机载雷达伺服系统模型参考自适应控制的设计与实现

推导了信号综合模型参考自适应律。进行了计算机系统仿真：确定自适应参数，在满足Ｌｉａｐｕｎｏｖ稳定理论的基础上，对自适应机构进行简化以便于工程实现，并对该自适应系统进行了鲁棒性分析。最后，这种自适应控制系统被用于机载雷达伺服速度回路中，并取得了满意的结果。     

基于模型参考自适应系统的感应电机控制

采用模型参考自适应法设计了无速度传感器矢量观测器。现以电压模型为参考模型,电流模型为可调模型,推算出速度信息,计算输出控制信号,实现了对感应电机的精确控制;通过Matlab／Simulink对其进行仿真、验证,结果表明,该系统对定子磁链观测精度高,速度估计准确,改善了电机的控制特性。     

基于跟踪微分器的模型参考自适应控制

为了处理二阶系统模型参数的大范围不确定性,提出了基于跟踪微分器的模型参考自适应控制,利用两个非线性跟踪微分器分别得到系统输出的微分信号和误差的微分信号,同时抑制了高频噪声放大效应。根据被控对象的数学模型,自适应调节律能自动实时调节控制律中的参数。实验结果表明,当雷达伺服系统被控对象模型的参数在较大范围内变化时,该新型控制器有效补偿了二阶系统参数的不确定性,提高了伺服系统稳态和动态跟踪精度,保证了系统的全局渐近稳定。     

Model Reference Adaptive Control Based on Adjustable Reference Model during Mode Transition for Hybrid Electric Vehicles

Hybrid elective vehicles (HEVs) operate in multiple driving modes, e.g., motor driving mode, engine driving mode, and combined driving mode, under various different scenarios. Therefore, mode transition between different driving modes is necessary to ensure high-efficiency operation of HEVs under various running conditions. This paper proposes adjustable reference model (ARM)-based model reference adaptive control (MRAC) to solve the problems of deviation from driver's intention and lack of adaptability to parameter changes. The driveline dynamics model during mode transition is built and validated. The dynamics in the mode before the mode transition is taken as the reference model whose parameters are estimated online. Thereafter, the adaptive law is derived. Simulation and hardware-in-loop experiments are carried out. The results show that the mode transition performance under varying driver's demand torque is satisfactory in terms of not only vehicle jerk, but also clutch slipping time and frictional loss. And, the controller has good adaptability to different vehicle masses and road slopes. The ability to deal with the disturbance in clutch torque with low frequency is also validated.     

基于神经网络的模型参考自适应控制

将神经网络应用于模型参考自适应控制系统中,组成模型参考神经网络自适应控制系统.利用神经网络自身的优点来克服传统模型参考自适应控制算法的不足,使系统具有更强的鲁棒性和容错性.仿真结果表明,该系统与传统的模型参考自适应控制系统比较,不仅能实现原系统的功能,而且该系统的稳定性和抗干扰性优于原系统.     

可重构飞行控制系统的滑模自适应控制律设计

当飞行控制系统操纵面发生损伤故障时,结合自适应思想,采用滑模控制方法进行重构飞行控制系统的设计.采用单位向量法设计滑模控制器,这种控制器由线性部分和非线性部分组成.线性部分采用改进的线性二次型最优控制器法进行计算,而非线性部分采用自适应增益来更好地适应故障情况.利用某型飞机的纵向飞行控制系统模型进行仿真,结果表明,带有自适应增益的滑模控制方法不仅适合于正常情况下的飞控系统设计,而且对操纵面损伤故障情况具有较强的适应能力,与固定增益情况相比,具有更好的跟踪效果和重构控制效果.     

