工业锅炉房CAD系统的设计与实现

介绍工业锅炉房ＣＡＤ系统的组成与结构，给出了用ＡｕｔｏＣＡＤ进行二次开发的一般方法，提出了从三维工程模型到二维工程图的开发方法，使系统具有一定的智能化水平。     

高精度多路电压采集系统

针对高精度、低成本多路电压测量系统的高精度、智能化、抗干扰和网络化的要求,介绍以单片机为下位机控制核心,用LabVIEW编写上位机监控程序的电压采集系统的设计方案。     

CCD外径测量及控制

介绍ＣＣＤ在线测量控制管、线材直径的方法。ＣＣＤ外径测量及控制系统根据光学成像原理,利用线阵ＣＣＤ器件采集图像并用单片机进行处理,具有数据显示、控制输出及报警输出等功能。该系统测量范围为０～６０ｍｍ,测量精度为０．０１ｍｍ,控制输出为０～１０Ｖ或４～２０ｍＡ。     

陶瓷厂电气CAD智能软件开发初探

本文介绍了ＣＡＤ在陶瓷厂供电设计中的应用。着重讨论了在陶瓷厂特定条件下ＣＡＤ图形库、自动布图、电气参数自动选择等功能的实现,高级语言与ＡｕｔｏＣＡＤ的接口和人机界面等问题,并探讨了实现软件智能化的途径。     

容量４.7GB DVD—RAM驱动器的开发

开发了ＤＶＤ－ＲＡＭ驱动器,其容量与ＤＶＤ－ＲＯＭ（Video)相同（４.7GB),录和读出时的传输速率为２２．１６Mbps,该驱动器过新开发的单镜集成化记录用光头,光道中心控制／倾斜控制及加强的记录系统学习功能,实现了４．７GB的高密度记录所要求的功能,如高精度控制及容性,适应盘片各种变化的稳定的记录性能,而且,该驱动器还兼容２．６ＧＢ ＤＶＤ－ＲＡＭ盘的记录／读出,ＤＶＤ－ＲＯＭ和ＣＤ－ＲＯＭ盘的的读出。     

陶瓷厂电气CAD智能软件开发初探

本文介绍了ＣＡＤ在陶瓷厂供是设计中的应用。着重讨论了在陶瓷厂特定条件下ＣＡＤ图形库、自动布图章民气参数自动选择等功能的实现，高级语言与ＡｕｔｏＣＡＤ的接口和人机界面等问题，并探讨了实现软件智能化的途径。     

塑料注射模具CAD技术

本文介绍了在微机上开发塑料注射模具计算机辅助设计（ＣＡＤ）的技术，侧重介绍塑料材料的智能化选择系统与注射模具冷却水道的计算机辅助设计。     

旋流数为0.1的强旋湍流两相流动的PDPA实验

采用相位多普勒颗粒测速仪（ＰＤＰＡ）对旋流数为１．０的轴向和切向进风的圆柱形旋风筒内强旋湍流气粒两相流动进行了测量研究，并与旋流数为０．４７、１．５和２．０８的实验结果进行了对比分析，指出了旋流数变化夺两相流场及两相湍流特性的影响。     

RD-800 SCADA/EMS系统设计及其工程实践

介绍ＲＤ－８００ＳＣＡＤＡ／ＥＭＳ系统的系统结构、系统平台、硬件结构、软件结构、数据库系统等，及工程实践应用。     

反射太阳热涂层屏蔽辐射热的自动检测系统

介绍了用于测量反射太阳热涂层表面温度和涂有反射太阳热涂层贮罐内装液体温度的自动检测系统。该系统由计算机系统、温度传感器、Ａ／Ｄ转换器、多路开关、光源和测量台等部分组成，能较好地测量和记录即时温度值和升温曲线。     

Method to Characterize the Air Flow and Water Removal Characteristics during Vacuum Dewatering. Part I—Experimental Method

An experimental method using a novel design to characterize the air flow and water removal during vacuum dewatering in paper manufacturing is discussed. The experimental setup involves the intermittent application of vacuum, similar to commercial systems, using a rotating disk with slot opening arrangement. The system is capable of commercially realistic residence times of the order of milliseconds. The intermittent application of vacuum simulates vacuum dewatering on commercial paper machines. The air flow rate is calculated from changes in pressure and temperature in the vacuum tank underneath the sample. The role and importance of air flow during vacuum dewatering is studied by accurately measuring the air flow, properly taking into account the leaks during vacuum dewatering. The method described here provides for the first time accurate air flow and water removal data during vacuum dewatering. Methods of analysis of the experimental data are also presented. This information can be used to better understand the water removal process as well the role and importance of air flow during vacuum dewatering.     

Method to Characterize the Air Flow and Water Removal Characteristics during Vacuum Dewatering. Part I—Experimental Method

An experimental method using a novel design to characterize the air flow and water removal during vacuum dewatering in paper manufacturing is discussed. The experimental setup involves the intermittent application of vacuum, similar to commercial systems, using a rotating disk with slot opening arrangement. The system is capable of commercially realistic residence times of the order of milliseconds. The intermittent application of vacuum simulates vacuum dewatering on commercial paper machines. The air flow rate is calculated from changes in pressure and temperature in the vacuum tank underneath the sample. The role and importance of air flow during vacuum dewatering is studied by accurately measuring the air flow, properly taking into account the leaks during vacuum dewatering. The method described here provides for the first time accurate air flow and water removal data during vacuum dewatering. Methods of analysis of the experimental data are also presented. This information can be used to better understand the water removal process as well the role and importance of air flow during vacuum dewatering.     

