新型导向套、油封双工位压装设备

导向套压装机和油封压装机是汽车传动器生产装配中必备的两台专用设备。我所研制的新型导向套、油封双工位压装机具有合二为一功能。设备采用机电液一体化技术,双工位压装设计,具有结构紧凑,体积小,操作方便,维护简单等特点,同时,它还具有工作参数监控功能,提高了生产效率和产品质量。     

智能压装机的设计与研究

当前的机械装配中,对于大多数过盈配合装配均采用压装机,其中大多使用的是液压压装机,压装精度难以保证,而液压油泄漏很容易污染零部件及周围环境;也有极少数轻型过盈装配采用气压压装机,但其所提供的压装力较小。基于此,设计了一款中高端伺服压力智能压装机,能够满足精度要求,具有压力范围可调、清洁无污染、装配灵活性高等特点。     

汽车发动机缸盖导管、座圈智能柔性化压装技术的研究与应用

针对传统压装机生产效率低、压装精度低等问题,开展了对汽车发动机缸盖智能柔性化压装技术的研究与应用。在缸盖导管、座圈智能化压装设计的总体构思下,完成了多机种压装装置的结构设计;利用现代伺服电缸、工业机器人、自动上料系统、传感器、数字控制等技术,实现了压装过程的智能柔性化调节和控制要求,提高了压装精度和产品质量。     

卡环连接式导向套压装机的研制

大吨位液压支架立柱导向套的连接方式趋于卡环连接式,其导向套的压装是关键。卡环连接式导向套压装机的研制成功．降低了劳动强度,提高产品质量,从而满足了中厚煤层的综合机械化开采。     

一种等压浮动压装机构

设计了一种新型等压浮动压装机构,主要用来压装类似汽车轮毂上的一圈网纹螺栓。通过该压装机构,非常好地解决了此类零部件在压装过程中出现的一系列问题,如效率低,每次单颗压装以及整体压装时会出现部分压装不到位。     

汽车前桥主销与锁销安装用压装机分析

本文主要分析汽车锁销和主销压装机的构成,探究该结构的主要结构特点和工作原理。这样的压装机操作比较简单,比较适合汽车前桥大量生产的需求。     

汽车主减速器主齿轴承专用压装机设计

介绍了一种用于汽车主减速器主齿轴与轴承内圈装配的专用压装机。在理论计算压装力基础上,结合装配技术和工艺要求,进行了压装机整体方案设计,介绍了设备机械结构、液压系统、测控系统等功能模块设计,特别阐述了压装机的安全设计和压入曲线拐点自动识别等技术。设备可监控和记录压装过程中位移和力值,自动识别压入力,满足了产品装配中新的工艺要求,运行安全可靠、操作方便灵活,取得较好的使用效果。设备的开发为同类产品的研发和升级改装提供了技术支持和参考。     

基于AMESim的液压矿车悬挂系统研究

根据车辆行驶的评价指标,为提高矿车在凹凸不平路面行驶的平顺性,提出了液压悬挂系统,介绍了系统的结构、工作原理和液压系统原理图,并用AMESim仿真软件建立了仿真模型。仿真结果表明:液压悬挂系统可以有效地降低车身加速度、悬架动挠度和轮胎动位移,使车辆具有良好的行驶平顺性和操作稳定性。最后在多功能液压实验台上对伺服阀控液压缸的动态响应特性进行了实验,结果表明:所采用的液压悬挂系统能够满足矿车的使用要求。     

螺旋类SRD伺服压力机机型设计与分析

为了解决传统摩擦式螺旋压力机耗能高、控制精度差的问题,采用开关磁阻伺服电机减速驱动螺旋副换向,提出了SRD伺服螺旋压力机力能精确控制原理,说明了电动伺服螺旋压力机的锻造用、折弯用和压砖用机型结构,设计了摇杆式螺旋压力机的竖螺杆和横螺杆机型结构,并对其特性进行了比较.试验与分析表明,新型螺旋类SRD伺服压力机具备工艺参数数控精确的优势,在与摩擦压力机对比试验中,开关磁阻伺服电动螺旋压砖机达到了节能70%.此类压力机的不同机型能够满足不同行业的工艺需求,能够实现自动化、智能化生产的目标.     

轮式拖拉机悬挂系统的调节和使用

轮式拖拉机的悬挂机构均为三点悬挂式,拉杆的长度均可调节.但大多数机手在操作时,没能选择正确的连接位置和各部件的长度,影响了机械性能的正常发挥和作业质量的提高.     

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...     

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。     

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.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.