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Memorias de investigación
Communications at congresses:
Effect of Vibration Sensor Mounting Method on the Quality of Vibration Measurements
Year:2015
Research Areas
  • Engineering
Information
Abstract
This work investigates some suggested methods for blast vibration monitoring on a hard surface based on 53 tests on a vibration exciter. Errors in the measurement attributable to coupling have been described as function of frequency by the rock-to-mount (or coupling) transmissibility ?ie ratio of the velocity of the vibration sensor mount to the velocity of the rock motion. Transmissibility has been measured from 2 to 200 Hz, at two vibration levels (5 and 20 mm/s), in four seismographs. Attachment methods with an anchor, thermal adhesive and gypsum plaster, allow stiff rock-to-mount-coupling. They ensure accurate measurements (errors below 0.3 dB) for frequencies commonly found in blasting (below 100 Hz) irrespective of the mount characteristics and the vibration level. Free laid mounts and sandbagged vibration sensors lead generally to a poor, weak coupling. Errors are non linear errors with the input velocity ?ie the operating frequency window narrows as the velocity of the ground increases. Free mounts follow ground motion acceptably well (error up to 0.4 dB) at both vibration levels and frequencies below 15 Hz. At higher frequencies, free mounts lead to the largest distortions with expected errors ranging from 0.8 to 6.6 dB. Sandbagging limits the expected errors below 1.3 dB, but it does not prevent large errors that can be up to 4.5 dB. In these conditions both frequency and velocity should be considered together to assess the measurement errors instead of the expected accelerations as it is currently made.
International
Si
Congress
11th International Symposium on Rock Fragmentation by Blasting
960
Place
Sidney, Australia
Reviewers
Si
ISBN/ISSN
978-1-925100327
Start Date
24/08/2015
End Date
26/08/2015
From page
545
To page
551
Proceedings of the 11th International Symposium on Rock Fragmentation by Blasting
Participants
  • Autor: Pablo Segarra Catasus (UPM)
  • Autor: Jose Angel Sanchidrian Blanco (UPM)
  • Autor: Ricardo Castedo Ruiz (UPM)
  • Autor: Lina Maria Lopez Sanchez (UPM)
  • Autor: Iván del Castillo (Vibraquipo)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería de Georrecursos y Modelización
  • Departamento: Ingeniería Geológica y Minera
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