气体通过颗粒层突破压力和达西渗透率的关系

对空气通过窄筛分球型颗粒层和窄筛分沙粒在水中自然沉积层孔隙率和突破压力进行实验,发现随着多孔颗粒层内的流通通道的微细化,即使在常压下,气流也会出现速度滑移的稀薄性效应,并且颗粒越小速度滑移的影响越显著,使得实验测量结果不再与平均粒径(或平均孔隙直径)的平方成正比,而受制于Kn_p数的大小.给出了考虑这种速度滑移影响的数据综合方法.     

Online monitoring and analysis of resin pressure inside composite laminate during zero‐bleeding autoclave process

Resin pressure is one of the most important parameters in manufacturing composites during autoclave process. It not only greatly influences resin flow behavior, but also has effects on void formation and elimination. Online monitoring resin pressure can provide an important guidance for the optimization of the processing parameters and the control of the quality of composites. In this study, a resin pressure online measuring system for autoclave process was established based on the principle of pressure transfer in liquid, and the size of the measuring probe of the system was optimized to increase the accuracy of measured resin pressure. The results indicate that the accuracy and the dynamic response of the system can meet the requirements of resin pressure measurement during autoclave process. Furthermore, by means of this proposed resin pressure measuring system and the measurements of compaction properties of the fabric stacks, the resin pressures inside carbon fiber fabric/epoxy resin and glass fiber fabric/epoxy resin prepreg stacks during autoclave process were investigated, especially for the zero‐bleeding process which is prevailing for aircraft composite structures. It is demonstrated that during zero‐bleeding process, the resin pressures, which conform to the spring and piston model, uniformly distribute along through‐thickness and in‐plane directions. In addition, the resin pressure profile is significantly influenced by the fiber volume fraction of the prepregs, indicating that fiber content of prepreg should be optimized for achieving free defects and uniform fiber distribution. POLYM. COMPOS., 2011. © 2010 Society of Plastics Engineers     

水平管路油气混输模拟技术

以双流体模型为基础,建立了适用于水平油气混输管路的瞬态数学模型,并讨论了模型的求解以及分层流的结构方程对计算结果的影响。在大型多相流实验环道上进行了大量的混输瞬变流动过程实验,利用实验和现场数据对瞬态模型模拟得到的混输管道中的平均持液率、压降以及瞬变过程的入口压力、持液率等流动参数等进行了验证和计算,结果表明建立的模型可以比较准确地预测油气混输管路中的流动参数。     

吸附条件下二元冰制备

搭建了真空制冰动态特性实验台,在相同起始温度、预设压力下改变喷射流量,通过对闪蒸室内温度、压力等参数的采集,分析了流量及固体吸附模块对动态二元冰制备过程的影响。研究表明流量越大平衡态压力越低,平衡时闪蒸室内温度基本不变,维持在0℃左右;通过对含冰率的测定发现过高流速并不利于冰晶的生成,较低喷射速度下成冰率相对较高;吸附条件下易形成动态平衡环境,且更有助于维持较低的平衡压力。     

Current efficiency in the chlorate cell process with an oxygen cathode (III): a gas analysis method for chlorate current efficiency

An original chlorate cell system equipped with an oxygen cathode, a DSA® and a separate reactor was set up. A method for determining the current efficiency by means of measuring the flow capacity of cell gas in the chlorate cell process has been proposed. This method is simple and convenient as well as accurate in evaluation of the chlorate current efficiency in the chlorate cell with an oxygen cathode, compared to the traditional method of analysis. The current efficiency of the anode can be estimated with the gas analysis method.     

Resin flow monitoring inside composite laminate during resin film infusion process

In this article, a novel method of measuring resin flow front under vacuum condition is presented. The in situ monitoring system with metal hollow probe based on gas flow balance can be used in resin film infusion (RFI) process, where resin film is used and transverse flow is dominated along thickness direction of fiber preform. The diameter of the probe was chosen to increase the measuring accuracy, and the reliability of the method was evaluated by comparison of visualization experiment. Experimental results demonstrate that the method is suitable for monitoring resin flow in RFI process with and without autoclave, and can obtain the information about resin filling time, nonuniform flow front, and the permeability of fiber preform. Furthermore, by means of the established monitoring system, the influences of pressure and lay‐up sequence of carbon fiber fabric on epoxy resin flow during RFI process were investigated. In addition, resin flow pattern with changing viscosity of epoxy resin was studied. POLYM. COMPOS., 35:681–690, 2014. © 2013 Society of Plastics Engineers     

Non-isothermal laminar pipe flow — II. Experimental

In a previous article [1] theoretical predictions of velocity distributions, pressure drops and mean Nusselt-numbers are given for non-isothermal pipe flow of power-law fluids having a temperature dependent consistency-index. In the present investigation these solutions are checked for Newtonian fluids with extensive experimental data.A flow visualization technique was used for measuring the non-isothermal, laminar velocity profiles of glycerol in a round tube. Furthermore, accurate pressure drop measurements were carried out for non-isothermal tube flow of a viscous. Newtonian liquid. Finally logarithmic mean heat transfer coefficients were measured in laminar flow heat transfer.The experimental velocity profiles, pressure drops and heat transfer coefficients show a good agreement with those predicted theoretically.     

一种新的差压式流量计标定方法

针对目前差压式流量计标定方法计算公式复杂,实流测量误差较大,为提高精度仍需实测校验的问题,经过对标定方法的研究,提出了广义流出系数的概念,根据流量和差压开方的比例关系,提出的新方法标定时无需经过流量公式计算,仅需一次实流校验即可标定流量计。该方法标定精度比传统法高出3~5倍,简化了标定方法,提高了测量精度。