装甲车辆模块化实验平台总体研究

从装甲车辆的创新设计出发,针对装甲车辆实验平台进行了探索和研究,通过装甲车辆的需求分析,利用模块化的相关概念对实验平台进行模块划分和设计,为探索和验证装甲装备新概念和新技术提供一个重要的实验环境。     

基于模块化设计理论的数控成形磨齿机模块化结构

模块化设计有许多优点.机床模块设计包括模块划分和模块集成两方面内容.详细阐述模块化设计原理的基础上,指出了机械产品模块化设计的一般步骤.并以数控成形磨齿机为例,依据模块化设计理论,分析了该机床的功能,并对机床结构进行了模块划分和模块集成,实现了该机床的模块化设计.     

模块化设计方法及其在机械设计中的应用

介绍了模块化设计产生的历史、模块和模块化设计的概念，分析了模块化的特征、作用与优点，阐述了模块划分的原则，并对模块化设计方式和模块化系统进行了分类，详细介绍了模块化设计的具体步骤，分析了模块化设计和现代技术之间的密切联系，并用数控立式车床的模块划分来举例说明了模块化设计方法在机械设计中的应用。     

液压机广义模块化设计原理及其应用

针对液压机的设计特点,分析了传统模块化设计的不足之处,提出了模块化、参数化和变量化集成设计的广义模块化设计方法。给出了液压机广义模块化设计的基本原理,并对广义模块划分、模块结构参数化和变量化分析等关键技术进行了论述。最后,通过一个液压机模块的设计实例,进一步说明了广义模块化设计的特点。     

基于模块化设计理论的自动钻铆系统设计

根据模块化设计理论,设计了一种飞机壁板装配自动钻铆系统,实现了飞机钻铆自动化.首先对模块化设计概念及其特点进行了简要阐述,指出模块化设计的一般步骤;然后按功能要求对自动钻铆系统进行模块划分;最后设计了相应模块的机械结构,并对自动钻铆系统中最重要的末端执行器模块进行了较深入的探讨.     

基于可拓理论的模块化设计方法研究

针对模块化设计理论难以工程实现的问题,提出了基于物元模型及可拓方法的产品可拓模块化设计方法。该方法首先在物元模型的基础上,结合模块自身特点,建立了模块物元与模块族物元,以有序三元组的形式规范化地保存了历史模块和模块族数据,并研究了模块物元的可拓性及其变换。然后运用可拓方法对模块物元进行变换与操作,既实现了对模块划分、模块检索与匹配,以及模块综合等模块化设计过程的形式化描述,又为模块化设计提供了新的思维方法。最后,给出了可拓模块化设计方法在导弹产品开发中的应用实例。     

基于柔性模块的粗纱机广义模块化设计及其建模技术研究

本文论述了柔性模块的概念和相关知识,建立了柔性模块参数化几何模型并将广义模块化设计思想引入定型产品设计.在此基础上对粗纱机广义模块化设计进行了研究给出了粗纱机柔性模块信息模型,对其中的喂入模块进行了柔性模块的创建.     

信息公理在模块选择决策中的应用

分析了公理设计理论和模块化产品设计之间的联系,将公理设计应用于模块的选择决策中.利用信息公理对模块化产品中的模块进行信息含量计算,从众多满足顾客需求的模块中,将具有最小信息含量的模块组成产品,为模块化设计提供了一种科学的决策方法.     

基于用户需求的数控机床模块化设计系统研究

本文针对数控机床制造业用户需求的多样化和个性化,提出了面向客户的数控机床模块化设计思路,结合数控机床的发展现状对数控机床模块的建模原理和技术进行研究,提出面向客户的基于产品全生命周期的模块划分方法,在获取客户需求的基础上针对数控机床进行模块模块化设计,并给出了模块化设计的实例。     

基于MDT的加工中心机床模块计算机辅助编码管理工具

实现模块化制造需要解决的首要问题是模块编码和模块信息的描述。本文研究了加工中心类机床模块计算机辅助编码的方法 ,在 MDT软件平台上通过二次开发实现了相应的编码管理工具。利用该工具系统可方便地在机床模块的图形编辑环境下对新建模块进行编码 ,对已有模块进行检索、变型设计和组合设计的判断 ,通过模块的设计编码进行模块的信息描述 ,实现了计算机辅助模块化设计与制造中各环节的信息传递     

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...     

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.     

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.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

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....     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.