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State Feedback Sliding Mode Control without Chattering by Constructing Hurwitz Matrix for AUV Movement 被引量:4
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作者 Huan-Yin Zhou Kai-Zhou Liu Xi-Sheng Feng 《International Journal of Automation and computing》 EI 2011年第2期262-268,共7页
This paper presents a new method to eliminate the chattering of state feedback sliding mode control (SMC) law for the mobile control of an autonomous underwater vehicle (AUV) which is nonlinear and suffers from un... This paper presents a new method to eliminate the chattering of state feedback sliding mode control (SMC) law for the mobile control of an autonomous underwater vehicle (AUV) which is nonlinear and suffers from unknown disturbances system. SMC is a well-known nonlinear system control algorithm for its anti-disturbances capability, while the chattering on switch surface is one stiff question. To dissipate the well-known chattering of SMC, the switching manifold is proposed by presetting a Hurwitz matrix which is deducted from the state feedback matrix. Meanwhile, the best switching surface is achieved by use of eigenvalues of the Hurwitz matrix. The state feedback control parameters are not only applied to control the states of AUV but also connected with coefficients of switching surface. The convergence of the proposed control law is verified by Lyapunov function and the robust character is validated by the Matlab platform of one AUV model. 展开更多
关键词 Autonomous underwater vehicle (AUV) state feedback sliding mode control (SMC) switching manifold Hurwitz matrix Matlab platform Lyapunov function.
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Backstepping sliding mode control for uncertain strict-feedback nonlinear systems using neural-network-based adaptive gain scheduling 被引量:12
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作者 YANG Yueneng YAN Ye 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2018年第3期580-586,共7页
A neural-network-based adaptive gain scheduling backstepping sliding mode control(NNAGS-BSMC) approach for a class of uncertain strict-feedback nonlinear system is proposed.First, the control problem of uncertain st... A neural-network-based adaptive gain scheduling backstepping sliding mode control(NNAGS-BSMC) approach for a class of uncertain strict-feedback nonlinear system is proposed.First, the control problem of uncertain strict-feedback nonlinear systems is formulated. Second, the detailed design of NNAGSBSMC is described. The sliding mode control(SMC) law is designed to track a referenced output via backstepping technique.To decrease chattering result from SMC, a radial basis function neural network(RBFNN) is employed to construct the NNAGSBSMC to facilitate adaptive gain scheduling, in which the gains are scheduled adaptively via neural network(NN), with sliding surface and its differential as NN inputs and the gains as NN outputs. Finally, the verification example is given to show the effectiveness and robustness of the proposed approach. Contrasting simulation results indicate that the NNAGS-BSMC decreases the chattering effectively and has better control performance against the BSMC. 展开更多
关键词 backstepping control sliding mode control(SMC) neural network(NN) strict-feedback system chattering decrease
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Adaptive Interval Type-2 Fuzzy Sliding Mode Control Based on Feedback Linearization
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作者 Jing Hua Yang Cai Yimin Li 《控制工程期刊(中英文版)》 2014年第5期138-149,共12页
关键词 模糊滑模控制 反馈线性化 自适应 模式控制 区间 非线性系统 模糊系统 模糊逻辑控制
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Decoupled nonsingular terminal sliding mode control for affine nonlinear systems 被引量:1
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作者 Yueneng Yang Ye Yan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第1期192-200,共9页
A decoupled nonsingular terminal sliding mode control(DNTSMC) approach is proposed to address the tracking control problem of affine nonlinear systems.A nonsingular terminal sliding mode control(NTSMC) method is p... A decoupled nonsingular terminal sliding mode control(DNTSMC) approach is proposed to address the tracking control problem of affine nonlinear systems.A nonsingular terminal sliding mode control(NTSMC) method is presented,in which the nonsingular terminal sliding surface is defined as a special nonsingular terminal function and the convergence time of the system states can be specified.The affine nonlinear system is firstly decoupled into linear subsystems via feedback linearization.Then,a nonsingular terminal sliding surface is defined and the NTSMC method is applied to each subsystem separately to ensure the finite time convergence of the closed-loop system.The verification example is given to demonstrate the effectiveness and robustness of the proposed approach.The proposed approach exhibits a considerable advantage in terms of faster tracking error convergence and less chattering compared with the conventional sliding mode control(CSMC). 展开更多
关键词 nonlinear control feedback linearization terminal sliding mode control nonsingular affine nonlinear system.
