Stage 3 Noise and vibration analysis NOISE
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1 Stage 3 Noise and vibration analysis NOISE
2 Noise and vibration Frequency range Transformer Hum Telephone Bandwidth TV-hum [Hz] Vibration Vibration Noise
3 Major noise sources in vessels - Propulsion propeller - Diesel engines and exhaust system - Bow thrusters
4 Semi submersible drilling rig
5 Measured Propeller Noise Source Strength 170 From transient cavitation Pressure in db re µpa/hz^0.5/m From tip vortices f (Hz) Measured Measured A-weighted
6 Vibration/Noise in aft ship, Cruise Vessels Peak value: 1.3 mm/s RMS Overall level: 3.5 mm/s RMS
7 Propeller Modification DNV GL proposed and predicted effect of propeller modification
8 Tunnel thrusters Often located very close to accommodation Prolonged use in vessels with DP
9 Offshore Service Vessels / Bow-thruster noise
10 Resiliently Mounted Tunnel Thrusters Double tunnel type
11 Resiliently Mounted Tunnel Thrusters Brunvoll Rolls Royce
12 Noise level from thruster with increasing diameter for same power setting 12
13 Main Engines Often located close to accommodation Always on Difficult to attenuate firing frequency 13
14 Situation onboard an OSV if without noise consideration Rigidly mounted main engine Simple floating floor construction Conventional tunnel thrusters Do not comply with the noise criteria in transit condition Even larger discrepancies in manoeuvring/dp condition 14
15 Noise reducing measures resiliently mounted main engines - Inclined isolator arrangement - Dynamic advantages - Stable arrangement
16 Dynamic behaviour of seating configurations BAD!! BETTER! GOOD!
17 Resilient mounting of piping
18 Resilient mounting of piping GOOD! WRONG!
19 Floating Accommodation Resilient suspension Mineral wool Steel bulkhead Ceiling panel Accommodation panel Top floor Mineral wool Steel deck
20 Noise reducing measures resiliently mounted main engines 70 Cabins on Main Deck Noise levels in db(a) Noise Level, db(a) re. 2 x 10-5 Pa k 2k 4k 8k Frequency (Hz) Ship 1 - Firmly mounted main engine Ship 2 - Resiliently mounted main engine
21 Sound transmission paths
22 Structureborne Noise Transmission
23 Noise control against NORSOK noise requirement
24 Noise reducing enclosure
25 Noise reducing curtains
26 Noise reducing curtains for diesel generators
27 Enclosure of Mud Pumps
28 Noise Screening of draw works
29 Exhaust Often located very close to accommodation Always on Difficult to attenuate firing frequency
30 Noise Exhaust system
31 Noise - Exhaust Gas System
32 Elastic mounting of exhaust system
33 Noise Exhaust system
34 Distance and Insulation Distance and Insulation
35 External noise Requirements in ports coming more often.
36 External noise Can be done in design stage and for ships in operation
37 Other sources Often located on suboptimal foundation Often located close to accommodation
38 Noise - Sound Insulation of Air Intake
39 Noise Attenuated Hydraulic Installation Hydraulic pipes, pumps, ventilation channels etc. that are rigidly mounted efficiently transmits noise into the structure Pipes should be elastically clamped All clamps and supports should be placed at a stiff location (girder etc.) Pumps/motors should preferably be resiliently mounted
40 Hydraulic noise reduction S Silencer /Pulsation dampers Elastic clamps of piping
41 Typical hydraulic installations
42 Elastic mounting of pump and piping
43 Noise reducing measures summary Resiliently mounted main engines~ 7-9 db(a) Optimized floating floor ~ 8-10 db(a) Double tunnel construction ~ 8-10 d(a) Dynamic Positioning Condition Average Noise level, db(a) Main Shelter Forecastle Deck Conventinal Built to Comfort Class
44 Floating Accommodation Resilient suspension Mineral wool Steel bulkhead Ceiling panel Accommodation panel Top floor Mineral wool Steel deck
45 Noise Floating floors f o = 1 k 1 = 2π m 2π E mh k Stiffness of mineral wool m Mass h Thickness of mineral wool m k
46 Noise Floating floors db Damping f o = 1 k 1 = 2π m 2π E mh Soft floating floor Stiff floating floor f O2 fo 1 Reduction in db Hz
47 Noise Acoustic optimized floating floor Accommodation panel - Deck coating -Steel plates, 3-5 mm 25 mm - Glass/Mineral wool, mm density 140 kg/m 3 - Constraining layer, Latex-cement, mm (~1500 kg/m3) -Visco-elastic damping layer thickness 1-2 mm -Steel deck
48 Constrained visco-elastic damping layer
49 Viscoelastic Damping Treatment Visco-elastic damping layer, 1-2 mm Steel Tiles, mm Steel Deck Visco-elastic damping layer construction
