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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 75
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and Z. Bittnar
Paper 54
An Inverse Identification Method from Dynamic Tests with Measurement Uncertainties P. Feissel+, O. Allix+ and P. Thévenet*
+Laboratory of Mechanics and Technology, ENS Cachan, France
Full Bibliographic Reference for this paper
, "An Inverse Identification Method from Dynamic Tests with Measurement Uncertainties", in B.H.V. Topping, Z. Bittnar, (Editors), "Proceedings of the Sixth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 54, 2002. doi:10.4203/ccp.75.54
Keywords: dynamics, measurement uncertainties, localization, inverse problem, identification.
Summary
The purpose of this study is the prediction of the crash behavior
of multi-layered composites. The simulation of tests performed on
such absorbing materials involves several difficulties:
Here, we will be focusing on the first aspect. The dynamic tests we are considering are dynamic compression tests on laminated plates based on Split Hopkinson Pressure Bar principle. These lead to imprecise measurements of forces and velocities. Thus, Problem (2) is encountered from the very beginning of the identification process. Then, the question which comes to mind is: How can one formulate an identification problem in dynamics in such a way that the results would be accurate in spite of the great measurement uncertainties?
Our guiding principle, which was directly inspired by studies on
model updating in vibration [1], is to verify exactly,
during the identification process, the properties which are
considered to be reliable. The uncertain quantities are then taken
into account by minimizing a modified constitutive
relation error [2]. In this first work [3], we are
considering the simple problem of an elastic rod with
redundant displacement and force conditions at both ends, denoted
under the conditions:
One can note that the boundary conditions
Work is currently underway to extend this method to elastic damage behavior, including the possibility of damage localization. References
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