Ambient vibration tests of a historical masonry bridge by means of radar interferometry

Camassa, Domenico; Castellano, Anna; Fraddosio, Aguinaldo; Silla, Michela; Piccioni, Mario Daniele

doi:10.1109/metrolivenv54405.2022.9826977

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…Regarding to the dynamic excitation of masonry constructions, which generally have a considerable historical and artistic value, Operational Modal Analysis (OMA), which only involves ambient loads (wind, vehicular and pedestrian traffic), is considered the most suitable modal testing technique since it does not cause any risk of damage. Several works exploit ambient loads for modal testing by radar interferometry on towers (Atzeni et al, 2010) and bridges (Camassa et al, 2022). Anyway, depending on the mass and stiffness of the structure, natural excitations may induce very low structural vibration, which results in radar signals with low SNR.…”

Section: Dynamic Excitationmentioning

confidence: 99%

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Camassa

Vaiana

Castellano

2023

Front. Built Environ.

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Modal testing is one of the most effective experimental techniques for the structural health monitoring of masonry constructions, as it provides useful information for the calibration of structural models and for the assessment of structural damage. However, the application of modal testing to masonry constructions is sometimes hindered by the complexity of the conventional experimental set-up, which is generally based on contact sensors. In order to overcome this issue, several researchers are exploring the application of the ground-based radar interferometry, which is an increasingly popular measurement technique for remotely monitoring displacement and vibration of structures. Given the recently increasing number of articles on this subject, here we propose a mini review on the most significant works dealing with the application of ground-based radar interferometry for modal testing of masonry constructions. In particular, we show the current state of the art and highlight the main research gaps with the purpose of assessing the effectiveness of ground-based radar interferometry for the structural health monitoring of these constructions. Our mini review is primarily aimed at engineers and scientists who already know about modal testing and radar interferometry technique and are interested in the specific application to masonry constructions.

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Section: Dynamic Excitationmentioning

confidence: 99%

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Camassa

Vaiana

Castellano

2023

Front. Built Environ.

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“…Inside, the tower houses a helical staircase. In order to remove the vibration of the IBIS sensor, a monoaxial piezoelectric accelerometer (PCB Piezotronics 393B05) was installed on the radar [7]. In this way it was possible to measure the vibration of the instrument, which was then subtracted from the vibration of the structure detected by the radar during the tests.…”

Section: A Case Study: San Cataldo's Lighthouse In Barimentioning

confidence: 99%

“…Figure 1 San Cataldo's lighthouse in BariThe interferometric radar tests are carried out with an IBIS-FS system[7] consisting of a sensor module for generating, transmitting and receiving electromagnetic signals using different kind of antennas pair, and a PC for managing the tests and storing the signals (Figure2).…”

mentioning

confidence: 99%

Dynamic damage identification of masonry lighthouse by radar interferometry technique

Camassa¹,

Castellano²,

Chiapperino³

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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Our work addresses the capability of the radar interferometry technique to identify the dynamic behavior of an historical masonry lighthouse.To achieve this goal, we have performed a campaign of ambient vibration tests for characterizing the dynamic properties of the San Cataldo's lighthouse located in Bari using ground-based radar interferometry. Moreover, the experimental results were used to calibrate a numerical approach for the assessment of structural damage. Indeed, by analyzing five different damage scenarios, the ability of the radar interferometry technique to identify each damage was investigated.

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“…To reduce the influence of noise on clutter estimation and deformation inversion, the traditional method is to perform low-pass filtering on the original vibration radar signal shown in Equation (10). However, the low-pass filtering method requires a high PRF.…”

Section: Clutter Suppression and Deformation Inversion Based On Perio...mentioning

confidence: 99%

“…Piraccini et al developed and tested the first radar system for bridge dynamic monitoring in 2004 [8]. The University of Florence and IDS (Ingegneria dei Sistemi SpA) collaborated to develop the IBIS series of systems in 2007 [9], one of which, the IBIS-S system, became widely used for infrastructure vibration monitoring [1,3,5,10,11]. This system operates in the Ku band with a power of 40 W. Vibration radar systems have improved in recent years.…”

Section: Introductionmentioning

confidence: 99%

Periodic-Filtering Method for Low-SNR Vibration Radar Signal

et al. 2023

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Radar is a non-contact, high-precision vibration measurement device and an important tool for bridge vibration monitoring. Vibration information needs to be extracted from the radar phase, but the radar phase information is sensitive to noise. Under low signal-to-noise ratio (SNR) data acquisition conditions, such as low radar transmission power or a long observation distance, differential phase jump errors occur and clutter estimation becomes difficult, which leads to inaccurate inversion of vibration deformation. Traditional low-pass filtering methods can filter out noise to improve SNR, but they require oversampling. The sampling rate needs to be several times higher than the Doppler bandwidth, which is several times higher than the vibration frequency. This puts high data acquisition requirements on radar systems and causes large data volumes. Therefore, this paper proposes a novel vibration signal filtering method called the periodic filtering method. The method uses the periodicity feature of vibration signals for filtering without oversampling. This paper derives the time-domain and frequency-domain expressions for the periodic filter and presents a deformation inversion process based on them. The process involves extracting the vibration frequency in the Doppler domain, suppressing noise through periodic filtering, estimating clutter using circle fitting on the data complex plane, and inverting final deformation with differential phase. The method is verified through simulation experiments, calibration experiments, and bridge vibration experiments. The results show that the new periodic filtering method can improve the SNR by five times, resolve differential phase jumps, and accurately estimate clutter, thus getting submillimeter-level vibration deformation at low SNR.

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Ambient vibration tests of a historical masonry bridge by means of radar interferometry

Cited by 8 publications

References 17 publications

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Dynamic damage identification of masonry lighthouse by radar interferometry technique

Periodic-Filtering Method for Low-SNR Vibration Radar Signal

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