大型多支承回转窑运行轴线快速检测方法及其便携式系统

介绍大型多支承回转窑运行轴线快速检测方法及便携式检测系统,该方法在回转窑筒体下面2个径向应变为零的方向安装非接触式位移传感器,对安装在简体上的键相进行测量．由测得的位移值计算出该位置截面的回转中心。便携式检测系统由传感器安装支承装置,集成式信号采集装置和便携式计算机装置等组成,并编制相应的数据采集及处理软件。     

基于轴线检测定量分析大型多支承回转窑支承力

回转窑是冶金、水泥、耐火材料生产中的关键设备，是一种重载、大扭矩、多支点、静不定运行系统。生产中为对它进行合理维护与检修，需要准确掌握它运行时支承载荷的分配。针对回转窑载荷分布和刚度变化的特点，建立静不定梁求解的通用模型和矩阵，分别求得回转窑垂直和水平方向上的支承合力，导出插轮支承力计算的线性公式，通过检测轴线偏差可方便，准确地分析托轮支承力，并给出分析和应用实例。     

大型多支承回转窑简体系统的动力响应分析

回转窑运行中简体、滚圈、托轮及轴承系统耦合成复杂的多支承动力学系统，运行轴线动态变化和冲击突变载荷将给设备带来复杂振动，从而加速疲劳破坏，增加设备故障率。文中采用传递矩阵法，首先建立回转窑筒体系统的动力学模型，再推导各类激励作用下筒体系统振动的传递矩阵修正响应列阵，最后建立系统的动力响应方程，从而找到计算动载荷和轴线检测动态误差的基本方程。     

多支承回转窑运行轴线零应变方向键相测量法

介绍了一种回转窑运行轴线测量的新方法,该方法在回转窑简体下面两个径向应变为零的方向安装了非接触式位移传感器,对安装在简体上的键相键进行测量,由测得的位移值计算出相应截面的回转中心。该方法克服了现有测量系统高处安装系统定位困难、测量操作复杂和测量误差大的缺点,解决了回转窑运行轴线不可监测的难题,在实际应用中效果很好。     

大型多支承回转窑筒体系统的动力响应分析

回转窑运行中筒体、滚圈、托轮及轴承系统耦合成复杂的多支承动力学系统,运行轴线动态变化和冲击突变载荷将给设备带来复杂振动,从而加速疲劳破坏,增加设备故障率.文中采用传递矩阵法,首先建立回转窑筒体系统的动力学模型,再推导各类激励作用下筒体系统振动的传递矩阵修正响应列阵,最后建立系统的动力响应方程,从而找到计算动载荷和轴线检测动态误差的基本方程.     

回转窑轴线测量系统

回转窑轴线的测量对于合理调速工艺操作规程及托轮摆放位置、避免托轮轴瓦发烧、改善筒体的受力状况、保护筒体等，具有重要的实际意义。设计开发一个新型的大型回转窑轴线测量系统，该系统具有结构简单、安装测量方便、精度高、可记忆存贮和通讯等特点。     

大型回转窑力学性能分析及轴线检测系统研究

本文对回转窑的力学性能进行分析,并介绍一种基于摄像头采集数据的轴线检测系统。利用连续梁理论和筒体理论,结合位移函数和边界条件理论分析了筒体和支承系统的受力,并进行有限元分析各部分受力,得到了各部分应力分布。同时介绍了摄像头采集轴线水平和垂直偏差的原理,通过数据处理与传输模块发送到上位机动态显示,整套系统在实验室模拟效果较好。本系统安装便捷、成本低,可在大型检测中得到推广。     

回转窑轴线检测技术的研究现状和发展趋势

阐述了回转窑轴线监测的国内外研究现状,通过分析得出回转窑轴线检测技术将向高精度、直接测量、网络化和智能化的方向发展。     

大型回转体运行轴线测量45°方向键相法及其便携式系统

介绍一种大型回转体运行轴线的测量方法及其便携式测量系统。该方法在回转体两边 4 5°方向上安装非接触式位移传感器 ,采用键相法原理高精度地确定两个位移信号的时差及回转体的运转周期 ,从而计算出该位置的回转中心。编制相应的数据采集及处理软件 ,由计算机、传感器、A / D采集卡、安装支架等组成便携式测量系统。该系统结构简单、使用方便、测量精度高     

科学调整回转窑轴线的方法

通过相关数据的测量和分析,找出影响回转窑轴线直线度的因素,科学制定调整方案,保证了回转窑的稳定运行。     

回转窑新型支承结构的力学性能分析及设计

这里针对回转窑筒体在运转时发生持续下滑,,引起系统频发故障,造成停机的问题,分析论证了窑体下滑力产生的根本原因及消除方法;在理论分析的基础上,设计了消除下滑力的新型支承结构,给出了结构参数的计算方法以及不同斜度回转窑的设计参数值;探讨了新型结构设计应用中的关键问题。     

