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惯性参考单元(IRU)是抑制运动载体光电跟瞄系统载体振动干扰的有效手段. IRU系统指向精度受机械谐振、传感噪声、驱动器输出纹波、基座角振动等内外部扰动影响,不同扰动的来源、特征均有所不同.对IRU系统的多源异质扰动抑制方法展开研究,在分析系统内外部扰动来源、特征的基础上,提出改进型扰动观测器(RDOB)结构,实现系统窄带大幅值扰动的抑制,结合扰动前馈结构,进一步提升系统对外部扰动的抑制能力,并通过仿真和实验验证控制方法的有效性.结果表明:基于RDOB与扰动前馈技术的控制结构能够实现100 Hz的位置控制带宽,多源异质扰动作用下的闭环指向精度为1μrad,对20 Hz外部扰动的抑制能力可达-32.03 dB,在0.1 mrad、20 Hz外部扰动作用下, IRU系统对0.2 mrad、1 Hz正弦信号的跟踪精度为6.1μrad. 相似文献
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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
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针对同时含有未知输入和测量干扰的不确定系统研究了全维和降维观测器设计问题. 首先, 利用待定系数法给出了全维观测器的结构和存在条件. 该条件完全由原系统的系统矩阵给出, 易于检验. 对于降维观测器, 为了消除测量干扰的影响, 提出了一种新的测量输出构造方法, 使得新构造的测量输出不再包含干扰信号. 此外, 证明了全维和降维观测器存在条件的内在统一性, 即全维观测器所需要满足的观测器匹配条件和强可检测条件在研究降维观测器所要讨论的新的系统中都可以得到保持. 因而, 在全维观测器存在条件下, 也可以设计一个相应的降维观测器. 最后, 给出了一个数值例子验证所提方法的有效性. 相似文献
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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
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由于高旋武器弹药在初始时刻具有高转速和高加速度的特点,使半捷联MEMS惯性测量系统的减旋系统超调大,致使MEMS惯性传感器测得瞬时数据大,超出量程,影响数据分析与解算,提出一种适用于高旋弹用的多量程传感器组合设计,采用多量程的惯性传感器和MIMU组合将弹体各个飞行阶段的数据进行测量;用A/D转换器将其输出的模拟量转换为数字量,通过FPGA模拟通信口接收数据并存储在FLSAH中,实现对半捷联惯性测量系统的实时记录.通过高速飞行仿真转台试验验证:该设计能实时准确采集并存储弹体信息,对常规弹药的制导化具有很大的应用价值. 相似文献
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Antidisturbance control problem is discussed for stochastic systems with multiple heterogeneous disturbances, which include the white noise and the disturbance with unknown frequencies and amplitudes. An adaptive disturbance observer is designed to estimate the disturbance with unknown frequencies and amplitudes, based on which, an adaptive disturbance observer‐based control scheme is proposed by combining adaptive technique and linear matrix inequality method. It is proved that the closed‐loop system is asymptotically bounded in mean square when multiple heterogeneous disturbances exist simultaneously and that the equilibrium is globally asymptotically stable in probability as additive disturbance disappears. Finally, two simulation examples, including a wind turbine system, are given to show the effectiveness of the proposed scheme. 相似文献
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This paper addresses the problems of disturbance estimation and anti‐disturbance control for nonlinear system with exogenous disturbance, which is generated from an unknown exogenous system. The state observer and the adaptive disturbance observer are designed, simultaneously. Compared with the existing methods, which assumed that the exogenous system parameter matrix was known, our disturbance observer is more applicable in practice. Utilizing the estimation information, an observer‐based dynamic output feedback controller is designed, which avoids the influence of output disturbance on the closed‐loop system, and contains a disturbance compensation term to compensate the input disturbance. Finally, simulations are provided to demonstrate the effectiveness of the proposed approach. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Wen-Hua CHEN 《控制理论与应用(英文版)》2018,16(4):284-300
This paper gives an overview of early development of nonlinear disturbance observer design technique and the disturbanceobserver based control (DOBC) design. Some critical points raised in the development of the methods have been reviewed anddiscussed which are still relevant for many researchers or practitioners who are interested in this method. The review is followedby the development of a new type of nonlinear PID controller for a robotic manipulator and its experimental tests. It is shown that,under a number of assumptions, the DOBC consisting of a predictive control method and a nonlinear disturbance observer couldreduce to a nonlinear PID with special features. Experimental results show that, compared with the predictive control method,the developed controller significantly improves performance robustness against uncertainty and friction. This paper may triggerfurther research and interests in the development of DOBC and related methods, and building up more understanding betweenthis group of control methods with comparable ones (particularly control methods with integral action). 相似文献
