Case Representation in Rapid Response Variant Design

A new case representation is proposed. Design process is included in this case representation. The record of design process provides designers with rationale and assumptions behind design solutions. This kind of case representation not only provides better understanding of design solutions among designers, but also helps designers create new solutions in case modification stage.

A Novel CAPP System Based on SML for Variant Design of Process Planning

The production model of“multi-specification and low-quantity”is becoming the main trend of manufacturing industry.As a key activity in the manufacturing chain,traditional computer aided process planning(CAPP)system fails to adapt to the production model of customization.Therefore,a novel method for variant design of process planning was proposed to develop CAPP system based on Tabular Layouts of Article Characteristics(Sach-Merk Leisten in German and SML for short). With the support of standard database of master process planning documents which are developed by parameterization technique, and instance process planning for special product(instance product)can be generated automatically by the sub-system of variant de- sign of process planning.Finally,a CAPP system was developed for process design of rotor of steam turbine to validate the feasibil- ity and applicability of the method.

Computer-Aided Rapid Variant Design System for Hydraulic Support

The paper gives a detail analysis on the necessity of rapid hydraulic support design, and presents a computer-aided rapid variant design system for hydraulic support. The system integrates the type selection and embodiment design of hydraulic support. Case-based reasoning and rule-based reasoning are the main reasoning methods. Several crucial problems are discussed.

Rapid Variant Design of 2K-V Type Reducer by Cascaded Skeleton Driven

In order to accelerate the product design and shorten the development cycle, the product design base on Top-Down and product level parametric design method. Based on the 2K-V type of product structure tree, the mapping of the structure tree to the hierarchical skeleton feature tree is completed and the modeling of the~ product＇s 3D cascade skeleton is built with Pro/E skeleton Technology. The skeleton model is the basis of assembly, then to build the framework of the model＇s cascade constraints and to realize the whole model driven by the top skeleton parameters. The designers can build new models in the design of the similar structure through the rapid variant design of top skeleton parameters

高速列车转向架变型设计知识推送系统构建与应用

变型设计是实现高速列车转向架定制设计的关键技术之一。针对当前高速列车转向架变型设计过程中缺乏有效的知识管理与重用方法,进而影响转向架设计效率与质量的问题,提出高速列车转向架变型设计知识推送系统构建与应用框架,分析高速列车转向架变型设计知识,利用知识图谱技术实现转向架变型设计知识的结构化表达与存储。基于此,提出知识图谱嵌入与路径推理相结合的知识推理技术,匹配并筛选出与当前转向架变型设计活动相关联的设计知识;开发高速列车转向架变型设计知识推送系统,实现嵌入设计活动的知识主动推送,并以高速列车构架变型设计为例,验证该系统能够为设计人员提供一个集成的知识支持环境,其具备一定的可行性与工程应用价值。

飞机结构件智能协同设计方法与技术

为了提高飞机结构件的设计质量、效率和知识重用度,构建了人机混合增强智能协同设计平台。结合模糊技术和规则推理,设计基于模糊规则推理的专家系统,实现对飞机结构件的选型;利用CATIA CAA二次开发技术对飞机结构件进行基于尺寸和特征的参数化建模,实现飞机结构件模型的快速建立;基于实例推理对最佳相似零件进行检索,通过变型设计得到目标实例,并对目标实例进行实例评价与学习。以此完成飞机结构件的人机协同智能设计,提升飞机结构件设计能力,积累设计经验与知识,重用设计知识,提升飞机研发能力,缩短飞机研制周期,为装备制造业的智能协同设计提供了良好的理论基础。

Study on Design Methodology of Mass Customization Products

Based on introduction characteristics and classific at ion of Mass Customization (MC), the paper expounds foundations and design me thods of MC. The foundations of MC production are standardization, seriation and normality of production, guiding thought of Concurrent Engineering (CE), ap plication of CAD/CAM technology and etc. And design methods of MC products are d esign for product family, modular design, parameterization CAD, variant design, design for manufacturing (DFM) and design by customers. Design for product famil y is a method that first to design a basic form of the product, and then to with draw variant parameters to become a variable product model, makes a family or a series of product design at the same time. Modular design is that based on produ ct function analysis of different function or the same function but different sp ecification within a certain scope, divides and designs out a series of function modular, and through selection and combination of the modular can make up diffe rent products. Parameterization CAD is a CAD method that has function of dimensi on drive. Variant design is a method that under circumstance of keeping principl e constant and construction similar or likeness, properly adjusts part of constr uction and design parameters to adapt design demands. DFM demands the designer t o consider problems that will appear in manufacture in the stage of design, and to avoid them through optimal design. And design by customers is guiding custome rs to design within the scope of production capacity of enterprise and optional items that enterprise has designed to satisfy their requirements of form, functi on and price. Among them modular design, parameterization CAD and variant design are key technology of design methods of MC products. And design by customers is a main characteristic of design of customization product, and an effective sale means also.

