MATLAB软件在线性代数教学中的应用

MATLAB是国际上流行的科学与工程计算软件,线性代数课程是大学教育的一门重要基础课。将MATLAB软件与线性代数教学结合起来,能够大大简化计算的过程和步骤,提高计算效率,激发学生的学习兴趣。文章根据作者自身的教学经验,就MATLAB在线性代数教学中的应用作了详细的阐述。     

基于C#与MATLAB混合编程的机械优化设计应用研究

本文通过C#与MATLAB进行混合编程设计分析研究,提出一种新的关于机械优化设计运算的程序算法。同时借助MATLAB生成COM组件运行算法,C#生成前端代码,经数据结果表明,成功实现关于C#与MATLAB的集成实现计算方法:一维搜索试探方法、坐标轮换法、惩罚函数法。本算法将能够实现输入范围区间、函数等参数,可以选择多种不同算法得出迭代过程中的函数搜索区间变化等核心数据,同时本算法实用性强,减少机械优化设计中繁琐的计算步骤,从而优化计算。     

MATLAB在井下电网短路计算中的应用

矿井低压电网两相短路电流计算,在工程上主要采用查表法进行。当电缆的换算长度和变压器容量无法查到时,就需要采用插值法。利用MATLAB编写插值程序,会使计算过程更为简单。     

MATLAB在污水管道水力计算中的应用研究

文章提出一种应用MATLAB进行污水管道水力计算的方法,给出一个计算实例,并对该方法的优越性进行分析和讨论。最后指出使用MATLAB进行水力计算,速度快、效率高,有利于设计方案的优化,是给排水科学与工程从业者应用计算机进行污水管道水力计算的理想工具。     

基于人机交互界面的雷达总体设计仿真介绍

MATLAB在雷达总体设计人员进行雷达系统仿真中已得到了普遍应用,文章采用MATLAB GUI人机交互界面工具对雷达总体设计中涉及的雷达信号处理、威力计算等过程进行了仿真。试验结果表明该仿真软件界面友好、方便可靠,为雷达总体设计人员提供了良好的设计平台。     

MATLAB在优化方案选择中的应用

MATLAB具有强大的数学计算能力,其优化工具箱又为优化计算提供了很大的方便。本文结合生产实际和市场需求建立了数学模型,并利用MATLAB优化工具箱进行了优化计算。优化结果十分明显,可有效节约成本。     

MATLAB在自动控制系统中仿真中的应用

MATLAB语言作为主要面向数值计算、科学数据可视化以及系统建模和仿真的简捷、有效的编程工具,广泛应用自动控制领域。重点介绍了MATLAB在自动控制理论中的运用,分别对各种环节进行时域、频域、稳定性分析。文章从控制系统的简单环节入手,注重自动控制理论知识在MATLAB中的实现。通过计算机MATLAB辅助分析,可以很方便地对控制系统进行仿真设计,也可以作为辅助教学的课件。     

六关节工业机器人工作空间及轨迹规划仿真

利用MATLAB软件对六关节工业机器人的工作空间进行虚拟仿真分析,并推导机器人的工作空间;采用五次多项式进行插值计算对工业机器人的轨迹进行规划,并运用MATLAB软件对工业机器人轨迹规划进行仿真分析。结果表明:六关节工业机器人的工作范围基本能够满足食品包装过程中的工作需要;6个关节的运动都很平滑,各个关节的角度、速度、加速度与时间的曲线比较连续,规划路线比较合理。     

基于MATLAB的纺织工程专业CAI课件的开发

MATLAB是一种科学工程计算的高级语言，易学易用，具有极高的编辑效率。MATLAB不但具有强大的数值计算、符号解析运算、图形功能，其特有的Toolboxs(工具箱)更使其在信号处理、自动控制、神经网络、小波分析、动态仿真、金融     

基于MATLAB的PWM逆变电路的仿真研究

随着电力电子技术的不断发展,与其相应的仿真设计具有十分重要的意义,不仅可以帮助初学者理解电路的工作原理和工作过程,即使对经验丰富的工程技术人员,计算机仿真也是对电路及其控制系统分析、定量计算的强有力工具。本文借助于MATLAB软件对单相桥式单极性调制PWM型逆变电路和单相桥式双极性调制PWM型逆变电路建立动态模型,进行了仿真,对其正确性进行了验证研究,体现了MATLAB仿真具有的直观性、灵活性等优点,为电力电子技术课程的教学和研究起到补充和辅助学习的作用。     

Mass transfer in cellular material at solid–liquid contacting interface

The effective mass transfer (water and solute) and volume shrinkage were measured during solid–liquid contacting process for red beet material tissue under a wide range of process parameters. The mass transfer process of each component in the solid–liquid system is affected not only by operating parameters, but also by the matrix properties of cellular material. The main driving force for the mass transfer phenomena of water out of red beet tissue and sucrose taken into red beet tissue from sucrose solution is attributed to the concentration gradient between external and internal red beet material, and the interaction among water, sucrose fluxes and tissue matrix. The coupled mass transfer fluxes across the interface in an isothermal solid–liquid system were analysed by means of a film model as a function of the concentration gradients, based on the generalized multicomponent mass transfer theories. The relation between individual flux and the independent driving force is nonlinear. The mass transfer model and parameters proposed in the present study is applicable to the unit operation such as osmotic treatment of cellular porous biomaterial.     