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Finite-time Sliding Mode Control Design for a Class of Uncertain Conic Nonlinear Systems 被引量:3
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作者 Shuping He Jun Song 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2017年第4期809-816,共8页
This paper studies the sliding mode controller design problems for a class of nonlinear system. The nonlinear function is considered to satisfy conic-type constraint condition. A novel finite-time boundedness(FTB) bas... This paper studies the sliding mode controller design problems for a class of nonlinear system. The nonlinear function is considered to satisfy conic-type constraint condition. A novel finite-time boundedness(FTB) based sliding mode controller design theory is proposed. And then a sufficient condition is obtained in terms of linear matrix inequalities(LMIs), which guarantees the resulted sliding mode dynamics to be FTB wrt some predefined scalars. Thereafter, a FTB-based sliding mode control(SMC) law is synthesized to ensure the state of the controlled system is driven into a novel desired switching surface s(t) = c(c is a constant) in a finite time. Simulation results illustrate the validity of the proposed FTB-based SMC design theory. 展开更多
关键词 Conic nonlinear system finite-time boundedness(FTB) sliding mode control(SMC) STATE-feedback
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An Extended Sliding Mode Observer for Speed, Position and Torque Sensorless Control for PMSM Drive Based Stator Resistance Estimator 被引量:1
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作者 Pierre Tety Adama Konaté +2 位作者 Olivier Asseu Etienne Soro Pamela Yoboué 《Intelligent Control and Automation》 2016年第1期1-8,共8页
This paper presents a robust sixth-order Discrete-time Extended Sliding Mode Observer (DESMO) for sensorless control of PMSM in order to estimate the currents, speed, rotor position, load torque and stator resistance.... This paper presents a robust sixth-order Discrete-time Extended Sliding Mode Observer (DESMO) for sensorless control of PMSM in order to estimate the currents, speed, rotor position, load torque and stator resistance. The satisfying simulation results on Simulink/Matlab environment for a 1.6 kW PMSM demonstrate the good performance and stability of the proposed ESMO algorithm against parameter variation, modeling uncertainty, measurement and system noises. 展开更多
关键词 PMSM Extended Sliding mode Observer feedback control
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Sliding mode control of engine-variable pump-variable motor drive system
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作者 Zhao Lijun Wang Ying +2 位作者 Wei Yuying Liu Qinghe Yin Chengshun 《High Technology Letters》 EI CAS 2017年第4期360-366,共7页
Engine-variable pump-variable motor drive system is a complex nonlinear system. In order to improve system response speed and stability,a sliding-mode variable-structure control based on a feedback linearization theor... Engine-variable pump-variable motor drive system is a complex nonlinear system. In order to improve system response speed and stability,a sliding-mode variable-structure control based on a feedback linearization theory is analyzed in this research. A standardized system model is established and linearized by the feedback linearization theory,and the input dimension is reduced through the relationship between variables which has simplified the linearization process. Then the sliding-mode controller using an exponential reaching law is designed and the Lyapunov stability of this algorithm is verified. The simulation results show that the sliding-mode variable-structure controller based on the feedback linearization theory can improve system response speed,reduce overshoot and achieve stronger robustness,so the vehicle speed control requirements can be satisfied well. 展开更多