Configurable Product Design Considering the Transition of Multi-hierarchical Models

The current research of configurable product design mainly focuses on how to convert a predefined set of components into a valid set of product structures. With the scale and complexity of configurable products increasing, the interdependencies between customer demands and product structures grow up as well. The result is that existing product structures fails to satisfy the individual customer requirements and hence product variants are needed. This paper is aimed to build a bridge between customer demands and product structures in order to make demand-driven fast response design feasible. First of all, multi-hierarchical models of configurable product design are established with customer demand model, technical requirement model and product structure model. Then, the transition of multi-hierarchical models among customer demand model, technical requirement model and product structure model is solved with fuzzy analytic hierarchy process （FAHP） and the algorithm of multi-level matching. Finally, optimal structure according to the customer demands is obtained with the calculation of Euclidean distance and similarity of some cases. In practice, the configuration design of a clamping unit of injection molding machine successfully performs an optimal search strategy for the product variants with reasonable satisfaction to individual customer demands. The proposed method can automatically generate a configuration design with better alternatives for each product structures, and shorten the time of finding the configuration of a product.

Parametric Collaborative Design of Network-based Mechanical Products

Aiming at the problems of low-level information sharing, slow transmission and repetitive work in the designing process of product series, the internet-oriented parametric collaborative design method is proposed, in which the problems of sharing conflict and network heterogeneous in the distributed collaborative design are analyzed, and the construction method of collaborative design platforms based on PDMWorks Workgroup is put forward. Through studying the mechanism of roles distribution and function allocation and data concurrency control, the communication mechanism of internet-oriented collaborative design is formulated. On the basis of structure features of overhead travelling crane, through combining parametric variant design with collaborative design, internet-oriented parametric collaborative design system of overhead travelling crane is developed and verified through main girder design. In the paper, the internet-oriented parametric collaborative design method is proposed, aiming to solve the problems of low-level information sharing, slow transmission and repetitive work in the designing process of product series. The problems of sharing conflict and network heterogeneous in the distributed collaborative design are analyzed. The construction method of collaborative design platforms based on PDMWorks Workgroup is put forward. The communication mechanism of internet-oriented collaborative design is formulated, through studying the mechanism of roles distribution and function allocation and data concurrency control. On the basis of structure features of overhead travelling crane, through combining parametric variant design with collaborative design, internet-oriented parametric collaborative design system of overhead travelling crane is developed and verified through main girder design.

基于主从关联优化的产品族参数规划方法研究

针对产品族优化设计中存在的共性与个性的相互依存、制约关系,研究面向产品族的主从关联的参数优化规划技术。建立基于灵敏度分析的产品族参数识别划分方法,根据产品族设计参数的主从关联特点,建立优化问题的双层规划模型。提出一种采用多项式响应面拟合和遗传算法相结合的混合算法实现双层规划,下层采用多项式响应面法将双层优化目标拟合成为单层优化目标,在上层实现产品族公共参数的优化,再通过上层可适应参数的松弛约束关系传递,在下层利用遗传算法实现变型产品的参数优化。以起重机卷筒组件产品族规划为例,基于所提出的主从关联优化方法,得到个性变型产品参数最优值,为起重机卷筒组件产品及类似产品的产品族优化设计提供一种方法借鉴。

Judgement of Design Scheme Based on Flexible Constraint in ICAD

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基于“互联网+”电梯轿厢模块化结构变异设计

【目的】为了满足用户对低能耗、轻量化电梯轿厢模块化结构的快速定制化需求,搭建了一种“互联网+”轿厢模块化结构变异设计框架。【方法】首先,在B/S架构下,采用Vue技术开发用户自定义设计数据采集前端,获取用户定制化设计需求,并通过Springboot技术开发模块化结构变异设计后端,搭建前后端分离的Web框架,实现前后端数据的双向绑定。其次,在后端引入一种考虑应力约束的高比刚度拓扑优化设计方法,以轿厢结构强度和体积分数为用户自定义约束条件,以轿厢模块化结构刚度最大化为优化目标,采用移动渐进线优化算法为求解器,驱动轻量化电梯轿厢模块化结构的快速定制化变异设计。然后,在优化方法中引入Heaviside函数,以保证设计结果具有清晰的几何边界。最后,以某型背包电梯轿厢架为例,在用户自定义界面设定轿厢结构的几何与力学边界参数,开展创新型轻量化轿厢架结构的变异设计,并对其进行有限元仿真分析。【结果】在给定设计需求的前提下,结构变异过程稳定、收敛性强,所设计的结构几何边界清晰;在相同的力学边界条件并满足材料的2倍最小安全系数条件下,所设计的轿厢架结构的质量比原有结构的下降了16.09%,其结构变形满足实际应用需求,其比刚度得到了显著提升,验证了所搭建结构变异设计框架的有效性。【结论】所搭建的设计框架能在保证结构强度的前提下提高结构的比刚度,可有效应用于轻量化电梯轿厢模块化结构的快速定制化设计,缩短了轿厢模块化结构的设计周期,丰富了轿厢模块化结构的设计手段。

