ABSTRACT
The 1929 Old Årsta bridge in central Stockholm (Sweden), owned and operated by the Swedish Transport Administration(Trafikverket), is a monumental structure of architectural value and infrastructural importance to the city. Following recent renovation work, an increase of train noise was observed. Hence, the Swedish Transport Administration decided to mitigate the noise. A multi-step project was defined to this end. The present paper presents the findings of the pre-study, the purpose of which was to investigate the noise radiation from the bridge. This involved vibro-acoustic modelling by Statistical Energy Analysis (SEA), laboratory testing of various Constrained Layer Damping (CLD) configurations at different temperatures, as well as sim ilar CLD tests on a mock-up, noise and vibration measurements on the actual bridge, and acoustical beamforming measurements.
