共查询到20条相似文献，搜索用时 312 毫秒
1.
基于MATLAB的状态观测器设计方法 总被引：1，自引：0，他引：1
文章通过实例介绍了一种用MATLAB设计状态观测器的方法,并且用SIMULINK对设计的状态观测器进行数字仿真,仿真结果表明所设计的状态观测器能很好地对状态进行估计. 相似文献
2.
一类非线性系统降维观测器的设计 总被引：1，自引：0，他引：1
詹春 《江西教育学院学报》2001,22(3):16-19
与线性系统一样，非线性系统状态观测器，按其结构可分为全维观测器和降维观测器。基于对Riccati方程的求解，本文对具有主线性部分，非线性部分满足Lipschitz条件的非线性系统给出了一降维观测器的设计方法，并讨论了该方法的适用性。 相似文献
3.
郑宏 《辽宁科技学院学报》2011,13(2):18-19
研究一类非线性切换系统的观测器的设计问题。系统的不确定性满足范数有界,利用共同Lyapunov函数方法,给出了增广系统渐近稳定的充分条件,得到了系统的观测器。 相似文献
4.
远巧针 《三门峡职业技术学院学报》2005,4(2):68-70
研究一类非线性时变系统的状态观测器设计问题,引入非线性时变系统的时变相对阶,通过坐标变换将系统输入输出线性化,对于满足相对阶为r(相似文献
5.
针对具有从传感器到执行器和执行器到控制器两段时延不确定的连续网络化Markov跳变系统,研究基于事件触发机制的观测器与控制器的协同设计问题.首先,考虑到系统状态不可测的情况,在控制器端构造观测器,通过对事件触发机制下信号传输时序的分析,将闭环系统建模为等价的时滞系统;其次,利用李雅普诺夫泛函稳定性定理和线性矩阵不等式方法,得到闭环系统稳定的充分条件;最后,给出控制器和观测器增益矩阵的求解方法,实现控制器和观测器的协同设计,并用数值仿真验证该设计方法的有效性. 相似文献
6.
刘轩黄 《江西电力职业技术学院学报》2002,15(1):1-5
放弃Luenberger状态观测器理论对系统完全可观测性的要求 ,提出了一般离散线性时变系统的状态观测器的设计方法。对j =i,i- 1,给出了系统完全 (i,j,Ti)可重构的新概念 ,且给出了可重构的充要条件 相似文献
7.
齐春燕 《内江师范学院学报》2006,21(2):44-47
利用动态补偿器来设计离散时间奇异系统的观测器.其方法是在被研究系统分解成EF 1形式后,对前循环系统和后循环系统分别作以输出反馈补偿器为基础的动态观测器. 相似文献
8.
交流感应电机是多变量、非线性、强耦合的高阶系统，所有这些控制方案的实现，几乎都需要转子磁链信息。基于此提出了一种基于扩展Kalman滤波器理论的磁链观测器的设计方法，并对所设计的观测器进行了计算机仿真，得到了良好的观测效果。 相似文献
9.
针对输入更新不等间隔的非一致采样系统,提出一种基于状态观测器的状态反馈预测控制算法．通过提升控制信号,设计了输入输出同周期的非一致采样系统的状态观测器,并且给出了提升控制信号前后观测器系数矩阵的关系．运用线性矩阵不等式方法,解决无穷时域二次型性能指标下的优化问题,给出了状态反馈预测控制器存在的充分条件．仿真结果证明了控制算法的有效性． 相似文献
10.
《兰州石化职业技术学院学报》2018,(4)
研究了一类具有执行器时变故障的非均匀传输非线性NCS广义观测器的设计方法。考虑状态并非完全可测,基于T-S模糊模型,建立非线性增广误差系统,借助Lyapunov稳定性理论,证明增广误差系统的稳定性,推证出使其具有鲁棒性能的广义观测器的设计方法。最后,以四容水箱为算例验证了结果的合理性与有效性。 相似文献
11.
Giant magnetostrictive actuators （GMAs） often work in a close-loop feedback system. This system needs independent sensors which may be difficult to be fixed, besides, excessive sensors may cause more unpredicted problems in a large system. This paper aims to develop a self-sensing GMA. An observer based on piezomagnetic equations is constructed to estimate the stress and strain of the magnetostrictive material. The observer based self-sensing approach depends on the facts that the magnetic field is controllable and that the magnetic induction is measurable. Aiming at the nonlinear hysteresis in magnetization, a hysteresis compensation observer based on Preisach model is developed. Experiment verified the availability of the observer approach, and the hysteresis compensation observer has higher tracking precision than linear observer for dynamic force sensing. 相似文献
12.
In recent years, fault detection and isolation(FDI) technologies have been developing rapidly.Among them the observer-based fault detection andisolation technology for nonlinear systems are the mostattractive research areas, and lots of promising resultscan be found in survey papers[1]. Generally, thereare several kinds of strategies for observer-based FDIin nonlinearsystems such as unknown inputs observer-based FDI[2], and adaptive observer-based FDI[3]. Insome cases, fault accommodation… 相似文献
13.