An Implementation of an Adaptive Control Algorithm for a Three-Phase Shunt Active Filter

This paper deals with the hardware implementation of a shunt active filter (SAF) for compensation of reactive power, unbalanced loading, and harmonic currents. SAF is controlled using an adaptive-linear-element (Adaline)-based current estimator to maintain sinusoidal and unity-power-factor source currents. Three-phase load currents are sensed, and using least mean square (LMS) algorithm-based Adaline, online calculation of weights is performed and these weights are multiplied by the unit vector templates, which give the fundamental-frequency real component of load currents. The dc bus voltage of voltage source converter (VSC) working as a SAF is maintained at constant value using a proportional–integral controller. The switching of VSC is performed using hysteresis-based pulsewidth-modulation indirect-current-control scheme, which controls the source currents to follow the derived reference source currents. The practical implementation of the SAF is realized using dSPACE DS1104 R&D controller having TMS320F240 as a slave DSP. The MATLAB-based simulation results and implementation results are presented to demonstrate the effectiveness of the SAF with Adaline-based control for load compensation.      

基于自适应高阶补偿CMOS带隙基准源的设计

文章利用线性分段补偿的基本原理,依据输出支路内部的温度负反馈结构,引入了一种结构新颖简单、适应不同开口方向的电压基准高阶补偿方法.基于该补偿方法,设计了一款高精度的电压基准电路,根据温度补偿原理合理确定各器件参数,包括电压电流大小、电阻等参数;在这基础上用Cadence Sepctre进行仿真（本设计采用CSMC 0....     

模型参考自适应控制逆变器的研究

分析了模型参考自自就控制方法应用于逆变器控制的可行性,提出了一种控制方案。详细地分析了系统的工作原理,得出了仿真结果及相应的数字解释。结果表明,这是一种控制效果好的方案。     

A Decentralized Model Reference Adaptive Controller for Large-Scale Systems

A decentralized model reference adaptive controller (MRAC) for a class of large-scale systems with unmatched interconnections is developed in this paper. A novel reference model is proposed for the class of large-scale systems considered and a decentralized, full-state feedback adaptive controller is developed for each subsystem of the large-scale system. It is shown that with the proposed decentralized adaptive controller, the states of the subsystems can asymptotically track the desired reference trajectories. To substantiate the performance of the proposed controller, a large web processing line, which mimics most of the features of an industrial web process line, is considered for experimental study. Extensive experiments were conducted with the proposed decentralized adaptive controller and an often used decentralized industrial proportional-integral (PI) controller. A representative sample of the comparative experimental results is shown and discussed     

周期性参考信号的跟踪控制系统设计及应用

本文提出了一种在参考信号具有周期性或重复性特点时,设计跟踪控制系统的新方法。根据重复控制理论设计重复控制器,使系统的输出跟踪输入的周期性或重复性参考信号,从而达到跟踪控制的目的。重复控制器由重复补偿器和稳定化补偿器组成。文中对控制器的设计进行了详细的讨论,给出了设计实例和仿真结果。研究表明,应用这种方法设计的电液伺服振动台系统可以实现对周期或重复性的振动实验信号的跟踪控制。     

基于模型参考的直线伺服系统离散滑模控制

针对永磁直线同步电机伺服系统存在的诸多不确定性问题,设计了模型参考离散滑模（MRDSMC）位置跟踪控制器。将伺服问题转化为调节问题,为了保证跟踪的快速性,在传统DSMC滑模面的基础上,引入遗忘因子。并采用一步延迟扰动近似来补偿未知扰动。此外,为了抑制由高频未建模动态引起的抖振,在MRDSMC设计中加入低通滤波器。仿真结果表明,该方案能有效地抑制系统未建模动特性的影响,具有很强的鲁棒跟踪性能。     

基于Hopfield网络的PID模型参考自适应控制的研究与仿真

为了得到较好的PID模型的控制效果,提出一种有效的控制方案.阐述PID控制技术的定义与Hopfield网络的基本原理.结合PID控制的特点,构造了基于Hopfield网络的PID模型参考自适应控制算法.利用Hopfield网络对控制器进行优化,得出优化后系统的相应参数.通过Matlab软件对构造的系统模型进行仿真.仿真结果表明,该算法实现简便,具有较好的实时性、稳定性和鲁棒性,对被控对象的控制效果比较理想.     

