PA-system at Dubai Metro station

Atkins is the lead designer for the Japanese-Turkish JV and the Dubai Rapid Link Consortium (DURL) for the design-build of the Red and Green Lines of the Dubai Metro. Part of the multidisciplinary commission includes specialist designs to meet the acoustic criteria so that audibility of the Public Address (PA) systems is achieved.
[1] The first two lines of the Dubai Metro comprise 74.5 km of track, 10 underground stations and 34 above-ground stations, three maintenance depots, three car parks and 4 km of bridges and entry pods all of which required acoustic studies. Atkins specialist acoustics division played a major role in the design and implementation of the station and depot design elements of the project.

Listen to the two auralisations below describing the acoustics with the PA-system design as it would have sounded if no acoustic panelling had been added in the metro station and as it will sound with proper sound absorption in the ceiling.

[2] Digital modelling and simulation of various station entrances, platforms and concourse areas throughout the system allowed for accurate PA/voice alarm system design to be integrated .

Listen to the two auralisations below describing the acoustics with the PA-system design as it would have sounded if no acoustic panelling had been added in the metro station and as it will sound with proper sound absorption in the ceiling.

[3] A key concept in the acoustic design was the “intelligibility” prediction which involves a synthesis of inter-related factors. The key elements of success to the design of the PA system were achieving appropriate reverberation times, speaker coverage, sound pressure level, speech intelligibility and selection and placement of absorbing materials.

Listen to the two auralisations below describing the acoustics with the PA-system design as it would have sounded if no acoustic panelling had been added in the metro station and as it will sound with proper sound absorption in the ceiling.

[4] Contract compliant performance values for speech intelligibility were required to be achieved throughout all areas. To reach the requirements, it was important that ceiling materials and coverage were correctly specified in order to maintain appropriate reverberation times, sound pressure levels, and consequently, speech intelligibility levels. Sound pressure level coverage was also a major consideration in the selection and locating of speakers.

Listen to the two auralisations below describing the acoustics with the PA-system design as it would have sounded if no acoustic panelling had been added in the metro station and as it will sound with proper sound absorption in the ceiling.

[5] Outputs from the digital models included material performances, area coverage, locations and quantities of speakers, directivity patterns and tapping settings.

Listen to the two auralisations below describing the acoustics with the PA-system design as it would have sounded if no acoustic panelling had been added in the metro station and as it will sound with proper sound absorption in the ceiling.