Computer-aided block assembly process planning based on rule-reasoning are developed in order to improve the assembly efficiency and implement the automated block assembly process planning generation in shipbuilding. ...Computer-aided block assembly process planning based on rule-reasoning are developed in order to improve the assembly efficiency and implement the automated block assembly process planning generation in shipbuilding. First, weighted directed liaison graph （WDLG） is proposed to represent the model of block assembly process according to the characteristics of assembly relation, and edge list （EL） is used to describe assembly sequences. Shapes and assembly attributes of block parts are analyzed to determine the assembly position and matched parts of parts used frequently. Then, a series of assembly rules are generalized, and assembly sequences for block are obtained by means of rule reasoning. Final, a prototype system of computer-aided block assembly process planning is built. The system has been tested on actual block, and the results were found to be quite efficiency. Meanwhile, the fundament for the automation of block assembly process generation and integration with other systems is established.展开更多
Computer aided process planning system played a key role for integrating design and manufacturing or assembly systems properly considering available resources and design constraints.To take advantage of the enterprise...Computer aided process planning system played a key role for integrating design and manufacturing or assembly systems properly considering available resources and design constraints.To take advantage of the enterprise resource,the web CAPP framework was established.Case based reasoning and multi agent system were integrated in the system.The multi agent mecha- nism was discussed in the paper.And an instance of case base was introduced.They made the system run independently and contin- uously in the network environment of process planning problems.展开更多
Compared with general machining processes,additive manufacturing(AM) process has stabler planning route and limited process variables and this makes it to be more easily designed and planned with knowledge based syste...Compared with general machining processes,additive manufacturing(AM) process has stabler planning route and limited process variables and this makes it to be more easily designed and planned with knowledge based systems and computer aided techniques.Case based reasoning approach is applied to the process planning of additive manufacturing in this paper.The concept of "AM process relevant design features" is proposed after the analysis of the characteristics of AM processes.The concept is used as the basis of the knowledge representation,and AM relevant feature graph is used as the case representation schema.The case retrieval method is discussed based on this graph.The case representation of a machine arm is given to illustrate the brief process of the proposed approach.展开更多
The techniques for automatic generation of CAD interface for process planning are investigated. This paper proposes an approach of determining the optimal rectangular stock for a prismatic part, and then grows the CAD...The techniques for automatic generation of CAD interface for process planning are investigated. This paper proposes an approach of determining the optimal rectangular stock for a prismatic part, and then grows the CAD module backwardly to its stock. It also presents some of the work done in implementing a powerful machining planning as a functional part of an open architecture system for process planning called OSCAP.展开更多
提出了智能化CAPP(computer aided process planning)中工艺决策模块的构造方法及知识库与推理机的实现。工艺决策模块使用OPS(official production system)作为专家系统工具,把基于规则的知识表示语言与过程语言结合起来,使过程化知识...提出了智能化CAPP(computer aided process planning)中工艺决策模块的构造方法及知识库与推理机的实现。工艺决策模块使用OPS(official production system)作为专家系统工具,把基于规则的知识表示语言与过程语言结合起来,使过程化知识的规则表示变得容易,进而通过使用产生式规则构建知识库,采用演绎推理式的推理机,实现了一系列的工艺决策。展开更多
基金National Natural Science Foundation of China (No.40606018)
文摘Computer-aided block assembly process planning based on rule-reasoning are developed in order to improve the assembly efficiency and implement the automated block assembly process planning generation in shipbuilding. First, weighted directed liaison graph （WDLG） is proposed to represent the model of block assembly process according to the characteristics of assembly relation, and edge list （EL） is used to describe assembly sequences. Shapes and assembly attributes of block parts are analyzed to determine the assembly position and matched parts of parts used frequently. Then, a series of assembly rules are generalized, and assembly sequences for block are obtained by means of rule reasoning. Final, a prototype system of computer-aided block assembly process planning is built. The system has been tested on actual block, and the results were found to be quite efficiency. Meanwhile, the fundament for the automation of block assembly process generation and integration with other systems is established.
文摘Computer aided process planning system played a key role for integrating design and manufacturing or assembly systems properly considering available resources and design constraints.To take advantage of the enterprise resource,the web CAPP framework was established.Case based reasoning and multi agent system were integrated in the system.The multi agent mecha- nism was discussed in the paper.And an instance of case base was introduced.They made the system run independently and contin- uously in the network environment of process planning problems.
文摘Compared with general machining processes,additive manufacturing(AM) process has stabler planning route and limited process variables and this makes it to be more easily designed and planned with knowledge based systems and computer aided techniques.Case based reasoning approach is applied to the process planning of additive manufacturing in this paper.The concept of "AM process relevant design features" is proposed after the analysis of the characteristics of AM processes.The concept is used as the basis of the knowledge representation,and AM relevant feature graph is used as the case representation schema.The case retrieval method is discussed based on this graph.The case representation of a machine arm is given to illustrate the brief process of the proposed approach.
文摘The techniques for automatic generation of CAD interface for process planning are investigated. This paper proposes an approach of determining the optimal rectangular stock for a prismatic part, and then grows the CAD module backwardly to its stock. It also presents some of the work done in implementing a powerful machining planning as a functional part of an open architecture system for process planning called OSCAP.
文摘提出了智能化CAPP(computer aided process planning)中工艺决策模块的构造方法及知识库与推理机的实现。工艺决策模块使用OPS(official production system)作为专家系统工具,把基于规则的知识表示语言与过程语言结合起来,使过程化知识的规则表示变得容易,进而通过使用产生式规则构建知识库,采用演绎推理式的推理机,实现了一系列的工艺决策。
