小型通用飞机液压油泵车的设计

根据航空兵部队对飞机液压系统保障的需求和现有油泵车的不足,该文利用新型液压元件和液压集成技术对油泵车的设计开展研究,设计了一个小型通用飞机液压油泵车。该油泵车具有体积小,操作简单的特点,且可适用于航空兵部队现役的所有机型。同时,通过外场测试,该小型油泵车可满足设计和使用要求。因此,若该装备投入使用后,可满足部队开展训练和执行多样化作战任务的保障需求,并提高飞机的维护保障效率,从而带来巨大的军事效益和经济效益。     

新型电极丝恒张力控制系统的研究

在高速走丝线切割机上，储丝筒正反向循环时放电区电极丝张力是否一致，直接影响线切割机的加工质量。为此，研究了一种新型电极丝恒张力控制系统，能够很好地解决电极丝张力的测量和储丝筒正反向循环时放电区电极丝张力一致的控制问题。     

智能型蓄电池恒流放电装置的研制

介绍了一种智能型蓄电池恒流放电装置。基于混合型模糊PID控制算法，利用单片机C8051F021、IPM智能功率模块和PIE放电负载，成功地实现了蓄电池的恒流放电。详细描述了该装置的硬件结构和软件模块，并提出了在硬件设计和软件开发中所运用的关键技术，最后介绍了该装置的主要功能。该装置具有体积小、重量轻、使用简单、恒流精度高等优点。     

液电航空综合保障车的设计

根据航空兵部队维修保障的需求和现役航空保障设备的不足,设计了一款集飞机液压系统检测、维护和航空地面电源保障为一体的液电航空综合保障车。分别从保障车的功能、预期达到的技术指标、基本组成、各系统的工作原理展开了该保障车的设计。保障车具有体积小、操作简单、机动性好、可靠性高,可同时给飞机提供液压和电源保障,可适用于航空兵部队现役的各种机型。该保障车的投入使用,将大大节约部队的维修保障资源,提高飞机的维修保障效率,具有广阔的应用前景和显著的军事和经济效益。     

新型径向恒流柱塞泵的设计

本文提出了新型的恒流柱塞泵的理论分析和设计，针对柱塞泵的运动情况，阐述了为实现柱塞泵的无流量脉动的柱塞的运动速度曲线所必须具备的特征，导出了几种常见的恒流特征速度曲线，并设计了径向恒流柱塞泵。     

徕卡(LEICA)最新产品CM1900切片机─—位于冷冻室之外的低温恒冷切片机

徕卡低温恒冷切片机系列又有了新的进展，在此向广大用户介绍一种应用于组织学和临床组织病理学的新仪器——CM1900快速低温恒冷切片机。新型徕卡CM1900是首次推出的将切片机置于冷冻室以外的低温恒冷切片机，在这种新型仪器的设计中，徕卡采用了现代组织病理所要求的新技术，可提供更完善的安全性能，人体工程学设计以及易清洁，防污染的构造。该新型仪器是专为常规诊断的应用而设计开发的，它同时具有现有的徕卡低温恒冷切机系列的各种理想的特点。CM1900是林卡奉献给广大用户的、用于各种已知低温冷冻切片的真正有效的仪器。新型CM19…     

巡检车全液压制动系统的设计

对巡检车全液压制动系统进行了设计。在设计中,对巡检车进行了制动效能计算、制动效能恒定性分析、制动方向稳定性计算。在此基础上,对基础制动装置和液压制动控制单元进行了设计。巡检车全液压制动系统通过整车测试和线路装车考核,运行良好。     

多级恒流充电方式及实现

介绍用多级恒流法对蓄电池的过放电进行充电的方式，着重阐述了多级恒流方案和驱动控制。     

新型电磁铆枪放电线圈研制

分析了现有放电线圈存在的问题，通过实验对不同制冷方法的散热效果进行了分析，提出以压缩空气为制冷源的散热系统，设计出新型放电线圈。     

开上航母甲板的“工程机械”（二）舰载航空保障车辆技术的发展趋势

相较美英等老牌海军强国，虽然我国起步较晚，但在科学技术层面拥有后发优势。从20世纪90年代开始，我国就逐渐研制成功了一系列具有中国特色的有杆和无杆飞机牵引车、挂弹车和其他机场地面保障设备，它们普遍应用了这一领域中最先进的核』懒术，在这些成果的基础上研制的我国新型舰载航空保障车辆将对外军许多现役的老旧装备形成代差。同时，在整个舰载航空保障车辆体系的规划和设计上，我们可直接以模块化、车族化的理念将保障车辆纳入系列化、通用化和标准化的优化体系j根据我国工程机械等相关产业的现实基础，将它们的研发和生产统筹于军民通用技术的总体规划之中，达到又好又省的效果。     

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.     

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。     

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....     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.