回转窑筒体圆度检测

本文介绍根据２４００×３８０００ｍｍ规格的回转窑技术条件，设计制造了筒体圆度检测工具以及所采用的检测方法，并以测量能力指数Ｍｃｐ值衡量筒体圆度检测能否满足要求，从而科学评定筒体质量。     

应用激光经纬仪找正回转窑筒体

应用激光经纬仪找正回转窑筒体刘德仁（中建二局安装公司唐山０６３０３０）０工程概况长春双阳水泥厂Φ４ｍ×６０ｍ回转窑的斜度为３．５％，设有３个支座，日产水泥熟料２０００ｔ。回转窑由９段节组成，有８道焊口，为了减少高空作业，先在地面组对成５大段，然后将剩...     

基于三点法的回转窑轴线在线测量系统

论述了一种基于三点法的大型回转窑轴线在线测量新方法,该方法不仅能够测得回转窑筒体回转中心的动态变化情况,同时还可以测取轮带和托轮的直径以及它们的变形情况。应用该方法,设计研制了一种新型大型回转窑运行轴线动态测量系统,由基于ATmega128单片机的下位机数据采集系统和基于PC机的上位机数据分析处理系统共同构成,通过USB口实现上下位机的通信。该系统具有结构简单、安装使用方便、测量精度高等特点。     

回转窑冷热态中心线变化初探

水泥厂回转窑热态中心线保持一条直线，是理想的运转状态。本文从定性、定量两个方面分析冷热态筒体中心线的变化，提出了冷态安装时的改进建议。     

大型回转窑筒体组对、找正技术

随着回转窑筒体安装要求和施工精度的提高,在工程中使用“太极图法”对窑筒体组对和找正。此方法直观,容易操作,减少误差,从而保证了安装的质量。     

基于图像处理的回转窑火焰温度测量技术研究

在烧结法生产氧化铝过程中,为监控回转窑内部燃烧状况,提高熟料质量,采用了数字图像采集与图像处理的方法,并通过对燃烧火焰和烧成熟料图像的数据分析与平滑滤波,得到火焰强度和熟料等级两个数字化特征值,为回转窑的操作优化和自动控制提供了可靠的依据.     

水泥回转窑窑体的焊接施工技术

本文对回转窑窑体焊接技术进行了总结。可为施工企业进行同类型设备施工提供相关技术参考。     

水泥回转窑二次风温测量误差分析

回转窑的气流温度是非常重要的热工参数。本文以二次风温为例 ,应用传热学原理研究了抽气热电偶的静态测温误差和动态响应特性。此研究结果不仅可用于热电偶信号的校正 ,也可为回转窑热工参数的在线控制提供科学依据。研究成果已成功应用于多家水泥厂回转窑 ,并取得良好的效果     

NSP窑筒体防腐蚀措施研究

我国的ＮＳＰ窑外分解窑多以煤为燃料，各厂家筒体腐蚀的部位、程度各不相同。我们针对冀东水泥厂、珠江水泥厂两种典型情况进行了分析，并做了一系列模拟试验，找出了筒体腐蚀与窑内气氛的关系，并提出了相应的防腐蚀措施。１筒体腐蚀现象冀东水泥厂４．７ｍ×７４ｍ回...     

Fatigue reliability analysis of kiln welded shell

This paper presents a probabilistic reliability method for the welded shell during crack growth. The crack growth model incorporated with a failure assessment diagram, which provides a better estimation of the critical crack depth, is developed to describe fatigue failure. All variables used of particular welded joints are studied. The stress variables are based on resultant stress calculated by using the finite element (FE) code ANSYS. Fatigue reliability analysis of the welded shell is performed by using the Monte Carlo simulation method. It is demonstrated that fatigue reliability analysis is significantly useful for the repair schedule of shell cracks.     

The dynamic error of a multichannel measurement system

It is shown that the dynamic error of a multichannel measurement system containing a single analog-to-digital converter with signal source switching is not dependent on the signal waveform and is governed by the rate of change. Translated from Izmeritel’naya Tekhnika, No. 1, pp. 3–6, January, 2009.     

