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Evaluation of the accuracy of an impact load cell using lumped parameter modeling and analysis

Ranadive, Gauri and Deb, Anindya (2012) Evaluation of the accuracy of an impact load cell using lumped parameter modeling and analysis. In: 2012 4th International Conference on Computer modeling and simulation (ICCMS 2012), 17th to 18th February 2012 , Hong Kong, China.

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The objective of the current study is to evaluate the fidelity of load cell reading during impact testing in a drop-weight impactor using lumped parameter modeling. For the most common configuration of a moving impactor-load cell system in which dynamic load is transferred from the impactor head to the load cell, a quantitative assessment is made of the possible discrepancy that can result in load cell response. A 3-DOF (degrees-of-freedom) LPM (lumped parameter model) is considered to represent a given impact testing set-up. In this model, a test specimen in the form of a steel hat section similar to front rails of cars is represented by a nonlinear spring while the load cell is assumed to behave in a linear manner due to its high stiffness. Assuming a given load-displacement response obtained in an actual test as the true behavior of the specimen, the numerical solution of the governing differential equations following an implicit time integration scheme is shown to yield an excellent reproduction of the mechanical behavior of the specimen thereby confirming the accuracy of the numerical approach. The spring representing the load cell, however,predicts a response that qualitatively matches the assumed load-displacement response of the test specimen with a perceptibly lower magnitude of load.

Item Type: Conference Paper
Publisher: IACSIT Press
Additional Information: Copyright of this article belongs to IACSIT Press.
Department/Centre: Division of Mechanical Sciences > Centre for Product Design & Manufacturing
Date Deposited: 12 Mar 2014 12:33
Last Modified: 12 Mar 2014 12:33
URI: http://eprints.iisc.ac.in/id/eprint/48611

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