Modular design for increasing assembly automation

Modular design can address the need for a high number of product variants and further allow a higher degree of automation in the assembly line. A framework is developed for the simultaneous modular product design and the design of automated manufacturing system. Product designs are optimized for automation using Design Structure Matrix and Modular Function Deployment. Alternative production systems are designed and accessed based on the analysis of assembly steps hierarchically. The implementation of the framework on the design of a production system for furniture assembly, able to handle multiple variants with a large number of components, is demonstrated.     

基于专利知识的计算机辅助产品创新设计系统研究

基于对专利重要性的认识,以钻夹头产品为例,系统分析了专利文献中可供创新设计参考的专利技术知识,提出了基于专利知识的产品设计和专利侵权检查的方法。在此基础上开发了基于专利知识的计算机辅助产品创新设计系统。该系统能够根据设计要求,在专利知识库中从不同创新层次进行专利检索,为设计师提供创新参考;同时具有对新设计结果进行计算机辅助专利侵权检查的功能,从而有效避免了设计的侵权行为,有助于快速形成企业的自主知识产权。     

A robust design approach to determination of tolerances of mechanical products

Tolerance specifications of design parameters influence both functional performance and manufacturing cost of products. Product functional performance is usually affected by uncertainties of design parameters, robust design can make product functional performance insensitive to those uncertainties. Based on the robust design method and the cost-tolerance models, a mathematical model has been developed for describing the relationships among functional performance, manufacturing costs, design parameters and tolerances. A new robust optimization method has also been developed to determine tolerances and design parameters simultaneously. This new approach has been used for determining design parameters and tolerances of a coating head of printing machinery.     

Method to explore technology innovation fully exploiting in-house capabilities

This paper proposes a design method to seek potential product innovation fully exploiting in-house capabilities. The method triggers scientists, designers and engineers in discovering both new instantiations of physical principles and new physical phenomena that may appear by modifying the embodiment of existing technologies. The embodiment modifications are constrained by the in-house manufacturing techniques to seek innovative solutions without the burden of heavy capital investments. The newly discovered principles and phenomena are tested for possible affordances leading to new product functions. The design method is applied in an industrial technology exploration and led to the discovery of two new technologies.     

绿色适应性设计研究

如何在产品设计初始阶段系统考虑产品及设计的环境性、适应性、重用性,通过产品功能拓展、升级换代、寿命延长、适应性变型,充分再利用产品资源及设计信息资源来实现绿色设计/绿色制造,目前仍然缺少系统、实用的方法和支持工具;论文针对这一问题提出绿色适应性设计研究,并给出了绿色适应性设计的主要研究内容及其关键技术,指出绿色适应性设计是对现有绿色设计理论方法的进一步补充、完善和具体化,对解决目前绿色设计方法在应用过程中所面临缺乏明确、实用指导的问题具有重要意义。     

Adaptable Design

Increasing competition for better product functionality, quality, features, customization, environmental friendliness, lower cost and shorter delivery time presents unprecedented challenges for product manufacturing enterprises. These challenges cannot be completely addressed by advanced manufacturing technologies alone as some of which are originated from product design. Advanced design technologies and tools for early product design processes are critically needed where most important decisions are made with respect to the product functionality, quality, manufacturability, cost and environmental performance. This paper discusses adaptable design (AD) as a design paradigm for both business success and environmental protection. Adaptable design aims at developing products that are adaptable in their design and/or their production. Adaptability is defined as the extension of the utility (service) of products. Two types of adaptabilities are proposed as product adaptability and design adaptability. Two types of design adaptations are also identified, which include foreseeable specific adaptations and unforeseeable general adaptations. The former can be described by specific adaptability and the latter by general adaptability. Three key elements of AD are presented including functions independence, a measure of adaptability and a function based design process model of the AD. Based on these concepts and design objectives, adaptable design methods and general design guidelines are proposed. Examples are included to illustrate the concepts, design methods and guidelines.     