关键词 feedback linearization sliding mode control exponential approach law ROBUSTNESS
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Position Control of a Series Elastic Actuator Based on Global Sliding Mode Controller Design 被引量:1
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作者 Wei Yin Lei Sun +1 位作者 Meng Wang Jingtai Liu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2019年第3期850-858,共9页
A series elastic actuator(SEA) is a powerful device in the area of human-machine integration, but it still suffers from difficult position control issues. Therefore, in this paper,an efficient approach is proposed to ... A series elastic actuator(SEA) is a powerful device in the area of human-machine integration, but it still suffers from difficult position control issues. Therefore, in this paper,an efficient approach is proposed to solve this problem. The approach design is divided into two steps: feedback linearization(FL) and global sliding mode(GSM) controller design. The bounded analysis is presented and global asymptotic convergence is analytically proven. Simulation and experiment results illustrate the effectiveness of the proposed scheme. 展开更多
关键词 feedback LINEARIZATION (FL) global SLIDING mode (GSM) position control SERIES ELASTIC ACTUATOR (SEA)
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Coordinated Control of Sliding Mode and Hamiltonian for PWM Rectifier
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作者 LI Lian-qiang GAO Jun-wei 《International Journal of Plant Engineering and Management》 2018年第1期44-52,共9页
Aiming at the PWM rectifier control strategy of sliding mode control, steady state performance weak Hamiltonian control dynamic tracking performance is poor, the coordinated compound control is proposed, the feedback ... Aiming at the PWM rectifier control strategy of sliding mode control, steady state performance weak Hamiltonian control dynamic tracking performance is poor, the coordinated compound control is proposed, the feedback linearization controller and sliding mode controller Hamiltonian system is obtained, and the design of a coordinated control strategy. In order to verify the accuracy of this method, MATLAB/Simulink is used for simulation analysis. The simulation results show that the composite control can achieve the coordinated dynamic rapid tracking and constant DC output and unit power factor operation, and satisfy the control requirements of the rectifier, effectively reducing the disturbance effect on the system. Compared with Hamiltonian control, the proposed method combines the advantages of the two methods, which have the fast tracking performance and excellent steady-state characteristics, and the research prospect is broad. 展开更多
关键词 PWM rectifier Hamiltonian control sliding mode variable structure feedback linearization coordinated control
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Sensor fault-tolerant observer applied in UAV anti-skid braking control under control input constraint 被引量:1
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作者 Hui Sun Jianguo Yan +1 位作者 Yaohong Qu Jie Ren 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2017年第1期126-136,共11页
