一种风电设备发电机底座组对焊接工装的设计与应用

本文介绍了一种风电设备发电机底座组对焊接工装的设计与应用情况。首先介绍了设计原理;其次介绍了基本结构,具体的制作方法;最后介绍了具体实施方法及应用前景等。     

基于比例阀和伺服阀的恒减速液压站的研究

本文分介绍了液压制动系统在煤矿上的应用情况,对二级制动时减速度进行了简单的分析,并介绍了二级制动和恒减速制动的工作原理和它们的区别。简要介绍了电液比例阀和伺服阀各自的原理和区别。针对E141A液压站介绍了恒减速液压站的基本组成和主要作用,然后简要介绍了该液压站在工作制动时的电气控制原理和液压原理。最后主要介绍了安全制动的工作过程,并介绍了他的电气和液压系统的控制原理。     

在线厚度检测技术

介绍冶金行业生产过程中在线厚度检测技术的现状。重点介绍了各种测厚仪原理,并简要介绍了目前应用的情况。为应用厂家的设备选型提供参考。     

直线电机在精密加工中的应用

介绍了直线电机的特点及工作特性，并针对永磁动圈式直线电机介绍了其性能测试与控制方法。最后介绍了直线电机的精密磨削加工中的应用实例。     

风电设备坡口加工装置设计与应用

本文介绍了风电设备中的增速机架圆筒坡口加工装置设计与应用情况。首先介绍了设计原理，计算公式；其次介绍了基本结构，包括轨道部分、定位夹‘紧部分和切割小车三部分及具体的制作方法和关键机构参数；最后介绍了具体应用方法及应用前景等。     

高速磨削的应用及发展

文中介绍高速磨削的工艺基础及发展现状。首先介绍了高速磨削时的切屑形成。然后考虑了磨削时的功率分配。重点介绍机床及砂轮的改进,以及高速磨削的现状及应用。     

激光打标机的发展趋势及其控制系统设计

首先介绍了激光打标机的产生背景、发展趋势以及应用状况,然后介绍了激光打标机的结构,最后重点介绍了嵌入式激光打标机控制器的总体设计及其部件组成。     

大批量生产望远物镜的自动测量

本文主要介绍一种利用ＣＣＤ器件作探测器，具有自动定焦功能的望远镜物镜自动测量装置。介绍了测量原理，光电自动定焦问题，减小和消除误差的方法。提出了一种确定刻线像中央峰值位置的方法。文中还介绍了这些技术的程序框图。最后介绍了该仪器的其他功能     

电力系统无功补偿技术的应用

着重介绍了电力系统中各种无功补偿技术的实际应用情况。首先对传统的静止无功补偿装置作出介绍,分析了其工作原理及优缺点;其次对静止无功发生器进行简单介绍,分析其主要特点及存在的不足;然后介绍了用于谐波动态抑制,进行无功补偿的电力有源滤波器;最后提出在电力电子技术发展的基础上所设想出的多功能装置——综合潮流控制器。以期通过电力系统无功补偿技术应用的介绍,为提高电力系统运行效益提供参考。     

盘形凸轮轮廓曲线检测中的数据处理

介绍了在数控凸轮磨床工作台上对平面凸轮轮廓线进行检测的方法,这里主要介绍盘形凸轮轮廓曲线检测中数据处理的方法,并详细介绍了曲线拟合方法。     

Studies in dynamic design of drilling machine using updated finite element models

The aim of the present work is to develop updated FE models of a drilling machine using analytical and experimental results. These updated FE models have been used to predict the effect of structural dynamic modifications on vibration characteristics of the drilling machine. Two studies have been carried out on the machine. In the first study, modal tests have been carried out on a drilling machine using instrumented impact hammer. Modal identification has been done using global method of modal identification. For analytical FE modeling of the machine, a computer program has been developed. The results obtained using FEM, have been correlated with the experimental ones using mode shape comparison and MAC values. Analytical FE model has been updated, with the help of a program, which has been developed using direct methods of model updating. In the second study, modal testing has been carried out using random noise generator and modal exciter. Global method has been used for modal identification. Analytical FE modeling has been done using I-DEAS software. Correlation of FE results with the experimental ones has been carried out using FEMtools software. Updating of the analytical FE model has also been done using the above software, based on an indirect technique viz. sensitivity based parameter estimation technique. The updated FE models, obtained from both the studies have been used for structural dynamic modifications (SDM), for the purpose of dynamic design and the results of SDM predictions are seen to be reasonably satisfactory.     

