基于P87LPC764的步进电机细分驱动电路硬件设计

本文提出了采用P87LPC764单片机实现步进电机多倍细分控制方法和电路实现的关键技术,完成了步进电机细分驱动电路的设计和硬件电路的制作.同时为保证驱动电路的正常工作设置了过电流保护,实现了一种软硬互补的驱动电路.     

多指灵巧手主从控制系统的硬件设计

设计了一种超声电机驱动的多指灵巧手控制系统的硬件电路。给出灵巧手控制系统的硬件总体设计方案,并对灵巧手控制系统的译码电路、关节信息采集电路、超声电机启停和正反转电路、超声电机的调速电路等外围电路模块的硬件设计过程作了详细的阐述,并加以实现。     

基于ATmega128的模糊控制系统

以ATmage128单片机为核心,提出了一种移动机器人路径规划模糊控制系统的设计思路,并给出了控制系统硬件和软件设计方案.系统预先设定目标,移动机器人根据超声波传感器感知环境信息,采用模糊控制进行路径规划,机器人自主移动到达目标.硬件方面介绍了显示电路、超声波测距电路、电机驱动电路、无线通信电路等接口电路.软件方面给出了模糊控制、超声波测距和无线通信的软件设计方案.使用MATLAB软件进行了仿真,仿真结果表明模糊控制系统具有较理想的有效性和可行性.     

电动车用空调电机驱动系统设计与实现

设计了电动车空调系统永磁同步电机驱动无传感器矢量控制系统.依据车用空调电机驱动系统的要求,基于DSP对电机驱动的硬件实现电路进行了具体设计,在此基础上进行了相应控制软件设计,实现了空调电机驱动的无传感器矢量控制.实验结果验证了该系统的可行性和有效性.     

架子鼓演奏机器人控制系统设计

设计的架子鼓自动演奏机器人,参照仿生学原理,利用Arduino单片机控制,将敲击节奏转化成机械语言。改变步进电机旋转角度,可完成有效的敲击,形成了一套完整的全自动演奏音乐机器人。为了驱动装置,设计的电路硬件包含主控电路、通信电路、电源管理电路以及电机驱动电路等,并设计了与之相对应的程序软件,最后对系统进行了验证。     

超声波电机谐振升压式驱动电源的研究与设计

从超声波电机的等效电路出发,研究了超声波电机谐振升压式驱动电源的工作原理,设计了电路并利用Multism进行了仿真实验及电机驱动实验,实验结果证明了该方案的可行性和有效性.     

一种适用于压电超声波电机的变频调速装置

压电超声波电机的工作原理及其驱动控制方式不同于传统电磁型电机，本文针对该电机的驱动要求，采用脉宽调制技术，研制了一套适合于该电机的PWM变频调速装置，对该装置各组成部分分别作了介绍。实验结果表明，所研制的PWM变频调速装置符合压电超声波电机的驱动要求。     

双步进寻迹跟踪示教装置的控制系统设计

设计出操作方便快捷的寻迹跟踪示教装置的控制系统,完成了硬件电路设计及软件程序设计。该控制系统主要由步进电机驱动模块和键盘输入模块构成。当人手按下按键时,就会向单片机发出脉冲信号,再由单片机控制步进电机驱动电路,实现步进电机对激光头X方向和Z方向上的位置控制,使激光头沿着黑带的轨迹完成跟踪扫描任务。该示教装置结构简单、可靠性高、成本低,具有很强的实用价值。     

一种硬币存储装置控制系统的设计与实现

设计了控制一个栅格式结构的硬币存储装置的控制系统,主控芯片采用高性能、低成本、低功耗及片上资源丰富的STM32F103ZE,硬件电路由单片机最小系统电路、RS232串口电路、电源转换电路、光电传感器检测电路、电磁铁驱动电路及步进电机驱动电路6部分组成,根据设计的控制流程编程运行,装置性能满足收币和找零的使用要求。     

基于ARM的汽车电动助力转向系统

在阐述了电动助力转向系统（EPS）及其控制器（ECU）结构和工作原理的基础上,设计了基于ARM S3C44B0X单片机电动助力转向系统。通过方向控制电路、H桥电机驱动电路和PWM脉宽调制技术实现对电机的控制。研制的硬件控制器通过了有关的电气性能测试,对所设计的硬件系统进行了台架试验,试验结果证明了硬件系统设计的正确性。     

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.