Phase errors in accelerometer arrays: An analysis based on collocated sensors and FEM

Moschas, Fanis; Mouzoulas, Dimitris; Stiros, Stathis C.

doi:10.1016/j.soildyn.2015.07.001

Cited by 7 publications

(1 citation statement)

References 48 publications

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“…In this case, the differences between sensors define the precision while the differences between sensors' output and the input reference signal define accuracy of each sensor (cf. Moschas et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Uncertainty and bias in electronic tide-gauge records: Evidence from collocated sensors

2018

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Understanding noise and possible bias in tide-gauge sensors is important for determining the mean sea level, its fluctuations and their climatic, geophysical and engineering implications, but not an easy task. In the past, this problem has been examined through comparison of different sensors in the laboratory, or through correlations of neighbouring sensors. In this study we identified and studied 10 cases of harbours with fully collocated sensors. Transient differences were found between collocated records. Pressure gauges were found significantly more sensitive to noise than radar-type sensors, and with higher chances of long-term transient bias. The amplitude of the observed bias is important, of the same order of magnitude with tsunami waves in the open sea and with seismic ground displacements. Only 9% of the sensors analysed were found to satisfy the 1 cm accuracy criterion imposed by the Permanent Service for Mean Sea Level (PSMSL).

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Section: Methodsmentioning

confidence: 99%

Uncertainty and bias in electronic tide-gauge records: Evidence from collocated sensors

2018

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Vibration detection with 100 Hz GPS PVAT during a dynamic flight

Bischof

Schön

2017

Advances in Space Research

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Analysis of the dynamic response of a long span bridge using GPS/accelerometer/anemometer under typhoon loading

Han

Wang

Meng

et al. 2016

Engineering Structures

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(2016) Analysis of the dynamic response of a long span bridge using GPS/accelerometer/anemometer under typhoon loading. Engineering Structures, 122 (2016 A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Analysis of the dynamic response of a long span bridge using GPS/accelerometer/anemometer under typhoon loading AbstractLarge flexible engineering structures, such as long span bridges or tall buildings, are susceptible to quasi-static and dynamic deformations caused by different loading situations, thus accurate displacement measurements are desirable to assess the integrity and reliability of the structure. In this study, an integrated system that includes Global Positioning System (GPS), accelerometer and anemometer was developed to obtain the responses of a long span bridge to the extreme wind loading. Spectral analysis based on the Fast Fourier Transform (FFT) algorithm was first carried out to detect the dominant frequencies of the bridge. Then the noisy GPS displacement measurements and accelerometer data are de-noised using the Vondrak filter, and the low frequency disturbance was separated from GPS displacement time series. A least-squares based displacement reconstruction scheme using noise-mitigated accelerations was employed, and the Tikhonov regularization scheme with optimal selected regularization factor was used to alleviate the ill-posedness. At last, an adaptive recursive least squares (RLS) filter was adopted to separate the slow-varying movements, and the total displacement with enhanced measurement accuracy was obtained from the combined quasistatic and high-frequency dynamic displacements. A field monitoring data set collected on the Erqi Yangtze River Bridge, a three-tower cable-stayed bridge located in Wuhan in China, was used to validate the effectiveness of the proposed integration processing scheme. The GPS/accelerometer/anemometer installed on the center supporting tower was used to characterize the interaction between the responses and the ambient wind loadings. The results demonstrate the proposed technique can significantly improve the measurement accuracy of bridge displacement under strong winds. The deformation with the amplitude of several millimeters can be successfully detected, and the spectrum of the bridge response obtained from both GPS data and accelerometer data reveals the identified first natural frequency of the bridge is 0.172 Hz.

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Phase errors in accelerometer arrays: An analysis based on collocated sensors and FEM

Cited by 7 publications

References 48 publications

Uncertainty and bias in electronic tide-gauge records: Evidence from collocated sensors

Uncertainty and bias in electronic tide-gauge records: Evidence from collocated sensors

Vibration detection with 100 Hz GPS PVAT during a dynamic flight

Analysis of the dynamic response of a long span bridge using GPS/accelerometer/anemometer under typhoon loading

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