Frequency loci veering in deformed rotating tyres

R.R.J.J. van Doorn, I. Lopez, R. Steen, van der, N.B. Roozen, H. Nijmeijer

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In previous work [1] a methodology to model tyre vibrations has been developed, which exploits a modal basedetermined in a standard FE package and includes rotational effects by a coordinate transformation. In thepresent paper, the effect of rotation on the eigenfrequencies of a deformed tyre is examined. It is well-knownthat rotation splits the eigenfrequencies of an undeformed tyre symmetrically around the eigenfrequencies ofthe non-rotating tyre, where the slope of the eigenfrequency-lines is determined by the circumferential wavenumber and tyre radius only. However, the eigenfrequency-lines of a deformed tyre demonstrate a fascinatingmutual repulsion behaviour if the velocity is increased. This phenomenon is known as frequency loci veeringand is induced by the a-periodicity resulting from the tyre deformation. Besides the effect of veering on theeigenfrequencies, the corresponding eigenmodes interact in the transition zones and finally interchange. Theeffects of veering are extremely intensified by the high modal density of the tyre structure, which results in adecreasing eigenfrequency distribution when the rotational velocity increases.[1] I. Lopez et al, JSV 307, 481-494, (2007)
Original languageEnglish
Title of host publicationEuronoise 2008
Place of PublicationFrance, Paris
Publication statusPublished - 2008


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