Impact force reconstruction on a concrete deck using a deconvolution approach

Publication Type:
Conference Proceeding
8th Australasian Congress on Applied Mechanics, ACAM 2014, as Part of Engineers Australia Convention 2014, 2014, pp. 763 - 771
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In this study, impact force history applied to a steel-reinforced concrete deck has been reconstructed based on vibration response signals collected at random positions from the impact location. A deconvolution technique in time domain utilizing the responses recorded, from piezoelectric (PZT) sensors and accelerometers are used to reconstruct the impact force. As the deconvolution is an ill-conditioned inverse problem, the truncated singular value decomposition (TSVD) and the Tikhonov regularization are used to regularize the problem. The effect of different attachment methods of the PZTs/accelerometers on the structure is investigated including the use of Blu-tack and the 5-minnutes Araldite. It is found that with the use of the Blu-tack, the reconstructed force is not predicted precisely which can be attributed to the nonlinear behaviour of the Blu-tack. In addition, the effect of the location of the measurement point on quality of reconstructed impact force is investigated. It is found that when the measurement location is very close to the impact site, there is no need to use the regularization techniques and the pseudo-inverse method can provide acceptable results.
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