Analyses and designs of a nonlinear mechanical scanning control system

In this literature, a scanning system with special mechanical structure and electronic control circuit is analyzed and designed. The scanning control system enlarges the field of view (FOV) and saves more 48% power consumption than conversional scanning systems with scanning motor. The considered system is characterized and analyzed by an equivalent nonlinear feedback control system. All analyzed results are verified by digital simulating and real system testing datum.     

单个控制场下开放量子系统的状态转移(英文)

研究了开放量子系统的状态转移问题.利用刘维尔超算符将其矩阵动力学模型转换为向量形式.给定一个耗散的量子系统的动力学模型,在一个随时变化的外部控制场中,以系统状态和目标状态的密度矩阵的误差平方作为性能指标,推导出改进的状态转移最优控制律.在数值仿真实验中,我们研究了一个热浴中的自旋1/2粒子系统在单个外部控制场作用下的动力学特性.在所提出的最优控制作用下,分别选择本征态、纯态和混合态作为系统的初始状态和目标状态.对此系统中状态转移的实验结果进行了性能对比分析.     

母子公司控制机制选择：知识转移的视角

本文从知识转移的视角,分析了母子公司控制机制和母子公司知识转移程度、方式之间的关系,并进行相应的实证研究,揭示了母子公司控制机制的影响因素和具体应用场合。     

科技发展投资驱动下的一次能源消费最优控制模型

为研究科技发展投资对于一次能源消费控制的驱动作用,首先构建一次能源消费的IPAT模型和经济发展水平的C-D生产函数模型,运用Johansen-Juselius协整检验方法确定IPAT模型和C-D生产函数模型的参数,在此基础上构建基于最优控制理论的一次能源消费最优控制模型,使用该模型获得一次能源消费的最优化路径和科技发展投资的最优控制路径,分析科技发展投资对于一次能源消费的驱动效果。在我国"十三五"期间经济发展约束下,运用该模型研究我国"十三五"期间科技发展投资驱动下的一次能源消费的优化问题,研究结果显示:在科技水平不断提升的前提下,我国一次能源消费量在理论上可以呈现不断降低的理想发展趋势,2020年下降到330 940万t标准煤,同时我国科技发展投资应保持年均26.6%的高速增长,在科技发展的驱动下,我国全社会固定资产投资的GDP占比也可以呈现不断降低的趋势,从而实现科技发展驱动下的集约式发展模式。     

General decay of energy for a viscoelastic equation with nonlinear damping

In this paper, we investigate a nonlinear viscoelastic equation with nonlinear damping. The general uniform decay rate of the energy is established.     

A PI controller configuration for robust control of a class of nonlinear systems

The PI control configuration for stabilization and signal tracking of nonlinear systems is investigated. Semiglobal asymptotic stability and semiglobal practical signal tracking of the controlled system are proven using results from the theory of nonlinear singularly perturbed systems.     

压风机组恒压供风节能控制技术在煤矿中的应用

压风机组恒压供风节能控制技术根据煤矿压风机系统工况的特点,采用可编程控制器、触摸屏、工业计算机、传感器等技术,实现压风系统的恒压供风、远程自动控制、远程可视控制功能,并有效保持了系统内空气压力稳定,调整了整体负载平衡,减少了排气放空,实现节能降耗,提高了监控系统全面有效性,真正实现了无人自动化操作。     

Guaranteed-cost reliable control with regional pole placement of a power system

This paper deals with the simultaneous coordinated design of power system stabilizer (PSS) and the flexible ac transmission systems (FACTS) controller. The problem of guaranteed cost reliable control with regional pole constraint against actuator failures is investigated. The state feedback controllers are designed to guarantee the closed loop system satisfying the desired pole region, thus achieving satisfactory oscillation damping and settling time, and having the guaranteed cost performance simultaneously. The proposed controllers satisfy desired dynamic characteristics even in faults cases. The controller's parameters are obtained using the linear matrix inequalities (LMI) optimization. Simulation results validate the effectiveness of this approach.     

Robust adaptive tracking with an additional plant identifier for a class of nonlinear systems

In this paper, we develop two new model reference adaptive control (MRAC) schemes for a class of nonlinear dynamic systems that is robust with respect to an uncertain state (output) dependent nonlinear perturbations and/or external disturbances with unknown bounds. The design is based on a controller parametrization with an adaptive integral action. Two types of adaptive controllers are considered—the state feedback controller with a plant parameter identifier, and the output feedback controller with a linear observer.     

Modeling and control of a piezoelectric actuator driven system with asymmetric hysteresis

This study describes the high-precision positioning control of a system with asymmetric hysteresis. A switching system concept is adopted to describe the Preisach-type hysteresis, and a systematic modeling procedure is established to obtain the parameters of the system. A piezoelectric actuator system driven by a voltage amplifier is used to verify the modeling accuracy. A control structure, comprising a feedforward controller and a PD-type feedback controller, is used to realize the high-precision positioning control of the piezoelectric actuator driven stage. To enhance tracking control, a high-frequency modified term is incorporated into the hysteresis model. The experimental results confirm that the addition of this modified term reduces the tracking error and prevents the controlling energy from being saturated.     

Bifurcation analysis and control of a discrete harvested prey-predator system with Beddington-DeAngelis functional response

In this paper, we study a discrete prey-predator system with harvesting of both species and Beddington-DeAngelis functional response. By using the center manifold theorem and bifurcation theory, we establish that the system undergoes flip bifurcation and Hopf bifurcation when the harvesting effort of prey population passes some critical values. Numerical simulations exhibit period-6, 10, 12, 14, 20 orbits, cascade of period-doubling bifurcation in period-2, 4, 8, 16 orbits and chaotic sets. At the same time, the numerically computed Lyapunov exponents confirm the complex dynamical behaviors. Moreover, a state delayed feedback control method, which can be implemented only by adjusting the harvesting effort for the prey population, is proposed to drive the discrete prey-predator system to a steady state.