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1.
    
The position synchronization control (PSC) problem is studied for networked multi-axis servo systems (NMASSs) with time-varying delay that is smaller than one sampling period. To improve the control performance of the system, time-varying delays, modeling uncertainties, and external disturbances are first modeled as a lumped disturbance. Then, a linear extended state observer (LESO) is devised to estimate the system state and the lumped disturbance, and a linear feedback controller with disturbance compensation is designed to perform individual-axis tracking control. After that, a cross-coupled control approach is used to further improve synchronization performance. The bounded-input-bounded-output (BIBO) stability of the closed-loop control system is analyzed. Finally, both simulation and experiment are carried out to demonstrate the effectiveness of the proposed method.   相似文献   

2.
自抗扰控制技术应用已日渐成熟, 但当系统中存在高频非平稳噪声信号时, 线性自抗扰控制(LADRC) 存在难以选取合适的观测器带宽的问题: 当带宽较小时, 线性扩张状态观测器(LESO)难以实现对总扰动的实时观测, 会造成时滞; 当带宽较大时, LESO又会放大噪声对系统的影响, 从而造成总扰动观测失真. 为了解决这一问题, 将小波降噪环节加入LADRC中, 通过设计基于滑动窗实时小波降噪的LESO, 对含噪输出信号进行实时降噪. 使用Simulink搭建系统模型, 分别在输出信号中加入高斯白噪声或谐波等不同类型的高频非平稳噪声进行仿真实验, 并将所提方法与滑动平均法进行对比, 结果验证了所提方法的有效性.  相似文献   

3.
自抗扰控制技术应用已日渐成熟,但当系统中存在高频非平稳噪声信号时,线性自抗扰控制(LADRC)存在难以选取合适的观测器带宽的问题:当带宽较小时,线性扩张状态观测器(LESO)难以实现对总扰动的实时观测,会造成时滞;当带宽较大时,LESO又会放大噪声对系统的影响,从而造成总扰动观测失真.为了解决这一问题,将小波降噪环节加入LADRC中,通过设计基于滑动窗实时小波降噪的LESO,对含噪输出信号进行实时降噪.使用Simulink搭建系统模型,分别在输出信号中加入高斯白噪声或谐波等不同类型的高频非平稳噪声进行仿真实验,并将所提方法与滑动平均法进行对比,结果验证了所提方法的有效性.  相似文献   

4.
    
The existing active disturbance rejection control (ADRC) method may not provide sufficient disturbance rejection to multiple mismatched disturbances for the fractional order systems. In this paper, a composite disturbance rejection approach is developed for a class of fractional order uncertain systems, by synthesizing the fractional order ADRC (FOADRC) approach and a disturbance observer (DO)-based compensation scheme. Taking advantage of more disturbance information and a filter structure, an improved DO is developed to achieve precise estimation of disturbances in the presence of sensor noises. In addition, a state transformation is developed to convert the system into a simple integral chain model with only matched disturbances. Then a composite control law is designed to compensate the disturbances and provide satisfying dynamic performance. The efficiency of the proposed method is demonstrated by a numerical simulation and an actual servo control simulation, as well as the comparison with two kinds of the existing ADRC methods and the commonly used integral sliding mode control (I-SMC) method.  相似文献   

5.
为了解决非线性扩张状态观测器(NLESO)对大幅度扰动估计能力有限的问题,本文提出一种线性/非线性切换扩张状态观测器.首先分析了非线性扩张状态观测器对大幅度扰动估计能力有限的原因,然后提出在NLESO的非线性区间引入一段线性扩张状态观测器(LESO)弥补NLESO的缺陷,其次从理论上证明了提出的线性/非线性切换扩张状态观测器的收敛性.最后,通过数值仿真验证了提出的线性/非线性切换扩张状态观测器的可行性.  相似文献   

6.
    
