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An approach for assessing the accuracy of accelerometer responses during axial impact tests

Ranadive, G and Deb, A (2012) An approach for assessing the accuracy of accelerometer responses during axial impact tests. In: International Conference on Noise and Vibration Engineering (ISMA) / International Conference on Uncertainty in Structural Dynamics (USD), SEP 17-19, 2012, KU Leuven, Dept Mech Engn, Leuven, BELGIUM, pp. 1491-1504.

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The primary objective of the present study is to show that for the most common configuration of an impactor system, the accelerometer cannot exactly reproduce the dynamic response of a specimen subjected to impact loading. An equivalent Lumped Parameter Model (LPM) of the given impactor set-up has been formulated for assessing the accuracy of an accelerometer mounted in a drop-weight impactor set-up for an axially loaded specimen. A specimen under the impact loading is represented by a non-linear spring of varying stiffness, while the accelerometer is assumed to behave in a linear manner due to its high stiffness. Specimens made of steel, aluminium and fibre-reinforced composite (FRC) are used in the present study. Assuming the force-displacement response obtained in an actual impact test to be the true behaviour of the test specimen, a suitable numerical approach has been used to solve the governing non-linear differential equations of a three degrees-of-freedom (DOF) system in a piece-wise linear manner. The numerical solution of the governing differential equations following an explicit time integration scheme yields an excellent reproduction of the mechanical behaviour of the specimen, consequently confirming the accuracy of the numerical approach. However, the spring representing the accelerometer predicts a response that qualitatively matches the assumed force-displacement response of the test specimen with a perceptibly lower magnitude of load.

Item Type: Conference Proceedings
Additional Information: Copyright for this article belongs to KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE
Department/Centre: Division of Mechanical Sciences > Centre for Product Design & Manufacturing
Date Deposited: 16 Sep 2013 08:18
Last Modified: 16 Sep 2013 08:18
URI: http://eprints.iisc.ac.in/id/eprint/47104

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