性能评价方法在ADRC参数整定中的应用

针对自抗扰控制器参数较多、整定困难的问题,提出基于控制系统性能评价的自抗扰控制器参数整定方法.通过闭环系统的扰动-输出传函求解基准函数,对决定自抗扰控制器性能的参数进行优化.实验结果表明,该参数整定方法简单易行,在满足系统性能最优的前提下,能有效提高ADRC的控制效果.     

一种线性自抗扰控制器参数自整定方法

针对线性自抗扰控制器参数难于整定的问题,提出了一种基于动态响应过程时序数据挖掘的参数自整定算法. 算法以线性自抗扰控制器中线性误差反馈律的两个增益信号回路的动态响应为参数调整对象,通过改进变收缩系数的随机搜索算法进行参数整定,记录动态响应过程数据,基于关联关系挖掘得到控制参数调整策略应用于线性自抗扰控制器的参数自整定. 为验证本文提出的参数自整定方法的实际效果,以液压自动位置控制系统为控制对象,分别采用阶跃响应仿真和Monte Carlo实验进行对比研究. 结果表明,基于数据挖掘参数自整定的线性自抗扰控制器动态响应较好,鲁棒性较强,改进了变收缩系数随机搜索算法调整时间较长以及传统线性自抗扰控制器超调较大的缺点,是一种具有实用性的线性自抗扰控制器参数自整定方法.     

基于BP神经网络的三轴增稳云台自抗扰控制

针对三轴增稳云台伺服系统非线性特性,以及PD控制抗扰能力差,自抗扰控制器由于参数众多而导致整定过程耗时且费力的缺陷,本文利用BP神经网络的全局逼近能力和自我学习能力,将其与自抗扰控制器组成复合控制器,对自抗扰控制器的所有关键参数进行自整定寻优,应用于含Stribeck摩擦模型的三轴增稳云台伺服系统。仿真结果表明:该方法用于自动整定参数可行有效,与PD控制和参数固定的常规自抗扰控制器相比,具有更高的控制精度和更强的抗扰能力,对提高增稳云台的性能具有较好的应用价值。     

基于改进粒子群算法优化的自抗扰控制器（ADRC）及其应用

针对自抗扰控制器参数多,不利于整定的问题,提出了一种基于改进的粒子群算法（PSO）的自抗扰控制器参数整定方法。该方法引入了PSO中各个粒子的惯性权值的自适应调整机制,以此来维持粒子的多样性和加速粒子群算法的收敛性。利用改进粒子群算法优化的二阶自抗扰控制器控制主气温控制系统,仿真结果验证了算法的可行性和有效性。     

基于广义反向学习的改进鲨鱼算法自抗扰参数整定

针对非线性自抗扰控制器参数难以整定、很大程度影响控制精度的问题,提出一种改进鲨鱼优化算法的在线整定方式。首先,针对传统鲨鱼算法易早熟收敛陷入局部最优,且算法全局搜索精度低的问题,通过广义反向学习对鲨鱼种群进行初始化,并在鲨鱼位置更新过程中加入非线性控制因子,平衡算法的全局探索能力和局部开发能力,最后在迭代过程中加入Levy变异机制,提高算法跳出局部最优的能力。其次,将改进后的鲨鱼优化算法对自抗扰控制器参数在线整定,并将优化后的自抗扰控制器用于工程实例中,进行仿真实验。实验结果表明,整定后的自抗扰控制器很大程度提高了控制精度和抗扰动能力。     

自抗扰控制器参数整定方法的研究

提出了自抗扰控制器算法参数整定的计算机软件仿真分析和基于参数变换的公式推导两种方法.根据自抗扰控制方程,针对算法中多个参数需要整定的问题,结合工程中控制对象实例,采用Matlab仿真软件逐一确定各参数,寻找同类对象之间的控制参数关系,利用公式得到其他对象的控制器参数.使用Matlab仿真分析法可直观地获取参数,公式推导法则简化了同类对象的参数整定,速度快.仿真实验结果表明,这两种参数整定方法可用于常见的工业控制对象的自抗扰控制器中.     

基于鸟群算法的3D威亚系统自抗扰 控制器的参数优化

针对3D舞台威亚系统自抗扰控制器(ADRC)参数多且难以整定的问题,将鸟群算法(BSA)引入其中对自抗扰控制器的参数进行了优化研究.首先根据自抗扰控制"抗扰范式"的思想,建立了3D舞台威亚系统单点吊机的"鱼骨+鱼刺"模型;接着结合3D舞台威亚的运行性能及ADRC的特质,分析确定了ADRC需优化整定的参数,并基于智能优化算法BSA对ADRC的参数进行了优化整定.仿真结果表明,BSA不仅能克服粒子群算法使ADRC参数易陷入局部最优的缺点,而且运算简单高效且易于实现,经BSA优化后的ADRC改善了3D舞台威亚单点吊机运行性能与鲁棒性,为威亚的同步控制提供了保障.     

基于双空间PSO算法的四旋翼无人机 自抗扰控制器优化设计

四旋翼无人机自抗扰控制器所需的参数较多,传统PSO算法虽然可以对控制器的参数进行有效的整定,但需要的粒子群数量较大,寻优速度也比较慢。本文在传统PSO算法的基础上,根据自抗扰控制器的特点,将所需整定的参数分为两组,从两个空间里分别初始化各自的粒子群,并进行交叉寻优,形成一种双空间PSO算法,对四旋翼无人机自抗扰控制器进行优化。仿真结果表明,相比传统的PSO算法,双空间PSO算法所需粒子群数量少,寻优速度更快,而且经过双空间PSO算法优化后的自抗扰控制器具有更小的误差和更快的收敛速度。     

基于DE算法的自抗扰控制器在并联型APF中的应用

PID控制器难以满足高性能的控制要求,自抗扰控制器不依赖于被控对象的模型,具有很好的鲁棒性、适应性,但其参数众多,不利于设计。本文介绍了自抗扰控制器的结构与工作原理,采用微分进化算法对自抗扰控制器进行参数整定,寻找较优的ADRC参数。在MATLAB/Simulink中,将寻优得到的参数应用于基于自抗扰控制的并联型有源电力滤波器中。静态与动态仿真结果表明,与常规整定方法相比,该方法简单有效,易于操作,提高了抑制谐波的能力,改善了系统的稳态性能。     

基于交叉熵算法的自抗扰控制器参数整定方法

为解决自抗扰控制器参数难以整定的问题,提出基于交叉熵算法的自抗扰控制器参数优化设计方法。通过适应交叉熵算法选择适应度函数,对其中的五个重要参数β01、β02、β03、β1、β2进行了优化分析。仿真结果表明：交叉熵算法比免疫遗传算法的自抗扰控制器超调量更小,响应时间更快。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with