Piezoelectric beam dynamics are characterized by elastic properties, nonlinearities, uncertainties, and unknown disturbances, thus making vibration suppression a challenging control problem. To meet this challenge, a novel active control method has been designed and rigorously tested on actual hardware without the requirement of extensive modeling. In this unique approach, the piezoelectric beam dynamics, known or unknown, linear or nonlinear, and all external disturbances are treated in their totality as an input disturbance which is subsequently estimated and canceled in real time, reducing the challenging problem to a very manageable one. Simulation and experimental results demonstrate the effectiveness of this practical control method. The frequency domain characteristics of the proposed method are analyzed using Bode and describing function methods.  相似文献   

7.
针对电静液作动器(electro-hydrostatic actuators, EHA)系统存在内外部扰动、参数不确定性和变控制增益等问题,提出一种基于模型信息的降阶线性自抗扰位置控制方法.首先,基于系统模型信息选取控制增益.其次,通过降阶线性扩张观测器对系统总扰动进行估计,并在控制器中加入扰动项进行补偿.利用奇异摄动理论证明所提控制器可使闭环系统是半全局最终一致有界的,并且当观测器带宽足够大时,所提出的控制器理论上可以使系统输出以所需精度跟踪期望轨迹.仿真结果表明,所提控制方法响应速度较快,控制精度较高,对外部扰动和参数不确定性具有较强的鲁棒性.  相似文献   

8.
谭程元  王晶 《控制理论与应用》2018,35(11):1680-1686
针对一类包含模型不确定和外界干扰等非重复扰动的线性离散系统,本文通过将迭代学习控制与自抗扰技术相结合,提出一种新的基于扩张观测器的鲁棒迭代学习控制方法.本文以时间轴和迭代轴两个方向同时出发考虑系统的非重复扰动估计和稳定收敛问题.将与时间和迭代轴同时相关的模型不确定及外界干扰等因素归纳为系统总扰动,针对其非重复变化特性给出了扩张观测器的设计,保证在批次内快速、准确地估计系统总扰动;基于上述扰动估计,设计新型的迭代学习控制律,利用线性矩阵不等式方法证明了整个鲁棒迭代学习系统的稳定性和收敛性,并给出合理的控制器参数估计条件.此外,讨论了迭代学习控制中第一批次的控制律设计问题,给出合理的自抗扰控制器设计.最后通过仿真对比实验验证了本文方法的可行性和有效性.  相似文献   

9.
为实现导弹对目标的高精度拦截, 本文提出了基于加权齐次函数的非线性自抗扰拦截制导设计方法. 首先, 提出了基于加权齐次函数的非线性扩张状态观测器在线估计视线角速率和由目标加速度等内外不确定性因素构成的总扰动. 其次, 设计了基于非线性扩张状态观测器的非线性自抗扰三维制导律对总扰动进行补偿, 该制导律克服了高阶非线性项与强耦合项等不利因素的影响, 提高了拦截制导精度. 本文通过分析误差系统的动力学行为证明了闭环制导系统的稳定性和收敛性. 本文提出的方法在拦截精度等方面优于已有的基于线性扩张状态观测器和基于fal函数的扩张状态观测器的自抗扰制导方法. 仿真结果验证了本文所提出方法的有效性和优越性.  相似文献   

10.
用于带有量测噪声系统的新型扩张状态观测器   总被引:5,自引:0,他引:5       下载免费PDF全文
提出了扩张状态观测器的一种新的形式,用于处理量测环节带有噪声干扰时的情况.ESO可以对不确定系统中的内外扰动进行观测,并以此为基础构成自抗扰控制器.但其性能会受量测噪声的影响.本文利用滤波器消除噪声的影响,并把已知的滤波器方程扩展到原有的ESO中,以补偿滤波器对实际输出信号的偏移作用.数字仿真表明,该方法可以有效的解决输出噪声对扩张状态观测器的影响.  相似文献   

11.
作为一种有效的控制设计方法, 自抗扰控制研究获得了广泛关注, 然而针对自抗扰控制器的参数整定方法则相对较少. 本文针对一阶惯性加延迟系统, 将线性自抗扰控制转化为内模控制结构, 导出了其中控制器、滤波器、乘性不确定性、互补灵敏度函数的对应表达式, 随后, 利用频域鲁棒稳定性判据, 分析了自抗扰控制器核心—–扩张状态观测器的参数对闭环系统稳定性的影响. 基于该分析, 总结出一阶惯性加延迟系统扩张状态观测器的两条参数整定准则. 数值仿真结果验证了该整定准则的有效性.  相似文献   

12.
    
