基于PSO的板形板厚小波神经网络解耦PID控制

针对板形控制和板厚控制是相互耦合的综合系统,提出了一种新的解耦PID控制算法·首先用小波神经网络构造α阶时延逆系统,对综合系统进行输入输出解耦;然后对解耦后的独立的单变量系统采用PID控制·这种解耦方法无论是从理论分析还是仿真验证,均证明是可以实现完全解耦的·考虑到被控对象是一个带有时滞的非线性系统,提出采用PSO优化算法对PID参数进行自适应调整·仿真结果表明所用方法简单有效,并具有良好的跟随性能和抗干扰能力;其控制效果优于传统的解耦PID控制·     

基于CMAC和PID的非线性耦合系统解耦控制研究

为了实现多变量非线性耦合系统的解耦控制,提出了一种基于CMAC与PID的复杂关联自适应解耦控制策略,并给出了详细算法。该控制策略采用PID控制器和CMAC控制器共同构成一个复合控制器,多个复合控制器通过多输入多输出线性神经网络,实施对复杂非线性耦合对象的控制作用。由于神经网络的自适应特性,可使得耦合系统逼近参考模型,实现解耦控制。仿真结果表明,该控制策略实现了耦合系统的解耦控制,并且具有较强的抗干扰能力和鲁棒性。因此采用此控制策略能够实现多变量非线性耦合系统的解耦控制。     

确定性多变量非线性系统的在线修正参数预测滤波PID控制

针对确定性多变量NARMAX模型,分析了其可采用PID控制的约束条件。提出一种增量型预测滤波解耦PID控制算法,基于递推参数估计算法对系统模型进行参数估计,采用逐步迭代预报算法进行预测,结合一种可克服算法病态的直接极小化指标函数的自适应控制算法和Robbins-Monro算法,给出了确定性多变量NARMAX模型的具有在线修正参数的预测滤波PID控制算法,因指标函数中含有输出的预测值,故算法具有加快PID控制参数收敛到有效值速度的性能。仿真研究表明,因为所提出的PID算法具有在线修正参数和预测控制的性能,故系统具有较好的控制品质。     

多变量广义预测控制及一种简化算法

推导了多变量广义预测控制算法，该算法能有效地处理过程的不稳定性和非最小相位特性，并具有良好的解耦性能。同时提出一种处理纯滞后对象的新方法，即将近似法和广义预测控制相结合解决时滞的方案。这种方法可以解决通道之间时滞不同的对象，并且针对广义预测控制算法的复杂性对其简化算法（多变量单值广义预测控制算法）进行了研究。通过仿真研究表明，多变量单值广义预测控制算法在跟踪性、鲁棒性、抗干扰能力等方面都得到很好的控制效果。     

苯胺加氢反应过程的多变量解耦广义预测控制

针对苯胺加氢间歇反应具有高度不确定性和交叉耦合性,传统PID控制器很难达到理想控制品质,本文采用阶梯控制策略设计多变量广义预测控制(GPC)解耦控制系统。首先针对系统的交叉耦合性,对目标函数解耦算法进行了简化设计以有效减少计算量;然后利用GPC策略构建一个双输入双输出解耦GPC系统;最后将多变量解耦GPC控制与传统PID变结构控制进行对比分析,模拟仿真效果验证了该控制系统的有效性和强鲁棒性。     

PID神经网络解耦控制技术在VAV中的应用

通过采用PID系统神经元网络解耦控制技术，对耦合强烈的具有变风量空调系统传递函数矩阵形式的4维传递函数矩阵系统进行解耦控制，通过解耦控制仿真研究，可以看出取得了很好的解耦效果，为变风量空调系统（4个回路）的解耦控制提供了有效的方法。     

陀螺稳定平台控制算法比较研究

针对一款实验教学陀螺稳定平台,文章分别采用常规PID控制算法,变参数PID控制算法和变参数自调节模糊PID控制算法对速率环进行控制。仿真结果表明,系统采用变参数自调节模糊PID控制算法响应速度快,超调量小,抗干扰能力强,较常规PID和变参数PID控制算法具有更好的动、静态性能。     

一种基于DRNN神经网络整定的PID解耦控制方法的研究

根据DRNN神经网络的Jacobian信息辨识，提出一种基于DRNN神经网络整定的PID解耦控制方法，并进行了计算机仿真，仿真结果表明：与一般PID解耦控制相比，基于DRNN神经网络整定的PID解耦控制具有响应速度快，自适应能力强，抗干扰能力强的优点。     

啤酒发酵温度多变量解耦控制算法

针对工业过程中常见的多变量时滞输入输出系统,基于常规PID控制和Smith补偿控制算法在处理大时滞、强耦合、多变量、不确定性对象的控制时效果不好的情况,提出了一种多变量解耦控制器的设计方法,该方法以控制器或者补偿器来消除系统各输入输出间的相互耦合和关联,是解决多变量控制问题的有效工具。用该方法针对多变量强耦合的啤酒发酵温度控制系统进行了设计和仿真研究,仿真结果证明了该方法的有效性。     

固体氧化物燃料电池系统仿真分析与控制

固体氧化物燃料电池（SOFC）系统是一个非线性、多变量和强耦合的系统,很难用传统的建模方法来建立。本文基于BP神经网络的方法,利用MATLAB/Simulink平台构建SOFC系统模型,并在该模型的基础上增加PID控制,实现了闭环控制系统的分析。实验结果表明,该模型预测精度高,由预测模型得出的温度数据与实际数据的绝对误差为0.011%,增加的PID控制算法具有很强的抗干扰能力。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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