一个高速开关阀控液压系统的模糊控制研究

本文设计了一个采用高速开关阀控制的液压缸位置控制系统，该系统便于和微机接口实现数字控制。本系统运用PWM技术和模糊控制技术，实现了系统的精确控制。仿真结果表明，该控制器具有快速响应性和好的稳定性。同时也表明了采用模糊控制方法可以有效的解决一类非线性系统的控制。     

Ka频段卫通相控阵封装天线设计与实现

针对卫星通信对终端天线低剖面、低功耗、极化可变及发射控制等需求,采用平板相控阵架构、极化可变阵列、稀疏布阵等技术,研制了一台基于单板集成封装技术的Ka频段卫星通信相控阵天线。该天线满足高轨同步卫星宽带应用需求和适航符合性验证试验DO-160G要求,经长时间跑车和飞行试验,其性能优良,可靠性高。     

Automobile active suspension system with fuzzy control

A quarter-automobile active suspension model was proposed. High speed on/off solenoid valves were used as control valves and fuzzy control was chosen as control method.Based on force analyses of system parts, a mathematical model of the active suspension system was established and simplified by linearization method. Simula-tion study was conducted with Matlab and three scale coefficients of fuzzy controller (kc,kcc,ku) were acquired.And an experimental device was designed and produced. The results indicate that the active suspension system can a-chieve better vibration isolation performance than passive suspension system, the displacement amplitude of automo-bile body can be reduced to 55%. Fuzzy control is an effective control method for active suspension system.     

吸扫式清扫车工作参数匹配研究

吸扫式清扫车的工作参数对其清扫效率和清扫能力有决定作用。开展了清扫车工作参数与清扫性能试验,获取了清扫车速度、风机工作流量、盘刷转速和垃圾分布密度与清扫效率的作用规律,开展了清扫车工作参数正交变量试验。试验结果表明:工作参数对清扫效率的主次顺序为风机流量、清扫速度、盘刷转速、垃圾分布密度。进行了不同参数组合下吸扫式清扫车清扫效率试验研究。采用线性拟合的方法建立了清扫车清扫效率计算公式。采用求解极值的方法获取了清扫车的最大清扫效率。提出了清扫车工作参数匹配规律:当风机流量为760 m3/h,清扫速度为5.5 km/h,盘刷转速为120 r/min时,清扫车具有最佳工作性能。     

PET-CT双模图像配准

目前,医疗图像设备层出不穷,各种图像格式相继诞生.医疗图像所包涵的信息丰富程度和准确度直接影响到医生诊断治疗的结果.此篇文章以提供信息更为丰富、更为准确的多模图像,以便于医生临床的诊断治疗为目的,应用了刚性校正与双线性插值算法,以及聚类算法实现单模态PET与PET图像之间的配准,CT与CT图像之间的配准,与PET-CT图像的双模配准, 这些方法在实际临床医学应用中有着重要的用途,对医生判断病灶的情况和确切位置有很大的帮助.     

Concentrated and gastight sampling technique of deepsea microplankton

A new sampling method of deepsea microplankton with function of in-situ concentrated sampling and gastight sampling was proposed. In-situ concentrated sampling technique was realized as follows: a microplankton membrane was used as filtration membrane, and a deepsea pump was used to pump seawater; the microplankton was captured and the density of microplankton was increased when seawater flow through the filtration membrane. Gastight sampling technique was realized as follows: a precharged accumulator was used as pressure compensator. During the process of lifting the sampler, the accumulator compensated the pressure drop continuously. The laboratory experimental results show that with in-situ concentrated sampling technique, in-situ concentrated sampling can be realized and the maximum concentration ratio reaches up to 500. With pressure compensation technique based on accumulator, gastight sampling can be realized. When sampling at 6 km and the precharge pressure of accumulator is 18 MPa, pressure drop of the sample is less than 2% compared with its original pressure. Deepsea experiment (at 1.9 km) results show that the sampler can realize in-situ concentrated sampling and gastight sampling.     

公路测量的GPS应用技术

GPS（Global Positioning System）全球定位系统尤其是实时动态（RTK）定位技术在公路测量中蕴含着巨大的技术潜力,本文概述了GPS的系统组成与其测量技术的原理,主分析了实时GPS测量技术的特点及其在公路测量中的应用。     

宽带激光二倍频特性的理论分析

在激光核聚变(ICF)物理实验中,采用相干度较小的宽带倍频激光,能有效抑制高阶非线性效应和提高靶的激光辐照均匀性。根据不同频率成分和频耦合原理,建立了宽带二倍频转换的物理模型,作了理论计算分析,发现二倍频光的光谱变窄,结果对宽带三倍频研究具有一定应用价值。     

超成型器用于多圆网纸板机

我厂25t／d1600多圆网纸板机1994年初技术改造时，应用笔者设计、本厂自行制造的4套超成型器替换了原来的圆网成型器。经一年的生产实践表明：超成型器十分适合各类纸板的生产，达到了改善产品质量、提高设备生产效率的技改目标，经济效益显著。并且该成型器还具有结构简单，操     

深海环境下射流性能仿真

建立适用于深海作业的高压射流喷嘴的流体动力学仿真模型,对深海环境下喷嘴射流的内、外部流场性能进行数值仿真分析,得到5MPa、10MPa和15MPa三种典型围压环境下喷嘴内部射流压力和速度的变化规律及射流离开喷嘴后的压力和速度变化规律,并与非淹没状态下射流的性能进行对比研究。研究结果表明:通过数值仿真可以获得深海环境下喷嘴射流的工作性能,仿真结果与理论计算结果吻合;随着海水围压的增加,喷嘴射流出口的最大速度相应下降;当喷嘴射流出口喷射速度一定时,深海围压的大小对射流性能基本没有影响;不同围压下的射流形成的等速核外形和靶距基本相同,深海最优作业喷距为3~5倍喷嘴出口直径;与非淹没环境相比,淹没状态下射流沿轴向速度衰减梯度变化迅速,其等速核长度缩短约40%。