气动机械复合传动双工位冲压机分析

文章主要是基于研究者们以往的研究成果，对机械负荷传动冲压机进行了分析，该冲压机主要是以气动双滚轮二级力放大机构为基础的。该冲压机的主要优势在于能够在一定的空间范围内，更加有效的将推力传送到冲压头之上。因为该冲压机充分发挥了杠杆原理的放大作用以及双滚轮结构中角度效应。换而言之，就是通过活塞杆的作用，在一定的条件之下可以大幅提升冲压机的压力。相反，得到相同冲压力的情况下，本结构可以对气缸的直径进行一定的缩减。本文中的冲压机在使用一个气缸的情况下，就能完成两个冲压头的工作流程，一方面大大提升了工作效率，另一方面也能降低能耗，对环境的保护做出了一定的贡献。     

基于无杆活塞气缸与杠杆-双滚轮二次增力机构的复合传动装置

介绍了一种基于无杆活塞气缸与杠杆-双滚轮二次增力机构的复合传动装置的工作原理,给出了其力学计算公式.该装置结构简单;力传递效率高;在气缸直径一定的条件下,能显著提高输出力.     

基于三级串联力放大机构的气动夹具设计及应用

介绍了由三个角度效应串联作用的三级力放大机构与无杆缸组成的气动夹具系统,给出了其力放大系数和输出力的计算公式.该三级力放大机构具有结构简单、布置紧凑的优点,将其应用于气动夹具中,能够显著减小气缸的直径.或是在气缸直径相同的条件下,夹具的输出力得到了明显的提高.     

气动肌腱驱动的杠杆-双滚轮式二次增力机构

介绍了一种以气动肌腱为驱动力的杠杆-双滚轮式二次增力机构的工作原理,给出了其力学计算公式.该装置结构紧凑,能对输入力进行高倍放大后输出.     

气动肌腱驱动的肘杆-杠杆增力双工位并行高效夹紧装置

创新设计了一种由气动肌腱驱动的基于肘杆和恒增力杠杆的角度和长度力放大效应的双工位高效夹具。该机构用结构极为简单、柔性好、输出力与直径比大、输出力与重量比高的气动肌腱来代替传统的刚性气缸,通过与传统气缸驱动方式相比较,发现其夹紧效果更显著,系统结构更紧凑,同时符合绿色节能新理念,值得推广。     

具有三级力放大机构的气动夹具设计及应用

设计了一种由三级力放大机构和无杆缸组成的气动夹具系统,力的放大基于三个角度完成。该三级力放大机构具有结构简单、布置紧凑的优点,将其应用于气动夹具中,能够显著减小气缸的直径;或是在气缸直径相同的条件下,使夹具的输出力得到明显的增大。为解决气动夹具体积过大这一棘手问题提供了新的思路。     

基于双活塞固定气缸的铰杆-杠杆增力双点浮动夹紧装置

现有的铰杆-杠杆增力双点浮动气动夹紧装置,由于采用整体悬吊铰接式气缸,受力状况极差,且容易产生冲击和噪声。创新设计的具有同样功能的双点浮动夹紧装置,采用双活塞固定气缸与滚动高副铰杆-杠杆增力机构,显著改善了受力状况,运行平稳,使用寿命长。     

直线电机驱动的数控双工位卧式冲压机

创新设计了1种直线电机驱动的数控双工位卧式冲压机,对其组成情况、工作原理进行了介绍,并分析了其优点及其创新设计点,该冲压机能够实现力及行程的放大。此外,由于采用双工位同时冲压的方式,生产效率得以大幅度提高,采用卧式布局,相对于传统的立式冲压机床,重心低,稳定性好,具有比较广阔的应用前景。     

基于无杆活塞气缸的二级增压装置

介绍了一种新型的基于无杆活塞气缸的二级增压装置,分析了其工作原理,给出了输出力的计算公式.该装置结构简单紧凑,刚性好,在输出力及气缸直径大小一定的条件下,能显著降低系统的压力.     

基于新型二级杠杆机构微定位平台的设计与分析

针对传统杠杆放大机构在柔性平台构型设计中存在放大倍数低和响应速度较慢的不足,提出了一种新型二级杠杆放大机构,并在此基础上设计压电陶瓷驱动的单自由度微定位平台.根据柔性铰链的物理特性,通过差异化的铰链组合方式来实现并改善柔性平台的结构功能,进而综合设计一种具有敏捷响应速度和大范围输出位移的新型二级杠杆机构.基于拉格朗日定...     

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.