小型电驱气动剪枝机的多功能化研究

现在市场上的剪枝机基本上都是柴油动力的,基于柴油动力机器笨重,污染较大,能耗较高,研究研制一款多功能电驱气动剪枝机。     

气动技术在果树修枝剪中的应用研究

气缸是气动技术中最基础的元件之一,其应用在果树修剪枝作业领域便出现了气动修枝剪.它主要由活塞、活塞杆、开关阀、剪刀组件等组成.其最新产品还应用了串联双气缸工作原理,可以在气缸直径有限的情况下增加推力.     

新型气动压药机的研究

详细介绍了新型气动压药机的结构、工作原理和气动系统。新型气动压药机采用全气路控制,提高了火工品的压药精度和生产效率,大大减轻了操作人员的劳动强度,已经在火工品行业得到了广泛的应用和推广。     

贴片电阻排条机气动系统

介绍了气动系统在排务机的中的运用。对该设备的工作原理和气动系统作了详细的介绍并给出了气路图。     

贴膜机气动装置参数设计

针对某贴膜机的气动装置部分进行了设计。介绍了气缸的种类,对气动装置的参数进行设计,包括箱盖气动装置参数设计、滚筒升降气动装置参数设计、夹具松紧气动装置参数设计。分析了箱盖气动装置、滚筒升降气动装置、夹具松紧气动装置所需气压的大小,计算了气缸的主要参数,并算出了所需气体的体积。为贴膜机的气动装置参数设计提供理论支持与设计参考。     

纸箱包装机气动系统的设计

纸箱包装机是饮料生产线中的主要设备之一，它代替了手工装箱并极大地提高了生产力。该文主要介绍了纸箱包装机气动系统的设计，包括纸板供送作业回路、纸箱成型装箱回路、喷胶封箱整型回路设计。实验结果表明该气动系统的设计是可行的，用可编程控制器控制安全、可靠。     

铝铸锭线上扒渣机的改进

介绍了扒渣机的基本原理，运用气动系统动力学的相关理论分析了它的动态特性，阐述了扒渣机产生振动冲击的主要原因和消除这些振动冲击的方法，对国产铝连续铸锭线的扒渣机具有重要价值。     

16B双面研磨机的气动控制系统

介绍的16B双面研磨机采用气动控制与PLC组成的电、气控制系统,实现研磨压力的精确控制,并介绍了其气动系统的工作原理及其特点.     

电连接器气动扣合机的设计

介绍了一种适用于某系列电连接器气动扣合机的开发过程,分析了总体设计方案、工作原理以及控制系统设计,详细讨论了气动系统的组成、扣合过程及送料过程的工作原理,实践证明该气动扣合机的设计是合理的,有良好的使用价值.     

1420 铝箔分卷机压平辊的气动控制

对１４２０铝箔分卷机压平辊气动控制系统的思想及操作作了简单介绍与分析,希望能帮助现场操作人员更好地熟悉分卷机压平辊的控制,了解整个气动控制系统,便于现场的使用与维修。     

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.     

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....     

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。     

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.