模拟移动床及转阀动态仿真系统

本文研究设计了动态仿真系统的总体结构，并且以Ｐａｒｅｘ过程模拟移动床及其主要系统为背景，开发了动态仿真系统。     

油田开发中油藏数值模拟技术的应用及发展

油藏数值模拟应用数学模型和流体力学方法重现油藏的生产动态,近年来已成为油田开发研究和解决开发实际问题的重要工具。本文对油藏数值模拟技术相对传统模拟技术进行了对比,论述了数值模拟研究步骤,并对油藏数值模拟的发展做出了判断。     

我国不锈钢设备腐蚀研究动态与展望

从电化学技术和腐蚀机理，高温碱液中不锈钢管动态模拟腐蚀研究及新材料、缓蚀剂和涂料三方面，综述了我国不锈钢设备腐蚀研究动态。提出模拟使用条件的加速试验，低成本、可靠的腐蚀控制以及防腐蚀技术的开发与推广是提高经济效益、确保安全生产、防止环境污染的重要手段。     

动态滚动轮胎的有限元模拟

用有限元方法模拟了动态滚动的轮胎。由于轮胎复杂的花纹形状和内部结构对轮胎的性能非常重要，因此在这个模拟中对这些因素建立了精确的模型。一个非常长的运算时间对于建立精确的轮胎模型来说是必不可少的，但是，就实际的轮胎开发而言，由于在计算机硬件、有限元软件以及模拟技术方面进行了许多改进，因此这个模拟的运算时间又是可以接受的。本文介绍了用于模拟的模型，并对在不同的滚动条件下采用该方法对轮胎的几个性能的预测结果进行了说明。模拟结果与实验结果相当一致。因此，这种模拟技术对实际的轮胎开发来说非常实用。     

化工装置动态模拟与优化工艺软件平台

作者在多年工程实践基础上，动用化典流程模拟理论和技术，开发成功通用动态化工流程模拟与优化系统并在工业应用中取得良好效果。     

动态模拟试验的相似研究

全面讨论了动态模拟试验的相似和动态模拟装置的相似设计，提出了动态模拟试验的相似准则及动态模拟试验的结果与现场的关系。     

动态模拟在芳烃抽提装置设计中的应用

运用动态模拟解决工程问题在国外已是一项成熟的应用技术,但在国内的工程设计领域很少采用,国内文献也鲜有报道。文中运用Dynsim4.4动态模拟软件对广西石化90万t/a芳烃抽提装置在设计、开车和标定等阶段进行了动态模拟和分析,协助解决了开车阶段装置压力不稳的问题,优化选择控制系统和安全泄放系统的设计,取得了良好的效果,而实际的装置运行结果也验证了动态模拟的准确性。文中对动态模拟建模的基本步骤、模型调试方法和模拟结果的分析进行了详细阐述,可供设计人员、业主和EPC总承包商参考。     

具有充足底水能量的水平厚油层开发动态模拟

本文通过建立一个具有充足底水能量水平厚油层理想数值模拟模型,在考虑了不同井型、不同射孔层位、不同产液强度和不同纵向渗流能力的情况下,设计了五种开发方案,运用vip油藏数值模拟软件对五种方案的油藏动态进行了模拟与对比,对具有充足底水能量的水平厚油层的开发规律进行了总结,对指导同类型油藏的开发具有一定得指导意义。     

化工过程动态仿真的研究与应用进展

通过介绍化工动态流程模拟系统完全依据机理模型开发并在科研和实际生产中应用的进展,指出了化工过程动态模拟软件开发与应用中存在的一些问题,以及开发和推广通用动态模拟软件的重要性,并对化工动态模拟的发展方向做了预测和探讨。     

模拟胃肠道反应器的参数建立与冷模实验研究

体外消化和发酵实验紧密结合才能模拟完整消化道的功能，现有的模拟胃肠消化和大肠发酵的反应器结构各异且不通用，组合多个独立反应器则增加了实验的复杂程度和设备成本。集成了两类反应器的优势特征，开发了一种采用可编程逻辑控制器（PLC）的模拟胃肠道反应器（GSR），模拟了整体的胃肠道动态特征并与体内数据进行了比较。结果表明模拟胃肠道反应器既可准确模拟胃和小肠的蠕动、排空和混合等动态特征，又可提供肠道微生物的发酵环境。尾气排放和收集装置的设计实现了尾气快速排出和尾气体积的准确计量。模拟胃肠道反应器可为体外探索益生元对肠道微生物作用等研究提供帮助。     

A mathematical model for predicting dynamic behavior of a plasticating extruder

A mathematical model was developed to predict the dynamic behavior of flowrate and melt temperature in a plasticating extruder caused by changes in operating variables such as screw speed, back pressure and barrel temperature. The model has application for on-line computer control of an extrusion process or for simulation purposes off-line. Experimental data for developing the model was obtained from a 2½ in. diameter plasticating extruder producing high impact polystyrene sheet.     

