2010 RVOC Annual Meeting Noise Control and Abatement

45 Pages·2010·3.16 MB·English

by  Erin Jackson

Acoustic Desiggn,, Construction and
Testing of Fisheries Research Vessels
One dark and
stormy day…..
The End
Rayy Fischer
Noise Control Engineering Inc.
nnoonnooiissee@@nnooiissee-ccoonnttrrooll.ccoomm
April 2010
FFRRVV AAccoouussttiicc DDeessiiggnn - OOvveerrvviieeww
• ICES sppec – narrow band v TOB ((measurement
procedure)
• Lessons learned
•• NNCC aapppprrooaacchh –
– N&V Control Plan – Schedule, approach, deliverables
– Detail design – CAD, accuracy
– Treatment optimization – trade-offs
– Design changes - evaluation
•• SShhiippyyaarrdd TTrraaiinniinngg
• QA
• Testingg
April 2010
NNCCEE EExxppeerriieennccee - IICCEESS
• NNOOAAAA FFRRVV-4400 ((44 ddeelliivveerreedd))
• Univ. of Delaware – R/V HUGH R SHARP
• MMaacchhiinneerryy tteesstt aanndd oovveerrssiiddee tteesstt– GGOO SSAARRSS
• Machinery test – JAMES COOK
•• RReevviieewweedd DDeessiiggnneerr NNOOIISSEE mmooddeell ooff SSppaanniisshh
FRV
•• AARRRRVV –– PPrreelliimmiinnaarryy DDeessiiggnn && UUAAFF aaggeenntt
• RCRV – Preliminary Design
•• TTaaiiwwaann RReesseeaarrcchh VVeesssseell
April 2010
IICCEESS LLiimmiitt
These 2 curves are
equivalent!!!!!
ICES Radaited Noise Requirement - 11 kts
160
Minimize fish
150
reaction
140
m
1 130
@
a
P
o However measurements are done
r
c
mim 120 iin tthhiirdd-octtave bbandds per IICCEESS
1
e
r
B
d 110
p
L ICES Third Octave Band
100
ICES Narrow Band
Sonar
90
Performance
80
10 100 1000 10000 100000
Freq (Hz)
April 2010
Source Quality Inspection
NOISE
Levels Control Procedure
PROCESS Ship
DDesiign TTreattmentt
FLOW DIAGRAM
Information Design/
Specification
Trials
Acoustic
Analyses:
ASAP Vendor/
Design Designer
Producability
FFRRVV PPrraaccttiicceess NOISE RResponse
Acoustic Performance
Specification Criteria
No Criteria
Met Drawing
Control Plan PrPocaeraslslel Review Yes
No Acoustic
Yes No
FFRRVV Limits Met
Select
Specified
Acoustic Training/Treatment Treatment Yes Revise Yes
Installation
Treatments
Procedures No
Diagnostic
Yes No
Testing
Optimal
Equipment
SSyysstteemm Treatment
PPuurrcchhaassee
Approach Implementation
Specification/
Budget/FAT Corrective
Action
Yes Treatment
Performance
Treatment Evaluation/
Design/ Equip. Test
IIntegratiion
Performance Process Data
Criteria
Acoustic
No Analysis:
Predefined
ASAP No Decision
process
Remedial
Action KEY
Criteria
Met
April 2010
VEHICLE RADIATED NOISE FLOW CHART
A/B
MMAACCHHIINNEERRYY PPRROOPPEELLLLEERR FFLLOOWW
S/B
SEA CONNECTED HULL
ENCLOSURE ISOLATOR COATING
AIR
INJECTION
FFOOUUNNDDAATTIIOONN
APPENDAGES
NOISE HULL
TREATMENT COATING
DECK, BULKHEAD
VIBRATION
NOISE
TREATMENT
HHUULLLL//
SHELL
NOISE
TREATMENT
NOISE
TREATMENT
AIRBORNE NOISE U/W RADIATED
SONAR SELF NOISE
NOISE
11//3311//22000088 NNoiise CControll EEngiineeriing, IInc.
April 2010
SSHHIIPP’SS UUWW SSIIGGNNAATTUURREE
controls siggnature when cavitatingg
• Proppeller –
– Cavitation – ICES – Cavitation free to 12 kts
– AZIPOD – unacceptable for low noise vessel
– BBooww TThhrruusstteerrss – nnoott ooppeerraattiioonnaall ffoorr FFRRVV qquuiieett mmooddee
• Machinery Noise
– Propulsion Diesels or Motors
– DDiieesseell GGeenneerraattoorrss
– Large Reciprocating Machinery, Air Compressors
• Sea Connected Systems
– Main Seawater Cooling
– Auxiliary Seawater Cooling
April 2010
PPrrooppeelllleerr NNooiissee – CCaavviittaattiioonn…
… is the vaporization
UUnnsstteeaaddyy SShheeeett
off water ddue to a
decrease of the Cavitation
local pressure. This
ggeenneerraatteess mmiilllliioonnss
of very small vapor
bubbles whose
collapse generates
siigniiffiicantt
underwater noise.
Vortex
April 2010
PPaatthhss ffoorr MMaacchhiinneerryy NNooiissee
• Airborne
•• FFiirrsstt
Structureborne
• Secondary
Structureborne
•• UU//WW RRaaddiiaatteedd
Noise
April 2010
OSCAR DYSON; Vessel Particulars.
LLeennggtthh 6644 mmeetteerrss
Beam 15 meters
6 meters (centerboard retracted), 9.2 meters
DDrraafftt
(centerboard extended)
Displacement 2479 metric tons
SSppeeeedd 1144 kknnoottss ((ssuussttaaiinneedd)), 1111 kknnoottss ((mmaaxxiimmuumm qquuiieett ssppeeeedd))
Two Caterpillar 3508 (910 kW, 1800 rpm) &
Diesel
Two Caterpillar 3516 (1360 kW, 1800 rpm)
Generators
Propulsion
Two tandem 1950 kW @ 128 rpm
Motor
Propeller Five blade, skewed
April 2010