少齿差行星齿轮传动在小转矩核级阀门电动装置上的应用

通过SDZH小转矩多回转核级阀门电动装置的成功开发实例,详细地介绍了2Z-X(Ⅰ)型少齿差行星齿轮传动的优点,并进行了传动比、传动效率和齿廓重迭干涉的计算;分析了零件加工误差对齿廓重迭干涉的影响,提出了采用中心距正偏差以及适当加大齿顶圆直径偏差来弥补加工误差对齿廓重迭干涉的影响,为小转矩核级阀门电动装置工业优化设计提供了参考。     

核二级电动闸阀抗震分析

应用有限元分析方法对核二级电动闸阀进行抗震分析与评定.先计算阀门整机的固有频率,然后采用等效静力方法计算阀门在承受地震载荷及设计组合载荷共同作用下的应力,然后根据ASME规范作出应力评定和强度校核,从而验证核二级电动闸阀在SSE地震载荷及设计组合载荷作用下的结构完整性.     

核级电动闸阀抗冲击性能数值模拟

为研究核级电动闸阀的抗冲击性能,建立了受设计压力、温度及设计冲击加速度等载荷共同作用的核级电动闸阀有限元模型.利用ANSYS分析软件,对该阀门进行模态分析,结果表明可采用等效静力法分析阀门的抗冲击性能.基于等效静力法,分别分析了阀门在组合载荷冲击作用下的谐响应及静力学特性.谐响应分析结果表明,闸阀系统在承受按简谐规律随...     

转矩控制开关运动输入型式比较

给出了常用的两种转矩控制开关控制输入型式，分析了各自的特点及对电动装置输出转矩的影响，讨论了转矩控制开关运动输入型式与阀门电动装置相关部位，部件的关系，同时提出了结构的设计要点。     

核级阀门电动装置用直流电动机设计

论述了第三代压水堆核电站采用非能动设计,直流电动机驱动核级阀门电动装置的工作性能和结构特点,介绍了直流电动机设计制造的技术特性和设计程序,给出了核电站环境核级阀门电动装置用直流电动机的控制过程和简化的驱动回路。     

牙嵌离合器式转矩控制机构的性能试验

根据牙嵌离合器式转矩控制机构控制阀门电动装置输出转矩大小的实测结果，分析了该机构存在的问题，提出淘汰该产品结构的意见     

少齿差行星齿轮传动在小转矩核级阀门电动装置上应用

通过SDZH小特矩多回转核级阀门电动装王的成功开发实例,详细地介绍了2Z-X(I)型少齿差行星齿轮传动的优点,并进行了传动比、传动效率和齿廓重迭干涉的计算;分析了零件加工误差对齿廓重迭干涉的影响,提出了采用中心距正偏差以及适当加大齿项圆直径偏差来弥补加工误差对齿廓重迭干涉的影响,为小转矩核级阀门电动装置工业优化设计提供了参考.     

阀门电动装置寿命试验规程(报批稿)

本规程适用于电动机传动,电接点控制的阀门电动装置(以下简称电动装置)的整机寿命试验。1.定义1.1 最大控制转矩当转矩限制机构调到满刻度时,逐渐增加电动装置的输出转矩,直到转矩限制开关动作,此时的输出转矩值称为电动装置的最大控制转矩。为避免动能的影响,该值需在缓慢加载情况下检测。     

基于NASTRAN求解器对核级阀门抗震分析技术路线的探讨

按照相应法规标准,基于NASTRAN求解器对某核级电动阀门进行了抗震计算及抗震分析,寻求了计算机模拟分析核级阀门抗震的一般分析方法,同时验证了阀门在设计压力、设备自重、接管载荷及地震载荷的共同作用下阀门边界的完整性.     

核级阀门电动装置鉴定要求及试验的分析

介绍了不同时期有关工程核级阀门电动装置鉴定的技术要求,分析了核级阀门电动装置的相关标准及技术规范,给出了鉴定试验的项目程序、操作要求及研究结果.     

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.