Optimum design and experimental study of multiple tuned mass dampers with limited stroke     

Chi‐Chang Lin  Chih‐Shiuan Lin 《地震工程与结构动力学》2010,39(14):1631-1651

This paper develops a two‐stage optimum design procedure for multiple tuned mass dampers (MTMD) to reduce structural dynamic responses with the limitation of MTMD's stroke. A new performance index, which is a linear combination of structural response ratio and MTMD stroke ratio by a weighting factor α, is proposed; α is in the range from 0 to 1.0. The larger the α, the more important the stroke. The case of α=1.0 indicates that MTMD is locked. The analytical results show that the MTMD's stroke can be significantly suppressed with little sacrifice of structural control effectiveness when an appropriate α is selected. To verify the design algorithm, a 360 kg‐MTMD composed of five TMD units arranged in parallel was fabricated. Shaking table tests of a large‐scale three‐story building with and without the MTMD under earthquake excitations were conducted at the National Center for Research on Earthquake Engineering (NCREE) in Taiwan. The experimental results show that MTMD is not only effective in mitigating the building responses but also is successful in suppressing its stroke. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Semi‐active tuned mass damper building systems: Application     

Min‐Ho Chey  J. Geoffrey Chase  John B. Mander  Athol J. Carr 《地震工程与结构动力学》2010,39(1):69-89

Seismic performance attributes of multi‐story passive and semi‐active tuned mass damper (PTMD and SATMD) building systems are investigated for 12‐story moment resisting frames modeled as ‘10+2’ stories and ‘8+4’ stories. Segmented upper portion of the stories are isolated as a tuned mass, and a passive viscous damper or semi‐active resetable device is adopted as energy dissipation strategy. The semi‐active approach uses feedback control to alter or manipulate the reaction forces, effectively re‐tuning the system depending on the structural response. Optimum tuned mass damper control parameters and appropriate matching SATMD configurations are adopted from a companion study on a simplified two‐degree‐of‐freedom system. Statistical performance metrics are presented for 30 probabilistically scaled earthquake records from the SAC project. Time history analyses are used to compute response reduction factors across a wide range of seismic hazard intensities. Results show that large SATMD systems can effectively manage seismic response for multi‐degree‐of freedom systems across a broad range of ground motions in comparison to passive solutions. Specific results include the identification of differences in the mechanisms by which SATMD and PTMD systems remove energy, based on the differences in the devices used. Additionally, variability is seen to be tighter for the SATMD systems across the suites of ground motions used, indicating a more robust control system. While the overall efficacy of the concept is shown the major issues, such as isolation layer displacement, are discussed in detail not available in simplified spectral analyses, providing further insight into the dynamics of these issues for these systems. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

利用中位数进行光纤陀螺信号抗差估计     

蒋庆仙  王成宾  马小辉  陈晓璧 《武汉大学学报(信息科学版)》2011,(6)

为了削弱光纤陀螺信号中异常噪声对寻北精度的影响,在滤除高频周期噪声的基础上,提出了一种处理陀螺信号的新算法。推导了陀螺信号的抗差解公式及其误差影响函数,取观测值的中位数作为抗差初值,利用一次抗差估计求得的观测残差再用中位数法求得均方差因子,并给出了高崩溃污染率的初值辅以IGGⅢ方案迭代解算的混合算法。计算结果表明,基于可靠初值和均方差因子估值的抗差估计可以有效削弱异常干扰对陀螺的影响。  相似文献   

Bi‐directional coupled tuned mass dampers for the seismic response control of two‐way asymmetric‐plan buildings     

Keh‐Chyuan Tsai  Yi‐Jer Yu 《地震工程与结构动力学》2011,40(6):675-690

This paper proposes bi‐directional coupled tuned mass dampers (BiCTMDs) for the seismic response control of two‐way asymmetric‐plan buildings subjected to bi‐directional ground motions. The proposed BiCTMD was developed from the three‐degree‐of‐freedom modal system, which represents the vibration mode of a two‐way asymmetric‐plan building. The performance of the proposed BiCTMD for the seismic response control of elastic two‐way asymmetric‐plan buildings was verified by investigating the reductions of the amplitudes of the associated frequency response functions. In addition, the investigation showed that the proposed BiCTMD is effective in reducing the seismic damage of inelastic asymmetric‐plan buildings. Therefore, the BiCTMD is an effective approach for the seismic response control of both elastic and inelastic two‐way asymmetric‐plan buildings. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

调谐质量阻尼器对海洋平台的减振效果分析   总被引：3，自引：0，他引：3  

嵇春艳 《海洋技术学报》2005,24(2):114-120

目前调谐质量阻尼器(TMD)的研究和设计多数是依据结构的第一阶模态进行的,忽略了TMD对结构其它模态的影响。为了明确TMD是否会对结构的高阶模态造成不利的影响以及影响的程度,论文采用模态分析法将海洋平台-TMD系统进行模态分解,推导出系统各阶模态的状态空间方程。并以一海洋平台为算例,讨论TMD针对结构的某一摸态进行设计时对各阶模态响应的减振效果,仿真的结果表明TMD对设计的模态有较好的减振效果,但对平台的其它模态响应的减振幅度有限,甚至产生不利影响,使某些模态的振动响应增幅较大。  相似文献   

调质阻尼器地震反应控制应用研究   总被引：6，自引：0，他引：6  

胡晓锋  胡世德 《地震工程与工程振动》2000,20(2):112-116

本文在结构地震反应时程分析基础上,研究调质阻尼器控制地震反应的最优参数设计方法,分析了多自由度体系的阻尼器设计以及调质阻尼器控制的失调效应．并用算例验证了该设计方法用于地震反应控制的可行性。  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   

大型贯通测量中加测陀螺定向边的位置选取分析     

任传建  王志红 《测绘与空间地理信息》2017,(3)

大型贯通测量中常常使用加测陀螺边来提高贯通测量精度,但目前对于陀螺定向边的位置选取并无明确规范和要求。本文主要探讨了不同位置的陀螺定向边选取对贯通测量精度的影响。实验结果表明,井下选取的陀螺定向边与测定仪器常数的地面已知边之间距离过大对于贯通测量精度影响较大,在井下选取陀螺定向边位置时,应与测定仪器常数的地面已知边距离保持在3 000 m以内为优。  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   

海洋工程模型运动测量装置的研制     

金志华  田蔚风  施红兵 《海洋工程》1997,(1)

本文介绍由磁通门数字罗盘和改进的航空垂直陀螺仪构成的海洋工程模型运动测量装置。装置简单实用，性能稳定可靠，试用表明它能满足海洋工程模型在风浪流作用下有关运动的测量要求。  相似文献