建筑物利用液柱式阻尼器优化吸震参数

液柱式阻尼器(LCVA)的U型管的横截面积非均匀,其自振频率不仅取决于液柱长度,还取决于其几何形状,从而比液体阻尼器(TLCD)具有更大优越性,本文研究了新型的被动调谐减震装置LCVA在地震作用下的优化参数,提出了求最优均方反应的直接法,比TLCD文献中所用的叠代法更为简捷有效.     

通过干扰抑制实现电力系统励磁鲁棒非线性控制

对单机无穷大系统，基于耗散系统的概念，提出了一种新的通过干扰抑制实现的励磁鲁棒非线性控制策略，在实现过程中不需要任何线性化方法。该控制策略可提高系统对动态不确定性的鲁棒性，可抑制干扰对系统的影响。仿真结果表明，提出的励磁控制策略可提高电力系统暂态稳定性。     

A new separation result for a class of quadratic-like systems with application to Euler-Lagrange models

A separation result for some kind of global stabilization via output feedback of a class of nonlinear systems, under the form of some stabilizability by state feedback on the one hand, and some unboundedness observability on the other hand is presented. They allow to design, for any domain of output initial condition, some dynamic output feedback controller achieving global stability. It is also highlighted how disturbance attenuation can further be achieved on the same basis. As an example, the proposed conditions are shown to be satisfied by the class of so-called Euler-Lagrange systems, for which a tracking output feedback control law is thus proposed.     

故障检测滤波器的鲁棒性设计

该文设计了全维非线性未知输入观测器，实现检测滤波器对于被控对象模型误差和系统不确定性因素的干扰解耦。某型航空发动机控制系统传感器和执行机构的故障检测仿真实验表明，具有干扰解耦的故障检测滤波器可以准确地对传感器和执行机构的故障进行检测和隔离，提高了检测滤波器对于故障检测的鲁棒性。     

基于耗散系统实现电力系统励磁鲁棒非线性控制

对单机无穷大系统，通过适当的坐标变换，基于耗散系统的概念，提出了一种新的通过干扰抑制实现的励磁鲁棒非线性控制策略，在实现过程中不需要任何线性化方法．该控制策略可提高系统对动态不确定性的鲁棒性，可抑制干扰对系统的影响．仿真结果表明，提出的励磁控制策略可提高电力系统暂态稳定性．     

低压配电线宽带通信技术

介绍了目前宽带PIC技术所广泛采用的正交频分复用(OFDM)数字调制方法，并分析了如何用OFDM来克服宽带PIC所遇到的噪声干扰和衰减问题，然后简单介绍了电力线宽带通信的国际标准HomePlug 1．0，并介绍了该公司开发的14Mbit／s和45Mbit／s宽带PLC产品及其在我国配电网实际应用中的相关数据。     

移动通信中电波传播损耗的预测模型

在自由空间电波传播损耗模型基础上，基于微小区内电波传播新特点，给出了电波传播损耗的一般预测模型，其特点是用最小拐点距离D来统一反映天线高度和系统工作频率对电波传播损耗的影响，同时对电波在传播过程中经过的不同环境，分别用不同的路径衰减指数n来反映。     

Effect of interactions between voltage and current harmonics on the net harmonic current produced by single phase non-linear loads

The effect of the interaction between both load voltage and current harmonics on the net harmonic current produced by different types of single phase non-linear loads is investigated. Two types of loads are considered: the fluorescent lamps' load and single phase diode bridge rectifiers' load. Studies are done on each load alone and then on the combination of both. The electromagnetic transient program has been used to model these loads. The computer simulations are supported by laboratory testing. The main conclusion of this work is that neglecting the interactions between both voltage and current harmonics will result in incorrect estimation of the harmonic current produced by these loads. Also it is concluded that using a combination of different types of loads can result in a reduction of the current and voltage distortions.     

超高频振动下材料本构关系探析

金属材料在超高频振动作用下的屈服点，硬化度和延伸率都较常规情况明显降低，因此材料的本构关系发生了重大变化。研究金属材料在超高频振动下的特殊行为，建立材料在超高频振动下的本构方程，利用所建立的本构方程解释这些特殊现象，给出了低碳钢试件的实验曲线，通过与理论分析比较证明二者完全相符。     

Disturbance Attenuation and Trajectory Tracking via a Reduced-order Output Feedback Controller for Robot Manipulators

This paper presents a solution to the problem of trajectory tracking with external disturbance attenuation in robotics systems via a reduced-order output feedback controller, without velocity measurement. The proposed control law ensures both semi-global asymptotic stability of the closed-loop system and external disturbance attenuation. The approach is based on the notion of the L₂-gain and requires to solve two algebraic Riccati inequalities. The proposed controller design is illustrated by a simulation example.