基于实例推理的模具设计技术研究

模具设计需要大量借鉴以往的设计方案。对设计经验的合理组织和重用可以缩短模具设计周期,提高模具设计效率。文章介绍了一种基于实例推理技术的模具设计方法:通过状态空间法表示了设计实例;阐述了基于相似度理论的最近邻居算法检索策略,能够对实例库中的实例进行检索。并以凸模零件为例对所讲述的方法及技术进行了说明,结果表明实例推理技术的应用可以提高模具的设计效率。     

基于实例推理的电机模具设计

结合某企业电动机典型零件的模具设计，将实例设计的设计思想用于电机模具设计，同时通过对基于实例推理的分析，成功实现了基于相似实例的模具CAD系统，经实际应用，效果显著。     

基于神经网络的注塑模KBE系统开发

针对现有注塑模具设计CAD系统存在的缺点，提出基于神经网络的注塑模KBE系统开发思想。阐述了模具设计的特点、KBE的内涵和特点以及神经网络的原理和在模具设计KBE上的应用，设计了基于神经网络的摩托车塑件模具设计KBE的基本系统框架，并分配了模具设计KBE系统中神经网络算法的榆入、输出以及隐层各神经元，为注塑模具设计KBE提供了系统构造基础研究。     

综采装备三机配套概念设计系统

针对现有综采装备智能设计方法大多未考虑三机配套设计参数之间的复杂耦合关系,导致系统的适用性较差、设计知识孤立等问题,研究了基于知识推理的综采装备概念设计方法和综采装备三机配套原则,将实例推理、规则推理和模型推理的混合推理机制应用于综采装备三机配套的概念设计中,建立了基于知识推理的综采装备三机配套概念设计推理模型,开发了基于知识推理的综采装备三机配套概念设计系统。该系统利用知识推理方法对用户输入的初始参数进行实例推理,并在实例库中检索相似实例,得到符合要求的设计方案;如没有相似实例,则进行模型推理完成三机配套参数设计,得到参数设计方案。应用实例表明,该系统设计结果准确、推理速度快,实现了综采装备的智能设计,缩短了产品设计周期。     

一种基于分形的创新概念设计系统的实现

改进了以往采用数学函数生成初始构件的概念设计过程，提出了一种基于分形的交互式创新概念设计系统的实现方法。给出了一个建筑造型创新设计实例：初始化种群先经分形化的嵌套、拟态等操作再进化计算，使生成的建筑体具有分形自相似的特征。实验表明，分形在创新进化系统中有很好的应用前景。     

并行技术在注塑模CAD／CAM／CAE中的应用

传统的注塑模设计方法，是基于一种串行处理方法。需要较长的设计时间，这一过程耗时、效率低，不能适应生产迅速发展的需要。本文提出了基于并行技术的模具设计，使得ＣＡＤ／ＣＡＭ／ＣＡＥ系统内部达到以数据共享为基础的高度集成。还提出以同步工程原理管理注塑模新产品开发过程，充分体现了工程技术人员的思维方式及其产品设计过程的反复性和协调性。     

并行技术在注塑模CAD／CAM／CAE中的应用

传统的注塑模设计方法，是基于一种串行处理方法。需要较长的设计时间，这一过程耗时，效率低，不能适应生产迅速发展的需要。本文提出了基于并行技术的模具设计，使得ＣＡＤ／ＣＡＭ／ＣＡＥ系统内部达到以数据共享为基础的高度集成。还提出以同步工程原理管理注塑模新产品开发过程，充分体现了工程技术人员的思维广度芨其产品设计过程的反复性和协调性。     

一种基于隶属函数的相似度计算方法及其应用*

针对在模糊实例检索中传统的基于距离函数相似度算法的复杂性和不精确性等缺点,通过分析隶属函数提出了基于隶属函数的相似度计算方法。该方法根据不同类型的检索需求,构建了针对模糊数字型需求和模糊语义型需求的相似度计算模型;同时考虑了属性权重问题,采用基于相似度离差信息的客观赋权方法将主观权重和客观权重加以组合,以组合权重来计算实例的全局相似度。以汽车发动机的概念设计为例,验证了基于隶属函数的相似度计算方法能对不同类型的需求实现快速而有效的实例检索。     

