机电一体化协同设计平台研究

为了提高机电一体化产品设计中多学科多专业设计人员协同设计的效率,利用CAX软件,基于Web的项目组级PDM,UML技术,虚拟现实样机技术搭建机电一体化协同设计平台,来满足机电一体化多学科的高效协同设计.重点讨论了组成该协同设计平台的基于Web的项目组级PDM服务器和完成各种设计任务的工作站群,以及该平台的运作过程.该平台的试验性运行结果表明,该机电一体化协同设计平台能够提高设计团队多学科多专业的设计人员协同设计效率,并且在设计过程中,设计人员进行创新性设计的比重有所增加.     

AVIDM工程分析与设计优化集成平台

工程产品（如导弹、卫星、发动机等）的设计通常涉及众多的设计人员,海量的数据资源,不同领域的软件工具,复杂的设计流程,是一个需要经过多个设计阶段逐步细化的、反复的过程,是人员、资源、工具和过程的综合。传统的设计方法和单一CAX软件往往只是针对特定的领域,缺乏与其他软件共享数据、进行通信的能力,CAX信息孤岛局面日益突出。如何有效地将CAX数据和CAX流程统一管理,并无缝地融合企业业务流程和技术流程已经成为企业信息化的重要课题。     

面向平台创新的阀门产品快速设计流程研究

为解决大型阀门产品的快速设计问题,基于大规模定制的设计特点,提出了一个基于产品平台的快速设计流程模型.阐述了大型阀门产品设计的实现过程,重点解决阀门产品平台设计、阀门配置模型设计和配置资源库的建立等问题.从平台创新的特点出发,基于功能基和模块化分析,建立了三偏碟阀产品族子集的功能结构视图和配置模型.最后,给出了原型系统实现的功能和具体应用实例.     

UG软件在系列化阀门产品设计中的应用

设计人中利用UG软件对阀门产品进行建立几何模型、参数化设计、有限元分析、机构分析和重量计算,从而提高了产品的设计水平,节约了大量的原材料,提高了企业的经济效益,同时体现出UG软件的优点。     

机电一体化协同设计平台研究

为了提高机电一体化产品设计中多学科多专业设计人员协同设计的效率,利用CAX软件,基于Web的项目组级PDM,UML技术,虚拟现实样机技术搭建机电一体化协同设计平台,来满足机电一体化多学科的高效协同设计。重点讨论了组成该协同设计平台的基于Web的项目组级PDM服务器和完成各种设计任务的工作站群,以及该平台的运作过程。该平台的试验性运行结果表明,该机电一体化协同设计平台能够提高设计团队多学科多专业的设计人员协同设计效率,并且在设计过程中,设计人员进行创新性设计的比重有所增加。     

基于LabVIEW的运载火箭阀门试验数据采集系统设计

为优化现有运载火箭的阀门试验系统,提高试验性能数据采集的精度,提高工人工作效率,设计了基于LabVIEW软件的运载火箭阀门试验数据采集系统,该系统可以实现运载火箭阀门性能试验数据的实时采集和显示,还可以回放历史曲线并存储相应信息,并利用预留的数据库接口与公司信息系统实现无缝对接.     

硫化罐卡箍的质量优化设计

应用CAE软件Proe,Ansys和协同优化软件Isight,构建了基于Isight的协同优化设计平台,解决了软件之间的数据通信技术问题和设计分析过程的自动化技术问题。并利用这一平台、基于分析设计的思想成功完成了对硫化罐卡箍的质量优化设计,为今后过程装备的改进优化提供了一种技术路线。     

浅析智能电气阀门定位器开发关键技术

HART协议不仅能够实现双向通讯,而且可使数字与模拟信号同时传送且互不干扰.本文介绍了一种基于HART协议的低功能智能型电气阀门定位器的设计方案,并就设计过重中硬件和软件相关技术问题进行分析.     

氮气弹簧开发系统多软件协同的平台设计

为了解决氮气弹簧设计过程中多软件的协同和大量设计数据的有效存储及合理利用问题,设计开发了多软件协同的氮气弹簧系统平台。从多软件协同、数据管理和仿真过程等方面对系统平台进行了阐述,在VB,VC环境下,对系统平台所需商用软件进行了二次开发,编制了系统仿真程序。该系统平台有助于缩短氮气弹簧的设计开发周期,提高生产效率,降低生产成本。     

基于PDM的CAX系统集成探讨

本文结合现代企业在CAX(CAD、CAPP、CAM)应用方面出现的问题,阐述了应用PDM作为集成平台,实现对CAX系统的集成,对集成模式和关键技术作了简要分析。     

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.     

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.     

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...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.