新型轴向供油回转配油器试制与应用

一、概述回转配油器（即回转接头体），是钢铁行业冶金液压机械上常用的一种液压输件。一般在钢卷机上使用较多。图1是其应用实例。其工作原理是：主机带动缸体回转运动，在旋转的过程中，液压系统通过回转配油器向缸供给一定的压力油对主机施力。此时，回转配油器，的主要任务是保证缸在旋转时对高压铁管无任何影响。二、径向供油田油留通常纵向卷取机上使用的转配油器，从供油方式上来看是径向供油的，故称之为径向供油配油器。这种配油器结构如图2所示。它是由1．外套、2．芯轴、3．滚动轴承等主要件组成。在芯轴上加工几道环形油槽通油…     

关于联合配油双向进油开路式径向柱塞泵的研究

关于联合配油双向进油开路式径向柱塞泵的研究王宝华在一个液压油源中往往使用着多个泵。若能用一个泵代替多个泵，则可以克服液压油源中油泵遍地、管道纵横、泄漏严重、占地面积甚大的缺点。本文介绍的一种联合配油双向进油开路式径向柱塞泵，不但可以克服油源中的上述缺...     

间接供压力油配油转台在机械设备上的应用

为扩大液压(或气压)自动夹具的应用领域,解决自动夹具在和工件一起连续回转时供油(或供气)管路的缠绕问题,研发了配油转台产品,经生产应用解决了回转自动夹具的供油(或供气)管路的缠绕问题.此一方法也可以在间接供油的机械设备上采用.     

钻机配油套试验装置设计与密封机理分析

配油套是全液压动力头式钻机中的重要密封元件,其密封性能直接影响钻机液压系统容积效率,实际操作中通常根据配油套的泄漏量来检测其密封性能。通过分析其密封机理,设计了配油套密封性能试验装置,该装置结构新颖、操作简便、测量范围广。通过试验分析,得到了适合钻机的配油套最小厚度比。实践证明,该装置的应用可完善配油套的检测方法,有效提高钻机液压系统容积效率。     

深孔钻镗床受油器改进

针对受油器在使用中压力油泄漏问题,对受油器回转密封套进行了改进,由原来的回转密封套刚性接触工件密封,改为回转密封盘球面摆动柔性接触工件密封。     

轴向柱塞泵配油副的优化设计

正确设计配油副,使它在工作中能始终保持有稳定的油膜是轴向泵设计中的关键问题之一。本文依据理论分析和经验数据导出一个优化设计方法,在给定了泵的设计参数后利用计算机可以迅速算出配油副的主要结构参数。     

径向柱塞式液压马达配油机构的流场特性分析

配油副对于液压马达的性能有着直接的影响,因此,配油副的计算与分析是很有必要的,当下,我们采用的是现代有限元技术,对配油副的流场特性进行研究。本文从对当前国内外液压马达的研究现状入手,进而介绍了径向柱塞式液压马达配油原理、数值计算基本方程及方法,最后对配油副内部流态及流动特性数值进行了深入的分析。     

汽车发动机配气机构仿真分析

虚拟样机技术是当前设计制造领域的一项新技术.它利用软件机械系统的三维实体模型和力学模型,分析和评估系统的性能,从而为物理样机的设计和制造提供依据.本文使用机械系统动力学仿真软件ADAMS,以D6114B高速柴油机的配气机构为例,建立和测试了该机构的虚拟样机,对下置凸轮轴高速发动机配气机构的性能进行了分析、预测.     

二维柱塞泵缸体配油口对称度测量机理研究

为了确定二维柱塞泵缸体配油口对称度的测量方法,基于海克斯康三坐标测量仪分别使用定义法及推荐法对缸体配油口进行测量,并对二维柱塞泵的工作原理和两种方法的测量结果及对称度测量机理进行分析。分析结果表明:定义法的对称度测量方式更符合二维液压泵的实际使用工况。     

转套式配流系统与阀式配流系统性能对比研究

往复柱塞泵的结构体积、容积效率和脉动特性是其重要的性能指标,决定了柱塞泵在实际应用中的空间占用、机械效率、使用寿命和噪声产生等问题。针对传统往复柱塞泵采用的阀式配流系统与新型的转套式配流系统,在体积结构、压力脉动和容积效率3个方面进行对比研究。将两种配流系统设计为相同的额定输出流量、额定输出压力和额定工作转速,并将其体积进行比较,对转套式配流系统在Fluent软件中进行仿真,并将其脉动情况和容积效率与阀式配流系统进行对比分析。结果表明:转套式配流系统在结构体积和压力脉动方面均优于阀式配流系统,在额定工况下,转套式配流系统的容积效率较高,且表现稳定,当工作转速较大时,其容积效率急剧下降。     

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.