基于物联网的风力发电机状态监测系统设计

为了确保风力发电机组持续、稳定运行,设计了一种基于物联网的风力发电机组状态实时监测系统。系统以嵌入式ARM-Linux为控制核心,采用多个传感器组实时监测发电机的转速、转矩以及工作温度等参数,通过4G网络传输方式将所采集到的数据打包后统一发送到数据服务器中心,最终在PC机端实时查看监测到的数据。实际试验结果表明,系统能有效监测到发电机组的转速、工作温度以及电网参数等数据,为风力发电机的故障预测以及故障诊断提供坚实的数据基础。     

基于单片机的直流电机远程测控系统

本文以1．5KW直流电机为被控对象。介绍了采用单片机和PC机构成的电机远程测控系统。采用转速的周期测量法和电机的PWM控制方式实现对电机转速的高精度测量与控制。设计了单片机系统和PC机间的通信接口。上位机采用VC设计监控程序对电机进行实时监控。系统运行稳定可靠。     

电动装置测试系统的研究及实现

基于ARM单片机和CPLD，研制开发了电动执行装置测试系统，该系统可以精确测量电动执行装置的转速、堵转转矩、最大和最小控制转矩等重要参量，并通过485总线实现与上住机的通讯，下位机实现了测试数据的打印、显示。同时，给出了力矩标定的算法及转速、力矩的测试流程。     

基于电量变送器的挤压机监测系统的设计

以单片机作为控制核心,应用交流高速采样电量变送器,完成对变频改造后挤压机的电压、电流、有功功率、转速、转矩等多个参数的测量。测量数据均采用数字化软件校正,并可上传PC机。系统测量数据准确、性能稳定。     

嵌入式水力测功器测控系统

设计了一套基于嵌入式和虚拟仪器技术的水力测功器测控系统。由LPC2210芯片构成的现场控制单元主要完成对转速、转矩等信号的采集,以及对转速的跟随控制,上位机采用虚拟仪器对现场控制单元的信号进行处理和显示。     

磁力泵计算机辅助测试系统的设计与研究

该文利用液压试验原理、计算机测试技术等原理，设计磁力泵CAT系统。通过对磁力泵流量、进出口压力、电机转矩和转速等参数的测量，来实现磁力泵性能特性的测试，并开发具有实时数据采集处理、屏幕显示和打印功能的Windows环境下的磁力泵参数计算机自动测试系统。     

基于80C196单片机的实时数据采集显示系统

高效的指令系统和片内集成的AD、D／A转换器，使80C196在自动控制领域中获得了广泛的应用。在基于微机的电机教学实验系统中，我们使用80C196作为下位机实现对电机转速、转矩、温度、电流、电压物理量检测，并使用键盘显示芯片ZLG7289A完成参数设置及采样数据的显示，同时将数据存贮并送到上位机进行进一步处理。现介绍该系统的下位机结构并讨论应用中应注意的一些问题。     

通过LabVIEW对轴承测试台进行实时监控

任务:为轴承测试台开发一个基于PC机的实时监控系统.解决方法:采用由LabVIEW程序控制的SCXI和DAQ板.位于明尼苏达州泰勒市的Waston Engineering(一个汽车应用试验小组)开发了一种基于PC机的轴承测试台实时监控系统.系统使用LabVIWE控制的SCXI信号调节组件和DAQ板.测试台的目的是对一个旋转飞轮加载24个汽车轴承,同时监测轴承温度和声音的传播.通过编程,增加飞轮转速的模式.     

水轮发电机组振动监测软件系统的开发

开发了基于PC机的中小型水轮发电机组振动监测系统软件,讨论了系统的实时数据采集、数据标定处理、数据滤波压缩、实时数据库、实时动态曲线显示、历史数据管理、系统管理、报警数据库及其管理、多线程技术、帮助系统。通过实例应用表明:设计和开发的基于PC机的中小型水轮发电机组振动监测系统可靠、实用。     

基于LabVIEW的电机转速转矩测量系统设计

传统的电机性能参数测量系统一般以单片机为核心,包含用户接口、输出显示等功能,但这些产品都是以硬件为核心,使得与用户的交互和功能的修改都很不方便。现基于Lab VIEW软件平台,设计一个电机转矩转速测量系统,利用JN338转矩转速传感器检测电机驱动控制系统的转矩、转速信号,然后利用DAQ数据采集卡采集从JN338转矩转速传感器出来的转矩、转速信号,并利用Lab VIEW软件对测量的信号进行计算处理,得出实际转矩、转速大小及波形;另外,测量系统界面设计十分人性化。     

汽车主减速器总成在线检测系统研究

主要介绍了以阶次分析为核心的主减速器总成在线检测系统的组成及技术实现。系统作为主减速器柔性装配线的最后一道工序,以阶次分析为核心,实现对转速、转矩及振动信号等实时数据的采集、处理、显示和存储。该系统可以实现对多种减速器总成的综合性能的检测,并可以通过预先设定的评判策略对产品性能做出评测。     

变速箱在线试验台技术研究应用

文中主要介绍了变速箱在线试验台的组成及技术实现。该在线试验系统作为变速箱装配线的最后一道工序,通过模拟变速箱运行状况对变速箱进行加载,并以阶次分析为核心,实现对转速、转矩及振动信号等实时数据的采集、处理、显示和存储,并进行故障诊断。该系统可以实现对变速箱综合性能的检测,保障变速箱质量。     