基于双向驱动机制的产品变型设计研究及实现

在分析当前的三维参数化技术的基础上,结合产品的基于事物特性表的建模方法,利用粗集理论对零部件模块进行合理化和系列化。把产品变型设计过程看作是对产品模型的约束组的求解和尺寸驱动,提出了可双向驱动的变型设计方法,方便地实现了产品模型的自顶向下和自底向上相结合的产品快速设计。利用Pro／TOOLKIT工具包与VC．NET语言开发了复杂产品的变型设计模块原型。本文所提出的方法在汽车零配件的产品设计中得到了成功验证。     

基于层次化单元的产品设计及BOM生成算法的应用研究

针对现有计算机辅助工具对早期设计支持不足的特点，以层次化单元为基础，建立了一种介于概念设计与详细设计之间的装配模型，该模型即能充分表达早期设计中产品的功能需求，而且在描述产品必要结构的同时又能与详细的产品数据和几何信息产生一定的关联，使得概念设计结果能直接作为后期设计的输入，在后期设计中讨论了产品结构树的生成算法，并以此为基础开发了针对电梯产品的软件系统。     

塑料模脱模与抽芯联合机构的设计

模具设计可遵循很多的规律和经验，但具体到产品，应有大胆的创新理念，本文结合生产实际中某一塑料件产品的模具设计，提出了一种顶出脱模与侧向抽芯的联合机构，设计新颖，结构简单，理想地实现了设计要求，并在生产实践中取得了很好的经济效益。     

基于产品系谱的概念结构多方案设计方法

将生命现象中的系谱理论引入产品概念结构设计中,提出了基于产品系谱的概念结构多方案设计方法.根据产品从定量到定性的进化逻辑,得出不同概念结构之间的结构联系,表达为进化谱系,建立了产品系谱的描述模型,为实现概念设计的智能化提供了统一的功能同构模型;根据产品从定性到定量的演化逻辑,提出了基于系谱的产品结构设计策略,通过系谱单元之间的关系网络,可以得到多个变异设计方案,为产品的创新设计提供支持.最后,设计实例验证了所提出的基于系谱的概念结构多方案设计方法在产品设计中的成功应用.     

阶梯接线片的多工位级进模设计

在对一新型汽车线束用阶梯接线片制件的冲压成形工艺进行充分分析的基础上,从横排、纵排、横向对排、纵向对排、斜排五种可行的加工工艺方案中得出一种最佳方案,设计了冲孔、打筋、商标、倒角、落料、弯曲成形的15工位级进模,通过排样阐述了基于制件特点的三次90°直角弯曲设计和开放式冲裁凹模的设计,模具投入生产后一直使用正常,制件质量符合图纸要求。     

Axiomatic Design of Automotive Suspension Systems

This paper presents kinematic design methodology of a suspension system using Axiomatic Design (AD). AD is applied to typical three types of the front suspension systems: McPherson strut, double wishbone and multilink. Our study includes the analysis of the functional independencies of current suspension design configurations, which would add to the understanding of how various suspension hardpoints influence the suspension functional requirements (FRs). In addition, this paper also proposes sequential design orders in suspension kinematic design to satisfy all of the suspension FRs. Of the current kinematic designs, the multilink is a decoupled design, whereas McPherson strut and double wishbone are coupled designs. It is shown that a coupled design can be decoupled by applying the independence axiom. The design matrices formulated for the suspension systems indicate a specific design order to satisfy all FRs.     

电源插件壳体注射模设计

根据电源插件壳体塑件的要求,塑件上2-Ф1.5mm孔要一次成型,围绕2-Ф1.5mm孔的一次成型,提出了模具的分型要点,并对模具动作进行分析,完成了模具的结构设计及制造。经生产实践验证,模具结构设计合理,操作可行,塑件能满足用户的要求。     

