面向重用的设计过程知识领域本体的构建

根据对产品设计过程知识重用的要求,针对本体知识表示方法的特点,在提出面向重用的本体构建方法的基础上,构建产品设计过程领域本体知识模型,并运用protégé建模工具对产品设计过程知识本体进行系统实现,为实现设计过程知识的共享和重用提供支持.     

面向多领域的转向架知识本体表达及重用研究

针对转向架设计涉及多个专业领域,知识间关系复杂,跨专业知识表达存在异构的问题。对转向架设计知识特点进行分析,提出基于本体的转向架设计多专业领域知识表达方法,对转向架设计知识及层次关系进行明确的形式化的表达,并利用本体对跨专业领域概念的关系进行语义定义,解决了知识表达中跨专业概念异构问题。利用Protégé工具建立转向架多专业领域知识本体模型,为知识重用提供基础。最后,以转向架牵引电机设计为例,验证了方法的可行性和实用性。     

基于protégé的车身制造工艺本体模型及匹配方法

为了在车身制造工艺规划过程中实现工艺知识的重用和共享,提高对已有车身制造工艺的检索和利用效率.提出了车身制造工艺本体知识表达方法,采用框架概念图表示车身制造工艺;提出了基于结构相似度的本体匹配方法,由概念树结构判断本体是否相似;最后通过利用protégé本体构建工具建立车身制造工艺本体库,设计了相应的本体匹配实验,实验证明基于结构相似度的本体匹配方法是有效的.     

基于本体的白车身制造工艺知识的表示研究

利用本体表示知识的方法,构建了基于本体制造工艺知识库的框架和领域本体模型,提出了白车身制造工艺本体的描述方法,并且通过本体编辑工具Protégé对车身左前门工艺进行了本体语言描述,提供了一定形式的本体文件,为制造工艺知识的共享和重用奠定了一定的基础.最后对将概念相似度计算应用于基于本体的语义检索进行了探索.     

本体驱动的复杂产品系统设计信息重用框架

在前期的研究结果—公理化系统设计本体模型的基础上,建立了本体驱动的复杂产品系统设计信息重用框架,该框架由本体层、系统设计信息表达层和工程学科设计信息层组成.其中,本体层指的是公理化系统设计信息本体模型;公理化系统设计信息表达层是本体层的实例;重用发生在表达层和工程学科设计信息层之间,采用多策略本体结盟技术实现重用.最后,搭建了系统设计信息重用框架软件平台,开发了重用插件,并以卫星太阳翼的系统设计为例验证了所提出方法的有效性,证明了通过所构建的重用框架,设计师在系统设计时能够自动匹配并重用卫星总装数据库中具有相似语义的数据,改善了系统设计信息和不同工程学科设计信息之间互操作困难的问题.     

离散制造车间质量管控模式研究

为解决复杂产品离散制造过程中质量数据分散、质量问题难追溯、缺乏完善的质量管理模式等问题,开展了离散制造车间制造质量管控模式研究.通过对离散制造车间质量管控业务运行流程和质量数据链路进行分析,明确了车间质量管理的痛点与难点;提出了离散制造车间质量集成管控框架,建立了多工序质量传递模型,通过采用数字化检测设备与车间M ES...     

基于RFID的离散型制造物联实时数据采集系统的研究与开发

针对制造物联环境下离散制造车间生产数据采集实时性、可靠性差的问题,开发了一种基于RFID的实时数据采集系统。对离散制造车间数据采集与处理进行了分析,对数据采集系统的总体架构进行了设计,并且构建了系统的体系架构与功能模型。该系统采用多线程同步技术和数据库辅助设计程序,能够实现对车间现场实时数据的采集、车间生产任务的合理安排、车间加工设备和操作员工的实时监控。实现了一种新的车间现场生产数据采集方式,为实现离散制造车间的实时生产奠定了基础,有效的解决了各生产作业单位的信息断层与信息孤岛问题,提高了企业的生产效率。     

基于本体的液压元件知识建模研究

为了解决液压元件信息的形式化规范表示问题,以支持液压系统设计过程中知识的重用和共享,该文在系统描述了液压元件的分类和模型信息的基础上,提出了基于本体的液压元件知识建模方法,包括基于OWL的本体构建过程和基于MYSQL的知识库表示过程;并面向液压集成块设计,讨论了液压元件的本体建模过程,实现了液压元件知识的规范化描述和重用。     

基于实时信息驱动的制造过程可视化监控平台

针对目前由于缺乏有效的手段支持离散制造过程实时监控,导致生产车间透明程度低、信息流实时性差等问题,采用面向对象的方法构建制造资源本体模型(ROM)和一种支持生产系统实时监控的对象模型(IMPV),并定义了IMPV的对象数据模型、可视化表征模型、对象操作模型和信息交互控制模型。在此基础上,设计并实现了一种支持制造过程实时可视化监控的体系架构,详细讨论了IMPV的实例化方法以及基于规则映射的资源感知与信息集成模式,最后将该可视化监控系统应用于某发动机装配车间中,取得了良好的应用效果。     

基于本体的作业指导书自组织方法研究

针对传统作业指导文件编制时间长、指导信息不完整的缺点,提出了构建作业指导本体模型实现作业指导书自组织的方法。通过对车间制造作业指导需求的分析,建立了作业指导系统总体架构,运用Protégé本体建模软件构建了本体模型,并通过与工艺、制造资源等数据的映射完成作业指导书的快速自组织。通过应用实例验证了此方法的有效性和可行性。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...