基于伺服电机与PLC自动控制的深孔钻设计

深孔的长径比（L／D）越大,钻削时加工难度也越大。为了提高深孔加工精度和工作效率,需要从刀具、工艺和控制等多方面加以改进。文章提出了一种基于伺服电机检测钻头扭矩、用PLC对加工过程进行自动控制、用人机屏实现人机交互的深孔钻加工系统。调试结果表明：采用该系统既能提高钻削效率和加工精度又能延长钻头的寿命。     

基于轴角检测的力矩电机转矩控制系统

设计并实现了基于轴角检测的力矩电机转矩控制系统.重点讨论了由旋转变压器和旋转变压器/数字转换器构成的电机轴角检测电路的设计;详细分析了二者之间以及轴角检测电路与主控芯片之间的数据传输方式;创新设计了基于OPA548的电机驱动电路,并利用PWM调制,编程实现了电机转矩的控制.实验结果表明,系统设计合理,电机轴角检测电路准确可行,电机转矩控制精确.     

The effect of cryogenic treatment on tapping

This study was realized with two different types (flat and thread rolled) of coated (TiAlN), uncoated, and cryogenically treated taps (uncoated). The tapping processes were carried at four different cutting speeds (2, 3, 4, and 5 m/min) and 1.25 mm/rev feed rate under dry and wet cutting conditions on the Ti-6Al-4 V alloy. The measured cutting forces (cutting torque) were evaluated according to the cutting tool and cutting parameters. The best results in terms of cutting torque were obtained with straight flutes with spiral point taps. For the coated cutting tools, it was seen that the cutting torque was higher with respect to the other tools. The cutting fluid caused decreases in cutting forces for both of the cutters. Under dry cutting conditions, in the cryogenically treated tool, cutting torques came out to be lower with respect to the coated and uncoated tool.     

基本磁性参数综合测试系统

将振动样品磁强计，磁转矩测试仪，磁电阻效应测试仪的资源重新配置，借助轨道运载可移动的电磁铁将3台仪器平台有机地组合在一起，并设计一个系统能够将各自的应用软件集成在一个软件环境下，实现资源的共享、数据的交流、数据的综合分析与运用，提高设备的利用率。结果表明：在硬件上节省了2台电磁铁、2套计算机和接口电路等；在软件上，统一了数据在一个界面下的处理和存储格式。这是一种典型的以时间换取资源的合理配置。     

Adaptive MRAC-based direct torque control with SVM for sensorless induction motor using adaptive observer

This paper presents an improved direct torque control (DTC) method for induction motor (IM) drive. The main drawback of the conventional DTC is the use of hysteresis comparators which leads to high torque and flux ripples. The improvement in this paper includes using the space vector modulation to preserve a constant switching frequency and to reduce totally flux and torque ripples. Besides, the torque and stator flux regulation will be done based on model reference adaptive control (MRAC) strategy to ensure a robust control against external disturbance and less sensitivity from machine parameter variation unlike the conventional proportional-integral (PI) controllers. Furthermore, a design of an adaptive observer based on Lyapunov stability is presented for speed/flux and load torque estimation. The observer can improve the control performances and decrease the cost and increase reliability of the global control system by reducing the number of sensors. The proposed strategy will be examined under simulation tests using Matlab/Simulink and experimental implementation with real-time interface (RTI) based on dSpace 1104 board.     

SYSTEM FOR TORQUE CONVERTER DESIGN AND ANALYSIS BASED ON CAD/CFD INTEGRATED PLATFORM

A 3D torque converter design system is developed based on numerical investigation into flow field and CAD technology. The 3D steady-state flow field simulation is undertaken by using time averaged Reynolds equation and k-epsilon turbulence model, with mixing-plane boundary conditions at three section interfaces. The blades are designed according to the flow field characteristics by using a reverse design method in the system. The accurateness of numerical analysis and the validity of design system are verified by the fluid field experiment of desingn example of the torque converter. This kind of design and analysis system for torque converter based on integration of comput ationol fluid dynamics （CFD） and CAD is a powerful tool for torque converter manufacturing, but also a prettg important significance for research and development.     

驱动桥制动参数检测系统设计

制动性能检测是商用车驱动桥下线前质量检测的重要环节,其检测结果将直接影响整车的行驶安全性.介绍了一种以工控机为核心,以可编程控制器(PLC)为控制装置,基于串口通信及软件技术的驱动桥制动参数检测系统,可通过在试验台上的制动试验,对被测驱动桥的制动时间、制动力矩、制动力、制动距离等参数进行采集和分析对比,进而确定产品是否...     

Performance of a newly developed torque-sensor motor

A new type of induction motor with a built-in torque sensor (called a ‘torque-sensor motor’) has been developed in order to monitor grinding torque. Its rotor shaft consists of a hollow shaft and torsion bar, each of which has a disc with equiangularly located magnets. The torque output is calculated by microcomputer from the time delay of pulses generated in detecting coils. This toque sensor has good linearity. Torque ripple and zero-point drift caused by rotational speed change are estimated to be less than 1 Nm. It is so sensitive that it can detect torque ripple from rotational error of the driving belts on the grinding machine. Further, it can accurately monitoring grinding torque by using a low pass filter to remove such torque ripple. It can also be used to estimated the time constant of the grinding wheel and workpiece system in the transient torque situation of a grinding cycle. The performance of the grinding wheel motor is as good as that of a conventional motor.