Mass Transfer Modeling During Osmotic Dehydration of Hexahedral Pineapple Slices in Limited Volume Solutions

The study of mass transfer during osmotic dehydration process in limited volume solutions was carried out to evaluate the diffusion coefficients of sucrose and water in the osmotic treatment of hexahedral pineapple slices. The experimental osmotic dehydration kinetics for pineapple slices of two different sizes were conducted at 25 °C using a 1:1 solution to fruit weight ratio. The analytical solution of a 3D mass transfer model considering a limited volume of osmotic solution (i.e., an osmotic media of variable solute concentration) was used for describing the mass transfer in osmotic dehydration of pineapple slices. This model was fitted to the experimental kinetics by means of nonlinear regression to obtain the diffusion coefficients. Additionally, the diffusion coefficients were evaluated considering an infinite volume of osmotic solution (i.e., an osmotic media of constant solute concentration). Results showed that the proposed model may be fitted accurately to the experimental osmotic dehydration kinetics and allows the estimation of diffusion coefficients when solute concentration in the osmotic media varies along the process.     

A generalized model for aerobic granule-based sequencing batch reactor. 1. Model development

A generalized model was established for simulating an aerobic granule-based sequencing batch reactor (SBR) with considerations of biological processes, reactor hydrodynamics, mass transfer, and diffusion. Methodology of discretization was effectively used forthe model development and calculations. The activated sludge model no.1 was modified to describe the biological processes within the granules. Based on the difference between the calculated and measured results, the model structure was further improved through introducing simultaneous consumption of soluble substrates by storage and heterotrophs growth with a changeable reaction rate. Model calculations were conducted using a MATLAB program. The calculation results show the respective contributions of granules in different size fractions and slices to the overall change of model component concentrations. Moreover, oxygen concentration profiles within granules and oxygen consumption rate varied in one operating cycle. This confirms the applicability and validity of the discretization method and the model structure.     

基于MATLAB软件的减振弹簧多目标优化设计

减振弹簧广泛用于各种机械装置中,为了实现弹簧轻量化设计以及提高其寿命,应用MATLAB软件对其进行数学建模。并采用统一目标函数法通过简单编程调用MATLAB优化函数对弹簧质量和疲劳安全系数进行多目标优化设计。结果表明：优化后的弹簧质量轻,使用寿命长,并且该法简单易用,为设计人员提供了一种有效的设计手段。     

Heat and mass transfer in combined convective and far-infrared drying of fruit leather

Combined convective and far-infrared drying is a challenging assignment due to complex relationship between heat and mass transfer. In this paper, heat and mass transfer of fruit leather drying with combination of hot air and far-infrared has been carried out. The heat and the mass transfer coefficients were analyzed by heat–mass analogy. It could be found that the ratio between heat and mass transfer coefficients for the combination technique could not be obtained from the heat–mass analogy classical model and a modification is needed. The modified correlations for predicting ratio of heat and mass transfer coefficients and the heat transfer coefficient in term of heat transfer Nusselt number are developed. The model could fit the experimental data quite well within ±10% deviation.     

木工机械用高速电主轴的设计及动力学分析

简要介绍了高速加工的优点和木材高速切削的特点和要求,据此分析了木工机械用高速电主轴的关键技术,然后对木工机械用电主轴进行了结构设计,最后基于传递矩阵法利用MATLAB对所设计的木工机械用高速电主轴进行动力学分析.     

基于溶氧控制的腐乳生产菌生长动力学分析

在10L自动发酵罐上,研究了不同DO值对腐乳生产菌的生长和基质消耗的影响。采用MAT-LAB软件对以上述数据进行最优参数估计和非线性曲线拟合,确定了基于溶氧控制下的菌体生长和底物消耗的动力学模型,在此基础上建立的菌体生长仿真模型能较好地模拟不同溶氧下菌体的生长情况。     

Aquatic passive sampling of herbicides on naked particle loaded membranes: accelerated measurement and empirical estimation of kinetic parameters

Water-sampler equilibrium partitioning coefficients and aqueous boundary layer mass transfer coefficients for atrazine, diuron, hexazionone and fluometuron onto C18 and SDB-RPS Empore disk-based aquatic passive samplers have been determined experimentally under a laminar flow regime (Re = 5400). The method involved accelerating the time to equilibrium of the samplers by exposing them to three water concentrations, decreasing stepwise to 50% and then 25% of the original concentration. Assuming first-order Fickian kinetics across a rate-limiting aqueous boundary layer, both parameters are determined computationally by unconstrained nonlinear optimization. In addition, a method of estimation of mass transfer coefficients--therefore sampling rates--using the dimension-less Sherwood correlation developed for laminar flow over a flat plate is applied. For each of the herbicides, this correlation is validated to within 40% of the experimental data.The study demonstrates that for trace concentrations (sub 0.1 microg/L) and these flow conditions, a naked Empore disk performs well as an integrative sampler over short deployments (up to 7 days) for the range of polar herbicides investigated. The SDB-RPS disk allows a longer integrative period than the C18 disk due to its higher sorbent mass and/or its more polar sorbent chemistry. This work also suggests that for certain passive sampler designs, empirical estimation of sampling rates may be possible using correlations that have been available in the chemical engineering literature for some time.