两足步行爬壁机器人控制系统的研究

本文提出了一种新的具有七个自由度的两足爬壁机器人，该爬壁机器人具有重量轻，控制精度高，速度快等特点。     

基于MEMS微型爬壁机器人自主控制系统设计

介绍了一种基于MEMS永磁轮式微型爬壁机器人。研究多种因素限制条件下微型爬壁机器人自主控制系统硬件和软件的设计方法。控制硬件主要包括微控制器、电磁微马达驱动器、无线收发器、电源管理、微型摄像头等模块。设计基于嵌入式实时操作系μC/OS-II的模块化控制程序,对爬壁微机器人不同行为的控制方法进行了研究,包括运动控制、能源监测、图像采集、无线传输等。制作了相应的原理样机,通过实验证明了所设计控制系统的可行性。     

足式微型爬壁机器人机构及无线控制系统

爬壁机器人(climbing robot)集机械设计、电路设计、通信于一体。文章介绍的微型爬壁机器人实现了小体积和低质量,能在一定距离内进行无线控制。机器人整体尺寸190mm×180mm ×110mm,质量1．5kg。     

一种无线通信的立式油罐检测爬壁机器人研制

立式油罐是石油石化行业中最常见的存储设备,为此设计一种永磁轮式爬壁机器人(wallclimbing robot,WCR)代替人工对油罐进行无损检测。基于WEB的地面系统采用无线方式对爬壁机器人进行远程控制和信息查看,并将控制系统划分了多层结构来对WCR进行控制。采用了油罐表面全覆盖算法来对油罐表面进行全覆盖检测,通过仿真和实验室测试完成了预期效果。     

一种多吸盘爬壁机器人原型的研制

介绍了一种仿坦克的爬壁机器人原型设计，该机器人新颖之处在于采用多个吸盘组成的吸附机构和单链条爬行及转向机构，它可以在玻璃幕墙和船壳等墙面上连续爬行，并有一定的越障能力。主要阐述了爬壁机器人关键结构的设计、安全性分析、转弯技术和越障实现的设计思想，并简要对其控制系统进行了介绍。     

LPG球罐检测爬壁机器人远程控制技术研究

针对LPG球罐检测爬壁机器人远程控制的技术需求,研制了一种基于WiFi的无线远程控制系统,包括爬壁机器人机载系统和上位机监控系统.其中,基于ARM Cortex-M3内核的STM32F103型单片机开发爬壁机器人机载控制系统,通过WiFi方式与上位机监控系统通信,利用PWM控制方式驱动爬壁机器人电机转动;基于Visua...     

单吸盘爬壁机器人的吸附稳定性的分析及计算

提出并采用变动力矩轴的方法 ,建立了爬壁机器人系统力学模型 ,解决了爬壁机器人吸盘压力分布函数不可解的问题。并在此基础上 ,分析了爬壁机器人在匀速爬行时的稳定吸附条件 ,为在爬壁机器人设计过程中确定一些主要参数提供了必要的理论基础     

油罐容积检测用爬壁机器人控制系统研制

本文讨论了爬壁机器人的控制系统设计。该机器人为石油油罐测量专用机器人。文中阐述了该机器人控制系统设计需考虑的几个问题，介绍了该系统的软、硬件。     

爬壁机器人研究现状与技术应用分析

自1966年日本的A.NISHI设计出了基于负压吸附爬壁机器人样机以来,爬壁机器人技术在世界范围内得到了迅速的发展,无论从吸附方式、运动形式还是应用途径方面都有了长足的进步;在这近50年的发展历程中,形式各样的研究成果层出不穷,但是爬壁机器人研究成果的应用前景一直不容乐观,鲜有应用成果,大多处于基础研究阶段,陷入技术瓶颈中,结合国内外爬壁机器人研究现状,分析爬壁机器人研究中的技术难点,探讨未来爬壁机器人发展与应用前景。     

履带式船舶除锈爬壁机器人关键机构设计

研制了一种履带式船舶除锈爬壁机器人.该机器人本体和负载质量较大,对吸附机构的驱动性能要求较高.设计了爬壁机器人吸附机构,选择了磁性材料、确定了磁路结构并实现橡胶封装;设计了爬壁机器人传动机构,选择了传动方式,确定了链条张紧装置;选择了关键驱动部件.样机试验表明,爬壁机器人结构和工艺设计合理,工作状况良好.     

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.     

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....     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.