An automatic approach towards modal parameter estimation for high-rise buildings of multicomponent signals under ambient excitations via filter-free Random Decrement Technique

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• 作者：Fatima Nasser^a ; ^{fatima.nasser@gipsa-lab.grenoble-inp.fr" class="auth_mail" title="E-mail the corresponding author} ; Zhongyang Li^a ; ^{zhong-yang.li@gipsa-lab.grenoble-inp.fr" class="auth_mail" title="E-mail the corresponding author} ; Nadine Martin^a ; ^{nadine.martin@gipsa-lab.grenoble-inp.fr" class="auth_mail" title="E-mail the corresponding author} ; Philippe Gueguen^b ; ^{Pilippe.gueguen@obs.ujf-grenoble.fr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Automatic modal analysis ; Ambient vibrations ; Random Decrement Technique ; Damping ratios ; Closely spaced frequency
• 刊名：Mechanical Systems and Signal Processing
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：70-71
• 期：Complete
• 页码：821-831
• 全文大小：739 K

文摘

This paper proposes an automatic modal analysis approach for signals of high-rise buildings recorded under real-world ambient excitations. The fact of working over such type of signals is faced with several challenges: the time-domain convolution between the system impulse response and the seismic noise, the existence of several components, the presence of closely-spaced frequency modes, with high additive noises, and low, exponential and damped amplitudes. The proposed approach handles these challenges simultaneously without the need for a user intervention. It is based on a filter-free Random Decrement Technique to estimate the free-decay response, followed by a spectral-based method for a rough modal estimate and finalized by a Maximum-Likelihood Estimation process to refine the modal estimates. Each of these processes is responsible to tackle one or more of the aforementioned challenges in the aim to provide an automatic and moreover a reliable modal analysis of the studied signals.