However, the procurement program was too far
along to implement the floating superstructure, and
resilient mounting the propulsion diesels seemed
fruitless. These changes would have an unacceptable
impact on space, schedule and cost. With the magnitude
of the expected noise excesses, the only other option was
the installation of floating rooms in the receiver spaces.
A floating room consists of resiliently attached finish
surfaces on both the floor and bulkheads [8]. When
properly designed and installed, resiliently attached
surfaces are capable of reducing the A-weighted noise by
approximately 15 dB. This type of treatment provides
an effective airborne and structureborne noise reduction.
The performance is typically limited by the stiffness of
the entrapped air under the false deck and the number of
vibration short circuits created during the installation.