Jump to content
Image of Årstabron
Quietly Improving Your Environment

Constrained Layer Damping on Old Steel Bridge

Vibratec reduces noise on the Årsta bridge in central Stockholm. Using a techninque called constrained Layer Dampening (CLD). Noise lowered with 6 dB.

After a recent renovation of the 1929 Årsta bridge in Stockholm an increase of noise was observed. Vibratec Akustikprodukter AB has been awarded a multi-step project to mitigate the noise by use of constrained layer damping (CLD).

Step one is to investigate the noise radiation from the bridge structure, and the partial contributions from deck, girders, wheel/rail contact etc. This involve vibro-acoustic modelling by Statistical Energy Analysis (SEA), lab testing of various CLD configurations at different temperatures, as well as similar CLD tests on a mock-up plus noise and vibration measurements on the actual bridge.

Our film about how we dampened noise from commuter trains using Constrained Layer Dampening.

Interested in Constrained Layer Damping?

Feel free to contact us for more information

Contact us

News

News archive
Vibratec's flexible floor bracket VT-FFB for constructing elastic, floating floors, in markets where timber joists are 45 mm in thickness. This bracket comes in two versions depending on the size of your floor joists.
  • Construction
  • Infrastructure
  • Industrial

Lower build height, greater flexibility – Flexible Floor Bracket VT-FFB

A new, lower version of the Flexible Floor Bracket VT-FFB is now available, making it possible to construct floating floor systems using 45 × 45 mm timber joists.

Image of recording studio
  • Construction
  • Infrastructure
  • Industrial

Creating optimal acoustic environments – the “room-in-room” concept

The room in room concept is widely used in environments such as recording studios, rehearsal spaces, and other sound-sensitive rooms.

Image of logo for Dansk Akustisk Selskap
  • Exhibitions

Vibratec at Day of Acoustics 2026

On March 10, the acoustics community gathers in Odense for Day of Acoustics 2026, hosted by Dansk Akustisk Selskab.

Image of final inspection of Vibratec's AVMs
  • Offshore

Final inspection completed for offshore AVMs

Today, Bureau Veritas made the final inspection of the final three sets offshore AVMs for Siemens Energy, an important milestone ahead of delivery.

Image of oil platform
  • Offshore

AVMs 37 years in offshore – now under condition survey

In 1989, Vibratec delivered three sets of AVM to the offshore platform Snorre A. Each set consisted of three AVMs supporting a gas turbine with total weight 119 tonnes.

Image of heavy lifting area at Kääriku Spordibaas
  • Construction

Stronger foundations for heavier lifts 

The legendary training facilities atKääriku Spordibaashave been renovated — including the heavy lifting area, built to handle extreme loads and repeated impact.

News Archive