This paper proposes a method for addressing the problem of sensor fault-tolerant control (FTC) for anti-skid braking systems (ABSs). When the wheel velocity sensor of the ABS for unmanned aerial vehicles (UAVs) become... This paper proposes a method for addressing the problem of sensor fault-tolerant control (FTC) for anti-skid braking systems (ABSs). When the wheel velocity sensor of the ABS for unmanned aerial vehicles (UAVs) becomes faulty, wheel velocity failure and feedback instability may occur. Firstly, a fault diagnosis and isolation (FDI) method based on a sliding mode observer approach is introduced to detect and isolate the fault of the sensor. When the wheel velocity sensor is in healthy conditions, the observer works in a diagnosis mode. If faults occur in the sensor, it acts as a wheel velocity estimator. Secondly, an FTC strategy, adopting a feedback compensation structure, is designed with input control constraints. In addition, based on the FDI result, a terminal sliding mode (TSM) controller is designed to guarantee that slip-ratio tracks its appropriate reference values in situations where runways change conditions during landing. The control system switches automatically from control using a wheel velocity sensor to sensorless control mode, so the observer-based FTC scheme is established. It is logical that the ABS keeps observed-state and remains stable when the wheel velocity sensor is broken and during external disturbance. Finally, simulation results show the effectiveness of the proposed method. © 1990-2011 Beijing Institute of Aerospace Information. 展开更多
关键词 BRAKING control systems Failure analysis Fault tolerance feedback Sensorless control Sliding mode control Unmanned aerial vehicles (UAV) Velocity WHEELS
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提高系统暂态稳定性的VSC-HVDC有功无功联合附加控制策略 被引量:1
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作者 姜惠兰 肖瑞 《电力自动化设备》 EI CSCD 北大核心 2024年第8期138-144,共7页
依据基于电压源型换流器的高压直流输电(VSC-HVDC)对系统暂态稳定性的影响机理,提出一种提高系统暂态稳定性的VSC-HVDC有功无功联合附加控制策略。从VSC-HVDC功率特性与系统等值功角的关系出发,建立含VSC-HVDC有功无功附加量的交直流混... 依据基于电压源型换流器的高压直流输电(VSC-HVDC)对系统暂态稳定性的影响机理,提出一种提高系统暂态稳定性的VSC-HVDC有功无功联合附加控制策略。从VSC-HVDC功率特性与系统等值功角的关系出发,建立含VSC-HVDC有功无功附加量的交直流混联系统暂态稳定分析数学模型。针对数学模型的非线性,采用精确反馈线性化进行坐标变换,并采用滑模控制利用反映系统暂态特征的等值功角变化速度与加速度设计切换面,结合设计的有功无功配合方式,确定了VSC-HVDC有功无功附加量随系统暂态特征量实时调节的控制律,其参数设计与计算过程简便。仿真结果表明所提控制策略充分利用了换流站的功率调节能力,有效降低了系统等值功角首摆幅度,加快系统恢复稳定。 展开更多
关键词 柔性直流输电 暂态稳定性 精确反馈线性化 滑模控制 附加控制
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Transient Stability Improvement of Power System Using Non-Linear Controllers 被引量:1
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作者 Rekha Chaudhary Arun Kumar Singh 《Energy and Power Engineering》 2014年第1期10-16,共7页
This paper presents the design of a non-linear controller to prevent an electric power system losing synchronism after a large sudden fault and to achieve good post fault voltage level. By Direct Feedback Linearizatio... This paper presents the design of a non-linear controller to prevent an electric power system losing synchronism after a large sudden fault and to achieve good post fault voltage level. By Direct Feedback Linearization (DFL) technique robust non-linear excitation controller is designed which will achieve stability enhancement and voltage regulation of power system. By utilizing this technique, there is a possibility of selecting various control loops for a particular application problem. This method plays an important role in control system and power system engineering problem where all relevant variables cannot be directly measured. Simulated results carried out on a single machine infinite bus power system model which shows the enhancement of transient stability regardless of the fault and changes in network parameters. 展开更多