电磁动态挤出机螺杆轴向振动研究

简要介绍了电磁动态单螺杆挤出机的结构性能，分析了螺杆在振动力场作用下的轴向受力状况。通过将实际螺杆简化成广义螺杆的方法建立了螺杆轴向振动力学模型和振动方程，求解得到了螺杆轴向振动的规律。通过对比螺杆轴向振动的试验和理论幅频（幅值和频率）关系曲线，验证了理论分析的合理性，为电磁动态挤出机的动态挤出和优化设计提供了理论依据。     

Effect of the elasticity of the mechanical part of an extruder takeup shaft on the dynamic characteristics of the electric drive

A block diagram of the mechanical part of the extruder drive was developed. The effect of the elasticity of the mechanical part of the extruder takeup shaft on the dynamic characteristics of the electric drive was determined. The ACS quality indexes characterizing the dynamic properties of the extruder control channel were obtained.     

Dynamic model of a plasticating extruder

A theoretical model for the simulation of dynamic operation of a plasticating extruder is proposed. The model can be recommended as a tool to study various dynamic situations of interest in the operation of an extruder. Several responses to changes in operating conditions are discussed. They indicate the occurrence of transient maximas and occasional oscillations. The controlling of flow rate by adjusting a valve at the die seems to cause temporary local high peaks in pressure, whereas its control through screw speed seems to be satisfactory.     

基于动态成型过程的强化分散混炼方法

介绍了基于动态成型过程强化分散混炼的方法以及实现这些方法的动态混炼挤出机的结构及工作原理。这种低能耗强混炼技术包括在单螺杆上增设差动混炼单元、增加物料沿程反馈螺杆以及采用三螺杆劫态混炼挤出机等。     

Design and processing optimization of extruder screws

Only recently has increasing use been made of computer simulation in the field of extruder engineering. This simulation is based on physico-mathematical process models. In order to achieve a closed, process engineering-based extruder layout and operating behavior simulation it is necessary to have models describing the throughput behavior, the melting process, the temperature development, the pressure profile over the screw length, the residence time distribution, the mixing and dispersion processes, and also the torque and power requirements. In the Plastics Technology Section of the University of Paderborn (KTP) a program for the computer-aided design of extruders (R_EX), financed by 17 companies, was developed which will permit rapid application of the models developed there and will fulfill the requirements set out above. Since no computation-intensive numerical methods like Finite Element or Finite Difference Methods (FEM, FDM) are required, the algorithms are very rapid, which means that short computing times are achieved (just a few seconds on an IBM AT).     

Residence time distribution in non-intermeshing counter-rotating twin-screw extruders

This paper deals with the residence time distribution (RTD) in a non-intermeshing counter rotating twin screw extruder. The RTDs were measured in three vent zones of the extruder sparately, and in the adjacent zones combined, using a soluble dye as the tracer. Assuming that the RTDs in the adjacent zones are independent of each other, the overall RTD was also calculated using a previously developed statistical theory. The theory has also confirmed the consistency of the present measurements. A predictive RTD model for the non-intermeshing twin screw extruder, based on the flow analysis of the individual screw zones and their statistical superposition, was also developed. The predictions are in good agreement with experiment.     

Amplitude–frequency characteristics of polymer electro‐magnetic dynamic tri‐screw extrusion

The mechanism of plastic forming and processing in electromagnetic dynamic tri‐screw extruder is very sophisticated and the investigation of amplitude–frequency characteristic acts as the foundation of equipment design and the optimization of polymer processing parameters. A mathematical and analytical model of plastic forming in such extruder was developed and the results were nondimensional‐normalized. To validate the mathematical solutions experiments based on LDPE were carried out and the experimental vibration amplitude and vibration frequency curve was obtained. Three conclusions can be drawn herein: (1) the experimental results hold a good agreement with the calculations, and thus the feasibility of the proposed model is validated; (2) the possibility of resonance closely relates to polymer melt viscosity, rotating speed, and geometry parameters of the screw; (3) resonance of the tri‐screw extruder is seldom observed under normal conditions and there exists an inverse correlationship between vibration frequency and amplitude. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122:1778–1784, 2011     

The operating characteristics of twin screw extruders

The operation of a twin screw extruder processing a powder or granular solid is reviewed. The operating variables of screw speed and barrel temperature profile interact with a number of design parameters— screw design, die geometry, feed zone geometry and with the material properties, in determining machine performance. The factors that determine output and pressure development are specified in a sequence of block diagrams. The dynamic response of an operating machine to disturbances in the steady state conditions is explained in the light of the established relationships and interpreted in conventional control theory terms. Attention is drawn to the importance of mixing in the chambers formed by the screw channels and of the residence time distribution in determining the quality of the final product.     

塑料电磁动态塑化挤出机的节能分析

本文从电磁动态塑挤机出引入振动场实现直接换能方式以后的宏观能量平衡分析入手，在理论上和实验上研究了分析新型挤出机的能分配情况，探讨了新型挤出机的能节原因，为优化设计提供了重要参考和理论依据。