Title: Harmonic response analysis and research of bus body based on the modal shapes

Authors: Qin Shi; Tao Wang; Hongling Li

Addresses: Hefei University of Technology, Hefei 230009, China. ' Hefei University of Technology, Hefei 230009, China. ' Hefei University of Technology, Hefei 230009, China

Abstract: The finite element model of the bus body is built in ANSYS software, and the finite element model was validated by stress tests. The mode shapes and the natural frequencies of the bus body determine its dynamic response properties, such as the transmission of vibration from the engine. The modal analysis is performed by using the ANSYS. Through the preliminary analysis of the modal shape and frequency of the bus body, it was deduced that the second-order excitation of engine may be the root cause of the bus body vibration at idle. The inertia force and moment are calculated by the simulation formula and bus engine parameters. The results are used as the engine idle excitation inputs, then the harmonic response analysis is carried out. The modal analysis is verified by the harmonic response analysis of the sample bus. According to the modal analysis of the finite element model of bus body and the harmonic response of sample bus it is concluded that the second-order excitation of the engine is the excitation source of the bus body vibration at idle. The results of the research provide a design method of bus body and some measures are proposed for designers to improve design reliability and reduce vibration for a new bus.

Keywords: bus body vibration; buses; finite element method; modelling; natural frequency; modal shape; ANSYS; vehicle vibration; engine; idle; modal analysis; harmonic response analysis; stress tests; simulation; bus vibration; bus body design; bus design; design reliability.

DOI: 10.1504/IJVNV.2011.042423

International Journal of Vehicle Noise and Vibration, 2011 Vol.7 No.3, pp.253 - 270

Available online: 10 Sep 2011 *

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