提高立体仓库自动化水平的Flexsim仿真

以自动化立体仓库的现有设备为基础,提出一些可以提高立体仓库自动化水平的优化措施,在满足正常生产需求的条件下达到了减少仓储储位10%的核心目标.Flexsim仿真模型的运行结果表明:采用优化措施之后比当前运作情况下的单体包仓库最大利用率提高12.36%,多体包仓库平均利用率提高5.32%,整板仓库平均利用率提高1.27%,且工厂对安全存货的需求不受影响.     

声纹识别系统设计

论述了声纹识别的相关概念、应用领域及其区别于其他身份认证的优势,从软件方面构建了一个基于Matlab的声纹识别系统,并对整个系统进行了仿真实验,实验结果表明该系统具有较高的识别率,可应用于有限人群的身份认证。     

基于模糊控制的微型燃机燃料压力控制

针对微型燃气轮机在控制时由于压力不恒定而导致的运行效率低的问题,将模糊PID控制思想运用到控制系统。在传统的PID控制下加入模糊控制,使其PID参数具有在线自整定功能。仿真结果表明,该方法能够很好地提高压力控制效果。     

Interplay Between Wetting and Phase Behavior in Binary Polymer Films and Wedges: Monte Carlo Simulations and Mean Field Calculations

Confining a binary mixture, one can profoundly alter its miscibility behavior. The qualitative features of miscibility in confined geometry are ratheruniversal and shared by polymer mixtures as well as small molecules, but the unmixing transition in the bulk and the wetting transition are typically well separated in polymer blends. The interplay between wetting and miscibility of a symmetric polymer mixture via large-scale Monte Carlo simulations in the framework of the bond fluctuation model and via numerical self–consistent field calculations is studied. The film surfaces interact with the monomers via short ranged potentials, and the wetting transition of the semi–infinite system is of first order. It can be accurately located in the simulations by measuring the surface and interface tensions and using Young’s equation. If both surfaces in a film attract the same component, capillary condensation occurs and the critical point is close to the critical point of the bulk. If surfaces attract different components, an interface localization/delocalization occurs which gives rise to phase diagrams with two critical points in the vicinity of the pre-wetting critical point of the semi–infinite system. The crossover between these two types of phase diagrams as a function of the surface field asymmetry is studied. The dependence of the phase diagram on the film thickness Δ for antisymmetric surface fields is investigated. Upon decreasing the film thickness, the two critical points approach the symmetry axis of the phase diagram, and below a certain thickness Δ_tri, there remains only a single critical point at the symmetric composition. This corresponds to a second-order interface localization/delocalization transition even though the wetting transition is of first order. At a specific film thickness, Δ_tri, tricritical behavior is found. The behavior of antisymmetric films is compared with the phase behavior in an antisymmetric double wedge. While the former is the analog of the wetting transition of a planar surface, the latter is related to the filling behavior of a single wedge. Evidence for a second-order interface localization/delocalization transition in an antisymmetric double wedge is presented, and its unconventional critical behavior is related to the predictions of Parry et al. (Phys. Rev. Lett. 83:5535 (1999)) for wedge filling. The critical behavior differs from the Ising universality class and is characterized by strong anisotropic fluctuations.Invited paper presented at the Fifteenth Symposium on Thermophysical Properties, June 022–27, 2003, Boulder, Colorado, U.S.A.     

基于GIS的供水管网水力计算模型

供水管网是将水从单一或多个水源地输送到用户的管线网络。文中就基于地理信息系统(Geographic InformationSystem,GIS)的供水管网水力计算模型的有关概念、建模方法、理论、实现等问题做了阐述,它将使管网工况分析工作从繁琐耗时变的简单快捷。     

湍流流动及燃烧模拟研究进展

湍流流动往往伴随着燃烧过程。湍流燃烧现象广泛存在于自然界及诸多实际工程问题中，成为近几年的研究热点。现有的相关理论及模型纷繁复杂。本文对该领域研究进行了分类总结、综合评述。可对全面了解研究现状和进一步的发展前景提供方向性的指导和帮助。     

离子交换过程数学模型及仿真研究

根据离子交换原理建立了离子交换系统模型。并以钨离子交换为例。编写仿真软件求解该模型，获得淋洗曲线及各交换参数，通过与实验结果验证，计算机仿真数据与实验结果大致一致。     

撞击式浓淡分离器与弯头组合数值模拟研究

煤粉浓淡燃烧技术在稳燃、防结渣、低NOx排放等方面具有良好的性能,近年来得到了广泛应用。四角切圆锅炉的煤粉管道一般在燃烧器前有弯头,利用数值模拟的方法,分析了撞击式浓淡分离器与弯头间的相互影响,计算了不同弯头与浓淡分离器组合形式下,管道内的流场和煤粉颗粒浓缩效率。