注塑模计算机辅助分析系统的开发

本文简要介绍了一个注塑模计算机辅助分析系统的组成、功能及主要技术原理。利用该系统，可模拟产品设计、模具设计及成型条件对产品的影响，减少试模次数，提高产品质量。     

基于设计特征的概念设计解产生及其评价

将设计特征引入概念设计阶段,对概念设计阶段设计特征的内涵进行了界定。按功能抽象方式给出了设计特征编码系统的一种组成,以此建立设计特征库。随后给出了基于设计特征的概念设计方案生成方法及方案评价方法,并用实例验证了方法的有效性。     

概念设计中基于笔式手势的交互计算研究

基于笔式手势的自然交互是支持概念设计创新的有效方式.提出了一种笔式手势的层次概念模型,结合基于约束的自由勾画和上下文感知技术描述了手势设计方式,进一步讨论了手势内部的约束建立和求解算法;基于手势应用的范式,给出了概念设计中特征手势建模的应用实例,通过与传统建模和交互方式的对比,验证了特征手势建模的方便性.给出一个自然、高效的方法,以基于手势的方式来完成概念设计构思过程,采用笔式交互快速自然地记录下设计思路,所实现的系统方便了用户的创新设计,改善了人机交互模式.     

基于CAD的注塑模具设计与仿真研究

研究了基于CAD技术的注塑模具设计流程,并对模具的工艺参数进行了分析和优化,具体采用CAD注塑模集成系统实现。完成了最优工艺参数方案的确定,通过UG的CAE分析模块的应用并以模拟结果为依据完成了对注塑件应力应变分布情况的分析,应力最大值及位置通过实验对比完成确定,为模具结构的优化方案提供参考。最佳注塑制品工艺参数通过分析相关工艺参数获取,并以音箱零件为例,对注塑模具型腔设计方法进行了探讨。     

Research on quality performance conceptual design based on SPEA2+

In order to solve the multi-objective performance optimal problems, SPEA2+ is used to realize the performance design of injection molding machine. The optimization objectives are constructed to maximize mould control power, maximize injection quantity and minimize injection power. The mathematical model is found to optimize the problem. A solution is extracted to eliminate the imprecise nature of preference through the Pareto optimal set based on fuzzy set theory. Compared with NSGA-II and SPEA2, SPEA2+ could acquire the Pareto front with better distribution and smaller distance with the optimum solutions. Finally, the case illustration of HTG1000X3Y injection molding machine is taken as an example to demonstrate that such method is effective and practical. Effective references could be provided to decision makers for objectives tradeoff at the performance conceptual design stage of injection molding machine.     

An object-oriented approach to computer-aided design of a plastic injection mould

This paper describes a knowledge-based and object-oriented approach for the design of the feed system for plastic injection moulds. The gating system of a plastic injection mould plays a significant role in producing a quality part. Designing of this gating system entails a great amount of effort from an experienced designer and it is time-consuming. CADFEED (Computer-Aided Design of the FEED system of the plastic injection mould) is developed to accurately and efficiently design the type, location and size of a gating system of a plastic injection mould. This system provides an accurate and fast means of obtaining solutions based on the users' requirements, which are easily handled by the rating algorithm in the system. CADFEED generates acceptable solutions at a lower cost than most traditionally and commercially available analysis packages. This system can be used to verify designs proposed by the design engineers. It can also help novice engineers in the understanding of mould design. Another important feature of CADFEED is that it is a low cost system, which uses AutoCAD and an expert system shell on a personal computer. This feature makes CADFEED easily affordable by small-scale industries.     