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This paper gives an overview of early development of nonlinear disturbance observer design technique and the disturbanceobserver based control (DOBC) design. Some critical points raised in the development of the methods have been reviewed anddiscussed which are still relevant for many researchers or practitioners who are interested in this method. The review is followedby the development of a new type of nonlinear PID controller for a robotic manipulator and its experimental tests. It is shown that,under a number of assumptions, the DOBC consisting of a predictive control method and a nonlinear disturbance observer couldreduce to a nonlinear PID with special features. Experimental results show that, compared with the predictive control method,the developed controller significantly improves performance robustness against uncertainty and friction. This paper may triggerfurther research and interests in the development of DOBC and related methods, and building up more understanding betweenthis group of control methods with comparable ones (particularly control methods with integral action). 相似文献
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This paper focuses on variable-speed wind turbines where control is aimed at stabilizing the output power. A hybrid control algorithm is proposed which includes a new arrangement of two controllers along with an observer. Estimation of power coefficient via sliding mode observer reduces the amount of errors caused by changing the power coefficient parameter in different turbines. Moreover, the use of this special arrangement of sliding mode controller, proportional-integral (PI) controller and sliding mode observer, removes one of the controller parameter denoting wind speed from the designed algorithm, which in turn eliminates disturbances related to wind speed changes. In order to show the efficiency of the proposed control method, the performances of the controllers are evaluated by simulation in MATLAB software. 相似文献
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运动控制是神经、运动和感觉功能的多方面协调及信息交互作用过程,探究运动系统中运动-生理信息间的关联关系对于理解人体运动控制机制具有重要意义。为此,本文通过对脑电信号(Electroencephalogram, EEG)和惯性信息中的加速度信号(Acceleration, ACC)进行相干分析,探究上肢静息态和任务态时EEG和ACC信号间的因果关系及演变规律。首先,通过对7名受试者的EEG和ACC信号进行预处理,去除信号中的干扰成分;进一步,分别计算在静息态、任务态(动态力、静态力)下的EEG和ACC信号间的相干性结果,并通过显著相干的阈值指标来计算显著性面积进而实现量化分析。结果显示,在动态力下的EEG-ACC相干显著性面积大于静态力下的值,静态力下的显著性面积大于静息态下的值;且分别在左、右侧上肢运动时,EEG的C3、C4通道与ACC间的显著性面积也呈现出在对侧运动脑区显著。研究结果表明,EEG和ACC信号间的同步特征在上肢运动的静息态、任务态(动态力、静态力)下有显著特征,这有助于深入理解神经-运动控制机制,为运动功能评估提供新的定量指标,进而为运动功能障碍疾病的早期诊断提供理论依据。 相似文献
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针对一类带有多源干扰的随机系统,研究其抗干扰控制问题.针对可以由未知参数的外源系统产生,代表频率、振幅和初相都未知的干扰,构建随机自适应干扰观测器对其进行估计.基于此,结合自适应控制和随机控制的方法,提出基于干扰观测器的抗干扰控制策略,保证复合系统的所有信号均为均方渐近有界.仿真结果验证了所提出方法的正确性和有效性. 相似文献
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Aldo Jonathan Muoz‐Vzquez Vicente Parra‐Vega Anand Snchez‐Orta Gerardo Romero‐Galvn David Lara‐Alabazares 《Asian journal of control》2020,22(5):1801-1810
In order to assure maximum energy conversion, the angular velocity of the wind turbine rotor tracks a nominal profile depending on the wind speed. However, conventionally, wind flows present non‐differentiable components due to turbulence and gust winds, which affect the wind energy management. Thus, a fast and robust controller is required to induce such nominal regime for maximum energy transfer. A fractional‐order nonlinear disturbance‐observer (FNDOB) is proposed in this paper to cancel the non‐differentiable components of the wind speed, as well as dynamic uncertainties and other aerodynamic disturbances. The proposed FNDOB is based on continuous fractional sliding modes, assuring that disturbances and uncertainties are exactly compensated in finite‐time. A representative simulation study for a variable‐speed wind turbine is presented to show the reliability of the proposed scheme, and a comparative analysis with respect to a conventional linear disturbance observer based control is presented. 相似文献
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邹永义 《自动化与仪器仪表》2012,(3):152-155
介绍了惯性测量组件常用的动态误差模型,讲解了对动态误差系数进行标定常用的恒速试验和角振动试验,在此基础上,重点讲述了优化改进的正交三轴匀角速率试验,对惯性测量组件的动态误差进行了较好的补偿。 相似文献