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Advances in Acoustics and Vibration
Volume 2017, Article ID 8572674, 9 pages
https://doi.org/10.1155/2017/8572674
Research Article

Dynamic Modal Correlation of an Automotive Rear Subframe, with Particular Reference to the Modelling of Welded Joints

1MilleChili Lab, Department of Engineering “Enzo Ferrari”, Università degli Studi di Modena e Reggio Emilia, Via Vivarelli 10, 41124 Modena, Italy
2Ferrari S.p.A, Via Abetone Inferiore 4, 41053 Modena, Italy

Correspondence should be addressed to Sara Mantovani; ti.erominu@inavotnam.aras

Received 20 December 2016; Revised 27 February 2017; Accepted 8 March 2017; Published 3 April 2017

Academic Editor: Marc Thomas

Copyright © 2017 Vincenzo Rotondella et al. 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

This paper presents a comparison between the experimental investigation and the Finite Element (FE) modal analysis of an automotive rear subframe. A modal correlation between the experimental data and the forecasts is performed. The present numerical model constitutes a predictive methodology able to forecast the experimental dynamic behaviour of the structure. The actual structure is excited with impact hammers and the modal response of the subframe is collected and evaluated by the PolyMAX algorithm. Both the FE model and the structural performance of the subframe are defined according to the Ferrari S.p.A. internal regulations. In addition, a novel modelling technique for welded joints is proposed that represents an extension of ACM2 approach, formulated for spot weld joints in dynamic analysis. Therefore, the Modal Assurance Criterion (MAC) is considered the optimal comparison index for the numerical-experimental correlation. In conclusion, a good numerical-experimental agreement from 50 Hz up to 500 Hz has been achieved by monitoring various dynamic parameters such as the natural frequencies, the mode shapes, and frequency response functions (FRFs) of the structure that represent a validation of this FE model for structural dynamic applications.