Rolling noise is noise caused by the contact between a wheel and the road surface or rails. Rolling noise is the main cause of noise pollution for both road and rail traffic. At low speeds, road and traffic dominates the noise of the exhaust and engine.
Both for cars and for trains, the noise increases dramatically with speed. The increase in decibels is globally proportional to 20 log v, where v is the speed. That is, each doubling of speed is accompanied by a 6 dB sound boost. Car noise
Vehicle rolling noise arises because the rubber band of the car is distorted when rolling over the road. This causes the tire to vibrate and will radiate this sound. The radiated noise depends on the roughness of the road, of the type of tire (especially the profile and width of the tire). Finally, the degree of absorption of the sound by the road is important. Rolling noise on trains The brake pads of a Mat '64 train consist of 5 smaller blocks
Trains rolling noise is caused by both the steel wheel and the rails shaking in vibration and shining sound. Should the rails and the wheel be completely smooth, this rolling noise would not occur. Due to the small roughness of the surface of wheel and rails (called roughness) these vibrations arise. Trains with a brake system consisting of cast iron brake pads pushing the wheelbelt have significantly more rugged wheels than trains that have a different brake system, such as a disc brake, electric or electrodynamic brake. Modern passenger trains are often provided with such a braking system in the Netherlands. At high speed (140 km / h) these trains are therefore 8 decibels quieter than trains with a brake pad. At low speed the difference is much smaller. Modern passenger trains drive quieter but have a smaller tread. As a result, the track detection can not function properly, which can lead to security problems. Track breaks also occur more often due to poorer distribution of weight over the width of the track head.
The railways can also be smoother by grinding with a special grinding train. However, this does not make sense if there are trains with rough wheels, such as freight trains. In 2003, there is little insight in the Netherlands that freight trains will also be provided with a quiet brake system, mainly because of the international character of freight transport. Due to the marital gains made on freight, there is also little money available. Whistle train
The Dolomite shuttle between Veendam and the Belgian Hemalle will cause less noise in the context of the 'Fluistertrein' project in the coming years. The whistle train has wheel dampers, low-noise wheels and plastic brake pads that do not cause unevenness to the wheels.
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