共查询到19条相似文献，搜索用时 125 毫秒
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随着Internet的快速发展,网络控制系统的应用越来越广泛,由于受到数据包容量的限制,在网络控制系统中多包传输是不可避免的.作为系统分析和设计的基础,对网络控制系统建立合适的模型,意义尤显重要,在系统中,传感嚣采用时间驱动方式,控制器和执行器采用事件驱动方式.在考虑延时小于一个采样周期和大于一个采样周期的情况下,给出... 相似文献
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针对网络控制系统的数据丢包问题,提出将网络控制系统中的丢包问题等价地转换为k采样周期网络控制问题,进而通过变换将k采样周期的网络控制系统等价转化为变时延网络控制系统。在此基础上,将李雅普诺夫稳定性理论与线性矩阵不等式方法相结合,给出这种变时延网络控制系统的稳定性判据和控制器设计方法。最后通过仿真结果验证了文中方法的有效性。 相似文献
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对于网络时滞小于一个采样周期的网络控制系统,建立了系统的离散化模型,并在此基础上研究了基于观测嚣的故障检测问题．把不确定时滞对残差系统产生的影响描述为未知输入,将残差产生器设计归结为后置滤波器和观测器增益矩阵的求解,给出了网络控制系统巩故障检测的矩阵Ricatti方程方法,进一步通过算例进行MATLAB仿真研究,验证提出算法的有效性． 相似文献
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对固相振荡燃烧模型所研究的化学现象进行了非线性动力学分析,将线性反馈控制方法应用到化学反应模型中。通过数值仿真,系统的相图、状态历程图、全局分岔图均表明：不断的调整控制参数,该方法能将此系统控制到稳定的周期轨道。 相似文献
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针对一类T-S模糊模型描述的非线性网络控制系统在数据丢包与执行器故障情况下的稳定性问题进行研究。首先,针对数据传输时的丢包现象,采用满足伯努利随机分布的随机变量加以表示,并采用Markov过程表示执行器随机故障现象;其次,基于分段二次Lyapunov函数,给出一个H∞静态输出反馈控制器设计的充分条件;接着采用Finsler引理分离条件中的耦合项,基于线性矩阵不等式,给出闭环系统满足H∞性能随机稳定的充分条件;最后通过数值算例验证提出的可靠分段H∞控制器设计方法的有效性与可行性。 相似文献
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张小燕 《北京工业职业技术学院学报》2014,13(1):48-53
在功率测量中,由于非整周期采样、随机噪声、通道延时的存在,会降低测量准确度.针对这个问题,首先设计算法来减小这些因素的影响;然后在Labview平台上编写数据采集和数据处理程序;接着用信号发生器作为信号源和噪声源,NI ELVISⅡ作为数据采集设备采集电信号,并用所设计的采样整周期性算法、去除随机噪声算法、修正通道延时算法处理采集的数据,测量出源信号的有效电压值、有效电流值、平均功率、视在功率、无效功率和功率因数;最后进行数据分析和讨论.结果证明,所设计的功率测量算法能够减小上述3种因素对功率测量的影响,得到具有较高准确性的功率测量值. 相似文献
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一类新的混沌系统及其混沌控制 总被引：1，自引：0，他引：1
构造了一个新的三维自治混沌系统,该系统含有四个参数,三个非线性项.通过理论分析和相轨迹图、分岔图、Lyapunov指数谱等非线性动力学分析方法研究了系统的非线性动力学行为.最后运用线性反馈控制法对新混沌系统进行控制,将混沌轨道控制到稳定的周期轨道,并给出了数值仿真结果,证实了所设计的线性反馈控制器的有效性. 相似文献
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为了进一步提高分销系统的运作效率,针对带资源约束的多产品分销网络,研究了供应商管理库存（VMI）环境下的库存与补货问题。建立了各零售商处采用周期盘点库存控制策略时分销系统的利润模型,并设计了相应的求解算法。以一个数值算例验证了模型的有效性和实用性,结果表明：供应商及各零售商的利润对补货周期的反应是不灵敏的,同时,供应商可通过调整各零售商处的最高库存资金占用上限以使供应商与零售商的最优决策保持一致。 相似文献
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针对网络控制系统(NCS)存在时延的情况下如何设计控制器问题,提出了一种新的网络闭环控制系统建模方法-离散模糊T-S模型,并在此模型的基础上应用平行分布补偿原理设计了NCS模糊控制器;应用Lyapunov理论和LMI方法,研究了系统的模糊稳定控制问题,给出了基于线性矩阵不等式的不依赖时滞的状态反馈模糊控制器的设计方法,并获得了NCS模糊控制的稳定充分条件为求解一组线性矩阵不等式;通过仿真验证了该控制方法的有效性。 相似文献
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We investigate the best performance for linear feedback control systems in the case that plant uncertainty is to be considered. First, we define an average integral square criterion of tracking error over a class of stochastic model errors. By utilizing spectral factorization to minimize the performance index, we derive an optimal controller design method and further study best performance in the presence of stochastic perturbation. The results can be used to evaluate optimal performance in practical control system designs. 相似文献
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For linear switched system with both parameter uncertainties and time delay,a delay-dependent sufficient condition for the existence of a new robust H∞ feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm.Compared with the conventional state-feedback controller,the proposed controller can achieve better robust control performance since the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed synchronously with the dynamical characteristic of the system.This design method was also extended to the case where only delayed state is available for the controller.The example of balancing an inverted pendulum on a cart demonstrates the effectiveness and applicability of the proposed design methods. 相似文献
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We studied the response of harmonically and stochastically excited strongly nonlinear oscillators with delayed feedback bang-bang control using the stochastic averaging method. First, the time-delayed feedback bang-bang control force is expressed approximately in terms of the system state variables without time delay. Then the averaged It6 stochastic differential equations for the system are derived using the stochastic averaging method. Finally, the response of the system is obtained by solving the Fokker-Plank-Kolmogorov （FPK） equation associated with the averaged lt6 equations. A Duffing oscillator with time-delayed feedback bang-bang control under combined harmonic and white noise excitations is taken as an example to illus- trate the proposed method. The analytical results are confirmed by digital simulation. We found that the time delay in feedback bang-bang control will deteriorate the control effectiveness and cause bifurcation of stochastic jump of Duffing oscillator. 相似文献
