Design and Implementation of Fuzzy Sliding-Mode Controller for a Wedge Balancing System

In this paper, we address the design and implementation of fuzzy sliding-mode controller for balancing a wedge system. At first, we examine the mathematical model of the wedge balancing system. The dynamic system is complex and ill defined; hence we propose the fuzzy sliding-mode control (FSMC) method to achieve the control objective. The proposed control method enhances the ability of fuzzy logic control so that the minimal number of fuzzy inference rules is systematically obtained even the plant parameters are unknown. Both computer simulations and real-time experiments are exploited to demonstrate the validity and feasibility of the developed control scheme.     

Tribological behavior of sialon ceramics sliding against steel lubricated by fluorine-containing oils

The friction and wear behavior of sialon ceramics sliding against steel and lubricated by perfluoropolyethers (PFPE), tetrakis (3-trifluoromethylphenoxy)-bis(4-fluoro-phenoxy)-cyclotriphosphazene (X-1P) and ionic liquid (1-methyl-3-octylimidazolium tetrafluoroborate, coded as L108) were investigated. It was found that the three fluorine-containing lubricants reduced friction coefficient and wear volume effectively. The effectiveness of the three lubricants in reducing wear volume could be ranked as L108>X-1P>PFPE. The antiwear films mainly consisting of organic oxyfluoride or carbonfluoride species and silicon fluoride are all observed for the three lubricants, while the degradation of PFPE during friction might account for the higher wear volume therewith. The lowest friction coefficient 0.065 was recorded for L108 under load of 0.5–400 N. This is dependent on the physically adsorbed ionic liquid on the rubbing surface and the formation of BN under the harsh conditions.     

油酸改性纳米ZrO2粉体及其机制研究

采用水热法制备了平均粒径小于10nm左右的氧化锫.用油酸对纳米ZrO2粉体进行了表面改性,研究了改性工艺条件中油酸添加量对亲油改性效果的影响.按质量百分比油酸:乙醇:水=l:2:2的比例配制改性剂,油酸添加量为ZrO2的lO%(摩尔分数)时,改性的ZrO2粉体在二甲苯中分散稳定性最佳.通过FT-IR分析表明,油酸与纳米ZrO2是以氢键和共价键两种形式结合,在无机纳米粒子表面形成单分子膜.     

反对称角铺设层合矩形板在不同边界条件下的后屈曲问题

本文以板的无量纲最大挠度为摄动参数,应用摄动法研究了在几种支承情况下,反对称角铺设层合矩形板的后屈曲问题,并以梁的特征函数所构成的广义付里叶级数作为高阶摄动偏微分方程的近似解,本文方法简捷,计算收敛性好、数据可靠。     

热分析在挤拉成型工艺中的应用

本文采用DSC固化实验和SPI凝胶实验的热分析方法,评价挤拉成型工艺中不同树脂反应活性、不同填料、填料用量、引发剂用量、温度对树脂固化性能的影响以及树脂混合物的固化性能。通过热分析寻找合适的工艺参数,从而获得成本较低、效率较高、性能较好的挤拉制品。      

室内热湿环境仿真软件开发

建筑室内热环境仿真软件已成为室内环境研究的重要手段之一.在VB.NET开发平台下,采用高效的计算语言Visual Fortran与Visual Basic混合编程,开发了一套界面友好、计算速度较快、计算结果可视化的建筑室内热环境仿真软件Indoor Thermal Environment Simulation (ITES),并在重庆大学热环境实验室进行了实验,对特定热湿环境下的室内温度分布进行测试,其测试结果与ITES软件的模拟结果相一致.验证了ITES软件对建筑室内热环境仿真模拟的可信性.     

铝型材阳极电泳消光涂料的合成与性能

以丙烯酸酯和聚氨酯为原料,过硫酸钾为引发剂进行乳液聚合得到一种阴离子消光电泳涂料,研究了合成工艺、引发剂用量、反应温度对合成的影响。结果显示,采用半连续滴加法,引发剂过硫酸钾的用量为单体总量的0.6%,反应温度353K得到的乳液性能最优。通过红外光谱确认产物呈现共聚结构,透射电子显微镜结果显示,采用半连续滴加法制备的复合物呈现清晰的核壳结构,加入N,N-二甲基乙醇胺中和丙烯酸树脂上的羧基后,复合乳胶粒出现一定的微相分离。利用所得到的涂料进行电泳后涂膜光泽10(60°)以下,耐热性、耐冲击、附着力等性能达到行业标准,可应用于消光电泳涂料领域。     

Nanocube Superlattices of Cesium Lead Bromide Perovskites and Pressure‐Induced Phase Transformations at Atomic and Mesoscale Levels

Lead halide perovskites are promising materials for a range of applications owing to their unique crystal structure and optoelectronic properties. Understanding the relationship between the atomic/mesostructures and the associated properties of perovskite materials is crucial to their application performances. Herein, the detailed pressure processing of CsPbBr₃ perovskite nanocube superlattices (NC‐SLs) is reported for the first time. By using in situ synchrotron‐based small/wide angle X‐ray scattering and photoluminescence (PL) probes, the NC‐SL structural transformations are correlated at both atomic and mesoscale levels with the band‐gap evolution through a pressure cycle of 0 ? 17.5 GPa. After the pressurization, the individual CsPbBr₃ NCs fuse into 2D nanoplatelets (NPLs) with a uniform thickness. The pressure‐synthesized perovskite NPLs exhibit a single cubic crystal structure, a 1.6‐fold enhanced photoluminescence quantum yield, and a longer emission lifetime than the starting NCs. This study demonstrates that pressure processing can serve as a novel approach for the rapid conversion of lead halide perovskites into structures with enhanced properties.     

基于Genius—Gev阀门参数化设计

分析Gev的参数化设计原理，介绍计算机辅助阀门参数化设计软件的基本功能。     

基于socket的网络通信技术研究

随着计算机网络的发展,网络中主机间的通信变得越来越重要。本文通过对套接字的概念及工作原理的分析,提出了网络通信程序设计的流程,并对实现关键点进行了阐述。根据Sock网络编程原理,设计程序实现了客户-服务器模式(C/S)的网络通信,并对程序实例进行了研究分析。