Contribution
Post-Construction Subway Noise
* Presenting author
Abstract:
This paper presents case-studies of noise- and vibration levels inside buildings caused by a nearby subway line in Copenhagen. Buildings situated near subway lines are particularly susceptible to radiated noise from the building elements caused by vibrations when the subway cars pass-bys. The measurement method includes multiple microphones and accelerometers to simultaneously measure the vibrations and noise levels caused by the sub-way inside a room. Measuring multiple surfaces simultaneously allows for direct comparison of vibrations during pass-bys. The results reveal that it is possible to detect increased acceleration and sound pressure levels in certain frequency bands on several floors in the buildings close to the tunnels. Specifically, the most affected one-third octave bands fall within the 125-250Hz range. This observation is noteworthy as existing regulations in Denmark primarily address low-frequency noise up to 160Hz, suggesting a gap in current noise control standards. Thus, the research provides critical insights for future subway constructions, emphasizing the need for enhanced vibration mitigation strategies.