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一类网络控制系统的H2方法 总被引:1,自引:0,他引:1
由于网络传输带宽的限制, 在网络传输中可能造成数据的丢失. 对于同时具有测量数据和控制数据丢失的一类网络控制系统, 研究 H2 输出反馈控制问题. 数据的丢失采用满足 Bernoulli 分布的二进制随机变量进行表述. 利用矩阵不等式方法给出了 H2 动态输出反馈控制器存在的充分条件, 所设计的控制器使得闭环系统是均方意义下指数稳定并具有给定的 H2 性能. 采用 SLPMM (Sequentially linear programming matrix method) 给出相应的控制器求解算法. 最后用数值仿真验证了所提出算法的可行性. 相似文献
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孟介民 《计算技术与自动化》2023,(2):71-74
为了避免智能路灯控制系统受缺失数据影响,研究了智能路灯控制系统缺失数据流关联修复仿真方法。选取嵌套窗口的流数据处理模型检测智能路灯控制系统的缺失数据流,嵌套窗口的流数据处理模型将滑动窗口分割为多个嵌套滑动窗口,滑动窗口过程中,利用Pearson相关系数确定智能路灯控制系统中相邻数据的相关性,依据获取的数据相关性重构相关图,利用相关图检测智能路灯控制系统缺失数据流。选取GMM算法划分存在缺失数据的智能路灯控制系统的数据集,选取EM插补算法关联修复完成初始数据集划分后的数据流。仿真测试结果表明,该方法可以有效修复智能路灯控制系统缺失数据流,不同数据缺失率情况下,均具有较高的缺失数据流关联修复精度。 相似文献
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《IEEE transactions on systems, man, and cybernetics. Part A, Systems and humans : a publication of the IEEE Systems, Man, and Cybernetics Society》2005,35(5):746-753
In this paper, we are concerned with a new control problem for uncertain discrete-time stochastic systems with missing measurements. The parameter uncertainties are allowed to be norm-bounded and enter into the state matrix. The system measurements may be unavailable (i.e., missing data) at any sample time, and the probability of the occurrence of missing data is assumed to be known. The purpose of this problem is to design an output feedback controller such that, for all admissible parameter uncertainties and all possible incomplete observations, the system state of the closed-loop system is mean square bounded, and the steady-state variance of each state is not more than the individual prescribed upper bound. We show that the addressed problem can be solved by means of algebraic matrix inequalities. The explicit expression of the desired robust controllers is derived in terms of some free parameters, which may be exploited to achieve further performance requirements. An illustrative numerical example is provided to demonstrate the usefulness and flexibility of the proposed design approach. 相似文献
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The aim of this paper is to control an electromagnetic wave that penetrates in a medium with some missing information about its physical properties. The missing value of wave velocity of propagation leads us to use averaged control notion which is recently introduced by E. Zuazua, also the boundary Dirichlet condition is unknown which requires using the notion of no-regret control introduced by J. L. Lions. In this work, we combine these two techniques where we introduce the notion of averaged no-regret control to solve our optimal control problem with missing data. The averaged no-regret control will be characterised by an optimality system. 相似文献
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针对园区照明系统能耗数据缺失、区域能耗难以控制的问题,助力企业节能、减排,提出了一种基于决策树算法的园区照明系统能耗优化控制方法。预处理园区照明系统能耗数据,通过属性选择统一能耗数据属性值,采用基于马氏距离的k均值填充法填补能耗数据缺失值;选取C4.5决策树搭建园区照明系统能耗回归预测模型,预测获取园区照明系统总能耗,构建园区照明系统能耗控制目标函数,衡量照度及照明设备亮度二者跟随时间推移产生的规律,以此判断园区照明系统设备的下一时刻亮度,实现对园区照明系统的能耗优化控制。实验结果表明,所提方法可有效填补缺失能耗数据,并精准预测园区照明系统能耗值,预测精度高达99.16%;优化控制后的年度耗电量相比上一年度缩减两倍,优化控制效果优秀。 相似文献
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万世昌 《计算机测量与控制》2019,27(12):75-78
针对传统雷达控制系统鲁棒性较差、控制效率较低的问题,基于HDFS跟踪技术研究了一种新的雷达控制系统鲁棒性增强技术。收集雷达控制系统数据,利用信息流控制语言代数形式对收集的数据进行解析处理,选择最适合进行研究的数据,并对雷达控制系统进行伺服控制,利用SQL方法,在数据传输过程中对数据进行注入操作,进而降低数据在传导中的损失率。在此基础上,在HDFS跟踪状况下完成雷达控制系统鲁棒性增强操作,多种方法并行,有效解决了雷达控制系统鲁棒性差的问题。为检测增强效果,设定对比实验,结果表明,基于HDFS跟踪的雷达控制系统鲁棒性增强技术的系统鲁棒性较强,控制效率提高了21.42%。 相似文献
