基于PMAC的精密定位控制系统的分析

主要介绍一种基于开放式多轴运动控制器(PMAC)和安川伺服电动机的一维精密定位控制系统,以PMAC运动控制器为控制系统核心,以安川全数字交流伺服系统为驱动。首先介绍∑-Π系列交流伺服电动机驱动器原理和PMAC控制器原理及其算法,并分别建立了伺服电动机和控制系统的数学模型,最后详细介绍本控制系统的软、硬件设计。     

MT5500型电动轮自卸车交流传动控制系统研制

针对MT5500型电动轮自卸车交流传动控制系统存在电制动力矩不足的问题,提出对其交流传动控制系统进行改进设计。文中介绍了该交流传动控制系统的总体结构及基本功能,研究了对其牵引逆变器、制动斩波回路进行改进设计的具体设计方法,最后通过样机实验对其效果进行了验证,结果表明:通过对该型车交流传动控制系统进行改进设计后,其制动效果得到明显提升,且工作性能稳定,取得了满意的控制效果。     

基于FPGA的交流伺服电机调速

目前交流伺服电机直接转矩控制技术是一种具有高静、动态性能的交流调速方法。以FPGA芯片为控制核心设计了感应电机直接转矩控制系统,用VHDL语言编写了系统的模糊控制软件。然后通过实验初步验证了基于模糊控制技术的感应电机直接转矩控制系统具有优良的动态和稳态性。     

基于Windows NT的交流伺服控制系统的设计与实现

在机电系统中,交流伺服控制得到了广泛的应用.随之而来的是,要求控制系统有高精度、高稳定性以及较好可扩展性.介绍了基于WindowsNT4.0环境的三轴交流伺服控制系统,阐述了系统设计原理、硬件组成、系统参数调试以及驱动程序的设计.     

机器人柔性抛光机床的力控制系统的建模与辨识

机器人柔性抛光系统中,力控制系统是重要的组成部分.力控制系统对抛光加工性能有重要的影响,直接关系着抛光质量.该力控制系统实际上是一个闭环的交流伺服系统,对力控制系统的建模为抛光系统的动态和静态性能分析提供了理论基础.     

新型10 kV验电笔启动电压装置交流耐压控制系统改造

传统交流耐压控制系统存在体积大、搬运难、误差高等问题,对于10 kV验电笔的启动电压测试工作造成了一定的影响。现提出一种新型的交流耐压控制系统,其将操作箱和试验变压器设计成一体,结合实际情况适当减少了试验变压器的容量,达到了缩小体积、提高精度的目的。实践证明,该交流耐压控制系统更有利于10 kV验电笔启动电压测试工作的开展。     

自动洗车机控制系统的设计

该设计是一个自动洗车机控制系统。系统主要由变频器、接触器、交流异步电机、红外传感器等组成。利用PLC作为控制核心,总结传统的自动洗车机控制系统的不足,进行了较为合理的设计,大大提高了自动洗车机控制系统的技术和水平。选择PLC作为整个控制系统的核心,在目前工业自动化控制当中已成为主流,大大提高了生产力和市场竞争力。     

齿轮测量中心交流伺服控制系统的设计与仿真

齿轮测量中心的数控系统要求高精度和运动平稳性。设计了齿轮测量中心的交流伺服控制系统,研究了驱动器的控制算法,应用Matlab/Simulink软件对控制系统进行仿真分析,节省人力的同时进一步提高系统的控制精度。现已应用于齿轮测量中心,实验结果表明该控制系统具有较高的测量精度和较好的重复性。     

焊接机器人控制系统的研究

介绍目前在汽车制造业普遍使用的激光焊接机器人的开放式控制系统。从硬件、软件、交流伺服控制系统以及之间的通讯关系等方面介绍了开放式控制系统的工作原理和实现方式。     

PLC与交流伺服在单轴控制系统中的应用

介绍了基于PLC的交流伺服电机控制系统,从系统参数分析设计入手,设计了基于三菱A系列PLC的电机伺服控制系统,给出了具体算法和软件程序.     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

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...