成教机房的管理特点

根据成人教育的特点，介绍了成教机房在系统安装上采用双操作系统，在机房系统维护方面采用硬盘保护卡及实时管理软件的双保护的机房管理方法。     

接触迹对齿轮副啮合性能的影响

分析了接触迹对齿轮副啮合性能的影响及其之间的关系.对生产中广泛应用的格里森计算程序进行了改进,通过比例修正实现了齿面接触性能的预控,最后对内对角接触与常规设计的齿轮副啮合性能进行了对比试验.实验证明,接触迹采用内对角设计能够有效地改进齿轮副的动态啮合性能.     

Optimization of machining parameters on temperature rise in end milling of Al 6063 using response surface methodology and genetic algorithm

This present study focused on the effect of machining parameters such as helix angle of cutter, spindle speed, feed rate, axial and radial depth of cut on temperature rise in end milling. A prediction model of the temperature rise was developed using response surface methodology. The experiments were conducted on Al 6063 by high-speed steel end mill cutter based on central composite rotatable designs consisting of 32 experiments. The temperature rise was measured using K-type thermocouple. The adequacy of the model was verified using analysis of variance. The given model is utilized to analyze direct and interaction effect of the machining parameters with temperature rise. The optimization of machining process parameters to obtain minimum temperature rise was done using genetic algorithms. A source code using C language was developed to do the optimization. The obtained optimal machining parameters gave a value of 0.173 °C for minimum temperature rise.     

基于FPGA的FIR滤波器设计与实现

文章研究基于FPGA、采用分布式算法实现FIR滤波器的原理和方法,用DSP Builder设计了一个4阶FIR滤波器,并用QuartusⅡ进行硬件仿真,仿真结果表明设计FIR滤波器的正确性。同时使用IP Core开发基于FPGA的FIR数字滤波器,利用现有的IP Core在FPGA器件上实现滤波器设计。     

数控加工链轮齿形的应用研究

使用圆柱立铣刀数控铣削加工链轮,采用直角坐标系（直线轴）附加旋转轴的控制方式：应用直线轴控制多段曲线的连接。完成链轮各单齿齿形的数控加工,使用数控回转工作台完成链轮零件的分齿运动,利用子程序来循环重复上述运动。此加工方式相比二维坐标轴数控加工链轮的控制具有更为理想的加工效果。并且在保证零件设计基准、装夹定位基准和装配基准重合的基础上,应用子程序有效地保证了链轮各齿形尺寸精度的一致性;使用旋转坐标控制,有效地保证和降低了链轮轮齿的分齿误差。在数控铣床上使用普通圆盘工作台,利用暂停指令手动进行链轮齿形分齿运动的做法．更加完善和拓宽了数控技术具体应用的实用性。     

In-cycle monitoring of tool nose wear and surface roughness of turned parts using machine vision

Tool wear has been extensively studied in the past due to its effect on the surface quality of the finished product. Vision-based systems using a CCD camera are increasingly being used for measurement of tool wear due to their numerous advantages compared to indirect methods. Most research into tool wear monitoring using vision systems focusses on off-line measurement of wear. The effect of wear on surface roughness of the workpiece is also studied by measuring the roughness off-line using mechanical stylus methods. In this work, a vision system using a CCD camera and backlight was developed to measure the surface roughness of the turned part without removing it from the machine in-between cutting processes, i.e. in-cycle. An algorithm developed in previous work was used to automatically correct tool misalignment using the images and measure the nose wear area. The surface roughness of turned parts measured using the machine vision system was verified using the mechanical stylus method. The nose wear was measured for different feed rates and its effect on the surface roughness of the turned part was studied. The results showed that surface roughness initially decreased as the machining time of the tool increased due to increasing nose wear and then increased when notch wear occurred.     

边界条件对圆管层流流动的影响分析

应用Fluent软件,分别在匀速度和抛物线形速度分布入口条件下模拟圆管层流流场得到进出口静压降,并与理论值进行比较.结果显示了匀速度入口下进出口静压降与理论值误差百分比随雷诺数增加而急剧增大;而抛物线形速度人口下进出口压降与理论值基本吻合.     

基于PLC实现的光电式纠偏系统

本文针对彩色印刷、印染等行业中存在的位置偏差问题,设计出了基于模糊控制思想的光电式纠偏系统。该系统用PLC作为核心控制器、GK112光电隔离器检测位置偏移量、三相步进电机驱动丝杠作为执行机构。通过实验证明了该系统有较高的实用性。     

基于AutoCAD的对象数据库使用方法的研究

从AutoCAD对象数据库入手,研究了基于AutoCAD2000平台,用VLISP语言编程访问对象数据库的方法。提出了得到要访问的对象的图元名,然后得到该图元的相关对象数据表及扩展数据,再在程序中使用这些数据的方法。