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The problem of robust sampled-data control for uncertain dynamic systems in the presence of missing data has been investigated. By using stochastic variables with a Bernoulli distributed white sequence to model missing data, along with time-varying norm-bounded uncertainties, and the input delay approach for sampled-data systems, two models for the considered sampled-data control system are proposed as the consecutive missing data scenario. Moreover, when data are missing, the control signals are held as the last received data. Sufficient conditions for the existence of desired robust sampled-data controllers are presented in the form of a linear matrix inequality. A numerical example is given to illustrate the validity of the proposed methods and to compare the results between the two proposed models of the sampled-data control system. 相似文献
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针对传统误差控制方法存在耗时较长、误报率较高以及误差控制精度较低等问题,提出了一种基于贝叶斯统计的测量系统误差控制方法。通过含有区间灰数的模糊子集所处的故障状态,得到测量系统产生误差的条件,利用贝叶斯网络推理算法以及相关的区间运算规则,对规划模型求解,获取测量系统产生误差的概率以及相关部件的重要特征信息。根据求解结果以及相关的空间交汇原理构建待测点坐标、待测距离以及有关于经纬仪观测角的数据模型,通过分析测量系统产生误差的原因,选取满足误差存在条件的数据对网络进行训练,令其逼近非线性函数,完成对测量系统误差的有效控制。实验结果表明,所提方法能够快速、准确地对测量系统产生的误差进行控制。 相似文献
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《自动化学报》2005,(3)
The data packet dropouts phenomenon is usually inevitable when information transmit- ted among communication networks.In this paper,the robust stabilization problem for uncertain networked control systems with data packet dropouts is studied.First,an uncertain discrete-time switching system model is presented to describe these networked control systems.The stability equiv- alence is then proved between this switching system and an uncertain impulsive difference system. Moreover,a sufficient condition is obtained for the asymptotical stability of the nonlinear impulsive difference system.From this condition the robust stabilization problem is dealt with for the uncertain impulsive system.Main results are given in linear matrix inequalities.Finally a numerical example is given to illustrate the theoretical results. 相似文献
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殷春武 《计算机工程与应用》2019,55(3):266-270
对存在执行器故障的连续线性时变系统,给出了PID型迭代学习容错控制律的收敛条件。对连续时变故障系统设计了一种PID迭代学习容错控制律,在[λ]范数意义下给出了故障系统PID型迭代容错控制器收敛的充要条件;基于Schur补原理和不等式变换,将容错控制器收敛条件转换成线性矩阵不等式,当迭代学习收敛速度设定时,基于线性矩阵不等式能快速确定最优迭代控制增益,避免了迭代控制增益设置的盲目性。旋转控制系统的数值仿真,验证了PID迭代容错控制器优良的容错性能和跟踪性能。 相似文献
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基于降维观测器的网络控制系统的容错控制 总被引:3,自引:3,他引:0
针对被控对象是线性定常系统的网络控制系统,设传感器与控制器均为时间驱动,未能成功传输数据的传感器节点视为暂时失效,将网络控制系统建模为一类具有时变传感器"故障"的系统。此类系统相当于一个有限子系统的切换系统。借助容错控制和切换系统理论,利用Luenberger降维观测器估计系统状态,采用李亚普诺夫理论和线性矩阵不等式描述方法,给出了闭环系统渐近稳定的充分条件和控制器的设计方法。通过Matlab数值仿真算例,证明了分析方法和结果的有效性。 相似文献
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The data packet dropouts phenomenon is usually inevitable when information transmitted among communication networks. In this paper, the robust stabilization problem for uncertain networked control systems with data packet dropouts is studied. First, an uncertain discrete-time switching system model is presented to describe these networked control systems. The stability equivalence is then proved between this switching system and an uncertain impulsive difference system. Moreover, a sufficient condition is obtained for the asymptotical stability of the nonlinear impulsive difference system. From this condition the robust stabilization problem is dealt with for the uncertain impulsive system. Main results are given in linear matrix inequalities. Finally a numerical example is given to illustrate the theoretical results. 相似文献
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在网络控制系统中,控制指令或状态信息经常因为传输延时或故障而不能及时到达目的地。该文尝试在受控方增加一个基于BP算法的学习一预测环节,对缺失的控制指令进行精确预测,并用于系统控制,提高了系统的鲁棒性。针对普通BP算法训练速度慢的缺点,引入了趋势矫正系数,有效地提高了预测速度和精度。 相似文献
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发汗冷却系统的最优控制 总被引:3,自引:1,他引:2
讨论发汗冷却系统的成控制问题。选用发汗剂的流量作为控制变量,利用发展系的方法证明了系统的解在控制变量处沿任意方向上的方向导数存在,并由此给出了方向导数应满足的方程及系统达到最优控制应满足的必要条件,从而得到了系统具有可计算性的优化系。 相似文献
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大型实时数据库系统设计及并发控制调度 总被引:5,自引:0,他引:5
系统地分析了大型实时数据库系统的应用环境和功能需求,提出了企业大型实时数据库的体系结构、设计思路和实现方法,研究了实时主动数据库事务执行模式,提出了有效性检查并发控制协议。协议使用动态调整串行次序策略,避免不必要的事务重启动,并能有效降低事务延误截止时间。该实现方法在工程应用中取得了良好的效果。 相似文献