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Any piece of a structure that vibrates, radiates acoustic energy. Sound power is the rate at which energy is radiated. The result is sound pressure. Sound pressure is what we hear, or measure with a microphone. M.A.C.E., Inc. can perform regular sound pressure ( level ) measurements, sound analysis and sound intensity measurements.

Sound intensity measurements

Traditional, to measure sound power, the noise source had to be placed in special constructed
rooms such as anechoic or reverberant chambers. Sound intensity, however, can be measured in any sound field. No assumptions need to be made.
This property allows all measurements to be done directly in Situ and measurements on individual machines or individual components can be made even when all the others are radiating noise because sound intensity gives a measure of direction as well as magnitude. It is very useful when locating sources of sound like failure in insulation or measurement of wall transmission paths.

The picture to the left shows the grid of a loud speaker system and it's energy distribution at a special frequency.

Vector displays of the intensity data helps us to characterize sound fields and the direction of the intensity.

Sound level measurements

For acceptance- and verification tests and more important for human protection. Too high of a sound pressure may cause hearing damage.
IMO's CODE ON NOISE

Cabin and Hospitals 60 dB(A)
Mess / Recreation Rooms 65 dB(A)
Offices 65 dB(A)
Radio Rooms 60 dB(A)
Wheel House 65 dB(A)
Bridge Wings 70 dB(A)
Engine Room 110 dB(A)
Control Room 75 dB(A)
Work Shop 85 dB(A)
Spaces not Specified 90 dB(A)