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Shock and Vibration
Volume 5 (1998), Issue 4, Pages 255-265
http://dx.doi.org/10.1155/1998/513249

Evaluation of Accelerometer Mechanical Filters on Submerged Cylinders Near an Underwater Explosion

G. Yiannakopoulos and P.J. van der Schaaf

Defence Science and Technology Organisation, Aeronautical and Maritime Research Laboratory, GPO Box 4331, Melbourne, Victoria 3001, Australia

Received 30 May 1997; Revised 10 September 1998

Copyright © 1998 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An accelerometer, mounted to a structure near an explosion to measure elasto-plastic deformation, can be excited at its resonant frequency by impulsive stresses transmitted within the structure. This results in spurious high peak acceleration levels that can be much higher than acceleration levels from the explosion itself. The spurious signals also have higher frequencies than the underlying signal from the explosion and can be removed by a low pass filter. This report assesses the performance of four accelerometer and filter assemblies. The assessment involves measurements of the response of a mild steel cylinder to an underwater explosion, in which each assembly is mounted onto the interior surface of the cylinder. Three assemblies utilise a piezoresistive accelerometer in which isolation is provided mechanically. In the fourth assembly, a piezoelectric accelerometer, with a built-in filter, incorporates both mechanical and electronic filtering. This assembly is found to be more suitable because of its secure mounting arrangement, ease of use, robustness and noise free results.