计算机辅助统计过程控制(CA-SPC)是提高过程管理水平和质量的重要手段。在对CA-SPC进行需求分析与确定的基础上,进一步对用 MS EXCEL 2000来实现 CA－SPC的技术可行性进行了深入研究,并指出其优越性。描述了基于 MS EXCEL 2000的 CA－SP...计算机辅助统计过程控制(CA-SPC)是提高过程管理水平和质量的重要手段。在对CA-SPC进行需求分析与确定的基础上,进一步对用 MS EXCEL 2000来实现 CA－SPC的技术可行性进行了深入研究,并指出其优越性。描述了基于 MS EXCEL 2000的 CA－SPC系统功能结构,对应用流程进行了研究,对实现过程中的关键技术进行了说明。通过实际应用,实现了对生产过程质量状况进行分析、监控,并自动生成报表的功能。展开更多
Computer aided design on the Internet/Intranet explores new frontiers in design environment. A new Web based CAD system is introduced. The users can install the CAD system on the server to build three dimensional m...Computer aided design on the Internet/Intranet explores new frontiers in design environment. A new Web based CAD system is introduced. The users can install the CAD system on the server to build three dimensional models of products through a Web browser in any operation systems. No system installation and system maintenance are required. A new architecture and the database of system are discussed. The UML models of the system are presented. The proposed organization is implemented on the World Wide Web using Java and CORBA.展开更多
国民收入是一个综合性经济指标。按照美国著名资产阶级经济学家萨缪尔逊的说法,有其广义的概念和狭义的概念。所谓广义的国民收入,是指国民生产总值、国民生产净值、国民收入、个人收入和个人可支配收入这五个总量指标所构成的一个指标...国民收入是一个综合性经济指标。按照美国著名资产阶级经济学家萨缪尔逊的说法,有其广义的概念和狭义的概念。所谓广义的国民收入,是指国民生产总值、国民生产净值、国民收入、个人收入和个人可支配收入这五个总量指标所构成的一个指标体系;所谓狭义的国民收入,则是指其中的国民收入。广义国民收入的五个总量指标,借助于复式会计帐户的形式,把它们之间的内在联系表述出来,这就是国民收入核算体系。在美国,这个体系称作“国民收入和生产核算体系”(National Ineome and Product Accounts)。展开更多
The necessity and feasibility of an expert system for carbide-tool utilization are analyzed and a practical system named CUES(carbide-tool utilization expert system ) is developed and realized. The system concept, mod...The necessity and feasibility of an expert system for carbide-tool utilization are analyzed and a practical system named CUES(carbide-tool utilization expert system ) is developed and realized. The system concept, module structure, data management, inference strategy and the interface design of the system are discussed in.detail. The system would be useful not only for the preparation of tool bank of FMS or CIMS, but the for the proper application of cemented carbide tools in conventional machining Processes.展开更多
A system architecture of solid-based NC simulation for milling machining is given, the function of which is composed of cutting simulation of different cutters, such as flat-end cutters, ball-end cutters, dome-end cut...A system architecture of solid-based NC simulation for milling machining is given, the function of which is composed of cutting simulation of different cutters, such as flat-end cutters, ball-end cutters, dome-end cutters, angle cutters and drill cutters, rapid pre-checking of interference, detection of collision, and visualization of over cut in the stock. A new method based on the design model is raised to detect the collision and pre-check the interference during NC milling machining. A special problem about the construction of a cutter′s swept volume, self-intersection is discussed. All the work on the construction, the subtraction and the display of solids is accomplished with the help of ACIS 3-D modeling.展开更多
An approach to feature-based parametric design for die and mould is proposed in this paper.The assembly relationship and parts of the die and mould are described by feature.The dependent relationship of features is de...An approach to feature-based parametric design for die and mould is proposed in this paper.The assembly relationship and parts of the die and mould are described by feature.The dependent relationship of features is described by parent-child operator structure.The feature shape and location can be modified by design parameters.An expert system is used for deriving a geometry of the features which satisfies the given constraints.This approach provides a more natural and convenient method of representing a parametric model of the die and mould.展开更多
The advent of rapid prototyping & manufacturing techniques represents a major breakthrough in production engineering. This paper is concerned with the software system aspects of the selective laser sintering (SL...The advent of rapid prototyping & manufacturing techniques represents a major breakthrough in production engineering. This paper is concerned with the software system aspects of the selective laser sintering (SLS),i.e.the issues that deal with an external geometric CAD model to automatically control the physical layering fabrication process as directly as possible ,regardless of the source of the model. The general issues are described and some key methods are given in this paper.展开更多
The amount of material must be removed away to produce the final product should minimize, excess stock will increase not only the material cost, but also processing cost, fixture cost, tooling cost, and increases mach...The amount of material must be removed away to produce the final product should minimize, excess stock will increase not only the material cost, but also processing cost, fixture cost, tooling cost, and increases machine cycle times. Noticing in recent years that the world is running out of mineral resources, and the price of engineering materials will continually rise in the future, the percentage of the cost of manufactured part that is due to the cost of materials is also rising. This paper proposed a variant CAPP system for rotational parts based on the concept of group technology, this system accepts part features characteristics code number as an input and provides operation details for manufacturing route with the suitable primary processes required to produce the blank work piece as an output.展开更多
Simulation and optimization are the key points of virtual product development (VPD). Traditional engineering simulation software and optimization methods are inadequate to analyze the optimization problems because of ...Simulation and optimization are the key points of virtual product development (VPD). Traditional engineering simulation software and optimization methods are inadequate to analyze the optimization problems because of its computational inefficiency. A systematic design optimization strategy by using statistical methods and mathematical optimization technologies is proposed. This method extends the design of experiments (DOE) and the simulation metamodel technologies. Metamodels are built to in place of detailed simulation codes based on effectively DOE, and then be linked to optimization routines for fast analysis, or serve as a bridge for integrating simulation software across different domains. A design optimization of composite material structure is used to demonstrate the newly introduced methodology.展开更多
Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was...Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was developed. Basic software systems for modeling, modifying, and assembly simulation were developed. The system has good compatibility, and models created by it can be saved in different 3-D file formats, and 2D engineering drawings can be output directly. The model can be modified dynamically, overcoming the necessity of repeated modifications during hull structural design. Through operations such as model construction, intervention inspection, and collision detection, problems can be identified and modified during the hull structural design stage. Technologies for centralized control of the system, database management, and 3-D digital design are integrated into this digital model in the preliminary design stage of shipbuilding.展开更多
文摘计算机辅助统计过程控制(CA-SPC)是提高过程管理水平和质量的重要手段。在对CA-SPC进行需求分析与确定的基础上,进一步对用 MS EXCEL 2000来实现 CA－SPC的技术可行性进行了深入研究,并指出其优越性。描述了基于 MS EXCEL 2000的 CA－SPC系统功能结构,对应用流程进行了研究,对实现过程中的关键技术进行了说明。通过实际应用,实现了对生产过程质量状况进行分析、监控,并自动生成报表的功能。
文摘Computer aided design on the Internet/Intranet explores new frontiers in design environment. A new Web based CAD system is introduced. The users can install the CAD system on the server to build three dimensional models of products through a Web browser in any operation systems. No system installation and system maintenance are required. A new architecture and the database of system are discussed. The UML models of the system are presented. The proposed organization is implemented on the World Wide Web using Java and CORBA.
文摘国民收入是一个综合性经济指标。按照美国著名资产阶级经济学家萨缪尔逊的说法,有其广义的概念和狭义的概念。所谓广义的国民收入,是指国民生产总值、国民生产净值、国民收入、个人收入和个人可支配收入这五个总量指标所构成的一个指标体系;所谓狭义的国民收入,则是指其中的国民收入。广义国民收入的五个总量指标,借助于复式会计帐户的形式,把它们之间的内在联系表述出来,这就是国民收入核算体系。在美国,这个体系称作“国民收入和生产核算体系”(National Ineome and Product Accounts)。
文摘The necessity and feasibility of an expert system for carbide-tool utilization are analyzed and a practical system named CUES(carbide-tool utilization expert system ) is developed and realized. The system concept, module structure, data management, inference strategy and the interface design of the system are discussed in.detail. The system would be useful not only for the preparation of tool bank of FMS or CIMS, but the for the proper application of cemented carbide tools in conventional machining Processes.
文摘A system architecture of solid-based NC simulation for milling machining is given, the function of which is composed of cutting simulation of different cutters, such as flat-end cutters, ball-end cutters, dome-end cutters, angle cutters and drill cutters, rapid pre-checking of interference, detection of collision, and visualization of over cut in the stock. A new method based on the design model is raised to detect the collision and pre-check the interference during NC milling machining. A special problem about the construction of a cutter′s swept volume, self-intersection is discussed. All the work on the construction, the subtraction and the display of solids is accomplished with the help of ACIS 3-D modeling.
文摘An approach to feature-based parametric design for die and mould is proposed in this paper.The assembly relationship and parts of the die and mould are described by feature.The dependent relationship of features is described by parent-child operator structure.The feature shape and location can be modified by design parameters.An expert system is used for deriving a geometry of the features which satisfies the given constraints.This approach provides a more natural and convenient method of representing a parametric model of the die and mould.
文摘The advent of rapid prototyping & manufacturing techniques represents a major breakthrough in production engineering. This paper is concerned with the software system aspects of the selective laser sintering (SLS),i.e.the issues that deal with an external geometric CAD model to automatically control the physical layering fabrication process as directly as possible ,regardless of the source of the model. The general issues are described and some key methods are given in this paper.
文摘The amount of material must be removed away to produce the final product should minimize, excess stock will increase not only the material cost, but also processing cost, fixture cost, tooling cost, and increases machine cycle times. Noticing in recent years that the world is running out of mineral resources, and the price of engineering materials will continually rise in the future, the percentage of the cost of manufactured part that is due to the cost of materials is also rising. This paper proposed a variant CAPP system for rotational parts based on the concept of group technology, this system accepts part features characteristics code number as an input and provides operation details for manufacturing route with the suitable primary processes required to produce the blank work piece as an output.
文摘Simulation and optimization are the key points of virtual product development (VPD). Traditional engineering simulation software and optimization methods are inadequate to analyze the optimization problems because of its computational inefficiency. A systematic design optimization strategy by using statistical methods and mathematical optimization technologies is proposed. This method extends the design of experiments (DOE) and the simulation metamodel technologies. Metamodels are built to in place of detailed simulation codes based on effectively DOE, and then be linked to optimization routines for fast analysis, or serve as a bridge for integrating simulation software across different domains. A design optimization of composite material structure is used to demonstrate the newly introduced methodology.
文摘Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was developed. Basic software systems for modeling, modifying, and assembly simulation were developed. The system has good compatibility, and models created by it can be saved in different 3-D file formats, and 2D engineering drawings can be output directly. The model can be modified dynamically, overcoming the necessity of repeated modifications during hull structural design. Through operations such as model construction, intervention inspection, and collision detection, problems can be identified and modified during the hull structural design stage. Technologies for centralized control of the system, database management, and 3-D digital design are integrated into this digital model in the preliminary design stage of shipbuilding.
