网壳结构的粘滞阻尼减振分析与试验研究   总被引：26，自引：0，他引：26  

范峰  沈世钊 《地震工程与工程振动》2000,20(1):105-111

本文将粘滞阻尼器引入网壳结构,针对网壳结构粘滞阻尼器减振系统,编制了有限元分析程序,并对网壳结构进行了大量的振动控制分析和计算。作者设计制做了适合网壳结构的粘滞阻尼器,进行了性能试验;在此基础上设计制作了一个球型网壳结构模型,并进行了粘滞阻尼器减振的地震模拟振动台试验。  相似文献   

Optimal Design of TMD Under Long-Term Nonstationary Wave Loading   总被引：3，自引：0，他引：3  

李华军  蒋济同  曹宏生  稽春艳  Tomotsuka TAKAYAMA 《中国海洋工程》2000,14(1):25-32

—Traditionally,the use of a tuned mass damper(TMD)is to improve the surviability of the pri-mary structure under extraordinary loading environment while the design loading condition is describedby either a harmonic function or a stationary random process that can be fully characterized by a powerspectral density(PSD)function.Aiming at prolonging the fatigue life of an offshore platform,this studyconsiders an optimal design of TMD for the platform under long-term nonstationary loading due tolong-term random sea waves characterized by a probabilistic power spectral density(PPSD)function.Inprinciple,a PPSD could be derived based on numerous ordinary PSD functions;and each of them is treat-ed as realization of the corresponding PPSD.This study provides a theoretical development for theoptimal TMD design by minimizing the cost function to be the mean square value of the expectedlong-term response.A numerical example is presented to illustrate the developed design procedure.  相似文献   

基于遗传算法的粘滞阻尼器减震结构优化设计研究          下载免费PDF全文

王子龙  任文杰 《世界地震工程》2021,(2):123-131

以线性粘滞阻尼器加固剪切型规则框架结构为研究对象,基于能量原理提出阻尼系数正比于层间位移(α+1)次方的分配方式,在此基础上提出了一种基于遗传算法的粘滞阻尼器减震结构优化设计方法.使得中震下结构最大层间位移角小于允许值,以满足"中震不坏"的设计目标,同时令附加总阻尼系数最小,满足经济性要求.以12层规则框架为例,分别采...  相似文献   

磁流变阻尼器对高层建筑风振反应的半主动控制   总被引：21，自引：3，他引：21  

周云  吴志远等 《地震工程与工程振动》2001,21(4):159-162

本文探讨了磁流变阻尼器在高层建筑风振控制中的应用，在经典线性最优控制理论的基础上，根据磁流变阻尼器的特点，提出了一种新型的半主动控制策略，应有该方法对一40层的钢结构的风振反应进行了计算机模拟，结果表明，采用磁流变阻尼器对高层建筑进行半主动控制的能够有效减小结构的风振反应。  相似文献   

Energy Analysis for TMD-Structure Systems Subjected to Impact Loading     

WANG  Shuqing 《中国海洋工程》2002,16(3):301-310

This paper investigates the characteristics of reduction of the lateral vibration by use of a Tuned Mass Damper(TMD) for offshore jacket platforms under impact loading. Unlike traditional analysis, the present analysis focnses on theenergy concept of TMD/structure systems. In this study, a time domain is taken. The platform is modeled as a simplifiedsingle-degree-of-freedom (SDOF) system by extraction of the first vibration mode of the structure and the excited force isassumed to be impact loading. The energy dissipation and energy transmission of the structure-TMD system are studied.Finally, an optimized TMD design for the modeled platform is demonstrated based on a new type of cost function - maxi-mum dissipated energy by TMD. Results indicate that TMD control is effective in reducing the standard deviation of thedeck motion but less effective in reducing the maximum response under impact loading.  相似文献   

Offshore Structural Control Considering Fluid Structure Interaction     

Ju Myung KIM Dong Hyawn KIM Gyu Won LEE 《中国海洋工程》2006,20(2):259-268

1.IntroductionAmong various control devices,Tuned Mass Damper(TMD)has been mostfrequently usedtothecontrol of structural vibration induced by oscillating loads such as earthquakes,winds,and waves.This is due to the fact that it operates without external e…  相似文献   

Detection of 6-cm radio-continuum emission from an EB (β-Lyrae type) variable star – HIP 68718     

M. W. B. Anderson  M. D. Filipovi&#; 《Monthly notices of the Royal Astronomical Society》2007,381(3):1027-1030

We report the 6-cm radio-continuum detection of a previously unknown radio star, HIP 68718, identified by the Hipparcos satellite as an EB or β-Lyrae type optical variable. Only five prior radio detections of this type are reported in the literature. The radio source (VLA J140402−002145) was detected at the 6σ level, with an associated <1 arcsec position error. The radio-optical separation is 0.2 arcsec and is well within the position errors. A ROSAT X-ray source (RXJ 1404.0−0021) is located 4.5 arcsec from the radio position. Based on the component spectral types (F5V + G5V), 1.52 d period, variations in the peak of the light curve and the X-ray and 6-cm radio luminosities, we conclude the star is a candidate RS CVn. The binary is in a near-contact phase based on the asymmetric light curve (O'Connell effect). Evidence of two faint possible companion objects was also found in the J - and K -band Two-Micron All-Sky Survey images.  相似文献   

日立MRP－7000临床应用经验     

陈正光 《CT理论与应用研究》1995,(1)

本文简介了我院应用日立ＭＲＰ—７０００的初步经验，提出性能稳定、图象质量好、软件技术先进的中、低场强的永磁型磁共振成像系统仍然适合于我国的各种类型的医疗机构．  相似文献   

X形和三角形钢板阻尼器的阻尼力模型(Ⅰ)--基于双线性本构关系   总被引：3，自引：1，他引：3  

李冀龙  欧进萍 《世界地震工程》2004,20(1):10-16

利用软钢的双线性本构关系，依据经典力学原理推导建立了X形和三角形钢板阻尼器的阻尼力滞回模型。首先，导出了单调加载下钢板阻尼器的力与位移关系及其渐近曲线；其次，对于软钢材料本构关系分别考虑在理想弹塑性和双线性强化模型基础上，推导建立了钢板阻尼器的阻尼力模型；最后，将钢板阻尼器的阻尼力模型及其参数与试验结果进行了比较，验证了理论模型的有效性，并分析了误差存在的原因。  相似文献   

三种阻尼减振结构抗震性能的对比分析   总被引：4，自引：0，他引：4  

吴斌  张纪刚  欧进萍 《世界地震工程》2004,20(1):75-81

对设置两种新型摩擦阻尼器(T形芯板摩擦阻尼器和拟粘滞摩擦阻尼器)和粘滞阻尼器的单自由度结构及多层实际工程结构进行了时程分析研究。结果表明，一方面三种阻尼器都能有效地控制结构的反应，另一方面T形芯板摩擦阻尼器的位移控制效果略好于拟粘滞摩擦阻尼器，但是后者的加速度控制效果好于前者。  相似文献