卷簧机数控系统的开发

针对国产卷簧机技术现状，设计了一种基于PMAC卡的卷簧机数控系统。给出了数控系统整体结构，详细介绍了其硬件、软件的构成与功能，简述了软件的编程思路，分析了PID参数的调整过程。实践表明：该系统能满足卷簧机的高定位精度和快速响应的要求。     

数控系统在卷簧机电气控制改造中的应用

在简要阐述卷簧机原有控制方案的基础上,指出了其中存在的问题及解决的途径,提出了使用SINUMERIK 802Cbl数控系统对卷簧机电气控制系统进行改造的方案,并从整体方案确定、电气控制系统设计、PLC程序设计以及加工程序的参数化设计几个方面阐述了SINUMERIK 802Cbl数控系统在卷簧机电气控制改造中的应用.     

四轴联动卷簧机数控系统开发

为了加工具有复杂结构的弹簧零件,设计了一种具有开放式体系结构的多轴联动自动卷簧机数控系统。为了提高系统的运行速度、稳定性和实时性,采用了前后台的软件结构分别完成实时性和非实时性任务。为了实现上位机和运动控制器的成功通信,提出了在LabVIEW中利用ActiveX自动化技术的方法,确定了系统由前台实时控制程序、后台管理程序、通信驱动程序和PLC程序等部分组成。开发出了自动卷簧机四轴联动数控系统,并通过该系统进行了单头尖弹簧的加工实验。实验结果表明:该系统稳定可靠,具有一定的开放性,人机界面友好,能够满足自动卷簧机系统的控制要求。     

集成化数控系统在高速六轴数控卷簧机的开发应用

弹簧制造业随着我国机械电气工业的不断发展,品种逐渐增多,数量不断增加。目前数控卷簧机的控制系统主要采用数控加工中心的五轴系统,控制电路,数据处理单元与卷簧机械的执行部件结合尚不理想;存在着价格昂贵、功能不全等缺陷,而且操作界面复杂,使用不便。通过研制集成于数控系统内部的多功能接口功能模块,将CAD／CAPP／CAM软件集成于数控系统内部,研制出六轴卷簧机数控系统,其操作性和功能性优良,不仅能充分满足高速卷簧机数控化需要,且具有高性价比。     

802CBL在数控3轴卷簧机中的应用

数控卷簧机在弹簧加工企业中得到了广泛的应用,而且可靠、稳定的控制系统成为了研究的重点。阐述了SINUMERIK 802CBL数控系统在数控卷簧机中应用的具体设计思想和实现方法。介绍了SINUMERIK 802CBL良好的速度控制性能。研究结果表明,以及强大的NC＆PLC编程功能。研究结果表明,SINUMERIK 802CBL数控系统的开发为卷簧机的控制开辟了一条新的途径。     

基于PROFIBUS总线的数控系统在数控卷簧机中的应用

阐述了基于PROFIBUS总线的SINUMERIK 802DBL数控系统和其相关的设备与部件在数控卷簧机中应用的具体设计思想和实现的方法，介绍了SINUMERIK 802DBL数控系统控制所实现的宽的调速范围、高的稳定精度、快的动态响应等良好的技术特性，SINUMERIK 802DBL数控系统的开发与研制为卷簧机的控制开辟了一条新的途径。     

8mm五轴数控卷簧机

研制出我国第一台8毫米数控卷簧机，对其五轴数控系统的功能和软硬件结构做了介绍。     

具有弹簧CAD功能的五轴卷簧机数控系统研制

针对通用数控卷簧机对编程调试人员要求高,调机时间长等现状,设计了一套具有弹簧CAD功能的五轴数控系统。文中给出了该系统整体结构,详细介绍了其硬件、软件的构成与功能,简述了软件的编程思路。实践表明:该系统不仅满足卷簧机的高定位精度和快速响应的要求,而且在更换加工品种时,对调试人员的经验要求降低,新品调试时间明显缩短。     

基于IPC的全自动电脑卷簧机数控系统的设计

根据弹的加工和成形要求,设计出一个专用于自动卷簧机的五轴联动数控系统,结合不同的功能接口板,系统采用工业控制计算机完成各单轴实时位置控制,同时由计算机在后台完成人机交互等管理功能,从而简化了设计,文中详细介绍了诉组成及实现。     

新式微型连续卷簧机

新式CNC数控微型连续卷簧机适用于生产各种节距圆钢丝卷簧,也可生产扁钢丝卷簧。卷簧机具有非凡的工作特性,卷簧点可以进行径向和横向调节。     

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.