Passive fuzzy controller design for nonlinear systems with multiplicative noises     

Cheung-Chieh Ku  Wen-Jer Chang 《Journal of The Franklin Institute》2010,347(5):732-750

This paper proposes a passive fuzzy controller design methodology for nonlinear system with multiplicative noises. Applying the Itô's formula and the sense of mean square, the sufficient conditions are developed to analyze the stability and to design the controller for stochastic nonlinear systems which are represented by the Takagi-Sugeno (T-S) fuzzy models. The sufficient conditions derived in this paper belong to the Linear Matrix Inequality (LMI) forms which can be solved by the convex optimal programming algorithm. Besides, the passivity theory is applied to discuss the effect of external disturbance on system. Finally, some numerical simulation examples are provided to demonstrate the applications of the proposed fuzzy controller design technique.  相似文献   

超磁致伸缩作动器的磁路设计     

李小鹏  荣凯  许楠  刘伟  张中远  田库  苗胜 《天津工程师范学院学报》2011,21(1):19-21

论述了超磁致伸缩作动器的基本原理,根据三种偏置磁场优缺点,选用增加单独线圈产生偏置磁场。在磁路分析的基础上,采用有限元仿真的方法,分析了不同参数和结构对各个组成部分的磁场影响。  相似文献   

Remote access laboratories in Australia and Europe     

H. Ku  T. Ahfock  T. Yusaf 《European Journal of Engineering Education》2011,36(3):253-268

Remote access laboratories (RALs) were first developed in 1994 in Australia and Switzerland. The main purposes of developing them are to enable students to do their experiments at their own pace, time and locations and to enable students and teaching staff to get access to facilities beyond their institutions. Currently, most of the experiments carried out through RALs in Australia are heavily biased towards electrical, electronic and computer engineering disciplines. However, the experiments carried out through RALs in Europe had more variety, in addition to the traditional electrical, electronic and computer engineering disciplines, there were experiments in mechanical and mechatronic disciplines. It was found that RALs are now being developed aggressively in Australia and Europe and it can be argued that RALs will develop further and faster in the future with improving Internet technology. The rising costs of real experimental equipment will also speed up their development because by making the equipment remotely accessible, the cost can be shared by more universities or institutions and this will improve their cost-effectiveness. Their development would be particularly rapid in large countries with small populations such as Australia, Canada and Russia, because of the scale of economy. Reusability of software, interoperability in software implementation, computer supported collaborative learning and convergence with learning management systems are the required development of future RALs.  相似文献   

数字图书馆的社会模拟技术研究     

顾立平 《现代图书情报技术》2011,27(2):8-15

数字图书馆的非文献资源包括用户、用户产生的信息和用户行动,它们是社会网络、社会媒体与虚拟世界的元数据对象。在虚拟世界系统的基础上(含登记系统、地图系统、动态消息系统、快照系统和库存系统等),讨论数字图书馆能够以用户建模和信息系统模块来发展虚拟科研环境、虚拟校园和虚拟知识型社会等。  相似文献   

PDC and Non-PDC fuzzy control with relaxed stability conditions for contintuous-time multiplicative noised fuzzy systems     

Wen-Jer Chang  Cheung-Chieh Ku  Chia-Hao Chang 《Journal of The Franklin Institute》2012,349(8):2664-2686

This paper presents a relaxed scheme of fuzzy controller design for continuous-time nonlinear stochastic systems that are constructed by the Takagi–Sugeno (T–S) fuzzy models with multiplicative noises. Through Nonquadratic Lyapunov Functions (NQLF) and Non-Parallel Distributed Compensation (Non-PDC) control law, the less conservative Linear Matrix Inequality (LMI) stabilization conditions on solving fuzzy controllers are derived. Furthermore, in order to study the effects of stochastic behaviors on dynamic systems in real environments, the multiplicative noise term is introduced in the consequent part of fuzzy systems. For decreasing the conservatism of the conventional PDC-based fuzzy control, the NQLF stability synthesis approach is developed in this paper to obtain relaxed stability conditions for T–S fuzzy models with multiplicative noises. Finally, some simulation examples are provided to demonstrate the validity and applicability of the proposed fuzzy controller design approach.  相似文献   

基于STM32的塔式太阳能热发电定日镜双轴控制实验系统设计与实现     

冯涛  李擎  王常策  崔家瑞  潘月斗  库都斯 《实验室研究与探索》2021,(2):133-138

针对塔式太阳能热发电系统中定日镜的逐日跟踪问题,开发了一套用于定日镜双轴运动控制的实验系统。采用STM32F407为主控单片机,实现Modbus-TCP通信、EEPROM非易失性参数存储、正交编码信号计数,基于STM32内部灵活的计数器结构,以硬件的方式实现了脉冲信号的可控输出,减轻了CPU的工作负载,提高了系统稳定性、响应速度和跟踪精度。实际应用表明,该系统运行稳定,跟踪精度高,结构精简,具有较高的可靠性,达到了预期的设计目的。  相似文献   

When the child gets in the news? A case study on the national written media in Turkey     

Zafer Kuş  Kadir Karatekin  Durdane Öztürk  Özlem Elvan 《Educational Media International》2016,53(2):118-138

The main purpose of this study is to analyze news stories regarding children in the national print media in the last five years using top eight newspapers in terms of circulation and evaluate these news stories based on the Convention on the Rights of the Child, which was issued by the UN and signed by Turkey. The research was undertaken as a case study. The study data were collected from top eight newspapers in terms of circulation between 2010 and 2014 in order to reveal when and how newspapers at national level represent children and the scientific content of impressions in the national media. Results show that children appear in the national media in mostly negative cases. In conclusion, it was observed in this study, children’s rights to life, development, protection, and participation were violated at both national and international levels. In this sense, news reflects the truth about “children’s rights violations”. However, the way that children appear in news and reflection in media constitute a secondary children’s rights violation.  相似文献   

Digital communications systems : Hiroshi Inose. 342 pages,tables, illustr. University of Tokyo Press,Tokyo, 1979. second printing, 1981.     

Y.H. Ku 《Journal of The Franklin Institute》1982,314(4):263-264

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一个非线性两点边值问题的存在唯一性定理     

库连喜 《黄冈师范学院学报》1993,(2)

本文讨论非线性两点边值问题 x″=f(t,x,x′),x(0)=x(1)=0, 在f,f_x,f_(x')连续,f_x≥—β(t),0≤β(t)≤π~2,β(1/2)≠π~2,|f_(x')|≤α=const以及α与β(t)满足一定关系时,证明非线性边值问题有唯一解。  相似文献   

一类高阶微分方程零解稳定性的一个判据     

库连喜 《黄冈师范学院学报》1992,(1)

本文利用理论给出零解稳定性的一个方便的新判据。  相似文献