Development of a shipyard simulator based on Petri nets

There are many restrictions on production in the factory. The most efficient production schedule should be planned taking these restrictions into account. Professional skill is necessary to plan the best schedule. A schedule planner has to deal with so much information during production planning that it is difficult to plan the best production schedule with a consideration of so many restrictions. In this study we introduced the use of Petri nets to support such production planning with a computer. Petri nets have been widely used to simulate production because of their capability of modeling concurrency, synchronization, and sequencing in discrete-event systems. This paper reports on implementing a simulation system for the shipyard. We had already implemented a production planning support system for a shipyard that is a part of the computer integrated manufacturing (CIM) system in shipbuilding. Based on this system, we implemented a shipyard simulator that can simulate the production activity in the shipyard. We therefore have defined a shipyard model. The production conditions can be changed, and the efficiency of a schedule can be evaluated. This paper discusses the effectiveness of using a factory simulator. Received for publication on Oct. 5, 1998; accepted on May 12, 1999     

水泥稳定土厂拌设备生产工艺的探讨

根据目前水稳设备现状 ,结合多年施工实际及目前本行业状况 ,对水稳站的主要生产工艺加以探讨     

电子产品制造中静电防护工作的探讨

简要论述静电产生的原理、静电损伤的危害和生产过程中的静电源,从静电防护的技术措施及日常管理两个角度,并结合实际工作经验,讨论电子产品制造中静电防护工作的重点方向及其主要工作内容,并对如何做好静电防护工作进行评述。     

城市轨道交通文化创意产品开发模式探讨

在分析总结国内外城市轨道交通文化创意产业发展情况的基础上,对城市轨道交通文化创意产品类别和特点进行分析,说明城市轨道交通文化创意产品的发展条件和面临的困难,并提出轨道交通文化创意的发展途径及产品开发建议,对其发展及产品开发工作具有重要作用。     

Study on DSM-based task planning of product cooperative development

The results of analyzing the managerial characteristics and complexity of product cooperative development suggest that task planning is an important aspect for process management of product cooperative development and the method for planning tasks should be able to model the dependency between tasks and iterations during the development process. In this paper, a DSM-based method and its corresponding optimization algorithms are developed. At first the coupled task sets and uncoupled task sets are identified, and the tasks are then optimized by the corresponding algorithms. The optimal tasks plan will reduce the development time and cost. Considering the practical requirements in real world, a Multilayer DSM is proposed, and its information communication techniques between DSM and traversing principle are described in details.     

门径管理流程在汽车空调新产品开发中的应用

门径管理流程为企业提供标准化、系统化的项目管理方法。本文在分析国内汽车零部件新产品开发特征及所面临问题的基础上,介绍门径管理方法与形式;并结合国内汽车空调企业新产品开发的实际状况,构建汽车空调新产品开发的门径管理流程。     

构建适合客车产品全生命周期管理的产品结构

简要论述构建适合客车行业产品全生命周期管理的产品结构的方法,并简要介绍其在销售、生产、成本管理和售后服务等环节发挥的作用。     

Key technology of ship product data exchange based on STEP

In this paper, in order to implement the share and exchange of the ship product data, a new kind of global function model is established. By researching on the development and trend of the application of ship STEP （ standard for the exchange of product model data） standards, the AIM （application interpreted model） of AP216 is developed and improved as an example, aiming at the characteristics and practical engineering of ship industry in our country. The data exchange interfaces are formed based on STEP in the CAD/CAM for the ship by all function modules and shared databases under the global function model. The share and exchange of all information and data are solved in the design, manufacture and all life-cycle of ship products among different computer application systems. The research work makes foundation for the ship industry informatization.     

面向智能制造的船舶小组立中间产品工艺路线

针对传统的船舶小组立制造工艺路线,简述小组立中间产品概念,提出小组立工艺路线智能化改进的原则和方法,构建小组立智能生产线.重点阐述小组立智能生产线各工位的功能及作业流程,详细解析小组立智能生产线的关键技术,为提高船舶小组立制造的效率和质量提供有效支撑.     

博弈系统中任意随机变量序列关于乘积分布的一类强极限定理

引进似然比作为任意随机变量序列相对于服从二项分布的独立随机变量序列偏差的一种度量,并通过限制似然比给出了样本空间的一个子集,在此子集上得到了博弈系统中任意随机变量序列关于乘积二项分布的一类强极限定理,作为推论得到了博弈系统中服从二项分布的独立随机变量序列的一族强大数定理。