Triple A Tyres for Cost-effective Noise Reduction in Europe

Tyre-road noise is still a major and growing issue in Europe. A recent study performed in The Netherlands for the Dutch Ministry of Infrastructure and Environment examined the benefits of widescale introduction of high quality labeled tyres, with ‘Triple A’ rating for rolling resistance, wet grip and noise. Two scenarios were investigated, one...

Reduction of Impact Noise of Trams on a Major Bridge

As part of a recent renovation of the Erasmus bridge in Rotterdam, improvements were made to reduce impact noise caused by trams passing a series of rai! joints. The bridge inciudes several different sections inciuding a bascule bridge and is in an inner city tocation with new adjacent apartment buildings. At request of public transport company...

Future impact of road and railway noise

An exploratory study bas been undertaken to put into perspective future impact of road and railway noise until 2050 in The Netherlands, taking into account potential economic and mobitity growth, noise policy and legislation, demography and technical progress. Estimates were made of average noise levels and numbers of annoyed and sleep disturbed...

Active noise control with fast array recursive least squares filters using a parallel implementation for numerical stability

Noise reduction in feedforward active noise control systems with a rapidly changing primary path requires rapid convergence and fast tracking. This can be accomplished with a fast-array Kalman method which uses an efficient rotation matrix technique to calculate the filter parameters. However, finite precision effects lead to unstable behavior....