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Road surface and tyre interaction: noise and rolling resistance Tiago Vieira Workshop – Swedish Node in Nordic Research School for Pavement Engineering

Stockholm, 24th of September 2018

Why are noise and rolling resistance relevant?

•  World Health Organization:

•  Noise correlated to: •  Ischaemic heart diseases •  High blood pressure •  Sleep disturbance •  Cognitive impairment in children

(WHO, 2011)

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Image: mostphotos.se

Why are noise and rolling resistance relevant?

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Photo: Katja Kircher

•  Rolling resistance •  Fuel consumption •  11.5 % of the energy obtained from fuel is

dissipated in the tyre-road contact

Within the Swedish Context

Why are noise and rolling resistance relevant?

•  2018-2029: Noise reduction for 100 000

people resulting from pavement- and rail

related improvements

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A contact system: The pavement

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Image: Persson 2006

A contact system: Tyre

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Image: Gent, Walter, 2005

Image: Gent, Walter, 2005

Image: Gent, Walter, 2005

Tyre-road noise

•  16 different mechanisms •  9 generation mechanisms •  7 amplification mechanisms

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Tyre/road Noise and Rolling Resistance measurement

Effect of winter tyres on noise and rolling resistance?

•  SMA 8 •  Proxy for reference surface ISO 10844 •  Surface Texture: Mean Profile Depth (MPD): 0.78 mm •  In service road near Gdańsk, Poland

Road Surface S1

•  DAC 16 •  Similar to SMA 16 •  Surface Texture: Mean Profile Depth (MPD): 1.09 mm •  In service road near Gdańsk, Poland

Road Surface S2

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•  Noise Spectra:

Effect of winter tyres on noise and rolling resistance?

•  Studded tyres differ from other categories specially at higher frequencies (> 4 kHz)

•  Studded tyres have higher third-octave band levels all over the frequency range

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Texture optimization: Surface grinding

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•  Lack of holistic view •  PM-emissions •  Road Noise •  Rolling Resistance •  Friction

•  E.g.: •  Porous surfaces clog due to abrasion wear (road dust)

compromising its noise reduction ability •  Reducing maximum aggregate size reduces rolling resistance while

increasing abrasion wear, thus impacting particle emissions

Current problem

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Thank you for your attention!

Tiago Vieira tiago.vieira@vti.se

Supervision: Prof. Sigurdur Erlingsson (VTI/KTH/University of Iceland)

Dr. Ulf Sandberg (VTI) Dr. Anders Genell (VTI)

Sponsorship: