国产新型KY310牙轮钻机

了解国内外牙轮钻机发展史,根据目前国内外牙轮钻机的技术水平,设计研发国产新型牙轮钻机,采用全新控制系统和驱动方式,实现牙轮钻机多功能化,高效化,以达到世界先进技术水平为目标。主要介绍了新型牙轮钻机的主要组成及其技术特点。     

浅谈国内外牙轮钻机的现状及发展趋势

介绍了牙轮钻机的起源与发展,分析了国内外牙轮钻机的现状及主要厂家的技术特点,提出了未来牙轮钻机的发展方向。     

牙轮钻机主参数分析及其合理选择

分析了影响牙轮钻机钻孔速度的主要因素,提出了钻机主要工作参数的确定方法。牙轮钻机的工作参数是设计钻机的主要依据,也是合理使用钻机的依据。     

PC，PLC与变频器的串行通信控制开发及应用

介绍了在计算机＋PLC＋变频器的控制模式下,如何利用MODBUS协议和自由通信协议实现计算机与PLC、PLC与变频器的通信;开发了计算机与PLC和PLC与变频器之间的通信控制程序。     

基于PLC与变频调速的中水处理系统

利用PLC与变频器控制设计了中水处理系统,介绍了选用PLC及变频器的原因,强调了该系统的先进性。水池液位决定水泵的启动与停止,具体由PLC执行,运行过程水泵的速度由变频器控制。采用PLC控制与变频调速,节能效果与经济效益显著。     

基于RS485的PLC与变频器通信实现

本文介绍了PLC控制变频器的常用方法,并以三菱PLC及变频器为例具体介绍采用RS485实现PLC与变频器间通信的方法及过程。     

基于遗传算法的牙轮钻机回转减速器优化设计

以中心距最小为目标 ,应用遗传算法对牙轮钻机回转减速器进行了优化设计。应用结果表明 ,该算法是解决牙轮钻机回转减速器优化设计问题的有效算法。     

DSP在牙轮钻机回转电机控制中的应用

介绍了牙轮钻机回转电机控制特点，设计了以DSP与单片机相结合的钻机回转电机控制系统，介绍了系统的硬件结构和软件设计算法，实际运行证明该系统具有良好的动态性能和较高的速度控制精度。     

基于触摸屏与变频器直接通讯的一种控制系统

在工业自动化控制系统中,为实现人机界面控制变频设备的自动化运转,目前通常通过触摸屏—PLC—变频器,利用PLC编程来控制变频器的运行。这种控制系统中要用多种PLC功能模块,还要有多个辅助继电器,接线复杂,成本高,现介绍一种控制方法,省掉PLC、各种模块和继电器,用触摸屏直接控制和监控变频器运行。     

牙轮钻机中空轴的机械加工工艺分析

中空轴作为牙轮钻机上的核心零件,它在复杂工况下的工作性能,直接影响到牙轮钻机的产品性能和工作效率.文中通过对牙轮钻机的工作环境、工作性质、钻孔原理进行综合分析,从而对中空轴的材料选用、结构设计及制作加工过程中的热处理工艺、机械加工工艺都进行了优化,并制定了中空轴科学合理的机械加工工艺规程.     

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.     

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.