实现柴油机全程电子调速PID参数整定的仿真研究

在电控LPG-柴油双燃料发动机试验的基础上，建立了全程电子调速器模型。通过动态调整油泵齿条位置实现对柴油机突变负载下转速的闭环控制，从而保证在不同工况下转速的稳定性。同时，模型实现了不同负载下，对PID参数进行整定，并将整定后的PID参数用于LR6105双燃料发动机的参数整定试验。经试验验证，此仿真模型能降低转速波动率，从而减少大量调试工作。     

利用Matlab/Fuzzy Logic进行柴油机电子调速器PID参数模糊自整定设计与仿真

电站柴油机电子调速器PID参数模糊自整定是目前研究的一个方向，模糊控制系统的设计是模糊控制应用中的主要工作，而系统的仿真是设计中的重要步骤和必要的保证。本文介绍了如何利用Matlab中Fuzzy Logic工具箱及Simulink仿真平台进行电站柴油机电子调速器PID参数模糊自整定的设计与仿真。这种方法使模糊控制的设计、仿真及优化变得容易、直观且迅速。     

船舶柴油机转速智能控制系统仿真

以MTU16V396柴油机为对象,建立了柴油机控制系统的简化传递函数和执行器模型。采用PID控制,并利用遗传算法优化控制器参数,对柴油机动态调速过程进行仿真分析,和基于Z-N(Ziegler-Nichols)法的参数整定方法做了比较,结果表明遗传算法的性能远优于传统的参数整定法。     

一种RQV调速器的仿真模型及应用

本文针对RQV调速器进行研究，首次提出了其稳态及动态工作仿真模型并利用该模型对某柴油机进行了应用。应用结果表明：利用该调速器模型可模拟柴油机的稳态及动态工况工作过程，为进一步模拟车辆的动力性和燃油经济性打下相应的基础。     

柴油机电子调速器PID参数模糊自校正研究

提出了对柴油机数字式电子调速器PID参数按调速系统过渡过程进行模糊自校正的原理,并对此进行了仿真研究。结果表明,该方法对提高电子调速器的调速性能有明显效果,对电子调速器适应柴油机过程参数的变化也有一定的改善。     

利用系统仿真法测试电子调速器的性能

用系统仿真法（即采用计算机仿真柴油机,构成一模拟试验装置）考核、测试和分析电子调速器性能,经济、方便且安全。对电子调速器的研制开发、使用维护都有很大的促进作用。对利用系统仿真法考核与测试船用柴油机电子调速器配机性能进行了有益的探索与研究,并采用数字计算机仿真技术,测试了一柴油机电子调速器配机模拟试验装置。初步实验结果表明:该装置能较逼真地模拟电子调速器与柴油机配机的工作情况,并能方便地测取电子调速器的主要性能参数。     

船用大型低速电控柴油机的容积法模型

广泛应用的容积法模型不能直接应用于电控柴油机的仿真.因此,通过改进容积法模型中关于工作过程模块的划分、燃烧放热规律参数和排气阀升程的计算,建立了船用大型低速电控柴油机的动态模型.该模型能够计算柴油机示功图和主要热工参数及其动态变化过程.以7RT-flex60C型电控柴油机为例进行了仿真,结果表明,模型能够较好的预测发动机的稳态性能,具有进行动态仿真的能力,并且计算速度可满足实时北仿真的要求.目前此模型已被应用于船舶动力装置的仿真系统中.     

柴油机电液复合式调速系统建模与仿真分析

建立了柴油机电液复合式调速系统的数学模型,并应用Simulink进行仿真;给出了调速器在负荷突加和突减变化过程中的动态调速特性曲线.重点分析了调速器可调参数对调速系统动态过程的影响,为在调速系统改进设计和运行管理中,采取必要措施以改善系统的性能提供了依据.本文仿真结果与要求精度吻合良好.     

