共查询到20条相似文献,搜索用时 15 毫秒
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针对直线电机构成的伺服系统中存在的负载扰动和端部效应等阻力扰动,设计了一个自适应的轨迹渐近跟踪控制器;控制律的实现只涉及输出位移的测量信号,而不必依赖于速度的测量;先引入一个基于K滤波器结构的降阶观测器,接着利用自适应观测器后推技术设计了轨迹跟踪控制器和扰动参数估计的自适应律;对闭环系统的稳定性和渐近跟踪能力做了理论分析,并进行了仿真研究;仿真结果表明;设计的控制器可以实现对目标轨迹的渐近跟踪;在系统持续激励的情况下,扰动参数的估计可以收敛到真正的值。 相似文献
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Dailin Zhang Zining Wang Masayoshi Tomizuka 《IEEE/CAA Journal of Automatica Sinica》2020,7(3):693-701
Base on the accurate inverse of a system, the feedforward compensation method can compensate the tracking error of a linear system dramatically. However, many control systems have complex dynamics and their accurate inverses are difficult to obtain. In the paper, a variable parameter model is proposed to describe a system and a multi-step adaptive seeking approach is used to obtain its parameters in real time. Based on the proposed model, a variable-parameter-model-based feedforward compensation method is proposed, and a disturbance observer is used to overcome the influence of the model uncertainty. Theoretical analysis and simulation results show that the variable-parametermodel-based feedforward compensation method can obtain better performance than the traditional feedforward compensation. 相似文献
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直线同步电动机直接牵引力控制及无速度传感器运行研究 总被引:1,自引:0,他引:1
直线电动机在直线传动领域得到越来越广泛的应用。本文以常见的直线同步电动机为例,给出了其基本结构及数学模型,然后阐述了直接牵引力控制的原理及实现时应注意的细节问题,最后讨论了无速度传感器运行的问题。仿真实验表明,直接牵引力控制具有响应迅速,实现简单的特点;基于功角计算的速度观测算法在高速段具有很好的效果。 相似文献
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This paper describes an adaptive control scheme developed for precision control of DC permanent magnet linear motors (PMLM). A sliding surface is defined on which a self‐tuning version of robust control capable of achieving tight set‐point regulation is developed, where the control gains are tuned using an adaptive algorithm. Parameter and states convergence properties of the adaptive controller are derived based on the control law formulated. Finally, simulation study and a real‐time experiment are provided to evaluate the performance of the proposed control system. 相似文献
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热轧带钢层流冷却系统的前馈-反馈控制及其优化 总被引:1,自引:1,他引:0
以热轧层流冷却系统为研究对象,对如何提高带钢卷取温度控制精度进行了研究;在带钢冷却模型的基础上,对预设定模块进行了前馈补偿;考虑模型的不确定性和大时滞特性,采用模糊Smith预估器提高了反馈控制的精度;结果证明所采用的这些措施大大提高了卷取温度的控制精度。 相似文献
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Min‐Shin Chen Shih‐Yu Lin Ming‐Lei Tseng Yi‐Liang Yeh Jia‐Yush Yen 《Asian journal of control》2016,18(3):1135-1141
When there are external disturbances acting on the system, the conventional Luenberger observer design for state estimation usually results in a biased state estimate. This paper presents a robust state and disturbance observer design that gives both accurate state and disturbance estimates in the face of large disturbances. The proposed robust observer is structurally different from the conventional one in the sense that a disturbance estimation term is included in the observer equation. With this disturbance estimation term, the robust observer design problem is skillfully transformed into a disturbance rejection control problem. We then can utilize the standard H∞ control design tools to optimize the robust observer between the disturbance rejection ability and noise immune ability. An important advantage of the proposed robust observer is that it applies to both minimum‐phase systems and non‐minimum phase systems. 相似文献
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Sliding Mode Disturbance Observer‐based Motion Control for a Piezoelectric Actuator‐based Surgical Device 下载免费PDF全文
This paper presents a sliding mode disturbance observer‐based motion tracking control methodology. In particular, the methodology is applied to control a semi‐automated hand‐held ear surgical device for the treatment of otitis media with effusion. The proposed control methodology is utilised to deal with the undesirable effects in the motion system, such as non‐linear dynamics, parametric uncertainties and external disturbances. It employs a proportional‐derivative control scheme together with a sliding mode disturbance observer for rejecting the undesirable effects. The stability of the proposed control methodology is proven theoretically and its effectiveness is evaluated experimentally. In addition, promising motion tracking experimental results are shown, and it can be observed that the proposed approach offers more robust performance for controlling the hand‐held surgical device and other similar instruments. 相似文献
