Noise effects of combinations of tyres and roads Gijsjan van - PowerPoint PPT Presentation

Noise effects of combinations of tyres and roads Gijsjan van Blokland �����������������������������������

Normal car tyres on smooth and rough 0/8 mm surface noise effect of tyre/road combi's 2 �����������������������������������

Normal car tyres on open and dense 0/8 mm surface noise effect of tyre/road combi's 3 �����������������������������������

Normal car tyres on open and on absorbing 0/8 mm surface noise effect of tyre/road combi's 4 �����������������������������������

Normal tyres on rigid and flexible layer noise effect of tyre/road combi's 5 �����������������������������������

All surface types noise effect of tyre/road combi's 6 �����������������������������������

Normal tyres on smooth surfaces 80 noise effect of tyre/road combi's v = 80 km/h 70 LpAF [dB] 60 "1 mm surface dressing 50 "0,5 mm surface dressing "polished concrete "'epoxy smoothened surface 40 5 0 0 0 5 0 0 0 0 x x 0 0 0 0 0 0 0 0 a a 2 6 0 5 1 0 0 3 0 0 5 0 0 0 5 0 0 m m 1 1 2 2 3 4 5 6 8 0 2 6 0 5 1 0 0 1 1 1 2 2 3 4 5 f f a a L L Frequency [Hz] 7 �����������������������������������

Smooth on rough surface vs. rough tyre on smooth surface noise effect of tyre/road combi's 80 v = 80 km/h 75 70 65 L pAF [dB] 60 55 50 normale reifen auf glatte decke (Planschliff) 45 glatte reifen auf normale belag (ob 2/3) 40 Lafmax Lafmax 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 f T [Hz] 8 �����������������������������������

Smooth/normal tyre on smooth/rough road 80 noise effect of tyre/road combi's 75 70 65 LAmax [dB] 60 55 normal tyre on coarse surface 50 normal tyres on smooth surface 45 slick tyre on coarse surface slick tyre on smooth surface 40 Lafmax Lafmax 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Frequency [Hz] 9 �����������������������������������