Effects of Wireless Sensor Network Uncertainties on Output-Only Modal Analysis Employing Merged Data of Multiple Tests

Nguyễn, Andy; Chan, Tommy H.T.; Thambiratnam, David

doi:10.1260/1369-4332.17.3.319

Cited by 23 publications

(24 citation statements)

References 15 publications

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“…However, as this option was prohibitively expensive for the system coverage required herein, the desire for inexpensive and flexible alternatives has triggered the promotion of alternative software-based solutions. The main bases for this direction are first that the main impact of DSE tends to be proportional to the DSE magnitude and the modal frequency value [9,14,17]. Second, the frequencies of interest for civil structures where the synchronization task often becomes more problematic are rather low and, for many cases (including the case considered herein), less than 10 Hz.…”

Section: Data Synchronization Solutionmentioning

confidence: 98%

Development of a cost-effective and flexible vibration DAQ system for long-term continuous structural health monitoring

Nguyễn

Chan

Thambiratnam

et al. 2015

Mechanical Systems and Signal Processing

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a b s t r a c tIn the structural health monitoring (SHM) field, long-term continuous vibration-based monitoring is becoming increasingly popular as this could keep track of the health status of structures during their service lives. However, implementing such a system is not always feasible due to on-going conflicts between budget constraints and the need of sophisticated systems to monitor real-world structures under their demanding in-service conditions. To address this problem, this paper presents a comprehensive development of a cost-effective and flexible vibration DAQ system for long-term continuous SHM of a newly constructed institutional complex with a special focus on the main building. First, selections of sensor type and sensor positions are scrutinized to overcome adversities such as low-frequency and low-level vibration measurements. In order to economically tackle the sparse measurement problem, a cost-optimized Ethernet-based peripheral DAQ model is first adopted to form the system skeleton. A combination of a high-resolution timing coordination method based on the TCP/IP command communication medium and a periodic system resynchronization strategy is then proposed to synchronize data from multiple distributed DAQ units. The results of both experimental evaluations and experimental-numerical verifications show that the proposed DAQ system in general and the data synchronization solution in particular work well and they can provide a promising cost-effective and flexible alternative for use in real-world SHM projects. Finally, the paper demonstrates simple but effective ways to make use of the developed monitoring system for long-term continuous structural health evaluation as well as to use the instrumented building herein as a multi-purpose benchmark structure for studying not only practical SHM problems but also synchronization related issues.

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Section: Data Synchronization Solutionmentioning

confidence: 98%

Development of a cost-effective and flexible vibration DAQ system for long-term continuous structural health monitoring

Nguyễn

Chan

Thambiratnam

et al. 2015

Mechanical Systems and Signal Processing

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“…The selection of projection channels starts with the selection of the channel that correlates the most with the others; in the case of sets of arrangements, the reference channels (those common to all the arrangements) are used as initial projection channels (Sampaio,[3]). Failure to do so may cause some modes to be detected as noise (Nguyen,[13]).…”

Section: Projection Channelsmentioning

confidence: 99%

Modal identification of Bridge 44 of the Carajás Railroad and numerical modeling using the finite element method

Silva

Neves

2020

Rev. IBRACON Estrut. Mater.

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Regular use and the effects of time can affect the behavior of a structure. Over time, problems such as the occurrence of small fissures, oxidation of steel elements, and excessive displacements at some points may arise in a structure. In this context, the monitoring of structures through experimental tests has gained more importance, because it allows for the identification of the dynamic characteristics (natural frequencies, mode shapes, and damping rate) of structures. The dynamic characteristics can be obtained through forced vibration tests, which are based on measuring the response of a structure subjected to an excitation of known magnitude, or through tests in which only the structural response is measured, such as free vibration and ambient vibration tests. The present study aims to identify the modal parameters of bridge 44 of the Carajás Railroad, using experimental data obtained on site by monitoring the vibration caused by a group of people jumping, and it compares them with the results obtained through numerical modeling performed using the finite element method, developed in CSiBridge. The modal parameters were obtained using the commercial software ARTeMIS Modal, and stochastic subspace identification was used for modal identification.

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“…The acceleration data was captured in the time domain and was conveyed to the ARTeMIS modal analysis software to retrieve modal parameters. The natural frequencies and mode shapes were determined by the Data Driven Stochastic Subspace Identification (SSI-DATA) in ARTeMIS modal analysis software 33 .…”

Section: (A) (B) (C)mentioning

confidence: 99%

Vibration-based dual-criteria approach for damage detection in arch bridges

Jayasundara

Thambiratnam

Chan

et al. 2019

Structural Health Monitoring

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Vibration characteristics of a structure can be used as an indication of its state of structural health as they vary if the structural health is affected by damage. This is the broad principle used in structural health monitoring for vibration-based damage detection of structures. Although most structures are built to have a long life span, they can incur damage due to many reasons. Early damage detection and appropriate retrofitting will enable the continued safe and efficient functioning of structures. This study develops and applies a dual-criteria method based on vibration characteristics to detect and locate damage in arch bridges. Steel arch bridges are one of the most aesthetically pleasing bridge types, which are reasonably popular in Australia and elsewhere. They exhibit three-dimensional and somewhat complex vibration characteristics that may not be suitable for traditional vibration-based damage detection methods. There have been relatively fewer studies on damage detection in these bridge types, and in particular the arch rib and struts, which are important structural components, have received little attention for damage detection. This study will address this research gap and treat the damage detection in the arch bridge structural components using the dual-criteria method to give unambiguous results. The proposed method is first validated by experimental data obtained from testing of a laboratory arch bridge model. The experimental results are also used to validate the modelling techniques and this is followed by damage detection studies on this bridge model as well as on a full-scale long-span arch bridge. Results demonstrate that the proposed dual-criteria method based on the two damage indices can detect and locate damage in the arch rib and vertical columns of deck-type arch bridges with considerable accuracy under a range of damage scenarios using only a few of the early modes of vibration.

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Effects of Wireless Sensor Network Uncertainties on Output-Only Modal Analysis Employing Merged Data of Multiple Tests

Cited by 23 publications

References 15 publications

Development of a cost-effective and flexible vibration DAQ system for long-term continuous structural health monitoring

Development of a cost-effective and flexible vibration DAQ system for long-term continuous structural health monitoring

Modal identification of Bridge 44 of the Carajás Railroad and numerical modeling using the finite element method

Vibration-based dual-criteria approach for damage detection in arch bridges

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