基于灰色系统理论的机械产品设计综合评价

将灰关联分析方法应用到机械设计综合评价体系各模块,实现了机械产品设计的综合评价。实例表明,该方法能处理复杂、多层、且信息不完备的问题,是一种比较好的评价方法,为进行产品设计提供了重要保证。     

系统评价指标体系与灰色模糊评价模型构建

针对社会、经济等系统大多是灰色系统,具有明显的层次复杂性、结构关系的模糊性、动态变化的随机性、指标数据的不完全性和不确定性等特点,利用灰色系统理论进行评价系统可以扩大信息源,提高评价结果的可信度。本文对灰色评价的两个关键问题展开研究。一是系统评价指标体系构建,包括指标体系的构成、指标体系结构模型、指标权重的确定、指标值的无量纲化处理、定性指标定量化等内容;二是灰色模糊评价模型构建,按评价指标的层次顺序研究了单指标模糊评价、一级灰色综合评价、多级灰色综合评价。由于灰色系统的普遍存在,本文的研究内容具有广阔的应用前景。     

基于灰色系统理论的商业银行竞争力评价模型

建立了市场占有能力、盈利性等4方面的竞争力评价指标体系,引入灰色系统理论,建立了基于灰色系统理论的商业银行竞争力评价模型,该模型具有如下主要特点：一是构建理想银行。计算被评价银行与理想银行之间的关联度,其关联度大小的排序即银行竞争力强弱的顺序,二是选取典型银行,进行了主成分分析和灰色关联优势分析,通过综合关联度的计算得到各指标对综合得分的影响程度,解决了现有研究中对指标权重确定主观性太强的缺点。     

基于指标结构基因模型的评价驱动型产品设计

针对产品方案设计中用户反馈信息处理、转化问题,提出了交互式产品设计方法,建立了以用户交互式评价为核心的"指标-结构-基因"产品设计模型。该模型应用模糊集与粗糙集理论处理用户评价信息;利用灰色系统理论,应用层次分析法建立评价指标体系,实现由指标体系到产品结构的转换;采用遗传算法,通过产品结构基因编码,根据用户交互式评价,获得产品进化设计方案。以某企业婴儿手推车产品方案设计为例,阐述了应用该方法进行产品方案设计的一般步骤。     

基于灰色理论的CAI课件多级模糊综合评价模型

CAI课件已成为现代化教学的热点,各类学校及有关计算机软件开发商都在关注其制作与开发,而客观合理的评价方法对CAI课件的发展则是十分重要的。通过对CAI课件的影响因素分析,建立了CAI课件的综合评价模型。在求解过程中利用灰色关联分析来确定评价指标的权重,然后运用模糊方法对CAI课件进行综合评价,使得对CAI课件评价更科学、客观。     

基于拟非线性模糊模型的复杂系统模糊辨识

针对一阶Takagi-Sugeno（以下简称T-S）模型辨识复杂系统的困难，本文提出了一种新的拟非线性模糊模型。即在一阶T-S模型的基础上，再进行一次非线性映射。这种模糊模型不仅具有较高的辨识精度，而且具有良好的泛化功能。运用改进的FCM（Fuzzy-C-Means）模糊聚类方法，辨识该模糊模型的结构，与以往的方法比较，极大地简化了结构辨识的复杂性。仿真结果进一步说明了该方法的有效性。     

基于综合赋权灰色关联模型的电网运行安全能力评价模型

为科学合理地评估电网运行安全能力,本文采用等级相关主观赋权法和指标信息量集成客观权重的综合赋权法,综合确定电网运行安全能力评价指标体系最终权重。构建了含有分辨系数的改进灰色关联综合评价模型,对某电网运行6个时期的安全能力进行评价,并与传统的灰色绝对关联度模型进行了对比。对比结果验证了本文模型的有效性和实用性。     

SDPS系统评价方法与模型设计

本文介绍了决策支持系统的有关概念及利用ＤＳＳ进行卫星研制项目管理的必要性,结合管理决策工作的要要,分析了ＳＤＰＳ所实现的功能,给出了ＳＤＰＳ的总体结构,设计了指标了分析的模型和方法。     

非线性延时系统的观测器设计

分析了一类非线性延时系统的观测器设计问题。为了分析非线性函数对观测器设计的影响,提出了一类准单边Lipshitz条件。在准单边Lipschitz条件的基础上,得到了可渐近估计任意状态的延时无关和延时相关的观测器设计充分条件。这些充分条件可描述为线性矩阵不等式的形式。此外,即使非线性延时系统的参数对(A,C)是不可测的,这些充分条件依然是有效的,因为不必正定的准单边Lipschitz矩阵包含了很多非线性部分的有用信息。     

软件工程专业合作企业选择评价系统研究

在软件工程专业校企合作人才培养模式中,企业的综合实力直接决定人才培养的质量。为合作企业建立客观合理的选择综合评价系统,有利于高校从众多参差不齐的企业中遴选出符合自己培养目标的企业。文章在构建合作企业评价指标体系的基础上,针对评价指标体系的特点,提出采用灰色关联分析法建立企业综合评价模型,并通过实例研究,证实该评价模型的实用性和有效性。     

Ergonomics capability in product design and development: an organizational analysis

This paper suggests that the emergence and development of ergonomics capability in product design and development can be understood as a dynamic process of innovation, which is shaped by a combination of forces both internal and external to an organization. The comparative case study method was used to focus on six organizations (three pairs) operating from a manufacturing base in New Zealand. Data were collected from in-depth interviews, documents, archival sources and through observation. A framework for understanding the emergence and development of ergonomics capability in product design and development is presented. While ergonomics capability is a core concept in the model, four other major elements are identified. These are staffing routines, top management orientation, organizational configuration, and the external environment.     

