共查询到19条相似文献,搜索用时 62 毫秒
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本文采用数学分析的方法,以开放系统为研究对象,分析系统的衰变性,通过对有机物降解过程的分析,推导有机物降解的状态模型,得出的结论是,在一定边界条件下,开放系统的内在状态具有级数收敛衡定的性质,可以构建一种表达系统内在状态的模式。这种用模型形式来表达开放系统状态的方法,把复杂的非线性问题简化为相对简单的线性问题,形成了开展系统科学研究的新思路。 相似文献
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容错控制是使设计的控制系统能对可能发生的故障具有一定的容错能力,该问题直接关系到控制系统运行的可靠性和安全性。该文基于Lyapunov稳定性理论和Riccati方程,针对线性离散一步时滞系统,引入一步时滞状态反馈,研究了传感器失效后有一定性能保证的D稳定容错控制问题,在给出对传感器失效具有完整性的D稳定容错控制系统需满足的一个充分条件的基础上,进而给出控制器的设计方法和步骤,并推广至执行器失效情况,仿真实验验证了该方法的有效性,与引入状态反馈控制律相比,此方法有更好的动态平稳性。 相似文献
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考虑一类广义时滞系统的状态反馈H∞控制问题,目的是设计状态反馈控制律,使得闭环系统渐近稳定,且满足一定的H∞性能指标,控制律的设计只需求解一组LMI。数值算例说明了所给方法的有效性。 相似文献
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执行器失效不确定时滞系统的指定衰减度鲁棒可靠控制 总被引:8,自引:0,他引:8
针对一类含有时变时滞的不确定参数线性系统,研究了在执行器发生故障情况下的鲁棒可靠控制器设计问题.系统中的参数不确定性满足广义匹配条件,时变时滞的大小及其变化率有界,并假设故障执行器元件的输出为零.经过适当的模型变换,将原系统的鲁棒指数镇定问题转化为另一个等价系统的鲁棒镇定问题.根据Lyapunov稳定性理论和线性矩阵不等式(LMI)方法,分别给出了鲁棒可靠控制器存在的时滞无关和时滞相关充分条件.仿真结果表明了该控制器设计方法的有效性. 相似文献
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系统控制单元的有限存储空间被系统运行数据写满时,新产生的数据就需替换旧数据完成更新。通过采用逐条替换法、分块替换法、间歇删除法和抢断删除法,比较替换过程中最少存储数据的数量和实时性的滞后时间,找出一种最优的数据更新方法。试验结果表明,抢断删除替换算法更能快速有效实时完成数据的更新。 相似文献
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The state equation is a verification technique that has been applied—not always under this name—to numerous systems modelled as Petri nets or communicating automata. Given a safety property P, the state equation is used to derive a necessary condition for P to hold which can be mechanically checked. The necessary conditions derived from the state equation are known to be of little use for systems communicating by means of shared variables, in the sense that many of these systems satisfy the property but not the conditions. In this paper, we use traps, a well-known notion of net theory, to obtain stronger conditions that can still be efficiently checked. We show that the new conditions significantly extend the range of verifiable systems. 相似文献
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通过适当调整状态反馈预测控制系统的设计参数—预测时域、控制作用衰减系数及状态反馈加权系数 ,使系统具有较好的控制性能和鲁棒性 ,在线调整设计参数方便灵活 ,实际工程应用范围增强 ,并给出了稳定塔蒸气压力控制的应用实例。 相似文献
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非线性PID控制在液位控制系统中的应用 总被引:1,自引:0,他引:1
针对液位控制系统的大时滞、不稳定性,常规PID控制很难满足要求,提出带有死区的非线性PID控制,实际运行验证了该方法的有效性. 相似文献
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In this paper, a new iterative learning control based on the double differential of the error is proposed for the linear time varying system having relative degree greater than one. The convergence criterion of the proposed method is proved. Furthermore, it is shown by simulations that convergence of error can be increased considerably by using our proposed controller as compared to the iterative learning controller using error or single differential of the error for the modification of the control input without increasing the learning gain. 相似文献
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Iterative Learning Control Utilizing the Error Prediction Method 总被引:1,自引:0,他引:1
Muhammad Arif Tadashi Ishihara Hikaru Inooka 《Journal of Intelligent and Robotic Systems》1999,25(2):95-108
In this paper, iterative learning control utilizing the error prediction method is proposed for a class of linear time varying systems subjected to disturbances. Prediction of the error is done by identifying the system time varying parameters. Convergence of the proposed method is analyzed and the uniform boundedness of tracking error is obtained in the presence of uncertainty and disturbances. It is shown that the learning algorithm not only guarantees the robustness, but also improves the learning rate despite the presence of disturbances. The effectiveness of the proposed method is presented by simulations. 相似文献
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在线性系统滑模控制理论的基础上,给出了对于一般SLSO线性系统状态范数控制的形式,提出了状态范数的控制器结构。基于李亚普诺夫稳定性理论证明了状态范数控制系统的闭环稳定性。然后分别针对状态范数控制器与趋近率控制和单位向量控制进行了数值仿真的分析与比较,结果说明状态范数控制综合了趋近率控制和单位向量控制各自的优点,控制信号抖振更小,闭环系统稳态性能有了一定改进。 相似文献
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Francesco Amato Carlo Cosentino Gianmaria De Tommasi Alfredo Pironti 《Asian journal of control》2016,18(3):828-841
In this paper we deal with the mixed /finite‐time stability control problem. More specifically, given an open loop uncertain linear system, we provide a necessary and sufficient condition for quadratic input‐output finite‐time stability with an bound. Exploiting this result we also give a sufficient condition to solve the related synthesis problem via state‐feedback. The property of quadratic input‐output finite‐time stability with an bound implies that the system under consideration satisfies an performance bound between the disturbance input and the controlled output and, at the same time, is input‐output finite‐time stable for all admissible uncertainties. This condition requires the solution of a feasibility problem constrained by a pair of differential linear matrix inequalities (LMIs) coupled with a time‐varying LMI. The proposed technique is illustrated by means of both a numerical and a physical example. 相似文献