Modal Identification through Ambient Vibration: Comparative Study

Giraldo, Diego; Song, Wei; Dyke, Shirley J.; Caicedo, Juan M.

doi:10.1061/(asce)0733-9399(2009)135:8(759)

Cited by 82 publications

(44 citation statements)

References 9 publications

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“…NExT method was proposed by James et al [36] to estimate and extract the response (a free-decay one) produced broadband dynamic excitations using the acquired response samples. It presents a slightly improved capability to deal better with noisy signals, which allows obtaining better free-decay responses unlike random decrement technique [37]. For this reason, NExT method has been employed in this work and in several applications, such as health monitoring [38][39][40].…”

Section: Methodsmentioning

confidence: 99%

A Two-Step Strategy for System Identification of Civil Structures for Structural Health Monitoring Using Wavelet Transform and Genetic Algorithms

et al. 2017

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Nowadays, the accurate identification of natural frequencies and damping ratios play an important role in smart civil engineering, since they can be used for seismic design, vibration control, and condition assessment, among others. To achieve it in practical way, it is required to instrument the structure and apply techniques which are able to deal with noise-corrupted and non-linear signals, as they are common features in real-life civil structures. In this article, a two-step strategy is proposed for performing accurate modal parameters identification in an automated manner. In the first step, it is obtained and decomposed the measured signals using the natural excitation technique and the synchrosqueezed wavelet transform, respectively. Then, the second step estimates the modal parameters by solving an optimization problem employing a genetic algorithm-based approach, where the micropopulation concept is used to improve the speed convergence as well as the accuracy of the estimated values. The accuracy and effectiveness of the proposal are tested using both the simulated response of a benchmark structure and the measurements of a real eight-story building. The obtained results show that the proposed strategy can estimate the modal parameters accurately, indicating than the proposal can be considered as an alternative to perform the abovementioned task.

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Section: Methodsmentioning

confidence: 99%

A Two-Step Strategy for System Identification of Civil Structures for Structural Health Monitoring Using Wavelet Transform and Genetic Algorithms

et al. 2017

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“…This methodology has gained popularity among researchers in the last few years due to its relatively simple application. Giraldo et al [35] compared the SSI with other output only identification methodologies, finding that the SSI performs as well as or better than other well known algorithms and requires fewer parameters and less experience to set up. Consider a time-invariant system described by the equations…”

Section: Modal Identificationmentioning

confidence: 99%

“…True frequencies are detected based on the consistency through all the windows. An automated recognition system was used to detect the true poles from those created by noise and numerical errors [35,43]. True poles are recognized by identifying parameters within some specific characteristics.…”

Section: Modal Identificationmentioning

confidence: 99%

Finite element model updating: Multiple alternatives

Zárate¹,

Caicedo²

2008

Engineering Structures

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107

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“…The modal properties of a structure can be estimated from records of vibrations generated by different sources in the environment [1], [2], [3], [4]. The recorded dynamic response is representative of the measuring conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Tall Building Identified from Earthquake and Ambient Vibration Records

Andone

Demetriu

Aldea

2015

Mathematical Modelling in Civil Engineering

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Abstract:The paper presents the modal characteristics of a tall building in Bucharest (BRD-SG Tower) identified from earthquake and ambient vibration records. The building was built in the early 2000's and has a reinforced concrete structure (inner shear wall tube and perimeter frames) with 3 underground stories, ground floor and 18 stories. The seismic instrumentation of the building consists of a seismic station with two triaxial acceleration sensors located at the top of the building (+69.6 m) and at the third basement (-9.3 m). The dynamic characteristics of the building are estimated from the seismic records from 23 earthquakes (with moment magnitudes M W between 3.7 and 6.0) that occurred during the period 2004÷2010. The results obtained from the earthquake records are compared with those obtained from 35 ambient vibration records from the period 2003 ÷ 2010.

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Modal Identification through Ambient Vibration: Comparative Study

Cited by 82 publications

References 9 publications

A Two-Step Strategy for System Identification of Civil Structures for Structural Health Monitoring Using Wavelet Transform and Genetic Algorithms

A Two-Step Strategy for System Identification of Civil Structures for Structural Health Monitoring Using Wavelet Transform and Genetic Algorithms

Finite element model updating: Multiple alternatives

Dynamic Characteristics of a Tall Building Identified from Earthquake and Ambient Vibration Records

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