Unpower aerocraft augmented state feedback tracking guaranteed cost control

Aimed at designing the unpower aerocraft attitude control system in a simple and practical way, the guaranteed cost control is adopted. To eliminate the steady-error, a novel tracking control approach--augmented state feedback tracking guaranteed cost control is proposed. Firstly, the unpower aerocraft is modeled as a linear system with norm bounded parameter uncertain, then the linear matrix inequality based state feedback guaranteed cost control law is combined with the augmented state feedback tracking control from a new point of view. The sufficient condition of the existence of the augmented state feedback tracking guaranteed cost control is derived and converted to the feasible problem of the linear matrix inequality. Finally, the proposed approach is applied to a specified unpower aerocraft. The six dimensions of freedom simulation results show that the proposed approach is effective and feasible.     

带有持续扰动非线性系统的最优跟踪控制

研究具有外界持续扰动的非线性系统的无静差最优跟踪控制问题。首先基于内模原理构造一扰动补偿器,将系统化为无扰动的增广系统。然后利用灵敏度法推导出了该系统的最优跟踪控制律。仿真实例表明了该设计方法的有效性。     

具有性能预设的多机编队目标跟踪控制

针对无人机编队目标跟踪中性能不可控的问题,提出了一种具有性能预设的分布式多机编队目标跟踪控制方法.首先提出一种基于运动参数组的编队队形描述与目标跟踪方法,实现了编队的相位预设与队形控制;其次利用误差变换方法将有性能约束的误差问题转换为无约束误差控制问题,并给出了一致性预设性能控制律;然后分别设计了指数型和预设时间型性能...     

智能决策系统及其在飞控系统设计中的应用

为使飞控系统的设计更加省时省力,将智能决策支持系统引入到飞控系统中。通过智能决策系统来管理飞机的数据库、模型库、控制方法等,并在知识库中应用智能算法来决策飞机的最优控制规律。在智能决策算法的开发中,采用基于踏脚石迁移模型的分布式遗传算法,将种群划分为若干子群,各子群并行地进行遗传进化,并通过迁移算子进行各子群的信息互换;在编码过程中,采用伪码与实码相互转换的编码方式,大大减少了编码的工作量。仿真结果表明,基于踏脚石迁移模型的分布式遗传决策算法能快速并有效地应用于控制系统设计中。     

Intelligent coordinated control of power-plant main steam pressure and power output

An intelligent coordinated control strategy has been proposed and successfully applied to a 300MW boiler-turbine unit i. e. Unit 1 of Yuanbaoshan power plant in China. Load following operation of coal-fired boiler-turbine unit in the power plant leads to changes in operating points which result in nonlinear variations of the plant variables and parameters. For the variation of operating condition and slowly varying dynamics, an intelligent control scheme has been developed by combining fuzzy self-tuning with adaptive control and auto-tuning techniques. As there exist strong couplings between control loops of main steam pressure and power output in the unit, a new design for static decoupler aimed at decoupling for setpoints and unmeasured pulverized coal disturbance of the system at the same time is presented. Satisfactory industrial application results show that such a control system has enhanced adaptability and robustness to the complex process, and better control performance and high economic benefi     

多机载平台多目标跟踪与辐射控制

针对作战飞机编队多目标跟踪中的辐射控制问题,提出了一种多机多传感器协同多目标跟踪与辐射控制方法。该方法首先根据目标与我机编队之间的距离,利用模糊逻辑设定不同目标的跟踪精度,然后以目标跟踪精度为任务需求,在时间上控制雷达辐射。建立了目标的威胁评估模型,并根据目标相对我机的不同威胁度在空间上控制雷达辐射,选择威胁度最小的一个或几个雷达辐射。同时,利用多平台间的机载地理坐标系转换,进行多平台序贯滤波,实现传感器管理下的目标跟踪。仿真结果证明了方法的合理性和有效性,研究结论有助于提高作战飞机编队的抗侦察和抗干扰能力,从而提升整体的生存能力。     

Reference tracking control for flexible air-breathing hypersonic vehicle with actuator delay and uncertainty

This paper considers the problem of reference tracking control for the flexible air-breathing hypersonic flight vehicle with actuator delay and uncertainty.By constructing the Lyapunov functional including the lower and upper bounds of the time-varying delay,the non-fragile controller is designed such that the resulting closed-loop system is asymptotically stable and satisfies a prescribed performance cost index.The simulation results are given to show the effectiveness of the proposed control method,which is validated by excellent output reference altitude and velocity tracking performance.     

