用FIR滤波器—PPSV实现混沌和超混沌控制

利用数字ＦＩＲ滤波器和正比于系统变量的脉冲反馈法的级联控制非线性连续系统中的混沌和超混沌。以实数Ｌｏｒｅｎｚ系统和复数洛仑兹－哈肯系统为例进行了数值研究。结果表明：ＦＲＩ－ＰＰＳＶ级联控制法比仅用ＦＩＲ滤波法或ＰＰＳＶ法更能有效地控制非线性连续系统中的混沌和超混沌,且抗噪性能ＰＰＳＶ法有显著提高。     

超混沌同步的非线性控制法

用李雅普诺夫函数法与尝试法相结合的方法，构造了１组典型的非线性反馈函数，实现了２个超混沌Ｒｏｓｓｌｅｒ系统的同步。     

实现混沌同步的非线性变量反馈控制方法

应用非线性变量反馈控制法，通过李雅普诺夫函数方法和尝试法，分别构造了一些非线性反馈函数，并用以实现了对Ｒｏｓｓｌｅｒ系统和改进的Ｌｏｒｅｎｚ系统混沌同步，２种方法起着相互补充的作用。     

统一混沌系统的脉冲控制与同步

对统一混沌系统的脉冲控制稳定性与同步问题进行了理论分析，利用脉冲微分方程理论给出了脉冲控制稳定与同步的充分条件，并对脉冲控制时间间隔的范围作了估计。最后，通过仿真进行了验证。     

33 外腔反馈式半导体激光器的混沌化与混沌控制

本工作首先通过增加外腔反馈式半导体激光器的激光反馈时间，使系统达到混沌化，然后采用滑模变结构控制方法实现了这种激光器的混沌控制所需的周期态。这种将混沌反控制与混沌控制相结合的方法具有明显的优点，可使系统既能很快地获得稳定的输出激光，又能根据工程需要实现激光输出功率强度的灵活调整，提高了能量转换效率。理论分析和数值计算结果表明，控制结果具有很强的稳定性和鲁棒性，这对改善实际激光系统稳态输出特性，有较好的参考价值。     

26 半导体激光器的混沌反控制与自适应控制

在实际工程中，将一个稳定周期系统驱动到另一个周期态去，必须用足够大的外力才能实现，这就要消耗足够大的能量。混沌反控制则可使系统处于混沌状态，然后获得混沌系统的吸引子具有无穷多的周期态，就可用极小的代价来实现混沌控制，从而达到所需要的稳定周期态。这样，不仅不必回避系统出现的混沌运动，而且在可能条件下人为地将系统首先引导到混沌状态下，然后对这种混沌系统施加某种混沌控制方法，使系统在无穷多规则态的态库中进行自由选择和自由转换，实现目标轨道的灵活选择，这正是混沌控制较其他控制最为显著的优点之一。     

强流束晕-混沌的控制方法研究进展

强流束产生的束晕-混沌已成为强流离子束应用中的关键技术之一。束晕-混沌具有时空复杂性,需进行有效的控制才能确保强流离子束的许多重要应用。特别是强流离子束在核材料生产与增殖、放射性废物嬗变、放射性药物生产及重离子聚变等国防和国民经济领域中具有很好的应用潜力和发     

实验反应堆功率调节系统PID控制器的解析设计方法

通过对实验反应堆系统模型进行线性化和模型降阶、再对降阶模型进行PID控制器的理论设计的方法，可使反应堆功率调节系统的设计最优化、客观化和解析化。将此解析化方法应用于—实验反应堆功率调节系统的设计，通过数值仿真证明：设计的控制器控制效果良好，该解析化设计方法可行?     

基于FPGA的PID光束稳定控制系统研制

为了抑制外来振动对上海光源红外光束稳定性的影响,提高实验站的供光品质,研制了一种以数字PID控制器为核心的反馈控制系统。同时分析了数字PID控制算法,并应用FPGA技术,采用自顶向下的方法进行Verilog语言和原理图相结合的方式编程,设计了增量式数字PID控制器。测试结果表明:该反馈控制系统能有效地抑制红外光束的光斑位置抖动,最大工作带宽250 Hz。     

Decoupling Control of Nonlinear Coupled Core Reactor

This paper concerns the application of the decoupling theory for a nonlinear system to the power control of the coupled core reactor. By using this theory, we can deal with the power change problem, the regulating problem for a system subject to a large perturbation, etc., which cannot be dealt with by the decoupling theory for a linear system.