The paper proposes a novel control design for nonlinear systems with multiple uncertainties and nonlinear measurement. The output linearization is utilized to handle the nonlinearities in system dynamics and measurement. Firstly, the integrator chain for nonlinear systems with multiple uncertainties is analyzed. Based on the fundamental integrator chain form, the equivalent total effect of multiple uncertainties is summarized as total disturbance. By timely estimating and compensating for the total disturbance, an active disturbance rejection control design to handle both multiple uncertainties and nonlinear measurement is proposed. Moreover, the transient performance of the corresponding closed‐loop system is rigorously studied, which theoretically reveals the high consistence of the tracking performance despite various multiple uncertainties.  相似文献   

13.
    
This paper investigates active disturbance rejection control involving the fractional‐order tracking differentiator, the fractional‐order PID controller with compensation and the fractional‐order extended state observer for nonlinear fractional‐order systems. Firstly, the fractional‐order optimal‐time control scheme is studied to propose the fractional‐order tracking differentiator by the Hamilton function and fractional‐order optimal conditions. Secondly, the linear fractional‐order extend state observer is offered to acquire the estimated value of the sum of nonlinear functions and disturbances existing in the investigated nonlinear fractional‐order plant. For the disturbance existing in the feedback output, the effect of the disturbance is discussed to choose a reasonable parameter in fractional‐order extended state observer. Thirdly, by this observed value, the nonlinear fractional‐order plant is converted into a linear fractional‐order plant by adding the compensation in the controller. With the aid of real root boundary, complex root boundary, and imaginary boot boundary, the approximate stabilizing boundary with respect to the integral and differential coefficients is determined for the given proportional coefficient, integral order and differential order. By choosing the suitable parameters, the fractional‐order active disturbance rejection control scheme can deal with the unknown nonlinear functions and disturbances. Finally, the illustrative examples are given to verify the effectiveness of fractional‐order active disturbance rejection control scheme. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

14.
将线性自抗扰控制应用于磁通切换永磁电机(FSPMM)的无速度传感器控制中,采用线性扩张状态观测器(LESO)构造FSPMM的转速观测器,实现对转速准确而快速的实时估计;设计线性自抗扰控制器(LADRC)作为转速环调节器,系统的鲁棒性被提高了.仿真结果验证了所设计的基于LESO的无传感器LADRC控制策略能够使FSPMM可靠稳定运行,LESO提升了系统的观测精度和响应速度,克服了滑模观测器(SMO)带来的高频抖振和滞后现象;与基于SMO的无传感器PI控制策略相比,所提的控制策略在负载扰动和参数摄动时具有更强的鲁棒性.  相似文献   

15.
三阶扩张状态观测器的优化参数配置方法   总被引:2,自引:0,他引:2  
陈松林  赵海香 《控制与决策》2014,29(10):1851-1855
研究三阶非线性扩张状态观测器扰动观测性能的优化问题。首先,采用系数冻结法固定与观测器状态相关的非线性系数,利用线性系统的极点配置方法进行频带拓展;然后,分析配置后的极点随非线性系数的变化规律,在此基础上,提出一种保证扰动观测带宽受系统状态变化影响最小的参数配置方法;最后,通过算例和仿真对比表明了所提出参数配置方法的有效性和优越性。  相似文献   