关于ASP网站设计安全性探讨

网络上的动态网站以SP1注入为多数,学校的网站也是SP1注入的。学校网站的制作和维护人员,与SP1注入攻击的各种现象斗争了多次,也对网站进行了一次次的修补,根据工作经验,就SP1注入网站设计常见安全漏洞及其防范进行一些探讨。结合SP1注入动态网站开发经验,对SP1注入程序设计存在的信息安全隐患进行分析,讨论了SP1注入程序常见的安全漏洞,从程序设计角度对WEB信息安全及防范提供了参考。     

Case-based retrieval of 3-dimensional shapes for the design of metal castings

This paper describes research into retrieval based on 3-dimensional shapes for use in the metal casting industry. The purpose of the system is to advise a casting engineer on the design aspects of a new casting by reference to similar castings which have been prototyped and tested in the past. The key aspects of the system are the orientation of the shape within the mould, the positions of feeders and chills, and particular advice concerning special problems and solutions, and possible redesign. The main focus of this research is the effectiveness of similarity measures based on 3-dimensional shapes. The approach adopted here is to construct similarity measures based on a graphical representation deriving from a shape decomposition used extensively by experienced casting design engineers. The paper explains the graphical representation and discusses similarity measures based on it. Performance measures for the CBR system are given, and the results for trials of the system are presented. The competence of the current case-base is discussed, with reference to a representation of cases as points in an n-dimensional feature space, and its principal components visualization. A refinement of the case base is performed as a result of the competence analysis and the performance of the case-base before and after refinement is compared.     

Internet Based Collaborative Product Conceptual Design

Generation of Product Concept needs to give full play to the designers' innovative potential and collaborative work of experts in different fields. However, the collaborative innovative capabilities of geographically distributed designers are often limited and hindered by space and time. Therefore, on the basis of the requirements analysis of Internet based collaborative conceptual design and the research work we have done, this paper proposes the overall framework of supporting collaborative conceptual design on Internet. Based on this overall framework, the authors further put forward collaborative conceptual design process model that includes three stages: concept generation, concept communication and optimal product concept selection. At the end of the paper, the experiment environment of collaborative design is described. The overall framework and collaborative conceptual design process model proposed can take full advantage of Internet and give full play to experts' experiences and wisdom, so that the rapid development and innovative design of product can be provided with effectively and efficiently implemental mode and support on Internet.     

An Internet-based intelligent design system for injection moulds

The rapid growth of Internet and information technologies in recent years provides a solution to support and facilitate collaborative product developments among different geographically distributed enterprises. An effective and feasible tool to aid the collaborative development of injection moulds can be realized by developing an Internet-based mould design system as one of the modules of a collaborative product development system. This paper presents a prototype Internet-based intelligent design system for injection moulds. The architecture of the system consists of an interactive KB mould design system embedded in an Internet environment. A Java-enabled solution together with artificial intelligence techniques is employed to develop such a networked interactive CAD system. In this system, the computational module, the knowledge base module and the graphic module for generating mould features are integrated within an interactive CAD-based framework. The knowledge base of the system would be accessed by mould designers through interactive programs so that their own intelligence and experience could also be incorporated with the total mould design. The approach adopted both speeds up the design process and facilitates design standardization which in turn increases the speed of mould manufacture. A practical case study is presented to illustrate the operations of the Internet-based mould design system.     

Plastic injection mould cooling system design by the configuration space method

The cooling system of an injection mould is very important to the productivity of the injection moulding process and the quality of the moulded part. Despite the various research efforts that have been directed towards the analysis, optimization, and fabrication of cooling systems, support for the layout design of the cooling system has not been well developed. In the layout design phase, a major concern is the feasibility of building the cooling system inside the mould insert without interfering with the other mould components. This paper reports a configuration space (C-space) method to address this important issue. While a high-dimensional C-space is generally required to deal with a complex system such as a cooling system, the special characteristics of cooling system design are exploited in the present study, and special techniques that allow C-space computation and storage in three-dimensional or lower dimension are developed. This new method is an improvement on the heuristic method developed previously by the authors, because the C-space representation enables an automatic layout design system to conduct a more systematic search among all of the feasible designs. A simple genetic algorithm is implemented and integrated with the C-space representation to automatically generate candidate layout designs. Design examples generated by the genetic algorithm are given to demonstrate the feasibility of the method.