齿轮脉冲电化学光整加工控制系统的研究

针对齿轮的脉冲电化学光整加工的实际特点。设计了一套基于上下位机结构的微机控制系统。阐述了工艺的控制原理。介绍了系统的结构组成和软件模块的设计。对步进电机的控制和微机间的通信技术做了重点阐述。该系统改善了光整加工的质量。提高了生产率。适合了大批量生产的需要。     

计数器回零机构

本文简介了回零机构的工作原理。确定了回零凸轮廓线的解析方程及其基本参数。探讨了凸轮的测量方法。分析了凸轮及其推杆的受力并研究了其自锁区。根据不自锁的要求解决了推杆外廓的设计问题。     

制造工程技术与制造科学(一)

发展先进的制造工程技术，需要制造科学的支持。论述了当代制造工程技术的特点。探讨了世纪之交制造业内外正在发生的主要变化。阐述了今日制造工程学科面对的挑战。回顾了制造科学的历史发展。探讨了制造科学的研究现状。介绍了制造科学研究的两项成果。     

适用于中小型链条热水炉的模糊控制

根据实际经验和采集的现场运行数据确定了模糊控制规则,设计了模糊控制器。详细地阐述了该控制器的设计方案和实现方法,针对设计做了详细的分析说明。使用了先进的控制算法实现了锅炉的自动控制。本系统成功用在了工业实际项目中,效果良好。     

轴的可靠性设计CAD方法

本文讨论了轴的可靠性设计CAD 方法。文中提出了轴的疲劳强度可靠性设计CAD 程序的编制原则,并给出了相应的CAD 程序和应用例子。这种可靠性CAD程序简化了计算,节省了时间,提高了设计质量,减少了轴的尺寸。     

PLC在变频恒压热水供应控制系统中的应用

本系统采用FX2N系列PLC设计了一套变频恒压热水供应控制系统。阐述了系统主要的工艺原理。设计了系统流程图。完成了手动档和自动档的程序编制过程。最后设置了报警系统并进行了触摸屏画面制作。试验证明本系统能够达到高效的控制作用。     

基于PLC的折弯机自动控制系统的研制

为提高伺服电机的定位精准性,充分利用了PLC作为逻辑控制器可靠性高的特点,设计了一种能够精确控制折弯角度的折弯机控制系统。介绍了折弯机的工作原理,提出了基于PLC、伺服系统、文本显示器的控制系统的解决方案。详细阐述了折弯机的工作流程,给出了硬件接线原理图以及折弯机控制系统的算法。通过一个程序实例,进行了折弯机的自动控制系统的模拟实验。实验结果表明,设计满足了系统的要求。     

超声波金属焊接机气动回路及PLC控制系统的设计

对用于铜箔和铜管连续缝焊的超声波焊接机的气动和控制系统进行了设计分析。根据焊接工艺,拟定了气动回路,进行了气动元件的选择计算,确定了管道直径,验算了压力损失。拟定了PLC控制流程并对控制端口进行了分析,编写了控制程序,实现了铜箔和铜管的自动焊接。     

耐辐照多节潜望镜光学设计

本文对最近研制成功的耐辐照多节潜望镜光学系统的设计工作进行了论述。给出了总体光路安排和初始参数计算。着重对光学系统的像差特性进行了分析,针对其特殊性。给出了像差平衡方案。绘制了像差曲线,给出了潜望镜光学系统的测试结果。     

中大马力推土机松土器结构优化设计

介绍了推土机松土器的结构形式及作业特点。设计了新结构松土器并绘制三维模型。对比了新结构松土器与传统松土器,介绍了新结构松土器的优点。对新结构松土器在两个工况下的载荷情况进行了研究,基于计算载荷,对松土器进行了动力学仿真。通过仿真,得到了油缸和连接点的最大受力工况。基于仿真结果,对松土器关键部件进行了有限元分析,得到了关键部件的最大应力值和最大变形量,分析结果显示,新结构松土器强度满足要求。应用Pro/E对松土器的最大提升高度和最大下降深度进行了模拟。对比了新结构松土器与传统松土器的作业速度,结果显示,新结构松土器的作业速度要优于传统松土器。思路为类似产品的改进提供了借鉴。     

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.