16.
线性自抗扰控制的抗饱和补偿措施   总被引:1,自引:0,他引:1       下载免费PDF全文
周宏  谭文 《控制理论与应用》2014,31(11):1457-1463
控制输入约束是实际工业过程中普遍存在的现象,然而控制器设计中通常都假设执行机构动态是线性的,因此当执行机构存在约束时,执行机构输出信号与控制器输出信号不一致,使系统的动态性能降低,甚至导致系统不稳定.本文针对线性自抗扰控制(linearactive disturbance rejection control,LADRC)执行机构的约束问题,提出两种抗饱和补偿方案,利用LADRC扩张状态观测器估计控制器状态或者控制器输出与执行器输出的误差,从而使LADRC能快速消除饱和.将这两种方法用到含执行机构饱和的一阶惯性加迟延被控对象进行仿真研究,结果表明两种补偿措施下线性自抗扰控制器能得到较好的控制性能.随后本文将LADRC抗饱和思想推广到负荷频率控制系统(load frequency control,LFC)中,仿真表明基于误差补偿的抗饱和方案对于LFC系统更为有效.  相似文献   

17.
黄东  孙国法 《控制理论与应用》2016,33(11):1501-1507
本文针对高阶时延系统同时存在系统不确定性和未知输入时延的情况,考虑控制器信号的复杂性问题,在动态面控制方法的基础上,引入自抗扰控制技术设计了自抗扰动态面控制器.利用反步法设计动态面控制信号,采用跟踪微分器对虚拟控制信号滤波,避免了由于对虚拟控制信号重复微分产生的\"复杂性爆炸\"问题;在控制信号的基础上叠加扰动补偿项,补偿项由扩张状态观测器实时在线估计产生,保证了控制信号的实时性,同时简化了控制器结构以便于实际应用.在闭环系统稳定性判别中运用李雅普诺夫理论做出详细分析.最后,数值仿真结果验证了所提出方法的有效性.  相似文献   

18.
高增益的线性自抗扰控制(linear active disturbance rejection control, LADRC),应用于系统输出被噪声污染的场合时,性能会受到较大的影响和限制.针对经典滤波算法噪声抑制效果差,带宽损失严重的问题,提出利用噪声观测器(noise observer, NOB)降低LADRC噪声敏感,从而提高系统带宽的控制策略.首先,分析LADRC的频域特性和离散化效果,明确传感噪声对系统带宽的影响;然后,介绍基于NOB的LADRC实现,并进行系统内稳定性的分析;最后,针对惯性参考单元的位置环,将所提出方案与低通滤波器、预报式跟踪微分器进行对比分析.仿真结果表明,NOB能够在抑制噪声的同时,减小相位损失;硬件实验表明,引入NOB滤波的LADRC,驱动信号的RMSE降低至LADRC的20.47%,系统阶跃响应的上升时间减少56.67%,表明NOB对于降低LADRC的噪声敏感,提高系统带宽具有显著效果,具备相当的工程实践意义.  相似文献   

19.
液压位置伺服系统滑模自抗扰控制器设计   总被引:1,自引:0,他引:1  
主要研究了驱动连铸结晶器的液压伺服系统的精确位置跟踪控制问题。由于液压伺服系统的某些内部参数是时变且不可测的,同时外部负载力也随时间变化使得系统动态模型不精确,从而影响了系统的控制效果。针对这一问题,提出了一种基于滑模控制的自抗干扰控制器的设计方法,利用扩张状态观测器把系统内部参数和外部负载力的不确定性观测出来,从而有效地抵消了系统的不确定性。根据工程实际中的参数进行仿真研究,其结果表明这种控制方法具有很好的全局鲁棒性,并且提高了位置跟踪的精度。  相似文献   

20.
    
A flatness-based active disturbance rejection control approach is proposed to deal with the linear systems with unknown time-varying coefficients and external disturbances. By selecting appropriate nominal values for the parameters of the system, all the deviation between the nominal and actual dynamics of the controlled process, as well as all the external disturbances can be viewed as a total disturbance. Based on the accurately estimated total disturbance with the aid of the proposed extended state observer, a linear proportional derivative feedback control law taking into account the derivatives of the desired output is designed to eliminate the effect of the total disturbance on the system performance. Finally, the load frequency control problem of a single-area power system with non-reheated unit is employed as an illustrative example to demonstrate the effectiveness of the proposed approach.  相似文献   

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