关键词 Single Machine INFINITE Bus (SMIB) Direct feedback LINEARIZATION (DFL) Fuzzy Logic controller (FLC) SLIDING mode control (SMC)
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Two Simple Analog Multiplier Based Linear VCOs Using a Single Current Feedback Op-Amp
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作者 Data Ram Bhaskar Raj Senani +1 位作者 Abdhesh Kumar Singh Shanti Swarup Gupta 《Circuits and Systems》 2010年第1期1-4,共4页
Two simple voltage-controlled-oscillators (VCO) with linear tuning laws employing only a single current feedback operational amplifier (CFOA) in conjunction with two analog multipliers (AM) have been highlighted. The ... Two simple voltage-controlled-oscillators (VCO) with linear tuning laws employing only a single current feedback operational amplifier (CFOA) in conjunction with two analog multipliers (AM) have been highlighted. The workability of the presented VCOs has been demonstrated by experimental results based upon AD844 type CFOAs and AD534 type AMs. 展开更多
关键词 Voltage-controlled Oscillators Current feedback Op-Amps CURRENT-mode CIRCUITS ANALOG MULTIPLIERS
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基于超螺旋二阶滑膜的汽车主动悬架控制方法研究 被引量:1
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作者 周向 文淑容 《机械设计与制造》 北大核心 2024年第1期52-57,共6页
汽车悬架的控制效果直接影响汽车的稳定性和舒适性,针对一阶滑模控制在主动悬架控制中存在的抖振和控制精度问题,基于汽车二自由度1/4主动悬架模型,提出了一种基于超螺旋二阶滑模控制的汽车主动悬架控制方法。在控制器前端串联一个负加... 汽车悬架的控制效果直接影响汽车的稳定性和舒适性,针对一阶滑模控制在主动悬架控制中存在的抖振和控制精度问题,基于汽车二自由度1/4主动悬架模型,提出了一种基于超螺旋二阶滑模控制的汽车主动悬架控制方法。在控制器前端串联一个负加速度反馈回路来调节悬架性能,并使用扩展的超螺旋观测器实时补偿系统的未知内部动态。为了验证控制方法的可行性,通过仿真进行对比分析。仿真结果表明,相比于一阶滑膜控制,该方法解决了悬架未知非线性动态的多目标控制问题,能更有效地改善汽车稳定性和舒适性。 展开更多
关键词 汽车 主动悬架模型 超螺旋二阶滑模控制 负加速度反馈回路 控制策略
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输入饱和的永磁同步风力发电机有限时间滑模控制 被引量:1
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作者 杜明远 孙炜伟 于得海 《太阳能学报》 EI CAS CSCD 北大核心 2024年第1期275-284,共10页
针对永磁同步风力发电机在传统控制方法下存在的控制精度低、抗干扰性能差以及在风能捕获过程由风速快速变化引起较大的控制输入量从而产生饱和约束等问题,基于输入输出反馈线性化(IOFL)方法,结合有限时间(FT)理论与滑模控制(SMC)为输... 针对永磁同步风力发电机在传统控制方法下存在的控制精度低、抗干扰性能差以及在风能捕获过程由风速快速变化引起较大的控制输入量从而产生饱和约束等问题,基于输入输出反馈线性化(IOFL)方法,结合有限时间(FT)理论与滑模控制(SMC)为输入饱和的PMSG设计一种有限时间滑模控制器(FT-SMC)。首先,引入IOFL来提高系统控制精度,在其基础上设计FT-SMC来增强系统的鲁棒性能;然后,在FT-SMC中引入抗饱和补偿器(ATC)解决系统中输入饱和引起的控制稳定性问题;然后,利用Lyapunov稳定性理论分析闭环系统的稳定性,保证系统在有限时间内能够快速跟踪且稳定运行。最后,在Matlab/Simulink仿真实验和半实物仿真平台上进一步验证所设计控制器的有效性和对系统转速的跟踪性能,实验结果表明FT-SMC具有控制精度高、响应速度快、抗干扰能力强等优点。 展开更多
关键词 风力发电机 滑模变结构控制 反馈线性化 抗饱和补偿器 有限时间
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一种新型3-RRPU并联机构的运动学及鲁棒控制研究
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作者 韩秀英 李旭莹 +1 位作者 凌金博 杨琨 《机电工程》 CAS 北大核心 2024年第8期1464-1471,共8页
针对现有的三平移并联机构大多正解不唯一、较难实现精确稳定运动控制的问题,提出了一种新的3-RRPU型三平移并联机构,同时研究了机构的运动学、动力学及轨迹跟踪控制方法。首先,运用螺旋理论分析了该机构三平移的原理,进行了驱动输入的... 针对现有的三平移并联机构大多正解不唯一、较难实现精确稳定运动控制的问题,提出了一种新的3-RRPU型三平移并联机构,同时研究了机构的运动学、动力学及轨迹跟踪控制方法。首先,运用螺旋理论分析了该机构三平移的原理,进行了驱动输入的选取与论证,对机构平台奇异性、驱动奇异性和支链奇异性进行了分析;其次,运用运动学理论建立了运动学模型,推导了位置正、逆解析解;再次,运用拉格朗日动力学理论建立了机构操作空间的刚体动力学模型;最后,提出了一种基于非线性反馈解耦的自适应滑模轨迹跟踪控制方法,以证明其控制稳定性,并基于动力学模型对空间轨迹跟踪精度和控制力矩进行了仿真分析。研究结果表明:3-RRPU并联机构的位置正解在一般位形下具有唯一性,机构的平台奇异位形和驱动奇异位形少且无支链奇异。该轨迹控制方法可使机构在载荷20 kg、速度0.18 m/s、加速度0.12 m/s 2下,实现0.002 m以内的高精度复杂轨迹跟踪;基于Sigmoid函数的轨迹控制方法还能有效削弱控制力矩的抖振,为实现工业领域高速、高精度、高性能的三平移运动提供了新方法。 展开更多
关键词 三平移并联机构 位置正解 奇异性 螺旋理论 非线性反馈解耦 自适应滑模轨迹跟踪控制方法 机构操作空间
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基于模糊控制的PWM整流器电压调速策略 被引量:2
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作者 黄自鑫 汪伟 王乐君 《深圳大学学报(理工版)》 CSCD 北大核心 2024年第1期101-107,共7页
针对三相脉宽调制(pulse width modulation,PWM)整流器控制系统的直流侧电压响应速率问题,提出一种基于模糊控制的电压快速响应控制策略.建立PWM整流器在qd坐标系下的数学模型,并进行欠驱动特性分析和控制策略研究,设计级联双闭环控制结... 针对三相脉宽调制(pulse width modulation,PWM)整流器控制系统的直流侧电压响应速率问题,提出一种基于模糊控制的电压快速响应控制策略.建立PWM整流器在qd坐标系下的数学模型,并进行欠驱动特性分析和控制策略研究,设计级联双闭环控制结构.利用部分反馈线性化策略,设计电流内环控制器,为提升直流侧电压响应速度,提出电压外环模糊控制策略.所提控制策略能够在0.05 s实现稳定,功率因数达到了0.99,提升了系统抗扰动能力,仿真结果证明了所设计控制方案的有效性. 展开更多
