothe proposed synthesis rules in this paper to ensure that no minimal siphons are emptiedin any state, therefore the liveness is guaranteed. As a result, a live, conservative andrevertible Petri Nets is obtained. A practical example is also presented to demonstrate theeffectiveness of this method.

关键词： flexible manufacturing Petri nets and structural synthesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on High Volume flexible manufacturing by Using the Sheet Metal Roll Forming Process

Study on High Volume Flexible Manufacturing by Using the She...

引用

第十届中国钢铁年会暨第六届宝钢学术年会

作者： Albert Sedlmaier Thomas Dietl Data M Sheet Metal Solutions GmbH

Increasing model variety, more vehicle customization and shorter innovation cycles have a strong impact on productivity and quality. The number of platforms and body types are permanently increasing inside a plant, leading to high tool and set-up costs in the body in white section of the factory. Moreover, as legislation sets mandatory emission reduction targets for new cars and trucks, new lightweight design strategies for the "Body-in White"（BIW） need to be found like ultra-high tensile materials with important springback and load optimized design of parts leading to complex geometries. Often parts of the BIW belong to a family differing only in a single geometrical parameter like overall length or width, or even only in material thickness. Hence,the companies tend to replace manufacturing processes like press forming due to their lack of flexibility by other more flexible production methods. We present a new manufacturing system using the sheet metal roll forming process to overcome many of these challenges. Traditional roll forming lines only produce parts with constant cross sections. A new 3D roll forming line for complex structural automotive parts opens new ways for production. It also gives more flexibility and higher product *** this study, an overview is given for possible families of parts being produced with this new production technique. The basic machine concept and its current application is shown.

关键词： flexible manufacturing mass production 3D-roll forming sheet metal forming truck beam

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on scheduling algorithm for multiple handling requests of single automated guided vehicles

引用

High Technology Letters 2019年第3期25卷 334-339页

作者： Lu Yuan Feng Kuikui Hu Ying College of Electrical and Mechanical Engineering Nanchang University

To solve the problem of small amount of machining centers in small and medium flexible manufacture systems(FMS), a scheduling mode of single automated guided vehicle(AGV) is adopted to deal with multiple transport requests in this paper. Firstly, a workshop scheduling mechanism of AGV is analyzed and a mathematical model is established using Genetic Algorithm. According to several sets of transport priority of AGV, processes of FMS are encoded, and fitness function, selection, crossover, and variation methods are designed. The transport priority which has the least impact on scheduling results is determined based on the simulation analysis of Genetic Algorithm, and the makespan, the longest waiting time, and optimal route of the car are calculated. According to the actual processing situation of the workshop, feasibility of this method is verified successfully to provide an effective solution to the scheduling problem of single AGV.

关键词： automated guided vehicle(AGV) flexible manufacturing scheduling policy makespan genetic algorithm priority

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Learning of Iterative Learning Control for Batch Processes

Learning of Iterative Learning Control for Batch Processes

引用

第32届中国过程控制会议(CPCC2021)

作者： Zhixing Cao Libin Xu Jingyi Lu Furong Gao Feng Qian MOE Key Laboratory of Smart manufacturing in Energy Chemical Process East China University of Science and Technology Department of Electrical Engineering Paderborn University Department of Chemical and Biological Engineering Hong Kong University of Science and Technology

flexible manufacturing as an essential component of smart manufacturing implements the customized production mode,thereby requesting fast controller adaptation for producing different goods but still with high *** problem becomes even acute for batch *** we present a solution called learning of iterative learning control(ILC) based neural *** is able to recommend control parameters for ILC controllers accordingly,so as to yield fast tracking error convergence and smaller steady-state error for disparate set-point profiles,which is deemed an abstraction of different production *** method substantially outperforms a benchmark ILC on a variety of systems and cases,thereby showing its potential of deployment on the industrial internet of things.

关键词： Batch Process Iterative Learning Control Neural Network flexible manufacturing

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：