An approach of position sensorless control for permanent magnet synchronous motor （ PMSM ） is put forward based on a sliding mode observer. The mathematical model of PMSM in a stationary αβ reference frame is adopted, and the system is controlled by the digital signal processor （ DSP; TMS320LF2407 according to the control achieve closed loop operation of the motor, the stator theory of sliding mode observer. In order to magnetic field should be vertical with the rotor magnetic field and be synchronous with rotor rotating, so the position and speed of PMSM is estimated in real time and the estimated position is modified continuously. The simulation results indicate that the proposed observer has high precision is more robust to the parametric variation and load in estimation of PMSM position and speed, and torque disturbance. 相似文献
14.
WHOSE DEVELOPMENT? SALVAGING THE CONCEPT OF DEVELOPMENT WITHIN A SOCIOCULTURAL APPROACH TO EDUCATION
A bstract . The concept of development is currently under revision in education and psychology. In this essay, Eugene Matusov, Renée DePalma, and Stephanie Drye examine a traditional notion of development and provide an alternative sociocultural view. As educators working within a sociocultural approach to learning, development, and education, the authors see psychological phenomena as rooted in participation in sociocultural activities, practices, and communities. They critique how the traditional notion of development essentializes this process, assuming development to be independent of the observer. Using a case where a child of color develops a "sitting disability" within the institutional context of schooling, they illustrate the need for introducing a sociocultural notion of development, arguing that development is a social construction emerging in communities of practice and that it is necessary to consider the role of the observer in both defining and guiding this process in a professional discourse of cases. 相似文献
15.
1 Introduction Owing to the increasing demand for high reliabilityin manyindustrial processes , much attention has beenpaid to the problem of fault detection and diagnosis(FDD) in dynamic systems over the past two decades .Fruitful results can be found in a survey paper[1]andbooks[2 ,3]. It is well known that faults in a dynamic systemcantake many forms .They can be actuator faults ,sensorfaults ,unexpected abrupt changes of some parametersor even unexpected structure changes[4 ,5]. The pur-… 相似文献
16.
邱浩 《深圳职业技术学院学报》2007,6(4):12-16
针对控制系统故障诊断中存在的不可测干扰，利用一种基于广义逆的未知输入观测器进行故障诊断，并将此方法用于汽车发动机电控系统执行器的故障检测问题。该观测器对控制系统的状态进行重构，通过判断由系统的真实输出和其估计值之间的残差是否超过阈值来检测故障。仿真结果表明，该方法原理简单，对汽车发动机电控系统执行器故障的诊断准确有效。 相似文献
17.
感应电动机是一个多变量、强耦合、非线性的控制对象,性能优良的非线性磁链观测器成了电机控制中一个非常重要的研究内容。文章基于模型参考自适应系统理论设计了转子磁链观测器的数学模型,并对所设计的模型进行了仿真分析,仿真结果验证了理论的正确性。 相似文献
18.
A passive control strategy with nonlinear observer is proposed, which can be used to control a class of chaotic dynamical systems to stabilize at different equilibrium points. If the nonlinear function of chaotic system satisfies Lipschitz condition, the nonlinear observer can observe the state variables of the chaotic systems. An important property of passive system is studied to control chaotic systems, that is passive system can be asymptotically stabilized by state feedback controller whose state variables are presented by nonlinear observer. Simulation results indicated that the proposed chaos control method is very effective in a class of chaotic systems. 相似文献
19.
自然之美的旁观者——论艾米莉·狄金森自然诗歌之生态意识 总被引：1，自引：0，他引：1
生态美学是生态学与美学的一种有机的结合,是运用生态学的理论和方法研究美学,将生态学的重要观点吸收到美学之中,从而形成一种崭新的美学研究视角。狄金森的自然诗歌具有强烈的生态意识,她以旁观者的身份描写自然,与自然和谐共存而又逃离自然,展示了其作为自然旁观者的审美思想。 相似文献
20.
Reflecting on the think-aloud method for evaluating e-learning 总被引：1，自引：0，他引：1
Deborah Cotton Karen Gresty 《British journal of educational technology : journal of the Council for Educational Technology》2006,37(1):45-54
E‐learning is increasingly being used in higher education settings, yet research examining how students use e‐resources is frequently limited. Some previous studies have used the think‐aloud method (an approach with origins in cognitive psychology) as an alternative to the more usual questionnaire or focus groups, but there is little discussion in the educational literature about the advantages and disadvantages of this approach. In this paper, we discuss our experience of using the think‐aloud method in a recent study, and we reflect on its potential contribution as a research method. A number of concerns about the method arose during our study, including the level of guidance given to participants, observer influence, and the complexity of data analysis. We conclude, however, that the richness of the data collected outweighs these constraints, and that the think‐aloud method has the potential to enhance research in this field. 相似文献