But, since this theory assumes tacitly that all the states are measurable, the theory can not be applied directly to the nuclear reactor that has nonmeasurable state variables such as the delayed neutron precursor. In this paper, the above difficulty is overcome by introducing the observer theory for a nonlinear system.

The decoupling controller and observer resulted from these theories are applied to the coupled core reactor and the dynamic characteristic of the reactor is simulated by the digital computer. The simulation shows that the reactor power of each core is controlled satisfactorily in decoupling manner.     

The Construction of Plasma Density Feedback Control System on J-TEXT Tokamak

The plasma density feedback control system(PDFCS) has been established on the Joint Texas Experimental Tokamak(J-TEXT) for meeting the need for an accurate plasma density in physical experiments.It consists of a density measurement subsystem,a feedback control subsystem and a gas puffing subsystem.According to the characteristic of the gas puffing system,a voltage amplitude control mode has been applied in the feedback control strategy,which is accomplished by the proportion,integral and differential(PID) controller.In this system,the quantity calibration of gas injection,adjusted responding to the change of the density signal,has been carried out.Some experimental results are shown and discussed.     

Identification of Transfer Functions in Feedback System and Inverse Problem

A unified theory of identification in a feedback system is presented from the viewpoint of inverse problem on reactor noise. A power reactor described by a 4 block feedback model is expressed in terms of equivalent correlation functions as a 5 block feedback model with an additional loop, if one of subsystems of the reactor becomes unstable, however, the total system is stable by negative feedback effects, and if noise sources are not independent. The addition of a loop in the feedback system leads errors in estimation of open loop transfer functions. In the case, modified open loop transfer functions are identified instead of original ones. From the viewpoint of reactor diagnosis, notes on system identification are discussed on an open loop transfer function in a low power reactor and on effects of diagonalization in covariance space of noise sources.     

基于VxWorks的密度反馈控制系统的基本性能分析

从任务执行时间和实时性两个方面分析了基于windows与VxWorks双操作系统的HT-7超导托卡马克装置上等离子体密度反馈控制系统(DFCS)的特点,并和基于Windows与Linux下的系统进行了比较。结果表明：基于Windows与VxWorks双操作系统的DFCS具有更好的实时性、更为精确的控制效果以及更加稳定的控制过程。     

Design of Controller for New EAST Fast Control Power Supply

The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control system is needed to restrain the plasma＇s vertical displacement. A fast control power supply is needed to excite the active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, the fast control power supply needs to keep on enhancing the fast response and output current. The structure of a new power supply is introduced in this paper. The method of multiple inverters paralleled with the current sharing reactor is presented to meet the need for large current and fast control. According to the design demands of the EAST fast control power supply, the adjuster of the current close loop is applied to the inverter, which can advance its ability to restrain the loop current in low frequency and DC output. The result of the experiment confirms the validity of the proposed scheme and control strategy.     

Feedback Control System for Antenna Phase Difference in the LHCD Experiments

It is well accepted that lower hybrid current drive （LHCD） is the most efficient method for non-inductive current drive in fusion devices and the effect of the current drive is dependent on not only microwave power but also its grill phase shift. This paper presents a new kind of feedback control system for antenna phase difference in LHCD experiments. In this highspeed control system, a lot of new technologies and methods are incorporated. The results of the experiments show a very good agreement with the system design.     

Reactivity Control Capability of Fuel-Salt Processing System in a Molten-Salt Breeder Reactor

An evaluation is made of the reactivity control capability of the fuel processing system (FPS) in a molten-salt breeder reactor. The principal functions required of the FPS are : (a) Isolation of ²³³Pa from regions of high neutron flux during its decay to ²³³U, and (b) the removal of fission products from the system. The FPS can very usefully serve also to control the primary system reactivity by appropriately utilizing its function of extracting uranium and reconstituting the fuel contained in the salt. The principles of operation are quite similar to the chemical shim control system currently installed in PWR's whereby the core reactivity, affected by changes in the moderator temperature, fuel burnup and transient Xe, is adjusted by regulating the concentration of boric acid introducted in the moderator as neutron absorber. The present study examines the capability of the FPS to follow transient Xe as in PWR's, and proves that the FPS should effectively serve as a system for adjusting not only long-term changes in reactivity but also short-term transient variations without any accompanying difficulties foreseen in operation.