计算机辅助机构选型的实现

将机构选型的初始要求划分成运动功能和功能质量两种类型,用规范化方法描述运动功能,用人类自然语言描述功能,在计算机辅助机构造型过程中,由计算机完成精确的推理过程,得到满足运动功能的机构解空间,由设计者根据知识库提供的机构功能质量评价知识,选择满足功率质量要求的机构解,完成模糊的推理过程,由此简化了计算机辅助机构造型的推理机制,实现了机构选型的自动化,解决了机械运动方案CAD中的一大难点,为运动方案CAD的实现奠定了良好的基础。     

机械系统概念设计中机构智能选型的研究

本文对人机协同的机构智能选型的原理进行了研究 ,用集合 W 和GW 来描述机构智能选型的需求域QW 中的运动功能要求和功能质量要求 ,采用VisualBasic语言环境和数据库Access技术开发出MSICAD系统 ,实现了机械系统计算机辅助概念设计中机构的智能选型。     

基于机构创新设计的机构再生设计的探讨

介绍了机构再生设计法,该方法由传统的选型设计转向构型创新设计,在机构设计过程中缩短了设计周期,提高了工作效率.机构再生设计法着重研究现有机构简图一般化运动链,根据设计要求给原始机构一般化运动链各个杆件赋予不同的功能目的,从而再生出与原始机构不同构型的运动链.     

基于机构创新设计的机构再生设计的探讨

机构再生设计法打破了传统的机构设计方法，由传统的选型设计转向构型创新设计，在机构设计过程中缩短了设计周期，提高了设计工作效率。机构再生设计法着重研究了现有机构简图一般化运动链，根据设计要求给原始机构一般化运动链各个杆件赋与不同的功能目的，从而再生出与原始机构不同构型的运动链。     

自动化概念设计中机构功能的识别

对机构功能的计算机识别方式进行了研究和探讨,提出将机构功能划分为运动功能和功能质量两大部分,运动功能反映机构的运动特性,通过输入和输出构件的运动形式、运动轴线、运动方向和运动速率四个属性项目中的属性值对其进行全面描述,具有唯一性,是自动化概念设计中计算机推理的依据。功能质量反映机构的工作特性,是机构的一个属性值,用人类自然语言描述,在自动化概念设计中作为人类决策的依据。这机构功能的表达方式,计算机能够识别,而且符合人类设计思维,较好地解决了机械产品自动化概念设计中,机构功能难以识别的瓶颈问题。     

散热器排焊机的物料进给系统机构设计

根据某厂电冰箱散热器排焊机的自动化焊接要求,对散热器焊接进给系统进行了机构设计。设计中主要考虑了进给工作台的结构、夹具的结构和相关的传动部件选型,最后根据加工效率的要求选择了对应的步进电机。     

基于TRIZ理论的机构选型数字平台设计

机构选型要求设计者具备丰富的工作经验以及扎实的设计理论,此外还需要设计者查阅大量资料。为简化机构选型的过程,设计了机构选型数字平台以帮助设计者完成机构设计。在开发此数字平台过程中,要求机构数据最大化,检索耗时短,数据库结构小而紧凑。针对上述矛盾,提出使用TRIZ理论来解决,并结合软件开发技术,完成了机构选型数字平台的设计。当设计者选择给定的输入运动和所需的输出运动后,此数字平台为设计者提供满足设计要求的机构方案。     

功能分解有向网络图构造及计算机化实现

受运动复合机构构成原理知识欠缺的制约,基于功能综合方法的运动复合机构创新设计仍是挑战性课题。基于分层递阶理论,建立功能分解商空间模型,根据功能分解层粒度要求以及属性函数对目的功能层的贴近度,采用模糊等价映射和改进的宽度优先求解算法,给出手段功能层最佳分解方案,通过逐层分解细化,得到以基本操作为功能单元的功能分解与或树。遍历功能分解与或树分支及叶节点,确定功能有向网络图拓扑结构。在商空间模型下,功能分解是一个不依赖于知识与专家经验的粒度细化求解过程,能够解决运动复合机构功能分解问题,为后续获得由基本机构巧妙组合创成新颖组合机构方案提供功能分解模型支持。结合干粉压片机机构功能要求,给出了功能分解的算法及功能分解有向网络图构建的计算机化实现。     

开发机械运动方案设计软件 加强机械原理课程素质教育

机械原理作为一门设计类课程，要求综合各种典型机构进行简单机械运动方案设计的实战训练是十分必要的。根据《机械原理课程教学基本要求》，教材中增加了一章“机构的选型、组合及机械传动系统方案的设计”，课程设计内容也作了重要改革，由运动分析（图解法）改为机构综...     