Optimal tracking control for linear time-delay large-scale systems with persistent disturbances

An optimal tracking control (OTC) problem for linear time-delay large-scale systems affected by external persistent disturbances is investigated. Based on the internal model principle, a disturbance compensator is constructed. The system with persistent disturbances is transformed into an augmented system without persistent disturbances. The original OTC problem of linear time-delay system is transformed into a sequence of linear twopoint boundary value (TPBV) problems by introducing a sensitivity parameter and expanding Maclaurin series around it. By solving an OTC law of the augmented system, the OTC law of the original system is obtained. A numerical simulation is provided to illustrate the effectiveness of the proposed method.     

带有初始误差的机械手轨迹跟踪的快速迭代学习控制

针对具有非零初始误差的多关节机械手的轨迹跟踪控制问题,首先采用降阶变换的方式将原系统转化为低阶系统,再对低阶系统重新变换设计,该方法消除了Kawamura方法在学习过程中要求每次学习初态与期望初态一致或迭代初态固定的限制.然后提出一种新型快速迭代算法对变换后的机械手系统模型进行学习控制,充分利用了系统已存的有效信息,使系统的输出能尽快地收敛于期望轨迹.该算法相对于P型算法具有较快的跟踪收敛速度,相对于PD型算法计算过程简便易行,避免了微分运算给系统带来的不稳定影响.仿真结果表明了所提控制方案的有效性,提高了系统的实时性.     

Linear chaos in the quantum harmonic oscillator

In this note,it is proved that for the annihilation operator B of the unforced quantum harmonic oscillator,B~n is mixing and generically 5-chaotic with any 0 δ 2 for each positive integer n.Besides,by using the result in[Wu X and Zhu P,J.Phys.A：Math.Theor.,2011,44：505101],the authors obtain that the principal measure of B~n is equal to 1 for each positive integer n.     

Finite-time tracking control for motor servo systems with unknown dead-zones

A finite-time tracking control scheme is proposed in this paper based on the terminal slid- ing mode principle for motor servo systems with unknown nonlinear dead-zone inputs. By using the differential mean value theorem, the dead-zone is represented as a time-varying system and thus the inverse compensation approach is avoided. Then, an indirect terminal sliding mode control （ITSMC） is developed to guarantee the finite-time convergence of the tracking error and to overcome the singu- larity problem in the traditional terminal sliding mode control. In the proposed controller design, the unknown nonlinearity of the system is approximated by a simple sigmoid neural network, and the ap- proximation error is diminished by employing a robust term. Comparative experiments on a turntable servo system are conducted to show the superior performance of the proposed method.     

Coullet系统异结构线性反馈混沌同步

用形式为x|x|非线性函数取代Coullet系统中的立方非线性函数得到变形Coullet系统。分析二系统的特性,发现变形Coullet系统与原Coullet混沌系统具有拓扑共轭关系。采用线性反馈方法实现了二个拓扑共轭异结构系统之间的混沌同步,根据Hurwitz稳定性判据,得到反馈控制增益k的理论值。设计了实现Coullet系统异结构线性反馈混沌同步的实验电路,并通过实验对理论分析进行验证,结果表明理论分析的正确性。     

Digital implementation and analysis of a high dynamic frequency tracking loop

In the wireless guidance system,the signals that receiver received has obvious Doppler shift for the high dynamic characteristic of the carrier.A new solution of carrier frequency tracking loop with frequency modifying system is put forward.The characteristic of cross product auto frequency control and the second order loop filter in this loop are analyzed.The simulation shows that this loop can accomplish frequency tracking well in high dynamic circumstance.     

