Manufacturing Technology 2020, 20(1):84-91 | DOI: 10.21062/mft.2020.013

Modal Analysis of the Tubular Space Frame of a Formula Student Race Car

Attila Schweighardt, Balázs Vehovszky, Dániel Feszty
Audi Hungaria Faculty of Automotive Engineering, Department of Whole Vehicle Engineering, Széchenyi István University. Egyetem tér 1, H-9026 Győr. Hungary.

This document presents the characterization of the dynamic mechanical properties of a racecar's frame. First, it introduces the applicability of modal analysis, then the modal analysis of a lightweight vehicle chassis will be detailed, which is the focal point of this paper. This analysis was performed to determine some of the modal parameters, in order to reduce the noise of the vehicle, the probability of a component failure and to improve the comfort. The simulation part of the applied analysis was based on dynamic FEM (Finite Element Method). The measurement part of it was based on measuring the FRFs (Frequency Response Functions), with the help of accelerometers fixed at the nodes of the frame. The excitation signals were provided by a shaker connected to the chassis. In order to provide good quality results, the processing and evaluation of the simulated and measured data has to be done properly, which is discussed in detail. However, one dominant factor of a modal analysis is to find the optimal measurement setup. For this reason, the details of the measurement setup will be included. Hence one of the goals was to improve the coherence curves of the FRFs. Thanks to the presented techniques, the coherence curves managed to be improved and the results of the simulation and the measurement were found to be in good agreement.

Keywords: Acoustics, Modal Analysis, Eigenmode, Eigenfrequency, Coherence
Grants and funding:

The project titled "Internationalisation, initiatives to establish a new source of researchers and graduates, and development of knowledge and technological transfer as instruments of intelligent specialisations at Széchenyi István University" (project number: EFOP-3.6.1-16-2016-00017).

Prepublished online: July 31, 2020; Published: August 6, 2020  Show citation

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Schweighardt A, Vehovszky B, Feszty D. Modal Analysis of the Tubular Space Frame of a Formula Student Race Car. Manufacturing Technology. 2020;20(1):84-91. doi: 10.21062/mft.2020.013.
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