网络既约梯度法在水电系统经济调度中的应用

本文采用网络特性的改进既约梯度法进行水电系统优化调度计算，适用于具有梯级电站或混联式水电站群的水电系统的经济调度。该法具有计算速度快，收敛精度高，占用内存少等特点。     

Effect of Nonlinearities in Turbine Governor System on Torsional Oscillation Stability

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Nonlinear dynamics theory on the steady state interface pattern during solidification of a dilute binary alloy

The nonlinear dynamics equations of the time dependence of the perturbation amplitude of the solid/ liquid interface during unidirectional solidification of a dilute binary alloy are established. The solutions to these equations are obtained, and the condition of the initial steady state growth of the cellular and dendritic structure after the planar solid/liquid interface bifurcates (mGc> G) with the increase of the growth rate is given. The condition of the steady state growth of fine cellular and dendritic structure in the beginning after the coarse dendrites bifurcate ( mGc<Γw2 + G) under the rapid solidification is obtained. The relationship of the steady state cell and dendrite tip radius, the perturbation amplitude and wavelength at the solid/liquid interface is presented.     

Adaptive Variable Structure Control Design for Uncertain Time-Delayed Systems with Nonlinear Input

This paper presents a new robust control for uncertain dynamic time-delayed systems with series nonlinearities. It is implemented by using variable structure control. The proposed variable structure controller ensures the global reaching condition of the sliding mode of the uncertain time-delayed system. However, in the sliding mode, the investigated uncertain time-delayed system still bears the insensitivity to the uncertainties and disturbances as the systems with linear input. Furthermore, the proposed controller is achieved through adaptive variable structure control without the limitation of knowing the bounds of the uncertainties and perturbations in advance.     

基于状态观测器的迟滞非线性系统输出反馈控制

利用Preisach模型与其边界线之间的映射关系建立了容易在线更新的迟滞模型．将模型和径向基网络相结合，针对一类动态多映射迟滞非线性系统设计了输出反馈控制器．应用LyaPunov定理得到系统控制律和神经网络权值更新律，从而保证了闭环系统的跟踪误差及网络权值偏差收敛到原点的某个有界邻域内．     

广义稳态的工业过程及其优化控制

阐述了工业过程中出现的拟周期和混沌等动态行为，并分析了形成的原因和条件．介绍了与之密切相关的非线性科学中的混沌、微分动力学系统以及遍历论等理论，综述了工业过程的广义稳态优化控制的研究成果、理论意义和实用价值及其发展方向．     

非单点模糊逻辑系统在非线性信道均衡中的应用

提出一种新的基于非单点模糊逻辑系统的自适应模糊滤波器的设计方法，研究和对比了自适应非单点模糊滤波器在非线性数字通信信道均衡中的应用，仿真结果表明，基于非单点模糊逻辑系统的信道均衡器能够有效地遏制信道的时变性和随机噪声干扰，可有效地解决数字信道的非线性畸变问题；从提高数字通信信道的传输正确率和传输效率来说，具有较强的适应能力。     

输入非线性广义预测控制系统的吸引域分析与设计

对输入非线性包括输入饱和与Hammerstein非线性的系统,采用两步法广义预测控 制(TSGPC)策略.首先不考虑输入非线性,采用线性GPC求解期望的中间变量,然后采用 解方程的方法处理Hammerstein非线性并用解饱和方法满足饱和约束.将TSGPC转化为状 态空间描述,研究该控制策略的吸引域问题.将吸引域的求解化为迭代求解的优化问题,给 出了求解算法和满足给定吸引域要求的控制器的调整方法.通过仿真验证了理论结果.     

Anti-windup control design for exponentially unstable LTI systems with actuator saturation

In this paper, a new saturation control technique in the framework of anti-windup compensation is developed for exponentially unstable linear time-invariant systems subject to input nonlinearities. The proposed control algorithm guarantees regional stability in the existence of input saturation, and provides less conservative performance than most existing anti-windup schemes. Moreover, an explicit form of anti-windup controller with its order no more than the order of the plant is derived. An inverted pendulum example is used to demonstrate the advantages of the newly proposed anti-windup control technique.     

Nonlinearity Measurements of High-Power Laser Detectors at NIST

We briefly explain the fundamentals of detector nonlinearity applicable to both electrical and optical nonlinearity measurements. We specifically discuss the attenuation method for optical nonlinearity measurement that the NIST system is based upon, and we review the possible sources of nonlinearity inherent to thermal detectors used with high-power lasers. We also describe, in detail, the NIST nonlinearity measurement system, in which detector responsivity can be measured at wavelengths of 1.06 µm and 10.6 µm, over a power range from 1 W to 1000 W. We present the data processing method used and show measurement results depicting both positive and negative nonlinear behavior. The expanded uncertainty of a typical NIST high-power laser detector calibration including nonlinearity characterization is about 1.3 %.