Acoustical Properties of Marine Floors

Ønvestigation of the acoustical properties of marine floors is a key area of expertise of the ODS Marine Group.

We have developed state-of-the- art computational tools and rest methods to fully support our customers in the marine industry.

We support our customers in developing marine floors, which are acoustically optimised according to the different applications onboard, e.g. open deck, cabin, galley, discoteque, or above engine room.

Acoustic test of a floor in the laboratory, More information about the laboratory can be seen at www.dat.dtu.dk/revrooms.htm

• Prediction of the sound insulation properties at the design stage
• Design assistance with respect to optimisation of the
  acoustical performance
• Laboratory test of floor material properties (Ex: Loss factor test)
• Acoustical test of complete floors in the laboratory
• Field test of the acoustical properties of a floor mounted
  in the ship
• Preparation of acoustical data sheets of floors

Test in the ODS laboratory of the acoustical properties of a
standard beam specimen containing a viscoelastic layer
for improvement of the sound insulation properties.

Acoustic Parameters

Investigation of the acoustical properties of marine floors is a key area of expertise of the ODS Marine Group.

We have developed state-of-the- art computational tools and rest methods to fully support our customers in the marine industry.

We support our customers in developing marine floors, which
are acoustically optimised according to the different applica-
tions onboard, e.g. open deck, cabin, galley, discoteque, or
above engine room.

Sound Reduction Index, R R describes the sound insulation of the floor and is used for predicting the air-borne sound reduction between the underside of the deck and the area above, or vice versa.

Normalised Impact Sound Pressure, Ln Ln describes the impact sound pressure level in a room below the deck and is used for evaluating the reduction of noise provided by a floor or a suspended ceiling, or both, caused by walking people and human activity.

Transmission Loss TLv TL describes the difference between the velocity level measured on the deck after installation of the floating floor, and the velocity level measured on the floating floor.

Insertion Loss ILv ILv describes the difference between the velocity level measured on the deck before installation of the floating floor or other type of floor, and the velocity level measured on the floor after it has been installed.

Radiation Ratio 10*logo The radiation ration 10*logσ describes the ability of the floor to radiate sound. Therefore, a high radiation index, in general terms, means a high noise level and vice versa.

We have developed a standard data sheet format for marketing of the acoustical properties of the floors. The LOGO of ØDS supports the sales process by the floor maker, because ØDS is a wellknown specialist company in the marine industry.

Field test of the acoustical properties of a floor mounted in the ship The very low noise level on moderne passenger ships incereases the need for high sound insulation performance. ODS often do field tests and trouble shooting onboard.