PhD student develops device to combat noise

01 December 2009 

Johan Wesselink of the University of Twente has developed a device to actively combat noise nuisance. This invention curtails sound waves and vibrations by producing anti-noise. The researcher is confident that his device will be used in the transport and industrial sectors within a matter of years. He will defend his thesis on 26 November 2009 at the Faculty of Electrical Engineering, Mathematics and Computer Science.

The increase in air, road and rail traffic is leading to a build-up of noise nuisance. The consequences of such nuisance cannot be underestimated: in addition to possible hearing damage, people can end up suffering from lack of sleep, inability to concentrate, nervous conditions and high blood pressure. Johan Wesselink of the University of Twente has developed a device to combat noise nuisance. The device uses microphones to capture sound and can curtail sound waves by producing anti-noise through loudspeakers. This is achieved by means of a rapid-response algorithm, implemented efficiently using specially developed hardware.

Active and passive anti-noise strategies
Johan Wesselink's device combats noise actively. The passive approach to combating noise has been with us for a while. It involves building noise barriers or fitting soundproofing materials, often resulting in an increase in the bulk and weight of the object being soundproofed. Johan hopes that his device will one day replace all those thick layers of insulation. One effect will be to decrease the weight of motor vehicles, thereby reducing their fuel consumption.

Applications
TNO Research Institute is currently investigating the practical applicability of Johan's system. It is now being tested on navy frigates, canal barges, extractor fans, heavy goods vehicles and optical precision equipment. The system can also be used to reduce the noise made by MRI scanners.

Note to the press:
Johan Wesselink will defend his thesis on 26 November 2009 at the Faculty of Electrical Engineering, Mathematics and Computer Science. He conducted his research at the Signals and Systems department, under the supervision of Prof. Kees Slump and Dr Arthur Berkhoff. His thesis A rapid prototyping system for broadband multichannel active noise and vibration control will be available on request in digital form, following the ceremony.
Contact for the press: Rianne Wanders, +31 (0)53 4892721.