柴油机调劝态过程模拟分析

本文以配Ａ型泵的６１３５Ｑ柴油机为研究对象，建立了柴油机调速系统动态过程的数学模型，通过试验验证了该模型的正确性，并用计算机仿真的办法讨论分析了各参数对动态过程的影响。     

基于GT-POWER的二甲醚柴油机性能研究

利用VB编程算出了二甲醚的物性参数,利用MATLAB算出了GT-POWER中各方程的待定系数,利用GT-POWER建立了柴油机燃用二甲醚的仿真模型。在原机标定转速下,进行了变压缩比、供油提前角对二甲醚发动机性能影响的研究,将仿真数据和实验数据进行了对比。结果表明：二甲醚的物性参数及方程中的待定系数计算正确,ZS1100柴油机燃用二甲醚的最佳压缩比为20,供油提前角对二甲醚发动机性能的影响与柴油相似。     

小型锅炉烟尘测试时锅炉出力的计算

锅炉烟尘测试时,必须对锅炉出力进行测试。但监测中,许多小型锅炉往往不具备相关的计量装置和仪表,为解决这一问题,文章提出了用烟气量和空气过剩系数来计算锅炉的出力的公式,在实际使用中,该方法简单易行,其结果和实测值具有很好的一致怀。     

Unerroric of control of mutual compliance of the efficiency of hydrogen engines of unmanned vehicles in the conditions of mass production

The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO₂ and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized.     

中国煤炭地下气化技术的发展

本文综述了煤炭地下汽化技术的国内外发展现状,对我国“长通道、大断面”煤炭地下气化新工艺给予了技术经济评述,并提出了发展煤炭地下汽化技术的政策建议。     

Review of theory of distortion and disintegration of liquid streams

Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined.     

机车车轮多轴疲劳强度安全评定的研究

使用ANSYS8.0软件对高速列车车轮进行了三维有限元分析,计算出车轮在直线、曲线和道岔条件下牵引、制动共6种工况时孔边薄弱部位的应力,分别通过Mises等效平均应力方法、Sines平均主应力方法和应力分量中考虑平均应力方法计算出应力在极值位置时的等效应力幅、等效平均应力,从而进一步算出车轮的安全系数,对其疲劳强度进行评定,并对3种方法进行了比较研究。     

Constructal optimization of the geometry of an array of micro-channels

This paper documents the geometric optimization of an array of circular and non-circular ducts. The optimization was carried out numerically using finite volume method. As optimal dimensions were independent of the array configuration, the numerical simulation was performed on a unit cell. Numerical optimization for circular, square and isosceles right triangle cross-sections of channels was performed. Based on the results of this investigation, some correlations were proposed to predict the optimal hydraulic diameter and dimensionless heat transfer per unit volume. In addition to examining the effect of pressure drop on these parameters, it was showed that among the different geometries of this study, square cross-section has the most efficiency for a given volume. The numerical results of the present study were compared with approximate results reported in the literature which a good agreement was observed.     

固体热辐射Yong性能分析

本文对漫灰均温物体在常物性条件下对外辐射传热的Ｙｏｎｇ值计算建立了数学模型。通过与物体内能Ｙｏｎｇ公式的数值计算比较,得出了辐射能量的Ｙｏｎｇ值不大于内能Ｙｏｎｇ值的结论。从初步的热射Ｙｏｎｇ值计算公式发现。Ｙｏｎｇ与物体表面辐射率有关。     

MgO膨胀剂细度对MgO水化和水泥浆体膨胀的影响

基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁（MgO）,研究了该型MgO膨胀剂（MEA）细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析（TG DSC）分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。     

Measurements of concentration distribution of hydrogen jet using deflection of center of the laser spot

The main purpose of this work is to propose a new method to evaluate the concentration distribution of the hydrogen jet by using a He–Ne laser through the jet. This research attempts to apply the expression of concentration Gaussian distribution, the refraction formula of inhomogeneous refractive index medium, and the concentration inversion function to disclose the displacement of the center of the laser spot at different heights in the gas jet. The spot images of the laser beam passing through the gas jet at three vertical heights z = 10d, 20d, 30d, and different radial positions are obtained. The radial spatial asymmetry of the gas jet is also found in the experiment. Finally, the calculated concentration distribution curve and the fluent simulation curve, it is found that the two results are very similar. Our findings show that the error between the concentration distribution of this method and the simulated concentration distribution reaches 2.43%.     

汽轮机零件防锈性能的改善

介绍了汽轮机零件的封存特点、防锈要求及防锈油性能对比试验的方法,通过对试验结果的对比分析,客观验证了各种防锈油的性能。试验表明,只有选择了合适的防锈油,才能保证汽轮机零件长期封存的质量。