A web-based advisory system for process and material selection in concurrent product design for a manufacturing environment

This paper reports the work of selecting suitable manufacturing processes and materials in concurrent design for manufacturing environment. In the paper, a fuzzy knowledge-based decision support method is proposed for multi-criteria decision-making in evaluating and selecting possible manufacturing process/material combinations in terms of the total production cost. Based on the proposed method, a prototype Web-based knowledge-intensive manufacturing consulting service system (WebMCSS) with the client-knowledge server architecture is developed to help designers/users find good processes and materials while still at the conceptual level of design. The system, as one of the important parts of an advanced design for manufacturing tool, is a concept level process and material selection tool that can be used as both a standalone application and a Java applet freely available via the Web. Interlinked with Web pages of tutorials, and reference pages explaining the facets, fabrication processes and material choices, the system performs reasoning and calculations using the process capability and material property data from the remote Web-based database and knowledge base that can be maintained and updated via the Internet. The use of the system is illustrated with an example.     

产品服务系统设计方法研究的总结和探讨

面向服务的设计和制造是当今制造业发展的重要趋势,制造企业围绕已有产品开发产品和服务:融合的整体解决方案即产品服务系统,已成为提升竞争力、满足顾客价值需求的重要策略。为探讨产品服务系统设计方法未来研究方向,从设计过程、需求建模、方案建模以及设计过程决策技术四个方面综述了现有设计方法在国内外研究的现状,探讨了顾客价值理论、方案信息建模、网络映射以及妥协评价等方法在产品服务系统设计中的应用,为产品服务系统设计方法的进一步研究奠定了基础。     

基于WSR系统方法论的产品设计研究

WSR系统方法论是具备东方传统的系统方法论,其独特性在于注重人理,与产品人性化设计思想不谋而合.通过对WSR系统方法论的背景、内容和研究现状的论述,指出该方法论应用于产品设计的意义,构建了产品设计的WSR三维分析模型,提出了基于物理、事理、人理有机协调下的产品设计过程模型.最后,以单柱式液压机的改良设计为例进行了WSR系统方法论的应用分析.     

A digraph-based expert system for non-traditional machining processes selection

The presence of a number of available non-traditional machining (NTM) processes has brought out the idea of selecting the most suitable NTM process for generating a desired shape feature on a given work material. This paper presents a digraph-based approach to ease out the appropriate NTM process selection problem. It includes the design and development of an expert system that can automate this decision-making process with the help of graphical user interface and visual aids. The proposed approach employs the use of pair-wise comparison matrices to calculate the relative importance of different attributes affecting the NTM process selection decision. Based on the characteristics and capabilities of the available NTM processes to machine the required shape feature on a given work material, the permanent values of the matrices related to those processes are computed. Finally, if some of the NTM processes satisfy a certain threshold value, those are shortlisted as the acceptable processes for the given shape feature and work material combination. The digraph-based expert system not only segregates the accepted NTM processes from the list of the available processes but also ranks them in decreasing order of preference. It also helps the user as a responsible guide to select the most suitable NTM process by incorporating all the possible error trapping mechanisms. This paper takes into account some new work materials, shape features and NTM processes that have not been considered by the earlier researchers. It is further observed that the developed expert system is quite flexible and versatile as the results of the cited examples totally corroborate with those obtained by the past researchers.     

基于现代设计方法学的专家系统构造技术

在分析了现有专家系统不足的基础上,提出了基于现代设计方法学的专家系统构造技术,并利用该技术设计出塔式起重机安全评判的专家系统。     

平行分度凸轮机构设计专家系统的开发及三维运动仿真

基于对AtuoCAD与Pro/E的二次开发及综合运用,开发了平行分度凸轮机构的设计专家系统,并实现了运动仿真.该系统给出了界面友好的参数输入对话框,能够完成机构参数的自动综合和凸轮轮廓的自动生成,实现了直接在Pro/E环境下进行仿真.该系统具有直观性、可靠性和易于调整,提高了机构产品的设计质量及效率.     

滚动轴承专家系统设计

滚动轴承是现代机器中广泛应用的标准件之一，常用的滚动轴承绝大多数已经标准化，并由专门的工厂大量生产。这里介绍了如何使用滚动轴承专家来选择、校验轴承，并进行优化设计。     

Development of decision support system for fastener selection in product recovery oriented design

Among the important strategies in sustainable product development is by maintaining product recovery and prolonging product life which are highly dependent on the ease of disassembly. When considering the design for disassembly, there are many fastener-associated factors to be considered such as structural, disassembly process and the pre-disassembly process. There are very few designs for disassembly methods that support the selection of fasteners for design for disassembly (DfD) concepts. Most of the tools developed are more applicable during later stages of the design process when more product information is available. The process of selecting a fastener for its functional characteristics itself is often vague. Additionally, the requirements for disassemblability further complicate the process. This paper proposes the development of a multi-criteria decision making model to assist designers in selecting fasteners for DfD. PROMETHEE was used to build a decision-making model to help the designers in selecting the fasteners that could perform their intended functions with ease of disassembly. A design case study is described to reflect the usefulness of the fasteners selection model.     

