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A waveguide finite element aided analysis of the wave field on a stationary tyre, not in contact with the ground

Patrick Sabiniarz (Institutionen för bygg- och miljöteknik, Teknisk akustik) ; Wolfgang Kropp (Institutionen för bygg- och miljöteknik, Teknisk akustik)
Journal of Sound and Vibration (0022-460X). Vol. 329 (2010), 15, p. 3041-3064.
[Artikel, refereegranskad vetenskaplig]

Although tyre/road noise has been a research subject for more than three decades, there is still no consensus in the literature as to which waves on a tyre are mainly responsible for the radiation of sound during rolling. Even the free vibrational behaviour of a stationary (non-rotating) tyre, not in contact with the ground, is still not well understood in the mid- and high-frequency ranges. Thus, gaining an improved understanding of this behaviour is a natural first step towards illuminating the question of which waves on a rolling tyre contribute to sound radiation. This is the topic of the present paper, in which a model based on the waveguide finite element method (WFEM) is used to study free wave propagation, on a stationary tyre, in the range 0-1500 Hz. In the low-frequency region (0-300 Hz), wave propagation is found to be rather straightforward, with two main wave-types present. Both have cross-section modes involving a nearly rigid motion of the belt. For higher frequencies (300-1500 Hz) the behaviour is more complex, including phenomena such as 'curve veering' and waves for which the phase speed and group speed have opposite signs. Wave-types identified in this region include (i) waves involving mainly sidewall deformation, (ii) belt bending waves, (iii) a wave with significant extensional deformation of the central belt region and (iv) a wave with a 'breathing' cross-section mode. The phase speed corresponding to found waves is computed and their radiation efficiency is discussed, assuming free-field conditions. In a future publication, the tyre model will be used in conjunction with a contact model and a radiation model to investigate the contribution of these waves to radiated sound during rolling. (C) 2010 Elsevier Ltd. All rights reserved.

Nyckelord: VIBRATION, TIRES, MODEL, COMPUTATION, SMOOTH, SOUND



Denna post skapades 2010-06-03. Senast ändrad 2015-01-08.
CPL Pubid: 122284

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Teknisk akustik

Ämnesområden

Teknisk fysik

Chalmers infrastruktur