一种“可抛机翼”变构型飞行器设计与性能分析

变构型飞行器可以通过改变自身构型在不同的飞行条件下同时具备良好的气动特性,从而适应不同的任务需求和飞行环境。针对传统变构型方式会增加飞行器质量和结构复杂度的问题,设计了一种具有“可抛机翼”的变构型飞行器,其常规构型可实现高亚声速巡航,在抛离机翼后变为弹体达到超声速,用于末段突防、打击等军事用途,针对变构型前后2种状态进行不同飞行条件下的数值计算,初步评估该飞行器的气动性能,再通过飞行仿真模拟飞行器从抛离机翼到加速冲杀的全过程。研究结果表明:这种飞行器可以通过构型的改变适应不同的飞行环境,为高速变构型飞行器的构型设计提供参考。

基于Creo的自顶向下参数化设计方法

为提高设计质量和效率,并满足快速变型设计需求,在Creo软件平台支持下,采用自顶向下设计模式,通过骨架模型、关系式、尺寸约束、特征参照等参数化设计方法,实现设计信息从装配体向子装配体传递,再从子装配体向零件传递的过程。结果表明,该设计方法能有效降低设计出错率和工作重复率,尤其在进行系列化设计时,对关键参数信息调整后再进行模型再生,即可高效完成变型设计。

基于3D打印的船载无人机参数化设计

以降低船载无人机重量,提升船载无人机力学性能为目的,设计基于3D打印的船载无人机参数化设计方法。通过面向3D打印的SolidWorks软件建立以船载无人机结构柔度最小为目标,以体积、梯度等为约束条件的船载无人机参数确定模型;利用变权重变异鸽群优化算法,求解该模型,确定最小结构柔度对应的船载无人机参数;依据确定的参数,建立船载无人机的三维模型,并导入3D打印软件内;3D打印技术以分层处理的方式,完成船载无人机参数化设计。实践证明,该方法可有效确定船载无人机参数,建立船载无人机三维模型,有效完成船载无人机参数化设计。该方法设计的船载无人机最大应力较大,符合无人机结构刚度与强度等力学性能需求。

基于参数化的机械产品尺寸变型设计研究与实现

在分析当前三维参数化设计技术的基础上,结合 CAD系统、参数化思想和层次型数据表技术,提出了一种产品级的参数化变型设计方法。利用 SolidEdge变量表、Acess数据库和VB语言,开发了基于 SolidEdge的产品参数化变型设计系统。以注塑机的合模部件为例,演示了所提出的方法和开发系统的实际应用。

可拓学中优度评价方法在变型设计中的应用研究

大批量定制是一种面向 2 1世纪制造业的重要生产模式 ,其核心在于通过各种产品的变型设计等方式 ,以便有效地解决大批量生产的低成本、短交货期与定制生产的高成本、长生产周期的统一问题。本文论述了可拓学中优度评价方法 ,并以变型设计为例 。

基于事物特性表的产品变型设计研究

在对面向大批量定制的开发设计技术和事物特性表技术研究的基础上 ,提出了基于事物特性表和参数型CAD的产品变型设计系统的总体框架 ,并对基于事物特性表的产品变型设计的关键技术———如何在参数型CAD中创建产品的主模型、如何建立产品的事物特性表以及如何对产品进行变型设计进行了的探讨。在VB的环境下 ,采用面向对象方法集成了参数型CAD—SolidEdge和数据库SQLSever,开发了一个产品变型设计系统原型。

基于事物特性表的产品变型设计

事物特性表描述了标准化和规范化的产品信息,可以方便地实现产品变型设计和下游过程的变型响应。本文基于计算机集成产品工程哲理与方法,以CAD系统SolidEdge为具体应用对象,研究了基于事物特性表进行产品变型设计的原理,并借助Excel的表处理功能建立了事物特性表,对SolidEdge的变量表功能进行了二次开发,还通过二者的集成,实现了产品变型设计的方法和过程。最后,通过应用实例,验证了方法的可行性。