However, the WHIS®stone does this at least 30 years, without losing its effect or needing to be replaced every 7 years. Independent research has found that the WHIS®stone, a concrete diffractor placed directly next to the road at ground level realises the same amount of noise reduction solution as silent asphalt, 2.5 dB. Groundbreaking resultsĬan such a simple method, – no electricity or high constructions are needed, just a few cleverly placed grooves varying in depth – produce real results? The answer is yes. These waves ‘dodge’ the WHIS®stone’s waves by deflecting upwards.Ĥ.This happens at an angle of about 25 degrees, creating a quieter area behind the WHIS®stone. This leads to a resistance in the air, hindering the horizontally moving sound waves. Inside these grooves sound resonates, creating pressure.ģ. The horizontal sound waves meet the WHIS®stone: an element with grooves of varying depths. Traffic noise moves off the road horizontally.Ģ. As a result, the area behind it is much quieter. 4Silence’s diffractors make sound waves resonate in a grooved element, which ‘push’ other sound waves upwards. Therefore, when you create resonance beneath sound waves, the noise deflects upwards. Sound moves like water: it always seeks the path of the least resistance. How does this work? Astonishingly simply, and cleverly. Bending sound waves upwardsĪs a spin-off of the University of Twente, the Dutch innovators have taken a scientific principle called ‘diffraction’ and used it to develop noise reducing products that are cheaper, (socially) safer, more durable and more esthetic than current options. They have therefore developed a completely new method of traffic noise reduction. Other direct consequences include cardiovascular disease, slowed cognitive development in children, and tinnitus.ĤSilence, the company behind a new innovation in noise reduction, believes that no one should suffer from the population’s growing need for mobility, and negative effects such as noise disturbance. According to research by the World Health Organization, it leads to hazardous levels of stress and lack of sleep. With a perennially growing population and a matched growth in demand for mobility, traffic noise has become Europe’s second-largest environmental problem. A noise solution as simple as it is elegant. Dikes, windmills, dredging and now: noise reduction via diffraction. The Dutch know a thing or two about innovation. UK WHIS®wall trial at Transport for London Here, Bart Willems discusses the Dutch noise reduction solution using diffraction to decrease the impact on the environment
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