利用小波变换测量与识别轻微幅度变化与相位变化的方法

幅度变化(AD)与相位变化(PD)是电能质量扰动的重要组成部分。为了深入研究电能质量问题，该文提出一种能确定AD、PD的位置，能在小波变换(WT)域分离它们，从而测量它们的幅度，判别它们的类型的方法。该文方法的显著特点是：平滑滤波器为Haar滤波器的双正交紧支复小波，只须在很少尺度上执行输出移动不变的快速小波变换方法；AD与PD在WT域自动分离，AD幅度、PD幅度与WT输出存在简单关系；只须在一个尺度上提取简单的二进数特征量；只须进行简单的二一十进制转换的识别方法等。这些独特的技术，使得该文方法又快、又准确、又简单。     

具有正弦扰动的时滞系统前馈-反馈次优控制:灵敏度法

研究线性时滞系统在外部正弦扰动作用下的前馈-反馈最优减振问题,提出了一种最优控制律的灵敏度设计方法．通过引入灵敏度参数并围绕它展开幂级数,将系统的最优控制问题简化为不含超前项和时滞项的两点边值问题族．通过截取最优控制级数的有限和获得原系统的前馈-反馈次优控制律．仿真结果表明,与经典状态反馈最优控制相比,本文的算法更加鲁棒,能更加有效地抑制正弦扰动．     

卷绕传输系统偏心张力干扰的自适应消除法

提出一种自适应算法可用于补偿工业卷绕传输系统中因卷绕轴轮的偏心所造成的影响.轴轮的偏心导致卷绕物张力干扰,干扰信号的频率随轴轮转速而缓慢变化.提出的自适应算法基于锁相回路结构,可在线估测出干扰信号的相位及幅值大小并消除其影响.还给出了这种算法的频域分析及参数设计方法,并通过仿真结果验证该算法消除轴轮偏心所造成的张力干扰的能力.     

Robust control strategies for multi-inventory systems with average flow constraints

In this paper, we consider multi-inventory systems in the presence of uncertain demand. We assume that (i) demand is unknown but bounded in an assigned compact set and (ii) the control inputs (controlled flows) are subject to assigned constraints. Given a long-term average demand, we select a nominal flow that feeds such a demand. In this context, we are interested in a control strategy that meets at each time all possible current demands and achieves the nominal flow in the average. We provide necessary and sufficient conditions for such a strategy to exist and we characterize the set of achievable flows. Such conditions are based on linear programming and thus they are constructive. In the special case of a static flow (i.e. a system with 0-capacity buffers) we show that the strategy must be affine. The dynamic problem can be solved by a linear-saturated control strategy (inspired by the previous one). We provide numerical analysis and illustrative examples.     

Adaptive robust control of nonholonomic systems with stochastic disturbances

Based on the Brockett’s necessary condition for feedback asymptotic stabilization[1], nonholonomic systems fail to be stabilized at the origin by any static continuous state feedback though they are open loop controllable. There are two novel approaches …     

监测记录电源干扰的触发装置

本文介绍一种用于监测多路电源实时干扰的故障触发器。在电力系统中，将这个触发器和数字示波器配合可快速、准确测出电压波形的变化，在其它需要检测波形偏差的地方也可采用这个触发装置。     

正十烷加氢裂化集总动力学的研究

本文选用国产３８２５加氢裂化催化剂，对正十烷加氢裂化动力学进行了研究，根据Ｗｅｅｋｍａｎ集总原理，建立了正十烷加氢裂化四集总动力学模型．利用Ｍａｒｑｕａｒｄｔ法估计了各反应速率常数．确定了较完善的速率表达式．计算了两种压力（６．５ＭＰａ，８．５ＭＰａ）下的表现活化能，预测了各反应产物分布，其计算结果与实验值吻合．同时，讨论了空速、温度、压力和反应活化能对产物分布的影响，为重油和渣油加氢裂化集总动力学研究提供了基础数据．     

从PID技术到"自抗扰控制"技术

从传统PID的原理出发，分析了它的优缺点。利用非线性机制来开发了一些具有特殊功能的环节：跟踪微分器（TD），扩张状态观测器（ESO），非线性PID（NPID）等，并以此组合出高品质的新型控制器－自抗扰控制器（ADRC），从而形成了新的“自抗扰控制”技术。新型的控制器具有算法简单、参数易于调节的特点。     

无阻尼绕组双轴励磁同步发电机的静态稳定分析

文章对无阻尼绕组双轴励磁同步发电机的静态稳定性进行了详细地分析,建立了其基本方程以及微干扰分析的线性化数学模型。并通过实例,根据计算机结果,对单轴励磁和双轴励磁两种发电机的稳定性进行了比较,从而说明在一定条件下,双轴励磁可以提高同步发电机的静态稳定性.     

Qualitative analysis of mathematical arc models using Lyapunov theory

An approach is proposed to the study of the electric arc near current zero by means of mathematical models. The approach is based on Lyapunov's stability theory and allows a qualitative analysis of the nonlinear differential equations describing the phenomenon. The main results concern the determination of the set of conditions leading to arc extinction and their dependence on the physical parameters involved. The classical Mayr and Cassie models are studied using the method, and some numerical results are given.