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Relation between tyre/road noise and ice and snow friction of winter tyres

机译：轮胎/道路噪音与冬季轮胎冰雪摩擦的关系

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It is often assumed that low noise emission from car tyres implies a sacrifice of frictional properties. This study explores the relation between tyre/road noise with friction coefficients on ice and snow surfaces for a number of winter tyres, designed either for central European or for Nordic winter roads. Measurements of noise were made by the coast-by method in accordance with the EU regulation on a test track having an ISO surface. Measurements of ice friction were made on a long straight climate controlled indoor test track in Sweden which was covered by ice. Snow friction tests were made with a car braking on an outdoor test track in northern Finland. Ten different tyres were tested for all the conditions. The results show that the correlation between noise levels and ice friction coefficients is consistently negative, which means that tyres having lower noise have higher friction. The tested tyres ranked with respect to noise in this order (from high to low noise level): summer tyres, tyres designed for central Europe winter roads, and tyres designed for Nordic winter roads. The relation between noise level and friction on snow was less clear, but it was obvious that the summer tyres were much worse than the winter tyres. It is concluded that the design principles for winter tyres at large are favourable also for achieving low noise emission.
机译：通常假设汽车轮胎的低噪音发射意味着摩擦性能的牺牲。本研究探讨了轮胎/道路噪声与冰雪表面上的摩擦系数之间的关系，为欧洲中央欧洲或北欧冬季道路设计。根据具有ISO表面的测试轨道的欧盟法规，通过沿着欧盟的调节进行噪声测量。在瑞典的长直行气候控制室内测试轨道上进行了冰摩擦的测量，冰覆盖。在芬兰北部的室外测试轨道上用汽车制动进行了雪摩擦试验。所有条件都测试了十种不同的轮胎。结果表明，噪声水平和冰摩擦系数之间的相关性始终是阴性的，这意味着具有较低噪声的轮胎具有更高的摩擦力。经过测试的轮胎在此订单（高到低噪声水平）上的噪音排名：夏季轮胎，为中欧冬季道路设计的轮胎，以及为北欧冬季道路设计的轮胎。噪音水平与雪堆之间的关系较小，但很明显夏季轮胎比冬季轮胎要差。得出结论，冬季轮胎的设计原则也有利于实现低噪音发射。

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