关键词 控制理论 脉宽调制整流器 欠驱动特性 双闭环控制 反馈线性化 模糊控制 滑模控制
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无刷直流电机短反馈分数阶PID滑模的优化控制
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作者 郭志坚 于少娟 《兵器装备工程学报》 CAS CSCD 北大核心 2024年第9期291-299,共9页
针对无刷直流电机(BLDCM)的非线性、强耦合、多变量及参数时变等特性,导致其调速系统的控制性能欠佳的问题,提出了一种灰色预测短反馈分数阶PID滑模优化控制算法。引入内分泌激素调节中的超短反馈算法构成系统双层反馈机制,补偿自身的... 针对无刷直流电机(BLDCM)的非线性、强耦合、多变量及参数时变等特性,导致其调速系统的控制性能欠佳的问题,提出了一种灰色预测短反馈分数阶PID滑模优化控制算法。引入内分泌激素调节中的超短反馈算法构成系统双层反馈机制,补偿自身的输出信号;系统反馈环节,引入GM(1,1)模型灰色预测,用灰色预测值取代测量值进行超前控制运算。针对分数阶PID型滑模趋近律参数,采用了一种改进蜣螂优化算法进行寻优,实现更加精确的控制。仿真模拟对比实验结果表明,经蜣螂算法优化的灰色预测短反馈分数阶PID滑模控制下的无刷直流电机调速控制系统,具有比常规PID控制更出色的响应速度、控制精度和鲁棒性等性能。 展开更多
关键词 无刷直流电机 灰色预测 分数阶控制 滑模控制 超短反馈算法 改进蜣螂算法
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不确定非线性系统的自适应滑模区域到达控制
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作者 孙晓明 马辛 +2 位作者 刘烨 周悦 邢博闻 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2024年第8期2482-2491,共10页
针对一类参数严格反馈型不确定非线性系统,考虑存在外界干扰的情况下,设计一种基于反推方法的自适应滑模区域到达控制器,提高系统对非匹配不确定性及未知干扰的鲁棒性。与传统的设定点控制或位置控制不同,区域到达算法的控制目标是一个... 针对一类参数严格反馈型不确定非线性系统,考虑存在外界干扰的情况下,设计一种基于反推方法的自适应滑模区域到达控制器,提高系统对非匹配不确定性及未知干扰的鲁棒性。与传统的设定点控制或位置控制不同,区域到达算法的控制目标是一个以期望点为中心的目标区域。所设计控制器综合了人工势场法、自适应控制、反推技术、滑模控制和Lyapunov方法。利用人工势场法设计目标势能函数,将区域误差引入势能函数中,结合Lyapunov方法,可以实现对目标区域的到达跟踪控制。采用基于反推的区域控制思想,将高阶整体模型分解为低阶子系统,并分别设计相应的滑模面,同时在前n-1步中结合自适应律,能够在线估计非线性系统的不确定参数项,增加所设计控制器的适用性。基于Lyapunov理论证明闭环系统的全局渐近稳定性,仿真结果表明:所设计控制器有效。 展开更多
关键词 严格反馈 区域到达控制 人工势场 自适应控制 滑模控制
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Application of output feedback sliding mode control to active flutter suppression of two-dimensional airfoil 被引量:5
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作者 YANG Chao,SONG Chen,WU ZhiGang & XIE ChangChuan School of Aeronautic Science and Engineering,Beijing University of Aeronautics & Astronautics,Beijing 100191,China 《Science China(Technological Sciences)》 SCIE EI CAS 2010年第5期1338-1348,共11页
The effectiveness of the sliding mode control(SMC) method for active flutter suppression(AFS) and the issues concerning control system discretization and control input constraints were studied using a typical two-dime... The effectiveness of the sliding mode control(SMC) method for active flutter suppression(AFS) and the issues concerning control system discretization and control input constraints were studied using a typical two-dimensional airfoil.The airfoil has a trailing-edge flap for flutter control.The aeroelastic system involves a two-degrees-of-freedom motion(pitch and plunge),and the equations were constructed by utilizing quasi-steady aerodynamic forces.The control system,designed by the output feedback SMC method,was incorporated to suppress the pitch-plunge flutter.Meanwhile,the system discretization and the flap deflection constraints were implemented.Then,a classical Runge-Kutta(RK) algorithm was utilized for numerical calculations.The results indicated that the close-loop system with the SMC system could be stable at a speed above the flutter boundary.However,when the flap deflection limits are reached,the close-loop system with the simple discretized control system loses control.Furthermore,control compensation developed by theoretical analysis was proposed to make the system stable again.The parameter perturbations and the time delay effects were also discussed in this paper. 展开更多
关键词 aeroelasticity FLUTTER AIRFOIL SLIDING mode control output feedback control
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