Best tracking performance for integrator and dead time plant

The optimal tracking performance for integrator and dead time plant in the case where plant uncertainty and control energy constraints axe to be considered jointly is inrestigated.Firstly,an average cost function of the tracking error and the plant input energy over a class of stochastic model errors are defined.Then,we obtain an internal model controller design method that minimizes the average performance and further studies optimal tracking performance for integrator and dead time plant in the simultaneous presence of plant uncertainty and control energy constraint.The results can be used to evaluate optimal tracking performance and control energy in practical designs.     

海流扰动下无人水下航行器的动态面反演轨迹跟踪控制

针对存在未知海流扰动条件下无人水下航行器(unmanned underwater vehicle,UUV)的轨迹跟踪控制问题,提出一种欠驱动UUV的动态面反演轨迹跟踪控制方法.首先,设计一种改进型海流扰动观测器来估测航行器动力学模型中存在的未知海流扰动.然后,采用反演法并结合动态面控制技术设计三维轨迹跟踪控制器,将控制...     

BOOST变换器中混沌现象及其控制的仿真研究

分析了工作在电流断续状态下BOOST变换器的离散迭代模型,对该迭代模型的分岔现象进行了仿真研究。基于MATLAB的POWER SYSTEM工具箱,采用基于器件模型的仿真研究证实了该变换器中的混沌现象。针对该混沌现象采用了跟踪控制方法进行控制,该方法消除了变换器中的混沌现象,使变换器工作在周期1状态,基于迭代模型和器件模型的仿真结果表明了混沌现象的存在和所提控制方法的有效性。     

Intelligent vehicle lateral controller design based on genetic algorithmand T-S fuzzy-neural network

1.INTRODUCTION Effectivelateralcontrolisthepremiseofintelligent vehicle(IV)tracking.However,duetothenon lin earityandparameterstime variety,thelateralcon trollerdesignisadifficulttask.Manyworkshad beendoneforvehiclelateralcontrollerdesign.Ref.[1]usingstandardlinearquadraticcontrolapproach,Ref.[2]usingsliding modelapproach,Refs.[3～5]usingH infinityapproach,Ref.[6]usingnonlinear gain optimizedapproach,Refs.[7,8]usingfuzzy logicalapproach,studythelateralcontrolproblem,respectively.Refere…     

变型蔡氏电路混沌同步的非线性反馈控制

混沌同步是实施混沌保密通讯的基础,非线性反馈是实现混沌同步的重要方法。蔡氏混沌电路及变型蔡氏混沌电路是应用广泛的混沌模型之一。对变型蔡氏电路混沌同步设计了非线性反馈同步控制器;根据Hurwitz稳定性判据得到反馈控制增益的取值范围。基于该方法,构建了实现混沌系统同步控制的实验电路,系统仿真和电路实验结果表明采用非线性反馈控制可以保证实现变型蔡氏电路混沌系统一致指数同步化。     

Adaptive robust control of mobile satellite communication system with disturbance and model uncertainties

The tracking and stable control of a typical shipmounted mobile satellite communication system(MSCS) is studied.Unlike the former studies based on simplified single-axis models,a tri-axis nonlinear model including the kinematic and dynamic features of the MSCS is used as the control object.An adaptive robust controller with trajectory planning is designed to deal with large parametric uncertainties and uncertain nonlinearities of the system.A theoretic performance result is given and proved.The designed adaptive robust controller and other two traditional controllers are tested in the comparative simulations under three different situations.The simulation results show the tracking and stable validity of the proposed controller.     

Genetic algorithmcombined with immune mechanism and its application in skill fuzzy control

1 .INTRODUCTIONSince 1974 , when Mamdany, a British professor ,started applyingfuzzy control theoryto heater controlsystems ,fuzzy control has gradually been appliedto agrowing number of Page 1 of 14 fields .Its character-istics ,such as the effectiveness ,being easy to under-stand by on site operators , being easy to intervene ,and so on, have made fuzzy control a good controlmethod with promising future .However ,fuzzy control still faces alarge numberof long-term problems . The diffic…