支持公理设计的产品符号语义模型

通过对产品功能和结构信息的多样性及相似性分析提出了符号单元的概念。将符号学方法与产品设计的公理与过程相结合,借助符号单元所具有的形状载体作用及其富有的高层次工程语义来实现产品模型的高层功能描述与低层几何表示的统一;给出了覆盖实例对象和类对象的统一的符号对象数据模型,并与语义相结合来描述符号对象及其之间的相互关系,实现了对符号单元抽象化与形式化表达。实例研究结果表明,该设计方法使设计者可以更直观自然地在高层次的语义层表达设计意图,并且实现了对产品公理设计的支持。     

面向大规模定制的网络制造资源优化配置

为实现大规模定制(MC)环境下的网络制造资源共享与优化配置,该文提出了基于蚁群算法的MC网络制造资源配置解决方法,设计了MC外协任务-制造资源模型总体框架,建立适合MC的网络制造任务模型和制造资源模型,运用语义匹配算法进行了资源检索,并实现了基于蚁群算法的MC网络制造资源优化配置。最后,开发了MC网络制造资源配置原型系统。工程机械实例表明,该方法对提高MC网络制造资源配置效率具有显著效果。     

Self-organized evolution of mechanism kinetic scheme based on axiomatic design

The self-organized evolution technology of the mechanism kinetic scheme based on axiomatic design is presented.This technology tries to express the constraints between kinetic mechanisms briefly in a semantic form which is more familiar to the designers.Though the mapping process between the kinetic chain unit and the unit instance,the evolution from abstract unit to concrete engineering instance is achieved.The subdivision of unit coupling semantics is studied.and the evolution of semantics is finished.Also.the semantic constraints evolution of unit coupling semantics is described.The product structure models with function and assembly meanings are constructed based on the kinematic chain unit and unit coupling.It provides a basis to realize the inheritance and transfer of constraint information from conceptual design to design for assembly(DFA).As the engineering practice result shows,the method Can help the engineers express their design intension more clearly and naturally in a high semantic level.And the automation,recursion and visualization of the mechanism kinetic scheme design are realized.     

芯棒参数对超薄壁管数控绕弯成形质量的影响

为提高超薄壁管材的弯曲成形质量,研究了芯球个数、芯球厚度和芯棒支撑角度等芯棒参数对壁厚变化和椭圆度的影响。设计了3种芯球厚度和7种芯球个数,组合得到21种不同的芯棒支撑角度方案,建立了超薄壁不锈钢管材数控绕弯成型有限元分析模型进行仿真计算,并进行了试验验证。结果表明:芯球个数对壁厚减薄的均匀性有一定的影响,芯球个数相同时,芯球厚度越小,最大壁厚减薄率也越小,最大壁厚减薄率随着芯棒支撑角度的增大而变大;随着芯球个数、芯球厚度或芯棒支撑角度的增加或变大,椭圆度都有减小的趋势;同时总结出超薄壁不锈钢管材的合理的芯棒支撑角度范围为θ/3～θ/2。此项研究对指导芯棒参数设计、提高超薄壁管材的成形质量具有重要意义。