Application of MEMS accelerometer of smartphones to define natural frequencies and damping ratios obtained from concrete viaducts and footbridge

Braido, Jorge Dalmas; Pravia, Zacarias Martin Chamberlain

doi:10.1590/s1983-41952022000200006

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…The use of smartphone accelerometers has also been trialed in [10] to test walking-induced vibration in concrete floors and found the accuracy of smartphone accelerometers to be satisfactory for preliminary modal testing, though it was found to be highly dependent on the smartphone model. Authors in [11] and [12] also studied the use of smartphone MEMS sensors to extract bridge frequencies; the latter found 1% error in the first three frequencies and 3% in the fourth frequency compared to a highly sensitive wireless sensing network of 15 accelerometers.…”

Section: State Of the Artmentioning

confidence: 99%

Smartdynamics a Mobile Phone Application Designed for Bridge Structural Assessments

Hassani,

Teixeira

2024

J. Phys.: Conf. Ser.

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A mobile phone application, referred to as SMARTdynamics, was developed to take site readings of the dynamic response of a cable-stayed highway bridge and a three-span plate girder railway bridge by making use of built-in accelerometers. The application allows to determine key dynamic properties including natural frequencies, displacements, and damping ratios. SMARTdynamics includes a novel feature for smartphone accelerometers: the ability to control the sensor remotely with automated application feedback, allowing to record the dynamic response at specific times and with precision. The aim of the study was to determine the reliability of smartphone accelerometers, establish the effectiveness of mobile phone usage in the bridges and civil structures industry, and demonstrate that the derivation of more realistic dynamic properties can offer benefits in determining less conservative structural capacities. Acceleration readings were taken for a cable-stayed highway bridge to determine the tension force within the stay cables. The obtained results confirmed the viability of mobile phone ac-celerometers as a serious asset management tool. Site readings were also taken to determine the dynamic amplification factors of plate girder railway bridges and revealed a mean average reduction of 40% in the real dynamic increment factor when compared with values derived from codes of practice. The study confirmed that moving towards a realistic approach to bridge structural assessments with user-friendly and cost-effective tools can have tangible benefits and should be considered as a viable alternative to traditional methods.

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Section: State Of the Artmentioning

confidence: 99%

Smartdynamics a Mobile Phone Application Designed for Bridge Structural Assessments

Hassani,

Teixeira

2024

J. Phys.: Conf. Ser.

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“…The traditional systems are composed of acquisition boards and signal conditioners that offer the best performance to date, using analog sensors that offer high sensitivity and low signal noise. The most recent systems mainly pursue wireless solutions in order to eliminate interruptions to the structures' operations, as well as provide continuous and remote monitoring of the structure, as described in [9], [10]. It would be much less expensive to use low-cost sensors for this purpose that can remain fixed to or embedded in the structure (not recovered), as long as they offer acceptable performance and robustness.…”

Section: Introductionmentioning

confidence: 99%

Dynamic identification of a cable-stayed footbridge using a low-cost data acquisition system

Nunes

Brito

Doz

2023

Rev. IBRACON Estrut. Mater.

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This study describes the dynamic identification of a cable-stayed footbridge using an alternative data acquisition system and output-only modal identification methods. Data were collected during dynamic tests performed using an acquisition system based on the Arduino platform, consisting of low-cost devices with on-board Micro-Electro-Mechanical System (MEMS) accelerometers. The Peak-Picking (PP) method was used for the stay cables. The Frequency Domain Decomposition (FDD) and Stochastic Subspace Identification - Unweighted Principal Components (SSI-UPC) methods were used for the complete structure. The proposed data acquisition system efficiently recorded the time series required for Operational Modal Analysis and the acceleration acquisition process provided stable results. At least four mode shapes were identified in all tests. A minimum of four high energy peaks in the 0 - 24 Hz frequency range of the spectrum were obtained by the acquisition system in all of the cable tests and selected by the method. In the complete structure tests, the low-cost data acquisition system and the identification methods provided the first four flexural mode shapes, within the 0 - 9 Hz frequency range. Results for the frequency domain method showed a maximum difference of 2.37% in the first experimental frequency when compared to a 3D finite element numerical model, while in the other frequencies the difference was between 1 and 2%. For the time domain method, the maximum difference was 1.74% in the fourth frequency, with differences of between 0.1 and 0.7% in the other frequencies. The mode shapes were evaluated using the Modal Assurance Criterion (MAC) index, and the results varied between 0.8513 and 0.9990.

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Eigenfrequency analysis of bridges using a smartphone and a novel low-cost accelerometer prototype

Komarizadehasl,

Xia,

Komary

et al. 2024

Front. Struct. Civ. Eng.

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Application of MEMS accelerometer of smartphones to define natural frequencies and damping ratios obtained from concrete viaducts and footbridge

Cited by 5 publications

References 28 publications

Smartdynamics a Mobile Phone Application Designed for Bridge Structural Assessments

Smartdynamics a Mobile Phone Application Designed for Bridge Structural Assessments

Dynamic identification of a cable-stayed footbridge using a low-cost data acquisition system

Eigenfrequency analysis of bridges using a smartphone and a novel low-cost accelerometer prototype

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