基于PLC的液压挖掘机模型控制系统设计

通过对现有的液压挖掘机模型加装电磁换向阀、角度传感器、触摸屏、可编程控制器以及上位计算机,使其成为集机、电、液控制为一体的综合实训设备。此实训设备既可以完成机电一体化技术的综合控制实训,又可完成液压、传感器、可编程控制器以及组态控制等机电一体化关键技术的实训。     

可视化三菱e-f@ctory自动生产线在实训教学中的应用

可视化三菱e-f@ctory自动生产线是集机械设计、气动驱动、液压控制、多种传感器控制技术、机器人、数控、PLC控制、物流管理、伺服驱动以及CC-LINK现场总线技术于一体的,以采用三菱电动机控制系统为基础的机电综合实验实训设备.介绍了可视化三菱e-f@ctory自动生产线组成以及如何用于一系列机电一体化实验教学,全方位培养工科院校学生机械设计能力及机电类专业学生机电综合的应用能力,使学生成为合格的集机械与电子技术于一身的创新型人才.     

基于模块化控制系统在一体化教学中的应用

随着计算机技术迅猛发展和广泛应用,机电一体化技术获得前所未有的发展.应用某公司开发的机电一体化实训设备,实现模块化生产制造过程中“供料检测工作站”控制任务,并运用于技工院校一体化教学中.旨在激发学生的学习兴趣,同时也使教学内容更具有针对性及互动性,提高学生的综合职业能力和职业素养,更能适应社会和企业的需求.     

电液比例综合教学设备设计开发

针对高职院校液压实训室现有设备大部分以回路搭接训练类型为主,缺少与企业现场对接的自动化、智能化的综合液压设备的问题,设计开发了一种集电液比例控制技术、传感器技术、PLC控制技术于一体的电液比例综合教学设备.设备所用元件均为企业现场实际使用的元件和叠加式连接方式,使学生的学习更贴近企业现场,满足了机电类专业学生液压气动课程、机电综合实训等课程专业教学的需要.     

浅谈机电一体化教学实训设备的设计

对目前我国机电一体化实训设备的发展和设计理念进行了叙述,包括：技术要求、教学特性、技术标准、技能规范和教学资源等方面。以两单元式机电一体化实训设备的设计为例,具体说明了机电一体化实训设备的设计要点。     

论检测传感技术在机电一体化中现状、应用及其发展

以传感器为核心的检测系统就像神经和感官一样,源源不断地提供种种信息,以便机电一体化系统能高精度地完成自动控制和自动调节功能.本文描述了传感器技术在机电一体化系统中现状及其应用状况,并指出了传感器技术发展的若干问题及今后的发展方向.     

论检测传感技术在机电一体化中现状、应用及其发展

以传感器为核心的检测系统就像神经和感官一样,源源不断地提供种种信息,以便机电一体化系统能高精度地完成自动控制和自动调节功能.本文描述了传感器技术在机电一体化系统中现状及其应用状况,并指出了传感器技术发展的若干问题及今后的发展方向.     

机电一体化技术在液压挖掘机中的应用探究

液压挖掘机在我国的建筑施工方面是极为重要的施工设备。机电一体化技术的发展,以及在液压挖掘机中的应用,这些技术的进步和革新,对于挖掘机的发展而言,都是极为重要的。机电一体化技术对传统的挖掘机而言,是一门比较新的综合性高新技术。该文分析了机电一体化技术在液压挖掘机上的应用与发展,以及我国的机电一体化液压挖掘机的发展情况。     

从机电一体化看液压技术的新发展

机电一体化技术的发展,促使用户对液压元件及系统的发展提出新的要求,促进了液压技术向机电液一体化发展。机电液一体化液压元件及系统陆续问世,一体化液压元件如电液控制变量泵、电液控制液压阀、电液控制的液压马达与液压缸、多种传感器及接口装置等;电液系统的微机控制和工况监测多有应用;微机控制电液系统     

基于单片机控制的液压泵站设计研究

介绍了用传感器和单片机检测控制液压泵站,使其按用液工况实现数字化、智能化运行,达到节电、减少设备故障、延长设备使用寿命的目的。     

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.