间歇分度凸轮机构的选型设计

介绍了间歇分度凸轮机构的分类及其基本工作原理与优缺点。针对PCB自动化检测设备,对间歇分度凸轮机构的选型设计进行阐述。选型采用经验设计法,主要考虑凸轮分割器在实际工作中转矩的大小。经设计计算所选择的凸轮分割器在实际工作中运转稳定,能实现所需的效率和精度要求,可为工程实际中间歇分度凸轮机构的选型提供指导。     

数字化现代设计

为了适应当今和未来多变化的市场的需求 ,已逐渐形成一种基于计算机的旨在提高对市场的反映灵敏度、适应现代产品在功能、质量、开发周期的高要求的数字化现代设计体系。该系统以市场为空间 ,数字化为特征 ,实现设计的并行化、绿色化、机电一体化、稳健化、智能化、虚拟化。     

Conceptual design of compliant mechanisms using level set method

We propose a level set method-based framework for the conceptual design of compliant mechanisms. In this method, the compliant mechanism design problem is recast as an infinite dimensional optimization problem, where the design variable is the geometric shape of the compliant mechanism and the goal is to find a suitable shape in the admissible design space so that the objective functional can reach a minimum. The geometric shape of the compliant mechanism is represented as the zero level set of a one-higher dimensional level set function, and the dynamic variations of the shape are governed by the Hamilton-Jacobi partial differential equation. The application of level set methods endows the optimization process with the particular quality that topological changes of the boundary, such as merging or splitting, can be handled in a natural fashion. By making a connection between the velocity field in the Hamilton-Jacobi partial differential equation with the shape gradient of the objective functional, we go further to transform the optimization problem into that of finding a steady-state solution of the partial differential equation. Besides the above-mentioned methodological issues, some numerical examples together with prototypes are presented to validate the performance of the method.     

A Heuristic State–Space Approach to the Functional Design of Mechanical Systems

This paper presents a knowledge-based approach for automating the functional design of mechanical systems. By using our proposed automated functional reasoning strategy, which is based on a heuristic search method, a set of physical behaviours can be reasoned out automatically from the desired functions. The interconnection of these behaviours is possible when the functional outputs of one are compatible to the corresponding functional requirements of the next one. Though the design space for behavioural configuration is very large, by defining its heuristic evaluation function as a fuzzy multicriteria decision-making (FMCDM) problem, the proposed heuristic search method can lead to a near optimum design solution in a reasonable time. A case study for the automated functional design of an automatic assembly system is given to illustrate the operation of the proposed heuristic search method, and to show its effectiveness in functional reasoning and optimizing the final design.     

Compromise ranking approach for sustainable concept selection in an Indian modular switches manufacturing organization

The modern manufacturing organizations are forced to adopt the principles of sustainability to sustain in the competitive market scenario. Sustainability paradigm stipulates that manufacturing organizations develop eco-friendly products coupled with economic and social dimensions. Sustainability concepts include life cycle impact assessment, environmental conscious quality function deployment, environmental impact assessment, life cycle assessment, and theory of inventive problem solving. The concept selection in the context of sustainability is the typical multicriteria decision-making problem (MCDM). MCDM method can be used to find out the best alternative among the given alternatives. In our study, we have utilized the compromise ranking method namely VlseKriterijumska Optimizacija I Kompromisno Resenje. This method focuses on ranking and selecting from a set of conflicting criteria based on the measure of closeness to the ideal solution. The best concept has been selected for implementation in the organization as stated by Opricovic and Tzeng (Eur J Oper Res 156:445–455, 2004).     

混合驱动凸轮连杆机构的轨迹特性研究

介绍了混合驱动凸轮连杆机构的概念和意义，分析了混合驱动凸轮连杆机构的运动原理，推导出了计算公式。使用图解法对混合驱动的凸轮连杆机构的柔性空间作了分析，使用计算机仿真进行了验证，提出了轨迹设计原则。     

基于参数扰动的高速凸轮廓线动态设计

应用最优控制理论，提出以多设计点法来设计既有良好动态特性且抗参数扰动力强的凸轮轮廓曲线，并以实例验证了该方法的可行性。     

机械传动方案设计的状态空间法

以状态空间为纽带，将机械传动的原理运动方案与结构方案结合在一起，实现了计算机辅助方案设计的集成。在原理运动方案求解时通过扩大功能需求描述，引入相应的优化技术，实现了分解级数的自动确定，有效地界定了原理方案的解空间，避免了解的组合爆炸和众多无意义解的生成；由传递函数确定的结构集合的卡氏积运算实现结构的多方案设计，为相关设计提供一种新思路。     

Design of an analytic-hierarchy-process-based expert system for non-traditional machining process selection

The selection of a non-traditional machining (NTM) process is often observed to be a multi-criteria decision-making problem with conflicting and diverse objectives. This paper presents a systematic methodology for selecting the best or optimal non-traditional machining process under constrained material and machining conditions. The paper also includes the design of an analytic-hierarchy-process-based expert system with a graphical user interface to ease the decision-making process. The developed expert system relies on the priority values for different criteria and sub-criteria, as related to a specific non-traditional machining process selection problem. It also depends on the logic table to discover the non-traditional machining processes that lie in the acceptability zone, and then selects the optimal process having the highest acceptability index value. The proposed expert system can automate the selection of a non-traditional machining process and provide artificial intelligence in the multi-criteria decision-making process.     

An optimization method for components selection using quality function deployment

When a customer selects a product from a product family, the attributes of the components for selection are usually technical parameters instead of customer-familiar characteristics of the product. In this paper, an optimization method for components selection is proposed based on quality function deployment (QFD) to minimize the difference between the customer’s expectation and the selected product. The model is converted into an equivalent linear integer programming model to facilitate the solving approach. Fuzzy customer requirements are also considered in this model. A practical example from applying this model is presented to prove the feasibility and effectiveness of the model. The computation result shows that the mapping relations among the customer requirements, technical attributes, and component attributes are developed by matrices of house of quality (HoQ), and that the optimal solution corresponds reasonably with the customer requirements.