LI-6400光合测定系统使用中故障分析与排除方法

本文从光合作用、传导和细胞间CO_2浓度三个方面分析了系统显示异常结果的原因,提出了解决方法。     

Design and implementation of a portable electronic system for vehicle-driver-route activity measurement

This paper presents the autonomous, non-intrusive and universal electronic equipment PGAMS: Portable Global Activity Measurement System, which is able to simultaneously measure and synchronously register the treble driver-vehicle-route activity. It allows one to evaluate the direct effect that real road traffic conditions have on environmental pollution. Among the variables to be simultaneously measured are: (a) from vehicle activity: regime engine and temperature, fuel consumption, global position, instantaneous and average speed and acceleration, frontal and lateral inclination; (b) related to route features: weather conditions, slope and camber of the road, traffic density; and (c) derived from driver activity: clutch, throttle and brake pedal actions. The designed prototype can be on boarded in conventional or industrial vehicles, working in both urban and inter-urban conditions. The paper describes the integration with pollutant emissions meters. Besides, it includes experimental results carried out in real traffic conditions relating vehicle-driver-route activity with gasses emissions.     

新型光电式转矩转速测量系统的研究

基于8051单片机,利用光反射原理和光电元件的响应特性,提出了一种在高速运转条件下测量转速转矩的新型光电式测量系统.阐述了其测量原理和主要硬件电路设计,具有结构简单、测量准确、使用方便等特点.     

Linux文件系统健状性测试与分析

健壮性是衡量软件性能的一个重要的指标,Linux是一个世界各国使用的自由和开放源码的操作系统,它的健壮性分析非常值得去研究。该文介绍了当今操作系统健壮性的4种基准程序测试的主要方法,重点介绍健壮性基准测试的工作原理,采用Ballista工具对Linux系统进行了健壮性测试,并对所测数据进行相应的分析。     

Development of a measuring method for several types of programmed tool paths for NC machine tools using a laser displacement interferometer and a rotary encoder

Many circular motion measuring methods for NC machine tools have been proposed, however, the drawback common to many of these methods is the restriction on the radius size due to the short measuring range of the displacement transducers used. Moreover, most of these measurement tools are specialized, and can only perform circular test path measurements. A circularity test method using a laser displacement interferometer and a rotary encoder has been developed. The measuring method features a much longer range of motion than ordinal circular test methods such as the double ball bar (DBB) method and, therefore, the radius restriction on these measurements is greatly reduced. Moreover, this measuring system can also be used for the evaluation of positioning accuracy and other more complex test paths.

The proposed device consists primarily of a laser displacement interferometer and a rotary encoder. The holders for the interferometer head and the retroreflector are connected with a stainless steel rod. The retroreflector holder has a synthetic resin linear bearing allowing it to move relative to the interferometer head so that both optical components are always facing each other. The laser interferometer measures the change in distance between the interferometer head and the retroreflector, and the rotary encoder measures the rotation angle of the stainless steel rod.

In this paper, the background, measuring principle and apparatus structure are briefly described. The experimental setup is also presented. The apparatus was employed in several measuring experiments, including circularity tests for a vertical machining center. The results from these experiments support the validity of this measurement apparatus.     

A manufacturing model of helical groove on rotary burr and a universal post processing method

A systematic machining theory and precision method to determine cutter location in a grinding system is presented for rotary burr. First, the helical cutting edge on various kinds of revolving surfaces is built. Then, based on the geometry model of the helical cutting edge, the smooth spiral rake surface with constant normal rake angle and flank surface can been formed during the one-pass grinding process by this method. No interference between the grinding wheel and workpiece happens by the wheel special rotation. The method has the characteristic of detaching the grinding wheel path solution from specified machining conditions. The grinding wheel path is suitable for different NC machine tools through post processing. Meanwhile, a mechanism kinematic model of the NC machine tool is built, and a generalized algorithm for post-processing of multi-axis NC machine tools is presented. This model is applied to arbitrary configuration of NC machine tool, and the motion value for each axis will be generated by the inputting structure and motion parameters of the machine tool. The model, together with the machining method mentioned in this paper, make the calculation and generation of the grinding wheel path simpler and universal. At last, the validity of the method given in the paper is identified by an example of grinding.     

漳泽发电分公司煤量计量系统问题分析

分析了山西漳泽发电分公司所使用的皮带秤煤量计量系统在应用中发现的问题,并进行了原因分析,提出了处理方法。     

转动惯量的测量及误差分析

转动惯量的测量是质量特性参数测量的一部分,该单元利用扭杆组成扭摆振动系统,光电传感器提取扭摆机构摆动周期信息,测量系统进行数据处理,并在显示器显示测量结果。文章阐述了转动惯量测量工作原理,推导了所需的计算公式,分析了产生测量误差的因素,进行了定量精度分析。