首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   131篇
  国内免费   4篇
  完全免费   85篇
  自动化技术   220篇
  2022年   2篇
  2021年   10篇
  2020年   20篇
  2019年   26篇
  2018年   20篇
  2017年   23篇
  2016年   13篇
  2015年   16篇
  2014年   17篇
  2013年   22篇
  2012年   11篇
  2011年   7篇
  2010年   9篇
  2009年   7篇
  2008年   3篇
  2007年   2篇
  2006年   4篇
  2005年   2篇
  2004年   3篇
  2000年   1篇
  1993年   1篇
  1990年   1篇
排序方式: 共有220条查询结果,搜索用时 187 毫秒
1.
基于神经网络干扰观测器的动态逆飞行控制   总被引:3,自引:0,他引:3  
对新一代歼击机提出了基于神经网络干扰观测器的动态逆飞行控制器设计方案.首先采用RBF神经网络设计干扰观测器,使其输出能够逼近动态逆误差;然后基于干扰观测器的输出设计动态逆飞行控制系统,该系统能克服动态逆误差对飞行控制带来的不利影响;最后将所设计的飞行控制系统用于新一代歼击机的机动飞行仿真,仿真结果表明该飞行控制系统是有效的.  相似文献
2.
采用改进型扰动观测器的控制方法   总被引:3,自引:0,他引:3       下载免费PDF全文
提出一种适用于非最小相位对象的改进型扰动观测(DOB)结构. 通过新增两个控制器, 该结构不但对标称性能控制器输出进行动态补偿, 而且还补偿了系统输出反馈信号. 因此, 基于新DOB的控制结构不但能在低频段很好的抑制外部干扰, 消除实际被控模型摄动对闭环系统的输出性能的影响, 更重要的是提高了抑制高频测量噪声的能力. 最后, 讨论了该控制结构的内部稳定性和鲁棒稳定性.  相似文献
3.
受扰线性离散系统的前馈-反馈最优控制   总被引:3,自引:0,他引:3  
研究具有已知动态特性但未知初始条件的持续外界扰动的线性离散系统最优控制问题。给出了前馈一反馈最优控制律的存在唯一性条件,并提出了最优控制律的设计算法.通过降维扰动观测器解决了前馈一反馈最优控制律的物理不可实现问题.对近海结构物振动控制的实例仿真表明,该设计算法易于实现,在抑制外部持续扰动和鲁棒性方面优于经典的状态反馈最优控制。  相似文献
4.
Ball mill grinding circuits are essentially multi-variable systems characterized with couplings, time-varying parameters and time delays. The control schemes in previous literatures, including detuned multi-loop PID control, model predictive control (MPC), robust control, adaptive control, and so on, demonstrate limited abilities in control ball mill grinding process in the presence of strong disturbances. The reason is that they do not handle the disturbances directly by controller design. To this end, a disturbance observer based multi-variable control (DOMC) scheme is developed to control a two-input-two-output ball mill grinding circuit. The systems considered here are with lumped disturbances which include external disturbances, such as the variations of ore hardness and feed particle size, and internal disturbances, such as model mismatches and coupling effects. The proposed control scheme consists of two compound controllers, one for the loop of product particle size and the other for the loop of circulating load. Each controller includes a PI feedback part and a feed-forward compensation part for the disturbances by using a disturbance observer (DOB). A rigorous analysis is also given to show the reason why the DOB can effectively suppress the disturbances. Performance of the proposed scheme is compared with those of the MPC and multi-loop PI schemes in the cases of model mismatches and strong external disturbances, respectively. The simulation results demonstrate that the proposed method has a better disturbance rejection property than those of the MPC and PI methods in controlling ball mill grinding circuits.  相似文献
5.
Small-scale helicopters are very attractive for a wide range of civilian and military applications due to their unique features. However, the autonomous flight for small helicopters is quite challenging because they are naturally unstable, have strong nonlinearities and couplings, and are very susceptible to wind and small structural variations.A nonlinear optimal control scheme is proposed to address these issues. It consists of a nonlinear model predictive controller (MPC) and a nonlinear disturbance observer. First, an analytical solution of the MPC is developed based on the nominal model under the assumption that all disturbances are measurable. Then, a nonlinear disturbance observer is designed to estimate the influence of the external force/torque introduced by wind turbulences, unmodelled dynamics and variations of the helicopter dynamics. The global asymptotic stability of the composite controller has been established through stability analysis. Flight tests including hovering under wind gust and performing very challenging pirouette have been carried out to demonstrate the performance of the proposed control scheme.  相似文献
6.
