PSI - Issue 37

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 37 (2022) 73–80

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract This work aims to study the dynamic behaviour of a passenger bus. The transportation sector demands high important technological improvements, strived for high safety standards and environmental sustainability. In this work, a simplified dynamic model of a single body bus is introduced to determine the natural frequencies spectrum variation, mainly caused by the induction of the flexible behaviour of the suspension and unforeseen external loads, particularly wind gusts. More complex vibrational modes have been studied via Finite Element Method (FEM) modelling. A significantly simplified link arrangement is presented, which models the behaviour between the road and tire contact as well as the suspension features. This deformation model leads to a combined stiffness matrix with the whole model. As a result, an acceptable agreement was obtained amongst the numerical and analytical solutions. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Type your keywords here, separated by semicolons ; 1. Introduction Modernization largely depends on the citizens’ mobility, being an incentive for professional activities when developed under sustainable platforms (Miller et al. 2016). The majority of worldwide city halls’ coordination staff encourages people to use public transportation instead of private vehicles. One detail, possibly not noticed by the majority of people, is that a bus fleet running in an active urban environment lends to the city aesthetics look an attractive complement, not only for a successful design but for also when the shiny lateral bus wall reflects the city profile, working as a mobile urbanistic icon. However, buses transport people, hence exigent safety and comfort attributes for a health and safe transportation must be inherent to the bus body design (Göhlich et al. 2018). Given the time dependent load system applied to the bus body, it is imperative to check the structural integrity for its dynamic behavior upon transient loads, starting by evaluating the natural frequencies and corresponding associate natural 2 t ns.org/licen ICSI 2021 The 4th International Conference on Structural Integrity Numerical and Theoretical Modal Analysis of Transit Buses Rogério Lopes*, Behzad V. Farahani, Francisco Q. de Melo, Nuno V. Ramos, Pedro M. G. P. Moreira INEGI, Institute of Science and Innovation in Mechanical Engineering and Industrial Engineering, Campus da FEUP, R. Dr. Roberto Frias 400, 4200-465 Porto, Portugal.

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.061