虚拟环境下机器人远程控制

结合虚拟环境技术与远程机器人控制技术，设计开发了一个基于虚拟环境的机器人远程控制系统，实现了通过识别语音控制命令，控制虚拟机器人动作，带动远程机器人完成语音内容相应的动作，并进行机器人动作的固体反馈。通过对真实机器人控制的系统运行，表明该控制系统的有效性。     

基于改进的DTW算法的变电站巡检机器人语音识别的实现

提出了一种对变电站巡检机器人进行语音控制的语音识别算法,实现了语音控制机器人。通过机器人携带的拾音器录制采集语音控制命令,根据语音识别的基本原理,对变电站巡检机器人进行语音控制,使其根据人的指令做出相应的动作,完成自动检测和信息查询功能。首先,使用机器人采集语音指令,并将其传送到系统后台构建样本库。其次,对样本库进行分析,提取语音样本的MFCC特征。最后,使用改进的DTW算法作为匹配算法实现语音参数模板匹配,进行语音识别,将识别结果传送给机器人系统控制机器人运动。实验结果表明,该算法能够提取有效的语音指令,识别语音指令时间短,识别正确率高,满足了对巡检机器人的实时控制要求。     

语音识别技术在机器人控制中的应用

研究语音识别技术在机器人控制系统中的应用及实现.分析以线性预测倒谱系数为特征矢量的模板匹配法语音识别原理,并利用VC++6.0和微软语音开发包Speech SDK设计出语音识别接口,提高了语音程序的开发效率,实现了对ASR型移动机器人的语音控制.     

移动机器人路径控制网络中异常参数识别方法

移动机器人控制网络中的异常参数特征无法形成可识别的非平稳输出信号,导致传统的基于局部均值分解的异常参数识别过程精度低。提出一种移动机器人路径控制网络的异常参数识别方法。以移动机器人路径控制网络中,电路异常量处理结果作为支持,根据机器人射频识别量计算原理,通过单片机异常参数整合的方式,计算移动机器人路径控制网络中的可疑异常参数特征。在此基础上,通过单分量控制信号模态分解、多分量控制信号模态分解的方式,计算模态频率的阻尼比数值,完成移动机器人路径控制网络中异常参数识别。比对实验结果表明,与局部均值分解手段相比,异常参数识别精准度提升,非平稳信号调幅周期缩短至0.90s,调频波总长度不超过11.4mm,机器人非平稳输出信号的振动响应属性得到有效控制。     

基于径向基神经网络图像识别的移动机器人控制系统仿真

为实现人机交互的移动机器人轨迹控制,研究了基于径向基神经网络图像识别的移动机器人控制系统,设计了基于神经网络的图像采集和识别处理模块,处理了移动机器人路径控制的关键问题。通过建立手写字体数字(基于神经网络)的图像采集和识别处理模块,搭建移动机器人轨迹控制数学模型,最终在该模型基础上设计了该类机器人基于图像识别结果的路径控制算法。利用仿真软件MATLAB的robot tool工具箱,进行了移动机器人控制轨迹控制的仿真。仿真结果证明,路径控制方案可以很好的让移动机器人完成预定的路径跟踪。从而从理论上解决了基于视觉的移动机器人轨迹控制问题的难题,并为实现基于视觉的移动机器人轨迹控制提供了理论依据。     

稀疏自编码深度神经网络及其在滚动轴承故障诊断中的应用

针对目前滚动轴承故障诊断主要采用监督式学习提取故障特征的现状,提出了一种基于稀疏自编码的深度神经网络,实现非监督学习自动提取滚动轴承振动信号的内在特征用于滚动轴承故障诊断。首先,将轴承故障振动信号的频谱训练稀疏自编码获得参数;然后用稀疏自编码获得的参数和轴承振动信号频谱的频谱训练深度神经网络,并结合反向传播算法对深度神经网络进行整体微调提高分类准确度;最后用训练好的深度神经网络来识别滚动轴承故障。对正常轴承、外圈点蚀故障、内圈点蚀故障和滚动体裂纹故障振动信号的分析结果表明:相比反向传播神经网络,提出的深度神经网络更能准确的识别滚动轴承故障类型。     

基于HMM的下肢表面肌电信号模式识别的研究

采用隐马尔科夫(HMM)的信号分类识别方法,用以实现下肢步态中各细分动作的更好识别和描述。首先将待分类的肌电信号进行预处理,按等时间间隔对每通道的肌电信号划分不同的段,采用小波变换方法对每个数据段内肌电信号进行多尺度分解,并提取小波分解系数的奇异值构成观察值序列。将步态周期的四种运动模式与HMM状态一一对应,用Baum-Welch算法对HMM参数进行重估训练,再用标定技术处理的前向后向算法和Viterbi算法进行识别,得到的平均识别率高于90%。然后在四种运动模式中分别提取小波特征组成特征编码,送入概率神经网络(PNN)中进行识别。证明HMM的识别效果优于概率神经网络,能够更好地应用于假肢的控制研究。     

基于工业控制计算机的移动机器人控制系统设计

为复杂运动控制算法建立实验平台,以工业控制计算机为核心,设计了一种基于工业控制计算机的移动机器人控制系统,介绍了该控制系统的机械结构、硬件组成和软件系统的构成,对控制系统硬件部分进行了详细分析和设计,详细介绍了控制系统的动力系统、感知系统和中央控制系统的构成及布局。针对所构建的机器人系统,能够实现基于人工势场的机器人路径轨迹规划等算法验证,能够用于多传感器信息融合算法测试、路径轨迹规划策略测试、图像检测识别相关算法测试等。     

基于手势识别的两轮机器人控制系统设计

提出了一种基于人类手势识别的机器人移动控制系统设计.采用IBM笔记本电脑作为上层控制器,DCT0020运动控制卡作为下层运动控制器,较好地实现了人手手势信息识别以及对机器人的实时控制.介绍了机器人的机械系统结构,论述了基于BP神经网络算法进行手势信息识别和VC6.0的控制平台编程以及基于无线通信的遥操作技术.通过实际环境下对手势信息的采集、预处理、识别,最终实现对机器人的运动控制,验证了识别算法的可行性以及控制系统的稳定性.     

机场服务机器人控制系统设计与研究

针对现有机场空间大、人员复杂、服务项目繁多等机场服务问题,设计了一种用于机场服务、协助机场管理的服务机器人控制系统。该机器人控制系统设计通过基于轮式移动的平台结构方案以及基于ARM系列STM32单片机的底层控制和人机交互系统界面(包括语音交互程序和界面交互程序)的设计与程序编写,实现联网查询信息、语音识别预设应答、机器人避障移动等功能。论文分别从硬件和软件角度研究了机场服务机器人的控制系统和系统功能实现方法,介绍了机器人运动控制系统和语音控制系统的原理,分析了机器人避障移动算法基本步骤流程,完成了试验样机构建并进行了机器人控制系统性能测试。     

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.