000			02066nam a22001817a 4500
003			OSt
005			20160617154958.0
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040			_cNational Acoustic Laboratories
100			_aDuncan, Alec
245			_aMeasurements of underwater noise from the RV Investigator
520	3		_aAustralia's Marine National Facility, operated by CSIRO, has recently taken delivery of a new, $126 million, multi-purpose blue-water marine research vessel, RV Investigator. The ship is equipped with an extensive suite of active acoustic instrumentation that include an omnidirectional sonar, three multibeam echosounders, six split beam scientific echo sounders, two acoustic Doppler current profilers and a sub-bottom profiler. Permanently installed seismic compressors also prepare the ship to undertake geophysical survey missions. The ship has been designed to maximise the performance of these systems through innovative hull design to minimise air bubble entrainment under the acoustic transducers, and by reducing the underwater sound radiated from the ship through an innovative propulsion system, coupled with advanced isolation of vibration from the primary power generation machinery. This paper discusses some recent underwater noise measurements that were carried out in southern Tasmanian waters following Det Norske Veritas (DNV) guidelines in order to determine baseline underwater noise signatures for the vessel, and to characterise the noise performance of the various acoustic instruments. The baseline measurements obtained are compared to the ship's design criteria of DNV Silent-R and the expected background wind and thermal noise. The potential variability in vessel noise spectra obtained when following DNV noise measurement guidelines are also discussed.
700			_aRudy Kloser
700			_aMatthew Sherlock
773	0		_tAcoustics 2015 Hunter Valley 15-18 November 2015
856			_uhttp://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/392/p60.pdf?sequence=1&isAllowed=y
942			_2udc _cARTICLE
999			_c2584 _d2584