共查询到20条相似文献，搜索用时 937 毫秒
1.
研究了执行器饱和条件下切换系统原点吸引区的估计及扰动抑制问题。对给定的反馈矩阵和切换方案,利用辅助反馈增益矩阵,首先给出了无扰动情况下用椭圆区域描述的包含切换系统原点的不变集条件。然后将这个条件扩展到系统包含有界扰动的情形．提出了一种新的判断椭圆区域是否切换系统的不变集的条件。将所得到的条件描述为变参数的线性矩阵不等式（LMI）,用基于LMI的方法建立状态反馈律并使系统保证稳定性的同时抑制扰动。仿真结果证明了这种方法的有效性。 相似文献
2.
3.
非线性不确定系统的模糊自适应 输出反馈跟踪 总被引：2，自引：0，他引：2
本文研究了非仿射非线性系统的模糊自适应 输出反馈跟踪。在非仿射非线性模型存在不确定的情况下，使用模糊自适应控制器对系统进行控制，并基于Lyapunov稳定性定理得出自适应律。通过解一个代数Riccati方程实现了 跟踪性能。估计状态通过引入高增益观测器得到，实现了系统的输出反馈控制。最后，通过对一个数值例子的仿真验证了算法的有效性。 相似文献
4.
管理研究问题确定的准则及过程 总被引：6，自引：0，他引：6
本文定义了管理问题求解难度及研究者的研究能力，结合两者，给出了管理研究问题确定的最优准则的矩阵形式表示。将并管理研究问题确定看作为一项重要决策，划分其为四个阶段六个步骤，每步骤可能会有反馈的过程。 相似文献
5.
戴立意 《中国科学院研究生院学报》1987,(1)
本文讨论了广义线性系统E■=Ax+Bu,y=Cx受限制等价下的三种等价形式,以及在每一种等价形式下的能控性、能观性,判别方法和它们在计算反馈增益矩阵中的应用。 相似文献
6.
《科技通报》2016,(1)
对光伏发电系统的太阳能采集板的能效最优倾角的准确计算可以改善电机的转矩输出,提高对光伏电机的输出功率增益。当前的光伏发电系统的能效最优倾角估算方法采用贝叶斯参量估计算法,随着电机磁损耗的增加,导致能效最优倾角参量估计精度不高。提出一种基于电磁耦合器轴向切面磁场估计的光伏发电系统的能效最优倾角计算方法。分析了光伏发电系统的电磁耦合系统结构模型,利用蓄电池放电率特性修正原则,建立光伏发电系统的能效最优倾角目标函数,实现能效控制输出的目标参量系统传递函数构建,设计电磁耦合器轴向切面磁场估计算法,实现对光伏发电系统的能效最优倾角计算的算法改进。仿真结果表明,采用该算法进行光伏发电系统中能效最优倾角的计算,精度较高,优化了太阳能向电能的转换过程,有效提高对光伏发电系统的输出功率增益。 相似文献
7.
本文在多输入多输出(MIMO)系统中提出了4×2MIMO、发送数据流为2的系统的预编码方案,该方案不需要反馈CSI.接收端以均方差(MSE)最小准则从码本中选择一个编码矩阵,然后反馈该码字的索引. 相似文献
8.
以跨阻运算放大器(ROA)作开环元件,设计反馈电压放大器,分析其闭环带宽与增益的关系,结果表明:基于ROA的反馈电压放大器的带宽与增益相互独立,带宽可在增益改变下保持常数.环增益对带宽具有决定性作用.讨论了ROA参数对带宽与增益之间关系的影响,用SPICE模拟结果验证了所作分析与讨论. 相似文献
9.
10.
《科技通报》2015,(10)
设计低通陷波器对提高信号检测精度具有重要价值,从而实现对单频信号及包含线谱成分的信号检测。传统的低通陷波器设计方案采用二阶自适应格型IIR陷波器,信号和背景噪声形成同构,导致滤波性能不好。提出一种基于高频调幅增益多路反馈的低通陷波器优化设计方法。分析低通陷波器幅频响,进行硬件电路设计,采用DSP的电源电路对陷波器进行供电,通过自适应级联方法进行陷波设计,用多个固定陷波器级联抑制干扰成份,得到基于高频调幅增益多路反馈的低通陷波器,仿真实验表明,采用该陷波器进行信号采集和滤波,具有较好的信号输出增益,滤波性能较好,提高了对目标信号的检测能力,展示了较好的应用价值。 相似文献
11.
In this paper, the optimal synchronization controller design problem for complex dynamical networks with unknown system internal dynamics is studied. A necessary and sufficient condition on the existence of the optimal control minimizing a quadratic performance index is given. The optimal control law consists of a feedback control and a compensated feedforward control, and the feedback control gain can be obtained by solving the well-known Algebraic Riccati Equation (ARE). Especially, in the presence of unknown system dynamics, a novel adaptive iterative algorithm using the information of system states and inputs is proposed to solve the ARE to get the optimal feedback control gain. Finally, a simulation example shows the effectiveness of the theoretical results. 相似文献
12.
This paper investigates the adaptive output feedback control problem for a class of nonlinear systems with unknown time delays and output function. The system satisfies linear growth condition with an unknown growth rate. First of all, based on a dynamic gain scaling technique, we present a new dynamic high-gain observer without requiring precise information of the output function. Then, by employing the idea of universal control and the backstepping method, a universal adaptive output feedback control law is designed to globally regulate all the states of the system. A simulation example is presented to illustrate the effectiveness of the proposed design scheme. 相似文献
13.