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舵机负载模拟系统的主要任务是对舵机的力矩负载特性、最大承载能力等参数或特性进行检测,但由于这种系统通常是不稳定的发散系统,系统的不稳定特性直接影响舵机的性能检测精度.为克服此类问题对工程应用的不良影响,提出采用微分负反馈方法来解决负载模拟器的发散问题.同时,针对舵机运动速度分量引起的多余力问题,设计了舵机运动速度前馈补偿的控制算法.基于Matlab进行了控制系统仿真验证,对加入补偿算法前后系统对自然正弦指令信号的力矩响应幅值和相位差值进行了对比,分析了加入校正环节对系统误差的改善情况.仿真和实验结果表明,该方法在工程领域常见工况下具有较好的力矩跟踪性能,能够有效地测试舵机的承载性能. 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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针对大型火电机组参与电网调峰调频而常处于变负荷工况运行的特点,传统的PID协调控制策略难于满足系统要求,以某600 MW超临界机组为对象,设计了以"炉跟机"为基础的协调系统的双线性自抗扰控制(LADRC)。利用观测器观测的扩张状态补偿系统內外扰动,针对锅炉侧的迟滞对锅炉LADRC增加了前馈补偿;基于Matlab编写LADRC控制算法,借助该机组的全范围仿真机开展变负荷扰动仿真实验。结果表明,该协调系统LADRC对负荷和主汽压力的抗扰控制效果优于PID控制。该算法整定参数少,易于工程应用。 相似文献
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This paper proposes a new control design to compensate for the residual control error from charge feedback control. A part of the applied voltage is consumed by the hysteresis effect because of the nature of the piezoelectric material; moreover, this effect is difficult to overcome because it is rate dependent. This work utilizes a piezoelectric electromechanical model to propose a precompensation algorithm for a piezoelectric actuator. A nonlinear compensator can be used to treat both the hysteresis nonlinearity and the rate dependency of the system, and the adjustable parameters are specified through adaptive identification with only basic system information. The proposed design can position a piezoelectric stage with a magnifying mechanism within a few nanometers of a target, and the leftover hysteresis phenomenon is negligible. 相似文献
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Synchronization and Tracking Control for Dual‐motor Driving Servo Systems with Friction Compensation
A nonsingular fast terminal sliding mode (NFTSM) controller is designed by incorporating the variable gain neural network (NN) observer, which is utilized to guarantee motor speed synchronization and load position tracking of dual‐motor driving servo systems. By designing the variable gain NN observer, the states and uncertain nonlinearities of servo systems are estimated with fast convergence rate and small steady‐state error, where the effects from external disturbance are suppressed as well. Based on the estimated states, the cross‐coupling synchronization strategy and NFTSM tracking scheme are designed to achieve the rapid speed synchronization and precise load tracking, where the NNs are introduced to approximate and compensate friction nonlinearities. In particular, a novel nonlinear synchronization factor characterizing the degree of speed synchronization is proposed to achieve switching between synchronization control and tracking control, which is proven to deal with the coupling problem of synchronization and tracking. Finally, the comparative simulations and experiments are included to verify the reliability and effectiveness. 相似文献
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Based on extended state observer (ESO), we propose an adaptive robust control (ARC) for a dual motor driving servo system, in which there exist nonlinearities affecting control performance. To apply ESO and estimate the lumped uncertainty online, backlash and friction are analyzed and the nonlinear model of the plant is derived. We achieve several control objectives. First, the bias torque is considered in order to eliminate the effect of backlash. Second, the speed feedback is used to maintain the speed synchronization of motors. Then, to achieve feedforward control, finite‐time ESO is designed to estimate the unknown nonlinearities online. Furthermore, the ESO‐based adaptive robust controller is designed to guarantee L∞ of tracking error by an initialization method, maintaining the transient performance of tracking behavior. Finally, extensive experimental results on a practical test rig validate the effectiveness of our proposed method. 相似文献
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单神经元PID双直线电机同步控制 总被引:3,自引:0,他引:3
本文采用单神经元自适应PID控制方案,将其应用于重型龙门移动式镗铣加工中心双直线电机驱动的轴间反馈回路,以抑制由不同步引起的不平衡扭矩。仿真结果表明,该种控制方案简单、具较好的快速性及无静差、无超调性能,能够较好地满足被控对象对高精度同步控制的要求。 相似文献