共查询到20条相似文献,搜索用时 82 毫秒
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查亚兵 《计算技术与自动化》1993,12(1):10-14
1 引言我们知道,针对线性离散模型:X_(k-1)=φ_(k+1),_kX_k+Γ_(k+1),_kU_k+W_k Z_k=H_kX_k+V_k如作下列假设:E[W_k]=q_k,E[W_kW_i~T]=Q_k δ_(k,i),Q_k≥0E[V_k)=γ_k,E[V_kV~T_i]=R_k δ_(k,i),R_k>0{V_k}、{W_k}、{X_0}互不相关δ_(k,i)为 Kroneker δ-函数,满足下列关系: 相似文献
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非线性模型结构辨识方法的分析 总被引:1,自引:0,他引:1
本文对模型拟合度判别法、交叉有效性确认法和统计假设检验法三种非线性模型结构辨识方法进行了分析比较,并将模型拟合度判别法推广到多变量系统的场合.通过计算机仿真实例,说明各种方法的实用性,找出最佳参数.最后,将它们进行了比较. 相似文献
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本文研究了用Hammstein模型描述的一类非线性系统的辨识问题,给出了这种模型辨识时的激励信号问题。 相似文献
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针对一类结构和参数均具备时变特性的复杂时变系统,提出一种新的基于联合滤波算法的在线自适应逆控制方法.该方法在处理参数时变问题的同时可兼顾系统的结构时变特性,实现复杂动态系统的在线跟踪控制.同时提出新的联合Volterra核函数滤波算法,该算法克服了原Volterra滤波器计算复杂运算速度慢的缺点,实现了动态非线性系统的在线跟踪控制.通过仿真分析可以得出,对于此类线性、非线性复杂时变系统,基于新的联合滤波器的自适应逆控制方法可以快速有效的实现动态对象在线建模与控制. 相似文献
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The performance of a linear Kalman filter will degrade when the dynamic noise is not Gaussian. A robust Kalman filter based on the m-interval polynomial approximation (MIPA) method for unknown non-Gaussian noise is proposed. Two situations are considered: (a) the state is Gaussian and the observation noise is non-Gaussian; (b) the state is non-Gaussian and the observation noise is Gaussian. It is shown, as compared with other non-Gaussian filters, the MIPA Kalman filter is computationally feasible, unbiased, more efficient and robust. For the scalar model, Monte Carlo simulations are given to demonstrate the ideas involved. 相似文献
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针对标准卡尔曼滤波器对系统的模型和噪声的统计特性依赖性强,而系统的准确数学模型难以建立的问题,结合联邦滤波和自适应估计理论,提出了一种基于联邦滤波的自适应算法。该算法通过残差的实际值与理论值的比值来确定误差方差阵的估计值,然后调节自适应卡尔曼滤波器的渐消因子,从而有效提高了联邦滤波器的适应能力。由仿真结果可知,改进的联邦滤波器能较好地利用测量信息对系统的相关参数进行自适应的调整,滤波结果具有很好稳定性和准确性。 相似文献
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YE Min DOU SuGuang ZHANG Wei & ZENG ZhiGang School of Aeronautics Astronautics Zhejiang University Hangzhou China College of Mechanical Engineering Beijing University of Technology Beijing 《中国科学:信息科学(英文版)》2011,(8)
In this paper, the incremental harmonic balance nonlinear identification (IHBNID) is presented for modelling and parametric identification of nonlinear systems. The effects of harmonic balance nonlinear identification (HBNID) and IHBNID are also studied and compared by using numerical simulation. The effectiveness of the IHBNID is verified through the Mathieu-Duffing equation as an example. With the aid of the new method, the derivation procedure of the incremental harmonic balance method is simplified. The... 相似文献
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Tong
Ma 《国际强度与非线性控制杂志
》2020,30(12):4652-4675
》2020,30(12):4652-4675
This paper presents a novel decentralized filtering adaptive constrained tracking control framework for uncertain interconnected nonlinear systems. Each subsystem has its own decentralized controller based on the established decentralized state predictor. For each subsystem, a piecewise constant adaptive law will generate total uncertainty estimates by solving the error dynamics between the host system and decentralized state predictor with the neglection of unknowns, whereas a decentralized filtering control law is designed to compensate both local and mismatched uncertainties from other subsystems, as well as achieve the local objective tracking of the host system. The achievement of global objective depends on the achievement of local objective for each subsystem. In the control scheme, the nonlinear uncertainties are compensated for within the bandwidth of low‐pass filters, while the trade‐off between tracking and constraints violation avoidance is formulated as a numerical constrained optimization problem which is solved periodically. Priority is given to constraints violation avoidance at the cost of deteriorated tracking performance. The uniform performance bounds are derived for the system states and control inputs as compared to the corresponding signals of a bounded closed‐loop reference system, which assumes partial cancelation of uncertainties within the bandwidth of the control signal. Compared with model predictive control (MPC) and unconstrained controller, the proposed control architecture is capable of solving the tracking control problems for interconnected nonlinear systems subject to constraints and uncertainties. 相似文献
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对一类非线性离散时间系统提出了模糊辨识方法,此方法用与未知参数向量成线性关系的模糊逻辑系统作为辨识模型,并通过自适应学习律对此模糊逻辑系统中的未知参数进行自适应调节,文中证明了此方法可使辨识误差收敛到原点的一个邻域内。仿真结果验证了此方法的有效性。 相似文献