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Descripción
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| In this work a blasting seismograph was tested on a vibration shaker controlled by a single-point laser Doppler vibrometer (LDV). A total of 43 tests were made to measure the transfer properties (transmissibility and phase shift) of the basic elements of the full monitoring chain and investigate the performance of the full system. The main elements of the seismograph are described by second order transfer functions with typical parameters calibrated through nonlinear fit of the measured responses. The resulting transfer function is used to compare the behavior of the tested seismograph with four theoretical seismographs representative of those used in blasting. Fifteen theoretical inputs are run through the transfer function of each seismograph to assess their steady-response. The error (expressed as gain) in the peak velocity has been assessed. It varies from -1.5 to 2.3 dB (equivalent to a transmissibility of 0.84 to 1.3, respectively) depending on the seismograph and frequencies of the input. The largest errors occurred for input signals with frequencies in the low (<32 Hz) or high ranges (>125 Hz), where the mechanical, electronics and digital parts of the seismograph modify the signals. Seismographs with the nominal transfer function described by DIN 45669:1:2010 are ranked with the smallest errors. Monitoring devices with transmissibility around one in a narrow bandwidth, in line with ISEE suggested criteria for amplitude response, involve large phase shifts at low and high frequencies, resulting in a worst performance. | |
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Internacional
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Si |
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Nombre congreso
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43rd Annual Conference on Explosives and Blasting Technique |
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Tipo de participación
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960 |
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Lugar del congreso
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Orlando, Florida |
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Revisores
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Si |
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ISBN o ISSN
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99-99999-99-9 |
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DOI
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Fecha inicio congreso
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29/01/2017 |
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Fecha fin congreso
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01/02/2017 |
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Desde la página
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635 |
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Hasta la página
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645 |
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Título de las actas
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Proceedings of the 43rd Annual Conference on Explosives and Blasting Technique |