搬运机器人控制系统的设计及界面功能开发

针对搬运机器人的应用需求,设计了一种搬运机器人控制系统.介绍了搬运机器人控制系统的控制器硬件、示教器硬件和软件,控制器硬件包括工业主板、扩展板、电压转换模块、串口保护电路、通用串行总线接口保护电路、输入输出光耦隔离电路,示教器硬件包括液晶屏驱动板、触摸屏驱动板、信号转接板.对这一控制系统的界面功能进行了开发,并通过四轴平行机构搬运机器人进行了测试验证.     

多视点输送带纵向撕裂检测系统采集控制模块的研究

文中针对输送带纵向撕裂检测问题,提出一种基于FPGA的多视点输送带纵向撕裂检测系统采集控制模块的研究方案。采用FPGA XC3S500E芯片设计了采集控制模块硬件电路,包括CMOS图像传感器电路、信号调理电路、模数转换电路、信号采集控制电路和数据传输接口电路等。采用VHDL语言设计了FPGA软件,包括CMOS传感器驱动模块、模数转换驱动模块、乒乓存储模块等,并采用Modelism仿真工具对程序进行了时序仿真。经实验验证,该采集控制模块能够实现对多路线性CMOS信号的高速采集、实时存储和处理,满足系统对实时性和同步性的要求,可用于对多视点采集的同步性和实时性要求较高的工业检测系统。     

超声电机驱动和疲劳寿命集成测控系统

针对旋转型行波超声电机驱动和疲劳寿命测试要求,采用嵌入式微控制器可编程片上系统(PSOC)设计了单片集成测控系统.利用该微控制器的数字模拟混合设计特性,设计了超声电机驱动信号产生模块;基于内部运放设计了数控电流源,针对磁粉制动器实现了数控加载控制;采用内部比较器设计了转速信号调理电路,实现了信号整形处理,便于外部接口.该集成测控系统简化了电路设计,提高了系统的稳定性,便于组成测控网络或移植到其他类似应用.     

基于单片机和CPLD的无刷直流电机系统

基于高速单片机和复杂可编程逻辑器件(CPLD)设计了一种具有霍尔位置传感器接口电路、电流采样电路以及编码器接口电路的无刷直流电机伺服控制器.该控制器可以实现无刷直流电机的有位置传感器控制和无位置传感器控制.以霍尔位置传感器的位置信号作为电机的换向信号并对该信号进行六倍频处理作为速度反馈,从而实现对电机的转速控制,给出了该控制系统的硬件结构设计和软件流程设计.试验结果表明:该无刷直流电机控制系统能够较好地实现电机的转速控制,为电机控制系统的设计提供了新思路.     

VXI总线电机控制驱动模块设计

本文介绍了VXI总线C尺寸电机控制驱动模块设计方法.该模块能够同时控制四路直流电机的运动,本文对模块的关键设计进行讨论,包括VXI总线接口电路选择,控制驱动电路设计和反馈电路设计,重分析了主控CPU的选择以及控制算法的实现等关键问题.     

学生公寓BAS系统与DDC控制器设计

在分析学生公寓功能与特点的基础上,提出了学生公寓BAS系统总体结构并说明了各种DDC控制器功能。以宿舍综合控制器为例,设计了以80C196KC单片机为核心的控制器的组成。包括单片机最小系统、检测信号接口电路、控制信号接口电路以及与楼机的485通信接口电路的设计。     

一种基于TMS320F2812的电动汽车电驱动系统

详细介绍了一种基于DSP TMS320F2812的电动汽车电驱动系统的设计方案.该方案中的硬件主要包括逆变器及其驱动电路,传感器、保护信号及接口电路,信号处理电路3大模块,并结合驱动电路,提出了一种简单易行的限流保护技术.在软件方面,主要强调了电流采样问题,研究了不同PWM控制对转矩的变化.实验表明,采用该方案,电动汽车运行安全可靠,而且可以有效地降低成本.     

基于DSP的仿蚯蚓移动机器人控制系统硬件设计

在对仿蚯蚓移动机器人运动规划及其驱动器的工作原理研究的基础上,设计了基于DSP的机器人运动控制系统硬件电路.采用模块化的设计思路,以DSP为核心模块,外围电路扩展了D/A、A/D、RAM电路,主要的控制信号由可编程逻辑器件CPLD实现,DSP与上位机及外围扩展电路之间的通讯通过DSP的SCI以及McBSP和SPI等接口实现.基于DSP的数字控制方式,不需要采用复杂的模拟电路,对噪声信号有较强的抗干扰能力,提高了系统的可靠性.     

基于CPLD与LabVIEW的电控系统故障检测仪开发

开发了多功能、便携式和高性能的布雷控制系统故障检测系统.检测系统由上位机和下位机两部分组成.上位机由工控机、触摸屏、液晶屏和接口电路等组成,主要完成故障诊断处理过程、故障原因和故障排除方法等的显示任务.下位机负责电控系统故障信号的调理、采集和信号连接等功能.主要由大容量信号接口电路、信号调理电路、信号采集电路和串口信号转换与通信电路等组成,其核心是双CPLD数据采集板.检测仪的软件也分为两部分,上位机软件由LabVIEW虚拟仪器软件平台开发,完成故障诊断信号的显示与人机交互等任务.下位机软件由VHDL开发,主要是驱动CPLD电路、数据采集和串口转换与传输等的运行.     

基于CAN总线的汽车电子换挡控制模块的设计

针对自动挡车型的换挡方式,对于机械式与电子式换挡方法的优缺点进行了对比分析。提出了电子换挡控制的系统设计方案,同时研究了通过霍尔传感器识别挡位信号的方法,并设计了相应的接口电路。基于系统设计方案,针对MCU、DCDC稳压电路、CAN总线收发器、LED驱动、电磁铁驱动等硬件电路进行设计,并提出了控制模块的软件设计方案。     

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.