A visualization system for integrating maintainability design and evaluation at product design stage

Thoughtful consideration of products maintenance features early in design stage can reduce or eliminate maintenance costs, reduce downtime, and improve safety. As such, the effective collaboration of product designers and maintenance technicians throughout the product design process is becoming much more important for the most advanced competitiveness. To address this need, a visualization system that enables maintainability-related technicians cooperated with product designers in a networked manufacturing environment is proposed in this study. This paper presents a systematic approach to implementation of a Web-based visualization system by using virtual reality technology. The system aims at providing a simulated environment and concurrent engineering processes to facilitate communication, coordination, control, and integration of product maintainability validation and improvement activities. The result of this research will help increase product maintainability, reduce development cycle time and cost, and hence increase product marketability.     

滚动轴承专家系统设计

滚动轴承是现代机器中广泛应用的部件之一,常用的滚动轴承绝大多数已经标准化,并由专门的工厂大量生产.这里介绍了如何使用滚动轴承专家来选择、校验轴承,并进行优化设计.     

一种轻体建筑材料生产线的气动系统设计

轻体建筑材料是高层建筑中取代砖的一种新型材料。它具有质轻、牢固、防震、保温、隔声等优点,并且易于施工,效率高。国外早已应用。如今房地产已成为我国国民经济支柱产业之一,这种材料应用前景十分广阔。我们自行设计的这种气动系统生产线具有自动化程度高、结构紧凑...     

机械设计中的材料设计方法问题

本文提出机械设计中的材料设计方法问题,认为传统机械设计方法中有关机械零部件“材料选择设计”的方法应加以改进;以实例分析,阐述了机械设计中常见的材料设计问题;鉴于工业设计方法学的新进展提出了材料设计的新的功能和系统论设计思想方法;并建议建立基于Ｉｎｔｅｒｎｅｔ的机械设计材料库。     

A novel robot arm selection methodology based on axiomatic design principles

Many companies intend to utilize the robotic systems to improve the performance of their manufacturing systems. Since the robotic systems are complex, it is required to determine the most suitable robot arm at the beginning of the complete design process. However, due to the increase in the number of robot arm alternatives and existence of the multiple and conflicting criteria, it has become hard to the decision makers to select the appropriate robot arm for a production system. Although the traditional multiple criteria of decision-making techniques were heavily employed in the past for this problem, they were based on subjective judgments for both the alternatives and the criteria. Therefore, a methodology based on Axiomatic Design principles is proposed to help the decision maker decide the most appropriate robot arm on a scientific, systematic, and objective basis. Moreover, the proposed methodology is extended into a decision support system (DSS) through MATLAB software, to evaluate more alternatives rapidly. Both the proposed methodology and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) were applied to solve a small problem, so that the techniques will be compared and the utility of the proposed approach will be revealed. Besides, the proposed DSS was applied to a real robot arm selection problem of a food manufacturing system to show its performance in evaluating several alternatives and choosing the most suitable one in an objective and quick manner.     

海水淡化用蝶阀的结构设计及材料选用

介绍了海水淡化的主要工艺方法。根据不同的淡化工艺及其系统对阀门的特殊要求,给出了低温多效蒸馏法（MED）淡化工艺用蝶阀的结构形式和蝶板材料的选择方法。     

电镀立方氮化硼砂轮磨削超深小孔

电镀立方氮化硼砂轮在高精度、低表面粗糙度值的超深小孔磨削中,可大幅提高砂轮轴刚度,从而提高加工质量和生产效率,获得较好的技术经济效果,具有广泛的应用前景.     

结构设计专家系统的研究与实现

本文探讨了如何利用专家系统解决类似数控龙门铣床变速箱这样复杂的结构设计问题。针对不同的知识信息，采用了面向对象的知识表达方式，研究了结构设计类型专家系统中的推理策略。     

Development of an expert system for cold forging of axisymmetric product

This paper deals with an automated computer-aided process planning and die design system by which the designer can determine operation sequences even if they have little experience in process planning and die design for axisymmetric products. An attempt is made to link programs incorporating a number of expert design rules with the process variables obtained by commercial FEM softwares, DEFORM and ANSYS, to form a useful package. The system is composed of four main modules. The process planning and the die design modules consider several factors, such as the complexities of preform geometry, punch and die profiles, specifications of available multi-former, and the availability of standard parts. They can provide a flexible process based on either the reduction in the number of forming sequences by combining the possible two processes in sequence, or the reduction of deviation of the distribution on the level of the required forming loads by controlling the forming ratios. In the die design module optimal design technique and the horizontal split of the die insert were investigated for determining appropriate dimensions of components of the multi-former die set. It is suggested that the proposed method can be beneficial for improving the tool life of the die set in practice.     

一种基于产品服务系统的产品设汁方法

针对资源紧缺和环境污染问题国外学者近年提出了产品服务系统(Product Service System,PSS)的概念.分析了PSS研究及应用情况,指出了PSS下产品设计缺乏规范性解决策略的问题.在总结了PSS的特征之后,从TRIZ理想化出发得出具有PSS特征的产品理想化水平的表达公式,用以定性评估PSS下产品理想化水平.并根据这些特征提出了一种将顾客需求转化为PSS下的特定问题的流程.最后,以一个设计实例验证了该设计流程的可行性.