排序方式： 共有67条查询结果，搜索用时 62 毫秒
1.
在本文中,针对具有非线性干扰的切换系统,设计观测器,并且Gronwall引理的运用,使得闭环系统是渐近稳定的. 相似文献
2.
提出了新型的基于线性扩张状态观测器的感应电动机转子磁链估计模型。以两个独立的线性扩张状态观测器观测定子电流,用分别被扩张的两个状态构建闭环转子磁链观测器,根据Lyapunov稳定性理论推导满足转子磁链观测器渐进稳定的反馈增益矩阵和转速估计自适应律。利用Matlab进行了仿真,分析了电机参数变化对磁链观测和转速估计精度的影响,表明了提出的模型对电机参数变化具有强鲁棒性。 相似文献
3.
针对船舶路径跟踪控制中的舵角需优化﹑舵幅和舵速受约束等问题,提出模型预测控制(model predictive control,MPC)算法。为处理系统高阶状态值不易测量以及环境干扰问题,设计高阶非线性观测器,同时对船速和包含模型不确定项和外界干扰的总未知项进行估计。以引入舵机响应系统的MMG模型作为预测模型,不仅能提高预测精度,而且更符合船舶运动控制的实际情况。仿真结果表明,所设计的控制器在风浪流时变干扰下仍能跟踪参考路径,舵角幅值小且其变化是光滑的,速度值和总未知项也均能被准确地逼近,验证了所提算法的有效性。 相似文献
4.
In this paper, an observer-based sliding mode control (SMC) problem is investigated for a class of uncertain delta operator systems with nonlinear exogenous disturbance. A novel robust stability condition is obtained for a sliding mode dynamics by using Lyapunov theory in delta domain. Based on a designed sliding mode observer, a sliding mode controller is synthesized by employing SMC theory combined with reaching law technique. The robust asymptotical stability problem is also discussed for the closed-loop system composed of the observer dynamics and the state estimation error dynamics. Furthermore, the reachability of sliding surfaces is also investigated in state-estimate space and estimation error space, respectively. Finally, a numerical example is given to illustrate the feasibility and effectiveness of the developed method. 相似文献
5.
对一类带有未知输入干扰的离散描述系统,提出了一种新型的干扰解耦状态观测器;对一类带有未知输入干扰和有界不确定性的离散描述系统,以状态观测器为基础,利用故障信号与观测误差之间的关系,构造了一种带有未知输入干扰的离散描述系统的鲁棒故障诊断方法.该方法不但能够检测系统中是否出现故障,而且还可以估计出故障的幅值大小.文中还讨论了阈值的选取、该算法能检测到的最小故障信号和故障信号的估计误差,其仿真结果表明了该方法的有效性. 相似文献
6.
In this paper, the actuator fault diagnosis problem for a class of bilinear systems with uncertainty is discussed. The system is transformed into two different subsystems. One is not affected by actuator fault, so an adaptive observer can be designed such that, under certain conditions, the observer error dynamics is stable. The other whose states can be measured is affected by the faults. The observation scheme is then used for model-based fault diagnosis. Finally, an example of a semiactive suspension system is used to illustrate the applicability of the proposed method. 相似文献
7.
Ana Cristina Torres Amélia Lopes Jorge M. S. Valente Ana Mouraz 《Teaching in Higher Education》2017,22(7):822-838
Peer Observation of Teaching has raised a lot of interest as a device for quality enhancement of teaching. While much research has focused on its models, implementation schemes and feedback to the observed, little attention has been paid to what the observer actually sees and can learn from the observation. A multidisciplinary peer observation of teaching program is described, and its data is used to identify the pedagogical aspects to which lecturers pay more attention to when observing classes. The discussion addresses the valuable learning opportunities for observers provided by this program, as well as its usefulness in disseminating, sharing and clarifying quality teaching practices. The need for further research concerning teacher-student relationships and students’ engagement is also suggested. 相似文献
8.
CoAP是M2M的核心技术之一,其观察者模式是一种软件设计模式。IETF RFC 7641定义的CoAP资源观察机制正是基于该模式,是CoAP教学和实验内容的重要组成部分。将CoAP中资源观察消息的传递过程与通知的传输控制、时效性模型结合进行课程教学内容设计,通过Eclipse开源项目Californium中提供的API设计相应实验,并利用JUnit框架设计CoAP资源观察的测试用例,测试结果验证了相应资源观察过程。将该设计运用到实际教学活动中,学生对CoAP的内涵理解及编程能力都有提高。 相似文献
9.
10.
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