Ground effects and tyre / road contact noise: Influence of the absorption on pass-by noise levels

François-Xavier Bécot (1) , J. Clairet (1)

1 INRETS/LTE - Laboratoire Transport et Environnement

Technical details on the measurements performed for the present study can be found in "Effet dièdre sur plan réflecteur et sur surface absorbante - Descriptif des mesures", report LTE n°0414 (Fr), by J-M. Clairet and F-X. Bécot. The present work deals with the influence of the road absorption on the prediction of pass-by noise levels using hybrid methods. First, the context of the present work is recalled. Objectives and milestones are given. In a second part, the determination of the acoustic properties of some material is tackled. Two complementary methods are used for this: tube measurements and level difference measurements. Results using the two techniques are compared and discussed. In a third part, the sound amplification due to the horn effect is characterized experimentally. Situations with a long cylinder and with a single tyre placed over a rigid or an absorbing surface are examined. Measurement results are compared to predictions using two-dimensional models for the tyre radiation. Finally, the horn effect for twin wheels over a rigid surface is measured and discussed. SILVIA code: SILVIA-INRETS-014-00-WP2-3/9/2004

Mots clés: Acoustic; tyre noise; absorption; measures; horn effect; impedance tube; level differences; twin–wheel tyres

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

François-Xavier Bécot, J. Clairet. Ground effects and tyre / road contact noise: Influence of the absorption on pass-by noise levels. 2004, 136p. ⟨hal-00546240⟩