Model Reference Adaptive System Against Rotor Resistance Variation in Induction Motor Drive

The paper deals with a compensation method of the rotor-resistance variation in induction motor drives using high-performance slip-frequency control. Our proposed method is based on a discrete-type model reference adaptive system (MRAS), and it is implemented in an 8086 microprocessor. When an induction motor is driven by a controlled current source, the system sensitivity to the rotor resistance variation is increased. In the MRAS, the value of the rotor resistance is estimated and the slip-frequency gain is adjusted. Experimental and numerical results show that even if the value of the rotor resistance varies from its nominal value, the secondary flux level is maintained constant by using this compensation method. These results point out the validity of our proposed method.     

压电超材料主动控制分流电路设计

为进一步优化压电声学超材料分流电路设计,提出了一种基于零极点配置的主动控制电路,总结出零极点配置的一般规律,直接通过调节零点和极点设计相关传递函数,并利用微控制器加以实现。由于数字控制器能够利用计算机进行远程控制,因此可以更灵活地调节超材料带隙。该方法降低了模拟电路的复杂度,摆脱了模拟电路需要手动调整参数的限制,为超材料的智能控制提供了新的思路,更便于实际应用。实验结果表明,压电超材料在低频模态范围内均有超过14 dB的衰减,由此证明了结构所用主动控制电路的有效性。     

精密机械结构的自适应压电分流阻尼抑振

为提高压电分流阻尼系统对多模态振动的抑制能力,提出了一种基于负阻抗变换器的频率自适应模拟电感电路.并应用于压电分流电路的设计,使压电分流电路能适应结构振动频率的变化而一直处于谐振状态,从而达到最佳的阻尼抑振效果,并研究了分流电路构型和各元件阻抗对抑振效果的影响.将此电路应用于典型精密机械结构--硬盘驱动器磁头驱动臂的多模态振动响应抑制,取得了良好的抑振效果,结构的前3阶稳态响应传递函数的幅值分别降低了8.15 dB、12.06 dB和2.11 dB.     

Multiple Model Adaptive Control Procedure for Blood Pressure Control

Multiple model adaptive control procedures have been considered for a computer-based feedback system which regulates the infusion rate of a drug (nitroprusside) in order to maintain desired blood pressure. Because the transfer function parameters are different for each patient, and furthermore are time variant, such an algorithm is desirable for maintaining both steady-state and transient specifications. To this effect, computer simulation has shown that multiple model adaptive control procedures might be successfully applied to the control of blood pressure despite the uncertainty in the delays, time constant, and gains. Additional efforts concerned with the actual demonstration of these concepts on dogs have further supported the role of adaptive control for blood pressure regulation.     

一阶线性时滞系统的内模控制设计

内模控制是近年来发展起来的一种新型控制方法,分析它的原理对于工程应用和理论研究具有重要的意义。从IMC结构分析入手揭示了内模控制的本质,证明了该系统可实现对阶跃信号的无差跟踪及在阶跃信号扰动下可实现无差控制;介绍了时滞线性系统内模控制器和内模滤波器的设计方法。并基于MATLAB仿真研究表明,线性时滞过程的内模控制具有较好的鲁棒性,有一定的应用价值。     

用于GaN生长的生产型MOCVD设备控制系统设计

MOCVD法外延生长GaN基材料作为新世纪的核心技术之一受到全世界的高度重视。MOCVD技术涉及面广,控制对象复杂,且对控制对象的精度、重复性、可靠性要求较高。主要介绍了用于GaN基材料生长的生产型MOCVD(2″×6)设备控制系统的组成与特点。设备运行一年来的结果表明,该系统可靠性高、抗干扰性好、运行效果良好。     

多模型自适应控制的模型切换算法研究

针对非线性时变系统在自适应控制过程中瞬态响应差的问题,提出了一种基于多模型自适应控制的模型切换算法.首先,在多模型框架下,通过在模型切换中使Lyapunov函数产生最大的负跳变而选择辨识模型,同时重置参数;其次,通过Lyapunov方法分析了整个系统的闭环稳定性;最后,通过一个仿真实验,表明该算法可以有效地提高系统的瞬态响应性能.