Optimal Design of Control Devices for Vibration Control of Buildings

随着社会的发展和技术的进步，土木工程结构的防灾减震已愈来愈受到人们的重视，土木工程结构的振动控制技术也随之进入蓬勃发展的阶段，许多新型控制体系和控制装置相继出现。振动控制技术在土木工程中的运用也产生了许多新的研究领域，控制器的优化设计问题便是其中之一。控制器的优化设计一般包括两个方面：一是被动控制器相关参数的优化或主动控制器最优控制律的选取；二是控制器的数目和安装位置优化。本文在以往研究的基础上，基于能量的观点，结合两结构互连控制体系和三维结构控制体系对控制器的优化设计问题进行了研究。主要完成的工作如下： (1)建立了两结构互连控制体系的动力学模型，在此基础上，提出了被动控制器(包括弹性及阻...With the development of human society and the progress of technology, in recent years, more and more attention has been paid to the disasterproof or aseismic design of civil structures, which promotes the development of vibration control technology in civil engineering greatly. As a result, various innovative control devices and systems have been developed and studied, and many new research fields...学位：工学硕士院系专业：建筑与土木工程学院土木工程系_结构工程学号：20043501

THE ANALYSIS OF FLOOR RESPONSE SPECTRUM IN EQUIPMENT-STRUCTURE INTERACTION FORM IN FREQUENCY DOMAIN

直接从由建筑物和设备组成的主次结构耦合系统各自的动力特性出发,考虑主次结构间调谐、干扰、非经典阻尼等因素的影响,推导出频率传递函数和次结构的加速度均方根响应,并由此进一步得到楼层的加速度均方根反应谱。这一方法避免了求解联合系统的复特征值和动力方程出现病态等问题,大大简化了计算过程。最后在算例中就次结构的阻尼比、质量比、安装楼层及场地土等因素对楼层加速度均方根反应谱的影响进行了讨论,算例表明,质量比是决定能否采用古典谱的关键因素,场地土对反应谱的影响也不容忽视。Based on the dynamic properties of the primary-secondary coupling structural system composed of an equipment and a structure,the frequency transfer function and the root mean square of acceleration response of the equipment are deduced directly,and the factors including tuning,interaction and non-classical damping have been taken into consideration in the process of deduction.Furthermore,the floor response spectrum of the root mean square of acceleration is obtained.Since the calculation of the complex eigenvalue problem and the ill-conditioned equation of motion of the combined system are avoided in this approach,the procedure of calculation is simplified greatly.In the end,the influencing factors on the floor response spectrum are discussed,including damping ratio,mass ratio,the location of the equipment and the soil of the building site.As shown in the numerical example,the mass ratio is the key factor in deciding whether the classical floor response spectrum may be used or not,and the influence of the soil of the building site should not be ignored

Seismic Analysis of the Primary-secondary Coupling Structural System with Multi-connections by Using Modal Truncation Technique

建立了多点连接主次结构耦合系统的数学模型,并利用模态截断技术求出各自的模态响应传递函数和位移响应,以主次结构系统的位移功率谱密度函数在整个频率域内的积分得到位移响应的均方根值并与精确解进行比较.算例表明,即使在只取主次结构前几阶模态的情况下,该方法仍具有很高的精度;将次结构视为MTMD(复合调频质量阻尼器)系统来控制主结构的位移均方响应,分析了主次结构的质量比、次结构的刚度质量比和模态阻尼比等因素对控制效果的影响,算例表明,次结构的刚度质量比是影响控制效果的关键因素.The mathematical model of the primary-secondary coupling structural system with multi-connections is proposed.By using modal truncation technique,the frequency-domain modal transfer function and displacement response of the primary and secondary structures are obtained respectively.The root mean square of displacement responses are calculated by integrating the power spectral density functions in frequency domain.The results of an numerical example show that the accuracy of the approach is pretty good with comparison to the precise results,even only the first few modes of the two structural systems have been used.Meanwhile,the secondary structural system may be used as an MTMD system(Multiple Tuned Mass Damper) to control the root mean square of displacement responses of the primary structural system.And the control effectiveness are also discussed,including the mass ratio of the primary and secondary structural systems,the stiffness-mass ratio of the secondary structural system and the mode damping ratio.Numerical example shows that the stiffness-mass ratio of the secondary structural system is the key factor that affects the control effectiveness

室内可见光通信调制与解调技术的研究进展

近年来,基于发光二极管（LED）的室内可见光通信（IVLC）技术正逐步成为宽带光通信接入领域的研究热点。目前世界各国正在推动5G产业化工作,其中一个关键要求是必须实现更高的数据传输速率。为了进一步提高IVLC的传输速率和系统性能,需要引进更为先进的调制解调技术。文章介绍了IVLC技术的研究背景和系统模型,总结了IVLC中正交频分复用（OFDM）、离散多音（DMT）和无载波幅相（CAP）调制及多输入多输出（MIMO）等技术的研究进展,并对IVLC技术未来的发展趋势和所面临的挑战进行了分析

应用曼彻斯特码的海岛间自由空间光通信系统

针对海岛间通信系统存在建设成本高和传输信号需要中继放大等问题，文章采用曼彻斯特编解码设计了一种新型自由空间光(FSO)通信系统，支持100 km海底光缆(采用G.654普通单模光纤)级联1 km FSO无线链路实现10 Gbit/s光信号的收发和传输。文章采用仿真实验测试了无线光信号在晴天、雨天和雾天中传输前后的时域波形、光谱、眼图和误码率(BER)等指标。研究结果表明，光信号接收机灵敏度在背对背系统中为-18.92 dBm；光信号接收机在晴天、雨天和雾天，经100 km海底光缆级联1 km FSO信道传输信号时的灵敏度分别为-17.72、-16.66和-11.16 dBm。相关结果证明，应用曼彻斯特码的海岛间FSO通信系统在未来海域信息传输领域具有重要的潜在应用价值

黑河流域生态—水文过程集成研究进展

国家自然科学基金重大研究计划"黑河流域生态—水文过程集成研究"(简称黑河计划)贯穿地球系统科学的思维,针对我国内陆河地区严峻的水—生态问题,探索流域尺度提高水效益的理论和方法。计划执行4年来,建立了遥感—监测—实验一体的流域生态水文观测系统及其相应的数据平台;初步揭示了流域冰川、森林、绿洲等重要生态水文过程耦合机理,认识了流域一级生态水文单元的水系统特征,奠定了流域水循环、水平衡的科学基础;计算了黑河下游生态需水量,为黑河流域水资源优化管理厘定了重要的约束条件。今后几年将在高精度气、水、生、经时空数据的支持下,耦合与集成流域综合模型,保证我国流域科学能在世界前沿占一席之地