新型轮履复合式移动底盘设计与分析

本文提出了一种新型的轮履复合式移动底盘的设计方案,该移动底盘基于一种新型的轮履复合式变体轮技术。完成了对机器人遥控/半自主的嵌入式控制系统的设计,实现了实时性高、可靠性好的控制要求。结合几种典型障碍详细分析了机器人的越障过程和特性,分析表明,该新型轮履复合式移动底盘具有很强的环境适应能力和较高的越障性能。     

轮履复合式底盘研究综述

首先,总结了国内外主要轮履复合式底盘研究成果;其次,分析了轮履复合式底盘在结构设计、越障性能及运动分析的研究方法;最后,讨论了轮履复合式底盘研究中存在的不足,为后续轮履复合式底盘发展提供理论支持。     

轮-履-腿复合式移动机器人的越障分析

针对非结构化环境中轮履机器人越障能力不足的问题,提出一种新型轮-履-腿复合式移动机器人。基于动态位姿变换矩阵建立轮-履-腿复合式机器人运动学模型,针对该机器人特有的前后支撑腿结构,提出一种在非结构化环境下基于履-腿混合运动模式的新型越障方案,并对该越障方案进行约束条件分析,得出其在翻越障碍物时的非线性关系模型。     

新型全地形机器人结构设计及越障分析

进行了一种新型全地形机器人的机械结构设计与越障功能分析。该机器人采用轮履复合式的结构设计,并可根据不同路况的要求实现轮式移动与履带式移动的快速变换以调整其运动状态。分析了该机器人通过斜坡和楼梯的越障过程。最后进行Pro/E仿真和实验,仿真及实验结果表明,该机器人可适应多种复杂路况,且具有良好的越障能力和机动性能。     

轮履变结构反恐机器人设计及运动学分析

针对轮履复合式反恐机器人轮和履带分开设计,结构不紧凑的问题,提出一种轮履变结构反恐机器人新型机构设计。轮式移动和履带式移动可相互转变,使机器人具有机构可重构的特点,从而使机器人体积减小,结构更加紧凑,既能采用轮式方式快速移动,又能采用履带方式进行越障。通过对机器人进行运动学分析和在RecurDyn软件中进行越障仿真研究,验证了机器人的越障性能,同时为后续机器人实验研究提供了理论依据。     

新型轮履复合式移动底盘的动力学仿真分析

提出了一种全地形,可实现轮-履快速转换的移动底盘设计方案,通过安装轮履复合变体式车轮(以下简称变体轮),可实现移动底盘在行驶过程中高机动性与高通过性相结合的目的,介绍了变体轮的工作机理,对移动底盘的驱动方案进行了选择,分析了机构越障过程中的动力输出特性,在此基础上利用多体系统动力学仿真软件RecurDyn建立了移动底盘车辆模型,并进行了越障能力仿真分析,为下一步的结构优化奠定了基础。     

具有越障功能的小型地面移动机器人

针对在危险环境下对移动机器人的运动要求,研究了机器人系统的总体设计,提出了一种具有越障功能的小型地面轮履复合式移动机器人,阐述了其机构设计度其实现。分析了谊机器人通过台阶、斜面、楼梯等障碍时的越障特性。研制完成的第一台样机具有结构简单、体积小、质量轻的特点,通过实验验证了该机器人运动灵活,具有很好的环境适应性和越障能力。     

小型轮履腿复合式机器人设计及运动特性分析

针对在室内外环境下对小型移动机器人的运动要求,综合轮式、履带式和腿式运动机构的优点,研制开发了一种多运动模式的小型轮履腿复合式移动机器人。该机器人可以进行轮式高速运动、履带或腿式越障等多种模式的运动。对其运动特性、越障性能、自动复位功能进行了详细的分析。采用的嵌入式控制系统保证了机器人功耗低、可靠性好、实时性高的控制要求。试验表明,这种移动机器人运动灵活,具有很好的环境适应性和较高的越障能力。     

轮-履复合被动自适应机器人设计与参数分析

针对地形狭窄、障碍物较高的非结构环境,提出了一种可正反向越障的轮-履复合被动自适应机器人。该机器人由车体模块、尾轮模块和两个左、右对称布置的轮-履复合模块组成。简述该机器人的整体结构和模式转换原理,并详细介绍了其动力传递过程和运动过程。通过建立机器人轮-履复合模块数学模型,分析各构件的运动关系,对轮-履模块的模式转换过程及受力情况进行研究,并研究了轮-履复合模块结构变形过程中履带长度的变化情况。分析结果验证了参数设计的合理性和方案的可行性。     

轮履复合式移动机器人设计及越障功能分析

进行了一种机器人行走系统的设计和越障功能分析。该系统采用轮履复合式移动机构,具有直线行走、左右转弯、通过凸台、攀越楼梯、跨越沟槽障碍等优点。从机构本体运动出发,分析了移动机器人各种路况下的通过性,得出其可行性条件。由分析可知,所提出的机器人行走系统适用于探测和救援等复杂环境。     

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.