Yafeng Li Ju H. Park Changchun Hua Qing Geng 《Journal of The Franklin Institute》2021,358(3):1743-1764
In this paper, the global output feedback tracking control is investigated for a class of switched nonlinear systems with time-varying system fault and deferred prescribed performance. The shifting function is introduced to improve the traditional prescribed performance control technique, remove the constraint condition on the initial value, and make the constraint bounds have more alternative forms. To estimate the unmeasured state variables and compensate the system fault, the switched dynamic gain extended state observer is constructed, which relaxes the traditional Lipschitz conditions on the nonlinear functions. Based on the proposed observer, by constructing the new Lyapunov function and using the backstepping method, the global robust output feedback controller is designed to make the output track the reference signal successfully, and after the adjustment time, the tracking error enters into the prescribed set. The stability of the system is analyzed by the average dwell time method. Finally, simulation results are given to illustrate the effectiveness of the proposed method. 相似文献
14.
In this paper, the problem of output feedback robust H∞ control for spacecraft rendezvous system with parameter uncertainties, disturbances and input saturation is investigated. Firstly, a full-order state observer is designed to reconstruct the full state information, whose gain matrix can be obtained by solving the linear matrix inequality (LMI). Subsequently, by combining the parametric Riccati equation approach and gain scheduled technique, an observer-based robust output feedback gain scheduled control scheme is proposed, which can make full use of the limited control capacity and improve the control performance by scheduling the control gain parameter increasingly. Rigorous stability analyses are shown that the designed discrete gain scheduled controller has faster convergence performance and better robustness than static gain controller. Finally, the performance and advantage of the proposed gain scheduled control scheme are demonstrated by numerical simulation. 相似文献
15.
Xianglei Jia Shengyuan Xu Xiaocheng Shi Zhengqiang Zhang 《Journal of The Franklin Institute》2021,358(6):2987-3009
In this paper, global practical tracking is investigated via output feedback for a class of uncertain nonlinear systems subject to unknown dead-zone input. The nonlinear systems under consideration allow more general growth restriction, where the growth rate includes unknown constant and output polynomial function. Without the precise priori knowledge of dead-zone characteristic, an input-driven observer is designed by introducing a novel dynamic gain. Based on non-separation principle, a universal adaptive output feedback controller is proposed by combining dynamic high-gain scaling approach with backstepping method. The controller proposed guarantees that the closed-loop output can track any smooth and bounded reference signal by any small pre-given tracking error, while all closed-loop signals are globally bounded. Finally, simulation examples are given to illustrate the effectiveness of our dynamic output feedback control scheme. 相似文献
16.
Yafeng Li Liuliu Zhang Changchun Hua Yu Zhang Xinping Guan 《Journal of The Franklin Institute》2018,355(3):1073-1087
This paper investigates the output feedback control for a class of stochastic nonlinear time delay systems based on dynamic gain technique. The nonlinear terms of the stochastic system satisfy linear growth condition on unmeasured state variables with the output dependent incremental rate, which makes the studied time delay stochastic system more general than the exiting results. Firstly, the full order dynamic gain observer is constructed. Then, the linear-like controller is designed without using recursive design method. Next, the stability analysis is given and a useful corollary is obtained. Finally, a simulation is given to illustrate the effectiveness of the proposed method. 相似文献
17.
A well-known method of eigenvalue assignment by static output feedback is improved. The main result is a parametric expression for the output feedback controller gain matrix explicitly characterized by the set of non-linear system of equations obtained for the state feedback design and the set of linear equations resulting from static output feedback consideration. In practice, it is shown that all the possible controllers can be generated for exactly assigning the prescribed eigenvalues of the nominal plant by appropriate software for solving the set of non-linear system of equations thus obtained. This in turn makes it possible to select the output feedback matrix with minimum norm or other constraints. Some numerical examples are presented to illustrate the design technique. 相似文献
18.
Xiandong Chen Xianfu Zhang Chenghui Zhang Le Chang 《Journal of The Franklin Institute》2018,355(9):3895-3910
In this paper, a novel control strategy is proposed for asymptotically stabilizing chained nonholonomic systems with input delay. Firstly, by using the input-state-scaling technique and the static gain control method, the stabilization control problem of such systems is transformed into designing two gain parameters to stabilize a class of generalized feedback systems with state delay. Then, based on the Lyapunov–Krasovskii theorem, the stability analysis of the closed-loop systems is achieved by the appropriate selection of the gain parameters, and the state and output feedback controllers are constructed simultaneously. An illustrative example is also provided to demonstrate the effectiveness of the proposed strategy. 相似文献
19.
20.
This paper deals with chained form systems with strongly nonlinear disturbances and drift terms. The objective is to design robust nonlinear output feedback laws such that the closed-loop systems are globally exponentially stable. The systematic strategy combines the input-state-scaling technique with the so-called backstepping procedure. A dynamic output feedback controller for general case of uncertain chained system is developed with a filter of observer gain. Furthermore, two special cases are considered which do not use the observer gain filter. In particular, a switching control strategy is employed to get around the smooth stabilization issue (difficulty) associated with nonholonomic systems when the initial state of system is known. 相似文献