基于Dual-Kriging模型多目标稳健设计在板料拉深成形中的应用

板料拉深成形工艺中,由于设计参数波动的影响,导致在传统最优工艺条件下成形件质量不够稳健。该文采用板料成形有限元仿真、代理模型,并结合稳健设计思想,提出基于Dual-Kriging模型的稳健设计方法。筛选影响成形质量的主要模具几何、工艺参数,并确定其相应波动范围;基于有限元仿真,运用Kriging模型,建立设计参数与成形质量的函数关系;根据参数波动情况,基于第一重Kriging模型以及Monte Carlo模拟,运用Kriging模型,建立设计参数与成形质量期望与方差的第二重模型;运用基于拥挤距离的粒子群算法,以及灰色关联分析进行多目标优化,完成设计参数的稳健设计。将该方法运用于NUMISHEET 93的方盒件拉深成形,与传统确定性优化设计相比,可有效减少成形质量的波动范围以及不确定性分析的计算量,提高成形件的稳健性。     

单拐曲轴多向挤压模具的设计与优化

单拐曲轴多向挤压成形较传统生产方式大大缩短了工艺流程,实现了单拐曲轴的全流线成形,且批量生产对其模具设计也提出了更高的要求,针对单拐曲轴多向挤压工艺模具的特点,从模具的服役环境出发,对多向模具结构中镶块部分进行分析和优化。根据镶块分模面的位置不同,设计了"窄镶块"和"宽镶块"两种类型,通过数值模拟和实验验证的方法,进行了较深入的分析和对比。研究结果表明:采用镶块方式设计模具具有可行性,"宽镶块"模具结构具有较高强度和刚度;实验中窄镶块易出现"折痕"缺陷,而采用宽镶块结构有效避免了该类缺陷。镶块结构有助于降低单拐曲轴模具制造成本和提高产品质量。     

Integration of Product Design and Assembly Planning in the Digital Factory

As assembly process planning fulfils the main function of connecting product design to production simulation and thus, the production system itself, a feasible software solution is needed to support this process. Thus, a novel concept is presented that aims at improving the integration of digital product design and assembly planning by introducing a consistent data structuring. This approach helps to reduce redundant tasks and supports the continuous data exchange. It is based on the use of assembly features, i.e. pre-defined geometry elements that contain additional technological information.The prototypical implementation of the concept focuses on the use of commercially available software tools, expanding them with additional functionality for the application of assembly features. The feature-based concept has been tested with a scenario from the automotive supplier industry. For the considered assembly, a comparison between the conventional and the feature-based planning approach is presented in the paper. It points out that the major advantages of the developed concept can be seen in an improved data consistency as well as a higher level of efficiency within the planning activities.     

基于Matlab的公差稳健设计

本文认为产品寿命周期定义中应增加一个市场开拓阶段，认为产品全寿命周期成本应当包含生产成本、品牌成本和使用成本三大主要部分。利用质量损失回收提出基于成本的公差稳健设计原则，然后应用Matlab工具求解公差设计模型，设计结果具有稳健性和简便性。     

电子数据捕获系统在新药临床试验中的影响

随着计算机和网络技术的发展,电子数据捕获(EDC)系统在新药临床试验中的优势不断显现,并受到新药临床试验研究机构的青睐。EDC凭借其技术上的优势,简化了传统以纸张病例报告表为载体的临床试验流程,克服了其数据录入和数据清理滞后的缺点;研究者、临床监查员、数据管理人员等在应用EDC系统情况下的角色和职责分工也发生了相应的改变;同时,其为新的试验设计和统计方法,如适应性设计方法的应用实施提供的有利的平台。     

基于理想变形理论的板料成形过程的设计与分析

本文讨论一种基于理想变形理论的板料设计与分析方法。并推导有关的有限元方程,文章首先在弹塑性体理想变形关系的基础上推导应力－应变关系及其增量形式,然后讨论基于理想变形理论的有限元方法在板料成形中的应用,该方法既可以用于板料的设计,也可以用于板料成形过程的分析,本文最后推导了该理论用于上述两类问题时的方程,讨论的材料为各向同性的理想弹塑性材料,而并未涉及材料的具体特性。     

一模多用的冲孔模

对同类产品进行分析 ,在工艺编制和设计中寻找共同因素 ,以此设计出一种多用模 ,并阐述了此多用模的结构及使用方法