基于光纤延迟线的时间抖动测量系统

对飞秒激光器时间抖动的准确测量是推动其高精度应用的重要前提。为实现时间抖动的高精度、无参考测量,设计并搭建了一套基于光纤延迟线的测量系统。基于非对称迈克尔逊干涉仪的结构,在其中一臂引入一段长光纤延迟线鉴别时间误差,提高时间抖动测量精度。测量了一台实验室自制的重复频率为82 MHz的锁模光纤激光器的时间抖动功率谱,其在100 Hz~10 kHz的积分范围内RMS时间抖动为10.1 fs。     

Assembly line system dynamic behaviour for high priority job order processing

Very often in a manufacturing plant, an important job order must be processed with higher priority than other regular jobs. It is vital for management to understand the impact on production performance of these high priority job orders. In this paper, this dynamic behaviour of assembly line systems is studied using computer simulation and derived metamodels in the form of mathematical expressions. An extensive computer simulation study is first conducted off-line. Next, analytical representations of the system lmetamodels) are fitted to the dynamic behaviour as simulated. These relatively simple equations can then be used on-line to estimate the impact of high priority job order processing when it occurs. The results indicate that the system response to this dynamic event can be described by first-order exponential delay functions captured in metamodels from simulation results. Using only the metamodels, the finish time of high priority jobs can be predicted and the number of delayed regular assembly products can be estimated in real time in the shop floor. This information is very valuable and useful for production scheduling.     

波纹扁球壳的非线性动态屈曲

研究了用于传感器弹性元件波纹扁球壳的非线性动态屈曲问题。建立了波纹扁球壳的非线性振动微分方程,根据突变理论建立了该壳体动态屈曲的突变模型,得到了动态屈曲的临界方程。     

Sandwich shell finite element for dynamic explicit analysis

The contribution of this paper consists of new development of transverse shear stresses through the thickness and finding an expression for the critical time step for explicit time integration of layered shells. This work presents the finite element (FE) formulation and implementation of a higher‐order shear deformable shell element for dynamic explicit analysis of composite and sandwich shells. The formulation is developed using a displacement‐based third‐order shear deformation shell theory. Using the differential equilibrium equations and the interlayer requirements, special treatment is developed for the transverse shear, resulting in a continuous, piecewise quartic distribution of the transverse shear stresses through the shell thickness. Expressions are developed for the critical time step of the explicit time integration for orthotropic homogeneous and layered shells based on the developed third‐order formulation. To assess the performance of the present shell element, it is implemented in the general non‐linear explicit dynamic FE code DYNA3D. Several problems are solved and results are presented and compared to other theoretical and numerical results. Copyright © 2002 John Wiley & Sons, Ltd.     

Laser dynamic goniometer measurement algorithms

Measurement algorithms are compared for laser dynamic goniometry. When one uses an algorithm for balancing out the generalized zero shift, there is a reduction in the effects of instability in the rotational velocity of the ring laser as regards the systematic and random components of the measurement error with a laser dynamic goniometer. __________ Translated from Izmeritel’naya Tekhnika, No. 1, pp. 17–20, January, 2008.     

基于动态测试技术的战术导弹测控系统设计

阐述了基于PXI总线和LabWindows/CVI软件平台的战术导弹测控系统的研制方案,并从导弹控制系统分析、设计和动态性能评估的角度出发,提出了动态测试思想,并创意性的提出了将系统中单一的目标灯替换为目标灯点阵,按导弹运动轨迹,控制目标灯点亮的时序这一思想,最后利用控制指令算法对该思想进行了验证。使用证明,该系统工作可靠,检测维修自动化程度高,测试功能齐全、容错能力强,具有良好的开发拓展功能。     

干法水泥回转窑监控系统设计

主要介绍西门子DLC＋WINCC＋PROFIBUS监控系统在小型水泥干法回转窑生产过程控制中的应用,并着重讨论了窑头控制系统的总体硬件结构和相应监控方案。