Output-only structural identification is developed by a refined Frequency Domain Decomposition（rFDD） approach, towards assessing current modal properties of heavy-damped buildings（in terms of identification challe...Output-only structural identification is developed by a refined Frequency Domain Decomposition（rFDD） approach, towards assessing current modal properties of heavy-damped buildings（in terms of identification challenge）, under strong ground motions. Structural responses from earthquake excitations are taken as input signals for the identification algorithm. A new dedicated computational procedure, based on coupled Chebyshev Type Ⅱ bandpass filters, is outlined for the effective estimation of natural frequencies, mode shapes and modal damping ratios. The identification technique is also coupled with a Gabor Wavelet Transform, resulting in an effective and self-contained time-frequency analysis framework. Simulated response signals generated by shear-type frames（with variable structural features） are used as a necessary validation condition. In this context use is made of a complete set of seismic records taken from the FEMA P695 database, i.e. all 44 ＂Far-Field＂（22 NS, 22 WE） earthquake signals. The modal estimates are statistically compared to their target values, proving the accuracy of the developed algorithm in providing prompt and accurate estimates of all current strong ground motion modal parameters. At this stage, such analysis tool may be employed for convenient application in the realm of Earthquake Engineering, towards potential Structural Health Monitoring and damage detection purposes.展开更多
本文详细阐述了VxWorks for SPARC的异常处理机制,分析VxWorks操作系统对于异常处理的流程,指出其中不适应于高可靠性嵌入式应用的地方,并提出了结合当前应用设计异常处理策略的改进优化方案,结合SPARC体系架构的TSC695F处理器,完成了...本文详细阐述了VxWorks for SPARC的异常处理机制,分析VxWorks操作系统对于异常处理的流程,指出其中不适应于高可靠性嵌入式应用的地方,并提出了结合当前应用设计异常处理策略的改进优化方案,结合SPARC体系架构的TSC695F处理器,完成了异常处理改进方法并通过实验验证。实验结果表明,改进的异常处理方案大大提高了VxWorks运行的可靠性,本文的研究成果已应用于国家某重大项目。展开更多
基金Public research funding from“Fondi di Ricerca d’Ateneo ex 60%” and a ministerial doctoral grantfunds at the ISA Doctoral School,University of Bergamo,Department of Engineering and Applied Sciences (Dalmine)
文摘Output-only structural identification is developed by a refined Frequency Domain Decomposition（rFDD） approach, towards assessing current modal properties of heavy-damped buildings（in terms of identification challenge）, under strong ground motions. Structural responses from earthquake excitations are taken as input signals for the identification algorithm. A new dedicated computational procedure, based on coupled Chebyshev Type Ⅱ bandpass filters, is outlined for the effective estimation of natural frequencies, mode shapes and modal damping ratios. The identification technique is also coupled with a Gabor Wavelet Transform, resulting in an effective and self-contained time-frequency analysis framework. Simulated response signals generated by shear-type frames（with variable structural features） are used as a necessary validation condition. In this context use is made of a complete set of seismic records taken from the FEMA P695 database, i.e. all 44 ＂Far-Field＂（22 NS, 22 WE） earthquake signals. The modal estimates are statistically compared to their target values, proving the accuracy of the developed algorithm in providing prompt and accurate estimates of all current strong ground motion modal parameters. At this stage, such analysis tool may be employed for convenient application in the realm of Earthquake Engineering, towards potential Structural Health Monitoring and damage detection purposes.
文摘本文详细阐述了VxWorks for SPARC的异常处理机制,分析VxWorks操作系统对于异常处理的流程,指出其中不适应于高可靠性嵌入式应用的地方,并提出了结合当前应用设计异常处理策略的改进优化方案,结合SPARC体系架构的TSC695F处理器,完成了异常处理改进方法并通过实验验证。实验结果表明,改进的异常处理方案大大提高了VxWorks运行的可靠性,本文的研究成果已应用于国家某重大项目。
