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•Thehullplatinginfrontofthetransducermustbeassmoothaspossible.
Important
Beespeciallyawareofbilgekeelsandzincalloyanodes.Thekeelmustberoundedoff
withoutsharpedges.Neitherextrudingobjectsnorabrupttransitionsmustbepresent.
•Thefairingaroundtheinstallationtrunkmustbestreamlined.
•Thetransducermustbeprotrudingfarenoughdowntoreachoutoftheboundarylayer.
Reducingmachinerynoise
•Thehullunitmustbeinstalledfarawayfromtheengineroom.
•Themainengineandrelevantauxiliaryenginesandequipmentmustbexedtorigid
foundationstoavoidvibrations.
•Anyhullstructurethatmayvibrateshouldbedampedorcoatedtoreducethe
vibrations.
Theuseofshockabsorbersoroatingraftsmaysometimesreducethisnoise.The
structure-bornenoisemaybereducedbyisolation,forexamplebyprovidingvibration
clampingbetweenthetransducerandthehullstructure.
Reducingpropellernoise
•Thehullunitmustbeinstalledfarawayfromthepropellers.
•Sufcientclearancebetweenthepropellersandthehull,therudderandthekeelmust
beprovided.
•Placethezincalloyanodesinplaceswherethewaterowistheleastdisturbed.
•Ensurethatthepropellersbladesarecorrectlydesignedandwithoutdamages.
•Theuseofabafebetweenthepropellersandthetransducermayreducenoise
appreciably.
•Staticdischargescausedbytherotatingpropellershaftmayberemovedbyproper
groundingorbymountingacoalbrushfromtheshafttovesselground.
Reducingrattlenoise
Ensurethatnopartsnearthetransducerscanrattleasaresultofwateroworvibrations.
Reducinginterference
Interferencefromthetransmissionpulsesfromotherhydroacousticinstrumentson
boardthevesselisdifculttoavoid.Theproblemmaybereducedbychoosingthe
workingfrequenciescarefullyandtosomeextentbyseparatingthedifferenttransducers.
Onvesselswithalargenumberofseparatehydroacousticsystemsinstalledandin
simultaneoususe,aseparatesynchronizingsystem(forexampletheK-Sync)should
beconsidered.
Preparations
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