斜拉桥缆索检测机器人爬行机构中拉簧的设计

提高斜拉桥缆索检测机器人对缆索表面的夹持能力是改善机器人工作可靠性研究中的一个非常重要的内容。根据这一需求,介绍了缆索检测机器人的爬行机构,重点对爬行机构中上、下推杆的拉簧进行了设计和验证,并通过样机试验,证明了上、下推杆拉簧工作的可靠性,为提高缆索检测机器人的夹持能力,以及改进机器人总体性能提供了一定的参考依据。     

缆索爬行机器人结构设计与动力学仿真

以实现缆索无损检测为目的,提出了一种用于携带缆索检测仪器的新型缆索爬行机器人的本体结构方案。机器人整体采用框架式的结构,其最主要的特点是实现了机器人爬行状态下调节抱缆力的功能。建立了抱缆力调整装置的数学模型。在AD.AMS中进行了动力学仿真分析,得到了机器人的动力学特种曲线。     

利用Pro/E的缆索检测机器人连接支架的优化设计

连接支架是斜拉桥缆索检测机器人中的关键部件,直接影响到斜拉桥缆索检测机器人工作过程中的安全性和可靠性.利用Pro/E软件建立了缆索检测机器人连接支架的三维模型,采用Pro/Mechanica模型分析软件对连接支架进行应力、应变和灵敏度分析.在确定了连接支架结构的重要设计参数后,以轻型化为目标,对连接支架进行了优化设计及仿真分析.仿真结果表明,优化后的连接支架在保证应力和应变符合要求的前提下,达到了减轻重量的优化设计目的,对检测机器人的整体优化研究具有重要意义.     

一种轻型斜拉桥缆索检测机器人的结构与动力学分析

针对目前迫切需要斜拉桥缆索检测自动化而设计的一种轻型缆索检测机器人,分析了总体结构方案和特点.在此基础上进行动力学分析,综合考虑机器人向上爬行和向下爬行的运动要求,推出了机器人的驱动条件和附着条件,并进行了电机初步计算.     

气动蠕动式缆索爬升机器人的基本结构

提出用气动蠕动式爬升机器人自爬升缆索对其进行检测和维护的新思想。介绍基本结构和运动方式,讨论速度控制的工作原理和实现方法,并对机器人沿柔性缆索爬升和高空作业进行了实用化分析。     

斜拉桥缆索缺陷检测机器人的研制

为保证斜拉桥的安全使用,对其缆索进行无损检测是非常重要的。本文论述了包括检测传感器、爬行机构和控制系统的斜拉桥缆索缺陷检测专用机器人。     

缆索Ⅰ号机器人样机爬升机构的分析及试验

高空缆索的有效维护一直是困扰斜拉桥管理者的问题。提出了采用缆索维护机器人来实现对缆索的自动维护。通过不同爬升机构模型的分析及试验,研制了适于螺旋六棱柱缆索爬升的缆索Ⅰ号机器人样机,解决了机器人在任意倾斜度缆索上爬升的难题,为特种机器人在极限环境中的应用开辟了新的领域。     

大直径缆索检测蛇形机器人单环攀爬研究与实现

提出了一种可用于大直径桥梁缆索检测的单环攀爬蛇形机器人。对其控制方法进行设计和优化,使所设计的机器人对圆柱体有良好的攀爬能力。蛇形机器人采用正交关节,对蛇形机器人控制函数法进行分析,提出一种闭合单环翻滚攀爬运动控制函数。根据单环攀爬的特点,设计攀爬辅助装置,实现了对大直径缆索的攀爬运动。     

蠕动式缆索机器人模糊故障树分析与应用

运用模糊故障树理论建立了以完成攀爬作业的机器人总故障为顶事件的故障树,计算了样机系统发生故障的模糊概率,对蠕动式缆索机器人进行定量分析,得出在不同置信水平下蠕动式缆索机器人发生故障的概率区间值,解决了传统故障树分析无法解决的基本事件——难以精确赋值时的故障分析,使得维修人员对缆索机器人的故障诊断从单凭经验的盲目诊断上升到理论化和系统化高度,为提高蠕动式缆索机器人的可靠性水平提供了依据。     

一种新型爬缆机器人的越障能力及夹紧机构分析

在深入研究国内外典型爬升机器人结构的基础上,针对目前斜拉桥跨度增大、缆索增多的趋势设计了一款检测效率高的新型爬缆机器人。通过对新型爬缆机器人正常爬行和越障时的动力学分析,得到了影响机器人越障能力的主要因素,据此对机器人的压紧机构进行了优化设计。为了增加新型机器人工作时的可靠性,提出了丝杠驱动直线导轨的夹紧机构并对丝杠进行了受力变形分析,分析得到这种机构可以解决丝杠的变形失效问题。该机器人结构简单、可靠性高、易于拆卸,对缆索直径的适应性强,有良好的越障性能。     

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.