基于模糊干扰观测器的自适应二阶动态滑模控制   总被引:2,自引:0,他引:2       下载免费PDF全文
针对一类存在不确定性和外干扰的非线性系统滑模控制的抖振问题,本文首先证明了以高斯函数为隶属度函数的模糊基向量对状态向量的偏导在任意情况下有界,解决了模糊辨识同二阶动态滑模结合的关键问题.然后设计了二阶动态Terminal滑模,有效克服了滑模抖振,且能保证滑模面上的滑动在有限时间内收敛.再基于模糊干扰观测器的输出设计自适应鲁棒补偿项.基于李雅普诺夫理论证明了系统稳定性.最后将本文提出的控制方案用于近空间飞行器姿态角跟踪仿真,并分析了高阶动态滑模收敛时间增加的问题.结果表明本文提出的控制方案跟踪速度快、精度高,且有效去除了抖振.与常规Terminal滑模相比,二阶动态Terminal滑模增加的收敛时间非常有限,适于工程应用.  相似文献
7.
基于扰动观测器和有限时间控制的永磁同步电机调速系统   总被引:2,自引:0,他引:2  
针对采用矢量控制的永磁同步电机调速系统提出一种复合控制方法:首先用扰动观测器观测出系统中由于模型参数变化,负载改变等产生的扰动,并用此观测值作为前馈量补偿到输入端;然后运用有限时间控制方法设计系统前向通道中的反馈控制器;最后给出了控制器参数与速度误差收敛性能之间的数学关系.仿真表明,基于扰动观测器的有限时间控制具有更好的抗扰动性能和更优越的收敛性能.  相似文献
8.
朱亮  姜长生  方炜 《信息与控制》2006,35(6):705-710
针对一类不确定非线性系统,基于轨迹线性化控制方法(TLC)及非线性干扰观测器技术(NDO)研究了一种新的非线性鲁棒控制策略.TLC是一种有效的非线性跟踪和解耦控制方法,但当系统中存在内部未建模动态和外界干扰时,当前TLC控制器性能将显著下降.本文利用NDO对系统中的不确定项进行估计,其输出与TLC控制律结合来对消不确定性的影响.最后通过一个数值仿真实例验证了本文提出的方法的有效性,仿真结果表明该鲁棒轨迹线性化控制方法具有很好的干扰衰减能力和鲁棒性能.  相似文献
9.
Jung-Hoon  Myung-Joong 《Automatica》2004,40(12):2069-2074
A new improved robust variable structure controller is presented to provide an accurately prescribed tracking performance for brushless direct drive (BLDD) servo motors (SM) under uncertainties and load variations. A special integral sliding surface suggested for removing the reaching phase problems can define its ideal sliding mode and virtual ideal sliding trajectory from an initial position of SM. The tracking error caused by the nonzero value of the sliding surface is derived. A corresponding continuous control input with the disturbance observer is suggested to track a predetermined virtual ideal sliding trajectory within a prescribed value under all the uncertainties and load variations. The usefulness of the proposed algorithm is demonstrated through the comparative simulations for a BLDD SM under load variations.  相似文献
10.
A nonlinear predictive controller (NPC) for a permanent magnet synchronous motor (PMSM) is proposed in this paper. Its objective is high performance tracking of the rotor speed trajectory while maintaining the d-axis component of the armature current at zero. The load torque and the mismatched parameters are considered to be unknown perturbations. To ensure robustness against these perturbations, a disturbance observer is designed using a new gain function, and integrated into the control law. The combination of the nonlinear predictive controller and the disturbance observer works as a nonlinear controller. The overall closed-loop system is proved to be globally asymptotically stable depending on the design parameters. The validity of the proposed controller was tested by simulations. Satisfactory results were obtained with respect to the tracking of the speed trajectory and disturbance rejection.  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号