Getzner offers mass-spring systems to mitigate the vibration and noise generated by urban train operations. Presently, this system is installed in over 40 cities across the globe, including the Indian cities of Bengaluru, Delhi, Lucknow and Mumbai. Train operations generate vibration energy in the track superstructure because of high dynamic loads. This vibration energy propagates through the ground and once it reaches a building, it can be perceived as vibrations or be heard as secondary airborne noise, adversely impacting the lives of people in the vicinity of metro corridors. The effect of the vibration and noise is different in every building depending on its structural characteristics.
The goal of mass-spring systems is to elastically decouple the track superstructure from its surroundings in order to reduce the transmission of vibrations. These mass-spring systems deploy high quality microcellular polyurethane materials – Sylomer and Sylodyn – which guarantee the long-term performance of the mass-spring system. Till date, Getzner has supplied more than 450 mass-spring systems worldwide and all of them have been performing effectively in the last 40 years without any need for maintenance or replacement.
Depending on the economic and technical requirements of customers, Getzner offers three types of mass-spring systems – full surface, strip bearing and point (discrete) bearing. Full surface mass-spring systems have been supplied for projects in Delhi, Bengaluru, Lucknow and Mumbai. These systems are the most cost-effective as they are easy to construct and deliver long-term performance. With a full surface mass-spring system, a natural frequency in the range of 14-25 Hz can be achieved.