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The Acoustic and Mechanical Engineering Laboratory (LEAM UPC) developed a system for controlling vibrations generated by underground trains. The system involves the use of dynamic vibration absorbers in the L9 tunnel of Transports Metropolitans de Barcelona (TMB). Dynamic vibration absorbers (DVAs) absorb vibrational energy in the system they are coupled to.

They are passive elements that require no maintenance or power and are optimised for a certain frequency range. Their main advantage is their low cost and ease of installation compared to other systems for controlling vibrations on an existing line. While the functioning of DVAs is well understood, their application in a rail tunnel was a pioneering project. Innovative modelling tools needed to be developed to facilitate their application in this environment. The new system will reduce the vibrations that the line produces by 6–8 dB, depending on the conditions in each case.