基于LabVIEW的电液伺服系统的设计与实现

设计了基于LabVIEW的电液伺服测控系统。系统通过传感器,数据采集卡,以及LabVIEW的PID工具包,对采集的数据进行实时分析和处理,最后达到对伺服油缸位置的控制。系统具有人机交互性强,控制精度高,稳定性好,使用方便等优点。     

基于ARM微处理器的实时采集和控制

介绍了以ARM9为核心,作为控制器对电液位置伺服进行控制的一种方法。控制系统中采用定时方式实现A／D转换器采集位移传感器的模拟信号,控制算法是PID控制并由程序实现,利用脉宽调制输出的方法对电液位置伺服进行控制。该控制方法已得到应用,效果稳定。     

六自由度伺服作动简及安全保护的研究

该文针对六自由运动系统伺服作动筒的组成及各组件功能进行了详细的阐述,并对运动系统伺服作动筒液压控制原理进行了分析,给出了位移传感器的工作原理,探讨了运动系统伺服作动筒接口控制原理,同时以伺服作动筒的运行速度错、位置错等为例对其安全保护软件设置进行了探讨,为飞行模拟机的六自由运动系统伺服作动筒的设计研究和性能提高提供了一定的参考.     

高精密划线分断机的定位技术

液晶基板玻璃从半成品到成品生产中,必须要经过精密切割和分断,在切割前应对玻璃进行定位。对基板玻璃在从上游输入到精密划线分断机时的定位进行探讨,定位控制系统主要采用三菱PLC的Q03UDE高性能CPU和QD75MH4系列伺服控制模块,通过其中的速度-位置切换功能实现切割前高精度的定位控制,降低了机械定位结构的复杂程度。     

基于内置传感器的大型数控机床状态监测技术

提出一种基于光栅尺、编码器、伺服进给电机电流(转矩)等内置传感器的机床状态监测系统,深入研究转矩、位置、润滑特性等内置传感器测试原理,就开放式和商业数控系统给出不同采集机床状态信息的策略;并进行多种工况下的恒速、润滑特性测试,试验分析表明电机输出转矩(电流)、位置、瞬时速度、瞬时加速度等内置传感器信息被用于机械传动部件故障诊断和伺服控制特性评估的可行性和有效性,从而为大型数控机床状态在线监测和故障快速溯源,提供技术支撑.     

运动控制及伺服、步进电动机：没有不可能——运动控制产业随想

一个运动控制系统包括了控制、驱动和传感部分,因此运动控制的范畴应该包括所有带有运动控制功能的控制器,各类执行伺服驱动功能的电机和驱动器,以及相配套的位置、速度和力传感器。     

基于MATLAB的电液位置伺服系统设计及仿真

电液位置伺服控制装置设计的重点和难点是建立电液位置伺服控制系统的数学模型和传递函数及开环增益系数的确定。通过设计一种数控机床工作台的电液位置伺服控制装置,对数学模型和传递函数的建立做了详细介绍,并在MATLAB环境下对电液伺服控制系统进行仿真,确定出使系统稳定的开环增益。同时应用频率响应法对电液伺服控制系统的性能进行分析,从而得到满足要求的可靠电液伺服系统参数和满足设计要求的稳定电液位置伺服控制装置。     

双工位自动涂胶系统的研制

介绍了根据用户要求所研制的自动涂胶系统,用于实现汽车ECU生产过程中的PCB板冷却胶涂胶及装配等工序的自动化生产。该系统采用了PLC技术、伺服定位控制及人机界面技术,实现了对涂胶轨迹的精确定位以及机械手动作的自动控制;应用自动化仪表及通信技术,使该系统具有自我检测的功能,保证了系统加工精度。实际应用证明,该系统具有精度高、可靠性强、操作简单等特点,提高了生产效率,满足了客户的要求,取得了良好的经济效益。     

汽车玻璃涂胶机器人工作站

本文介绍一种用于汽车装配生产线的玻璃涂胶型机器人工作站。其主要内容包括机器人及其控制、单轴回转变位机、翻转机械手、胶液供给系统、保温室等。这种工作站保证了涂胶的均匀性、一致性、准确的涂敷位置以及优良的生产质量。     

微机控制的节能液压系统

日本小松PC系列和日立EX系列液压挖掘机均采用微处理机控制。这是一种集成度较高的机电一体化产品。通过微机控制使该机工作时效率较高，在高压和低压卸荷时又能减少能量损失，达到了节能的目的。一、微机控制的液压系统小松PC系列和日立EX系列液压挖掘机的微机控制系统一般由变量泵、变量缸、电液伺服阀、泵阀控制器（PVC）、压力传感器和负荷压力传感器（图中未注）等组成，如图回所示。该系统可实现三个功能，即恒功率控制功能、CO功能和“零排量”功能。1．但切率控制切能为了最大限度地利用发动机功率，可采用恒功率控制原理。根…     

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.