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Noise thrusters
The trend is towards LowNoise thrusters and
Brunvoll has shown the way.
Thruster noise is a major problem for crews.
The stress and discomfort it causes may threaten
both performance and safety on board.
Quieter manoeuvring means better sleep,
improving the alertness and efficiency of the crew.
Passengers enjoy a new degree of comfort.
Brunvoll introduced the LowNoise thruster in 1977.
Through four technological generations we have
refined our patented solutions into a proven concept.
Noise levels of 75-88 dB(A) are typical in cabins next
to and above conventional tunnel thrusters.
Brunvoll’s advanced technology can cut this by up to 15 dB(A).
Combined with other measures, noise reductions
of up to 20-25 dB(A) have been verified.
Brunvoll pioneered the LowNoise thruster in 1977.
Since then, we have continuously refined our solutions
into a proven concept.
Today, Brunvoll is recognized worldwide as the major
supplier of effective LowNoise solutions.
Brunvoll resilient mounting
11-15 db(A)
Double tunnel resilient mounting, acoustic
5-9 db(A)
short circuit at tunnel ends
Resilient mounting of mid-section
4-6 db(A)
Oversized thruster
2-3 db(A)
Tunnel design
1-3 db(A)
Air injection system
1-3 db(A)
Propeller blade design
1-2 db(A)
Variable speed drive
1-2 db(A)
Thruster noise control
Alternative source treatment
Noise reduction in full load range
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