基于模糊自适应PI控制在TSMC-PMSM闭环控制中的应用

分析了双极矩阵变换器（TSMC）在永磁同步电机（PMSM）闭环控制的基本原理,针对传统PI控制器对电机转速控制响应速度慢,控制精度低,以及电机调速、负载参数变化时,很难达到预期效果等问题,提出了一种利用模糊控制构建模糊自适应PI控制器,实现转速和电流闭环控制,该方法利用模糊推理能实现对PID参数的在线自整定,进一步完善PI控制器的性能,提高系统的控制精度。最后,在Matlab/Simulink软件上搭建了系统仿真平台,仿真结果验证了模糊自适应PI控制器能快速准确地跟踪转速的给定及具有良好的抗干扰性。     

基于模糊PI算法的电机调速策略

介绍了模糊PI算法在电机控制中的应用,构建了模糊PI调节器的控制规则,并在此基础上建立模糊PI控制器的电机调速系统数学模型。在Matlab下对系统进行仿真试验,在超调量、稳态静差,快速性及抗扰动性等方面与基本PI控制器进行了比较,获得仿真实验结果。     

直流伺服系统的模糊控制与仿真

以模糊控制为基础，提出了一种用于直流伺服系统的PI和参数在线自调整的复合模糊控制器。该控制器具有模糊控制的灵活性、适应性，同时又具有PI控制精度高的特点，可明显提高伺服系统的控制效果。利用MATLAB的SIMULINK和Fuzzy Toolbox实现了直流伺服模糊控制系统的计算机仿真。仿真实验表明，系统稳态精度高，动态响应速度快，超调量小，满足伺服系统的性能要求。     

新型感应加热电源调功方式的仿真

针对现存各种感应加热电源调功方式的不足,提出了模糊-PI复合控制的调功方法.该方法综合了模糊控制与PI调节的优点,确定了模糊控制器与PI调节器的最佳参数,给出了模糊-PI复合控制器仿真模型.仿真实验表明,模糊-PI控制器完全满足控制要求,控制效果良好,具有控制精度高,响应速度快的优点.     

永磁同步电动机新型模糊PI控制器的设计

为提高永磁同步电动机控制系统的抗扰性能,设计了一种新型的模糊PI控制器.该控制器包括模糊控制器和PI控制器,采用模糊开关选择器根据系统的状态实现不同控制器之间的切换,实现简单.将该新型控制器用于永磁同步电机控制系统中,仿真结果表明:与传统PI控制永磁同步电机伺服系统相比,永磁同步电机模糊PI控制系统鲁棒性强、响应快、对被控对象参数变化具有较好的适应能力.     

一种无刷直流电机模糊PI控制器设计

为克服传统的PI控制器参数整定方法在无刷直流电机控制中存在精度低、抗干扰能力弱等的不足,本文提出了一种基于PSO-GSA算法的模糊PI控制器设计方法。PSO-GSA算法融合了PSO算法的全局开发能力和GSA算法的局部探索性能,具有更加优异的最优值搜索能力。将PSO-GSA算法用于优化模糊PI控制器的量化因子和比例因子,实现了模糊控制对PI控制器的实时、高精度调节。仿真和实验表明,该方法可以使得无刷直流电机控制有较好的稳定性和鲁棒性,电机转速控制的精度有显著提高。     

基于变论域模糊PI四轮机器人的仿真与研究

针对四轮全向机器人运动过程中的稳定控制问题,以ARM嵌入式微处理器STM32F405为主控制器,提出了基于变论域模糊PI的稳定控制策略,实现了在线实时调整PI控制器的参数,提高了机器人整体的控制精度和鲁棒性。分别对常规PI算法和变论域模糊PI算法的机器人底盘电机进行仿真和实验。结果表明,基于变论域模糊PI控制的四轮机器人响应速度快、抗干扰能力强,能够更好的减小超调量,提高系统的动静态特性和鲁棒性。     

基于模糊PI控制的穿戴式上肢康复机器人

为了加速患有运动功能障碍的患者上肢伸展功能的康复,研制出基于模糊PI控制的穿戴式上肢康复机器人.该上肢机器人借助结合眼动跟踪仪的虚拟现实平台通过气动肌肉驱动实现上肢的康复训练,采用模糊PI控制器对机器人实施位置控制.实验通过受试者穿戴该上肢机器人完成各关节的轨迹跟踪来检测模糊PI控制的效果.实验结果证明:模糊PI控制响应速度较快,轨迹跟踪误差较小,实用性较好.     

永磁同步电动机模糊PI控制系统与仿真

本文将模糊PI控制器应用于永磁同步电动机控制系统,克服了基于矢量控制的永磁同步电动机的非线性,耦合性以及在运行过程中电动机参数发生突变的影响,达到较高的控制精度。通过仿真实验表明采用模糊PI控制比传统的PI控制器具有较高的稳态精度和强的鲁棒性。     

考虑铁损时异步电机模糊PI控制的调速研究

随着工业的发展,控制系统复杂程度的不断加大,参数随机多变,传统PI速度控制器已经不能满足系统对性能的要求,在传统PI速度控制器基础上,根据模糊控制理论,设计了模糊PI控制器,利用MATLAB/Simulink进行传统PI控制器和模糊PI控制器的仿真,对比仿真结果说明模糊PI控制器具有更加好的稳定性和鲁棒性.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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