Railways are a source of environmental noise. Authorities have started to set statutory limits for rail traffic noise. Lucchini RS has invested in new R&D projects to understand the causes and engineer solutions.
The first step was to setup a Vibro-Acoustic laboratory, this is fully equipped to study the structural vibration leading to the radiation of sound. A semi-anechoic chamber was designed, built and tested. This has a solid floor rather than an absorbent surface in a full chamber.
The laboratory is equipped with a multi-channel sound and vibration acquisition system for performing sound analysis and structural modal analysis in the chamber and also track side. ISO 3095 specifies measurement methods and conditions to obtain reproducible and comparable exterior noise emission levels.
The aim of the projects is to help understand the vibro-acoustic phenomena of wheels on rails and to develop innovative methods for reducing wheel noise emission. There is a need to compare a standard wheel to a damped one in controlled conditions, to measure the improvement. These tests can be carried out at the train design stage rather than when the train is in service. Customers can choose the best solution at an early stage.
Lucchini RS has already developed a range of solutions to reduce the noise pollution:
Syope® For solid wheels mounted under passenger coaches and high-speed vehicles
Syope® Braw For solid wheels with web mounted discs brakes
Galene® For resilient wheels to reduce squealing noise
Hypno® For freight wheelsets with block-braked wheels
There is more information on the Lucchini RS Group website