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基于H∞/H2的多变量约束热轧带钢AGC鲁棒控制 总被引:1,自引:0,他引:1
研究了热轧带钢自动厚度控制(AGC)的鲁棒控制问题.为了消除轧制过程中其它变量对厚度控制精度的影响,提出了一种基于H∞/H2的多变量约束控制策略.首先,采用高阶未建模扰动对控制输入传函的H∞范数作为鲁棒性能指标,张力与活套等约束量对输出评价信号传函的H2范数作为LQG性能指标,建立了受约束的厚度控制模型.其次,设计了H∞/H2状态反馈鲁棒控制器,把受约束的AGC控制转化为系统在模型摄动与外界扰动下满足一定性能指标的鲁棒控制问题.最后,仿真结果表明,所设计的H∞/H2控制器具有良好的鲁棒控制特性. 相似文献
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研究了热轧带钢自动厚度控制(AGC)的鲁棒控制问题.为了消除轧制过程中其它变量对厚度控制精度的影响,提出了一种基于H∞/H2的多变量约束控制策略.首先,采用高阶未建模扰动对控制输入传函的H∞范数作为鲁棒性能指标,张力与活套等约束量对输出评价信号传函的H2范数作为LQG性能指标,建立了受约束的厚度控制模型.其次,设计了H∞/H2状态反馈鲁棒控制器,把受约束的AGC控制转化为系统在模型摄动与外界扰动下满足一定性能指标的鲁棒控制问题.最后,仿真结果表明,所设计的H∞/H2控制器具有良好的鲁棒控制特性. 相似文献
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针对具有参数摄动和状态时延的时滞不确定飞行系统,提出了一种神经网络非脆弱H∞控制方案。该方案将鲁棒H∞控制和神经网络控制结合起来,利用径向基神经网络的非线性逼近能力,对飞行系统的非线性不确定项进行逼近。由线性矩阵不等式(LMI)设计系统标称部分的鲁棒控制器,然后利用神经网络的输出来消除系统控制输入中的不确定部分。Lyapunov稳定性分析中,综合考虑了系统参数摄动、时延和神经网络逼近误差的影响,并证明了在所设计的飞行控制器作用下,闭环系统的稳定性。仿真实例验证了提出的飞行控制方案的可行性和有效性。 相似文献
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1引言Doyle在1982年提出的结构奇异值(μ)方法是分析和综合结构式不确定系统的有力工具[1,2].基于结构奇异值分析的小μ定理[2]给出了具有多个摄动块的线性动态系统鲁棒稳定的充要条件.而鲁棒性能定理[2]则进一步地将鲁棒稳定性问题和鲁棒性能问题统一成μ分析问题.然而.我们注意到,在所有研究结构奇异值的文献中,均要求块对角摄动矩阵中每个子摄动块是方的.这一要求无疑大大限制了μ方法的应用,因为非方摄动块在系统中是经常存在的.此时对Doyle给出的结构奇异值的上界函数[1]必须进行修正.2非方… 相似文献
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This paper presents a method that reduces the conservatism inherent in the disturbance representation in standard H ∞ theory. It addresses several discrete-time control synthesis problems where the disturbances acting on the system are structured by a convex family of linear filters (‘signal polytope’) and where the system disturbance attenuation level attained over the signal polytope is ensured to (just) a prescribed probability. This setup enables realistic multi-feature disturbance delimiting while accounting for uncertainty in the disturbance model itself by allowing probability waivers. The core of the probability aspects of the proposed solutions is the search for a truncated signal polytope which provides both the required probability and the best robust disturbance attenuation level. Many examples are given, including one of an aircraft output-feedback control with a polytope of low-pass filters representing different wind phenomena. The examples demonstrate that addressing realistic disturbances results in better control designs (hence better performance) and that a small certainty waiver can yield a large performance gain. 相似文献
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Chao Peng Zhenzhen Zhang Jianxiao Zou Kai Li Jian Zhang 《Journal of Process Control》2013,23(10):1415-1425
To reduce the adverse effects on the control performance and disturbance rejection caused by system uncertainty, a novel internal model based robust inversion feedforward and feedback 2DOF control approach was proposed for LPV system with disturbance. The proposed control approach combines the internal model control and robust inversion based 2DOF control, it utilizes internal model based control to reject external disturbance, utilizes robust inversion 2DOF control to enhance the control resolution and guarantee the system control performance. At first, a LMI synthesis approach for LPV system model identification and a disturbance compensator optimization design method which could minimize H∞ norm of output error caused by disturbance are presented. Then, combined with internal loop for disturbance compensation, a robust inversion feedforward controller is designed by robust inversion approach and the feedback controller which could render the requirements of reference signal tracking performance and robustness satisfied is obtained by the H∞ mixed sensitivity synthesis approach. Finally, atomic force microscopy (AFM) vertical positioning simulation experiments are conducted and the experiment results showed that the proposed control approach could achieve better output performance and disturbance rejection compared with conventional internal model based control and robust inversion based 2DOF control approach. 相似文献
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Some results on disturbance attenuation for Hamiltonian systems via direct discrete‐time design 下载免费PDF全文
The disturbance attenuation and robust disturbance attenuation problems for Hamiltonian systems in the discrete‐time setting are considered and some new results are presented. The new results are derived utilizing the recently presented dissipativity equality obtained by adding the dissipation rate function to the classical dissipativity inequality. A selection of the dissipation rate function yields new results. These results include a condition on the dissipation structure of the system to achieve the desired disturbance attenuation level and gives direct construction of optimal control laws for any desired disturbance attenuation level. The results remove the need to solve Hamilton–Jacobi–Isaacs inequalities. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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大气扰动下无人机纵向控制律设计研究 总被引:2,自引:1,他引:1
针对飞行控制系统设计中的大气扰动抑制问题进行了研究;讨论了Dryden紊流频域模型及时域对应的成形滤波器,建立了大气扰动下飞机纵向运动的小扰动方程;基于H∞控制理论,应用线性矩阵不等式(LMI)方法设计了鲁棒飞行控制系统;以某无人机纵向通道为例,选取全飞行包线内多个特征状态点,对设计的控制器进行仿真实验;仿真结果表明,所设计的控制器具有满意的干扰抑制能力和良好的鲁棒性及动态品质。 相似文献
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文中对多机电力系统,通过适当的坐标变换,基于耗散系统的概念,提出了一种新的通过干扰抑制实现的励磁鲁棒非线性分散控制策略。该控制策略可提高系统对动态不确定性的鲁棒性,抑制干扰对系统的影响。 相似文献