面向复杂装备精密产品质量特性的Kriging-RBDO可靠性优化设计

不确定设计参数情形下的复杂装备柔顺机构精密产品质量特性波动与可靠性疲劳退化是精密微机电系统领域的基础性工程难题.针对这一基础性工程难题,提出一种面向复杂装备柔顺机构精密产品可靠性优化设计模型.利用拉丁超立方试验设计(Latin hypercube design,LHD)构建试验设计组合方案,通过有限元数值模拟获取各试验设计组合方案的质量特性值.据此,采用Kriging代理模型建立质量特性与不确定设计参数之间复杂非线性函数关系模型.在此基础上,引入基于可靠性优化设计(Reliability-based design optimization,RBDO)策略,构建面向复杂装备柔顺机构精密产品Kriging-RBDO可靠性优化设计模型.算例表明,所提出的方法在不确定设计参数情形下的复杂装备柔顺机构精密产品早期质量设计方面具有良好的抗疲劳退化特性.     

Machine learning and CBR integrated mechanical product design approach

Many works based on case-based reasoning (CBR) and rule-based reasoning (RBR) have been done to obtain a product concept intelligently, but researches on automatic and intelligent methods for the detailed design process are still lacking. To achieve the intelligent design of the whole process for mechanical product development, an approach based on cases and knowledge is proposed. First, considering that the actual product cases sample is small, correlations among product features and relationships between product features and requirements are evaluated based on design knowledge. According to these correlations and relationships, a design problem is decomposed into multiple parallel small-scale sub-problems not only to increase data samples but reduce data dimensions. Moreover, a hybrid method that combined Hamming distance with Euclidean distance is generated to retrieve similar cases, which can address both numerical and encoding factors. In addition, K-Nearest-Neighbor (KNN) algorithm and Linear regression are adopted to adapt the classification and numeric parameters, respectively, so that the detailed design process can be achieved without fixed knowledge template. Finally, a tool design software is developed based on Visual studio 2015 to verify the practicability of the proposed method.     

A form verification system for the conceptual design of complex mechanical systems

This paper presents a summary of research into the development and implementation of a domain-independent, computer-based model for the conceptual design of complex mechanical systems [1]. The creation of such a design model includes the integration of four major concepts: (1) the use of a graphical display for visualizing the conceptual design attributes: (2) the proper representation of the complex data and diverse knowledge reguired to design the system; (3) the integration of quality design methods into the conceptual design: (4) the modeling of the conceptual design process as a mapping between functions and forms. Using the design of an automobile as a case study, a design environment was created which consisted of a distributed problem-solving paradigm and a parametric graphical display. The requirements of the design problem with respect to data representation and design processing were evaluated and a process model was specified. The resulting vehicle design system consists of a tight integration between a blackboard system and a parametric design system. The completed system allows a designer to view graphical representations of the candidate conceptual designs that the blackhoard system generates.     

基于KBE与ActiveX的产品参数化设计研究

针对目前尺寸驱动参数化建模方法存在的不足,提出了程序外驱动参数化建模思想,利用面向对象方法开发了基于知识工程(KBE)的机械产品参数化设计平台.该平台以三维CAD系统API模块为接口,采用ActiveX Automation技术,通过消息数据通信,将.NET开发的设计系统与CAD/CAE软件进行无缝集成.以桥式起重机设计为例,在知识重用和产品信息共享的基础上快速实现三维建模与虚拟装配,为数字化设计与制造提供了高效,准确、实用的方法.     

A decision-making framework model for design and manufacturing of mechanical transmission system development

Knowledge-based systems are proving to be a powerful tool with great potential for developing intelligent design support environments to improve quality of products and reduce product development costs by eliminating or minimizing many of the trial-and-error iterations involved in product development. This article describes an approach towards the development of intelligent design support environments for mechanical transmission systems, along with implementation details of a distributed knowledge-based gearing design and manufacturing system that is deployed over the Internet. The system embodies the various tasks of the design process, with modules that address: performance evaluation, process optimization, manufacturability analysis, and provides reasoning and decision-making capabilities for reducing the time between gear tooth creation, detailed design and final production. This methodology is highly desirable in that it is able to simulate real working conditions, evaluate and optimize the design effectively, prevent designers from time-consuming iterations and reduce long and expensive test phases.     

复杂生产过程产品模型研究

为了解决当前产品模型描述复杂生产过程过于复杂化,导致计算机系统难以理解和执行力低下等问题,提出了一种面向复杂生产过程的新的产品模型构建方法.通过研究了制造执行系统基础运行平台以及产品模型在制造执行系统中的作用的基础之上,提出了产品模型自顶向下的框架结构,并介绍结构中相关对象定义.通过详细阐述产品模型结构中各个对象所代表的具体内容及其相互关系,从而完成整个产品模型的配置过程.结合具体实例的描述过程以及对模型的分析,表明了所提出模型的可行性与有效性,为复杂生产过程产品建模提供了一条可行的解决途径.