50 DP3 Offshore construction vessel with COMF-V(1)
51 Necessary improvement after delivery Initial Crit. Initial noise levels
52 Firm connections to steel structure
53 Noise levels before and after assistance After Before Crit.
54 Firm contact between floating floor and steel structure
55 Structural contact to accommodation walls
56 Noise - Resilient mounting of ceiling Deckhead Rubber Ceiling Ceiling
57 Elastic mounting of ceiling Good elastic suspension, or freestanding ceiling will reduce impact sound level by 5 db or more. Slide 57
58 Helicopter noise
59 NORSOK - Helicopter noise criteria 55 db(a) in cabin
60 Public Address and General Alarm analysis(paga) Calculate public address loudness
61 PAGA analysis Find optimal number of speakers May be possible to reduce number of speakers
62 Stage 4 Noise and vibration measurement NOISE
63 Measurement in the Restaurant Sequence Running Engines Average Gen. Load 1 DG5and6 80% 2 DG1and6 78% 3 DG4and6 78% 4 DG1and4 78% 5 DG1and5 79% 6 DG1and2 76%
64 Main Recommendations Consider rearranging the anchorage point with confirmation from manufacturer Consider changing the vertical resilient mounts of the exhaust boilers which seem to be aged and worn out Consider strengthening hull structure by inserting two pillars
65 Measurement Result in the lounge Pink noise and music
66 Recommendation in the order of cost vs. effect 1. Educate personnel and making them aware of the overall reduction of noise levels produced in the lounge will be reflected in the cabins above. 2. Reduce low frequency components of live music 3. Redesign speaker cabinets 4. Change resilient mounts for main speakers to softer ones Remove
67 DNV GL SILENT-E Notation and Underwater Noise Measurement
68 Criteria for SILENT-E Two operation conditions are required: transit condition and quiet cruise condition Two runs need to be measured for each condition
69 Measured operating conditions Measurement sites were chosen based on ship itinerary and site geometry. Two sets of hydrophone were deployed at two sites to have the measurement performed in one day
70 Measurement Procedure Running the measurement for quiet cruise condition Preparing the hydrophone and cable Got on-site DNV GL
71 Environmental Risk Induced by Underwater Noise Determined the expected environmental impact and compared this to the existing noise emissions in the area
72 Noise & Vibration Noise and vibration on ships and offshore structures can impair crew performance, cause passenger dissatisfaction, and lead to failure of structures, machinery and equipment. Our Advisory Services offer an extensive portfolio of noise and vibration related services, ensuring enhanced comfort for crew and passengers on board, and that your vessels comply with all international regulations. Services Global Vibration Analysis Local Structural Vibration Analysis Vibration Analysis of Machinery & Equipment Noise Analysis Propeller excitation analysis Hydroacoustic Noise Analysis (underwater) Structural Vibration Measurements Noise Measurements Hydroacoustic Measurements Shock Analysis of Machinery & Equipment Class Notations: Comfort Class Silent Class Vibration Class Value proposition Enhance the environment conditions related to noise and vibration for crew and passengers and minimise risk of human fatigue Minimise your risk of exceeding contractual vibration and noise limits Avoid fatigue damage to structure and machinery Reduce downtime and repair costs
73 Thank you! Yanran Wang Mobile Direct SAFER, SMARTER, GREENER
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