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Path tracking control of autonomous agricultural mobile robots 总被引：3，自引：0，他引：3
ZHU Zhong-xiang CHEN Jun YOSHIDA Toyofumi TORISU Ryo SONG Zheng-he MAO En-rong 《浙江大学学报(A卷英文版)》2007,8(10):1596-1603
In a tractor automatic navigation system, path planning plays a significant role in improving operation efficiency. This study aims to create a suboptimal reference course for headland turning of a robot tractor and design a path-tracking controller to guide the robot tractor along the reference course. A time-minimum suboptimal control method was used to generate the reference turning course based on the mechanical parameters of the test tractor. A path-tracking controller consisting of both feedforward and feedback component elements was also proposed. The feedforward component was directly determined by the desired steering angle of the current navigation point on the reference course, whereas the feedback component was derived from the designed optimal controller. Computer simulation and field tests were performed to validate the path-tracking performance. Field test results indicated that the robot tractor followed the reference courses precisely on flat meadow, with average and standard lateral devia- tions being 0.031 m and 0.086 m, respectively. However, the tracking error increased while operating on sloping meadow due to the employed vehicle kinematic model. 相似文献
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A minimax optimal control strategy for quasi-Hamiltonian systems with bounded parametric and/or external disturbances is proposed based on the stochastic averaging method and stochastic differential game. To conduct the system energy control, the partially averaged Ito stochastic differential equations for the energy processes are first derived by using the stochastic averaging method for quasi-Hamiltonian systems. Combining the above equations with an appropriate performance index, the proposed strategy is searching for an optimal worst-case controller by solving a stochastic differential game problem. The worst-case disturbances and the optimal controls are obtained by solving a Hamilton-Jacobi-Isaacs （HJI） equation. Numerical results for a controlled and stochastically excited DulTlng oscillator with uncertain disturbances exhibit the efficacy of the proposed control strategy. 相似文献
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Xue-ping LI Wei-qiu ZHU Zu-guang YING 《浙江大学学报(A卷英文版)》2008,9(3):330-337
An optimization method for time-delayed feedback control of partially observable linear building structures subjected to seismic excitation is proposed. A time-delayed control problem of partially observable linear building structure under horizontal ground acceleration excitation is formulated and converted into that of completely observable linear structure by using separation principle. The time-delayed control forces are approximately expressed in terms of control forces without time delay. The control system is then governed by Itoe stochastic differential equations for the conditional means of system states and then transformed into those for the conditional means of modal energies by using the stochastic averaging method for quasi-Hamiltonian systems. The control law is assumed to be modal velocity feedback control with time delay and the unknown control gains are determined by the modal performance indices. A three-storey building structure is taken as example to illustrate the proposal method and the numerical results are confirmed by using Monte Carlo simulation. 相似文献
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研究具有反馈控制变量的时滞离散单种群模型的持久性问题,得到了一组新的保证该系统持久的充分性条件.所得结果实质性的改进了吴丽萍[具有反馈控制和时滞的＂食物有限＂离散种群模型的持久性]一文的主要结果. 相似文献
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状态反馈最优控制器设计及仿真 总被引：1，自引：0，他引：1
阐述了线性二次型状态反馈控制器的原理及设计方法,给出了最优状态观测器的存在条件,以及基于最优观测器的最优控制理论．以一级倒立摆为受控对象,通过Matlab仿真实验研究讨论了加权矩阵Q和R的变化对最优控制系统的影响问题,通过最优控制器与PID控制器控制效果进行比较,得出了最优控制器性能更好的结论． 相似文献