Simrad EK80 - Page 56

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Atmoderateshipspeedsthemachinerynoiseisusuallydominant.Atmediumspeedsthe
ownoiseincreasesmorerapidlyandtakesover,whileathigherspeedthepropellernoise
willbethemaincontributor.
Note
Theinformationheremustbeconsideredasgeneraladvice.EachEK80installationmustbe
handledseparatelydependingonthehulldesignandtheotherelectricalandmechanical
systemsinstalledonthevessel.
Reducingownoise
(CD010499_001_001)
•Theshapeofthetransducer(ordomearoundit)must
beasstreamlinedaspossible.
•Thehullplatinginfrontofthetransducermustbeas
smoothaspossible.Beespeciallyawareofbilgekeels
andzincalloyanodes.Thekeelshouldberounded
offwithoutsharpedges.
Important
Noextrudingobjectsoranyabrupttransitionsshould
appear.
•Echosoundertransducershouldbemountedwithasmallinclinationangle(approximately
2degrees).
Reducingmachinerynoise
•Thetransducer(s)mustbeinstalledasfarawayfromtheengineroomaspossible.
•Themainengineandrelevantauxiliaryenginesandequipmentshouldbexedtorigid
foundationstoavoidvibrations.Useofshockabsorbersoroatingraftsmaysometimes
reducethisnoise.
•Anyhullstructurethatmayvibrateshouldbedampedorcoatedtoreducethevibrations.
•Thestructure-bornenoisemaybereducedbyisolation,forexamplebyproviding
vibrationclampingbetweenthetransducerandthehullstructure.
Reducingpropellernoise
•Thetransducershouldbeinstalledasfarawayfromthepropellersaspossible.
•Sufcientclearancebetweenthepropellersandthehull,therudderandthekeelshouldbe
provided.
SimradEK80