Working togetherfor a safer world

Eliminating noise and vibration problems requires careful engineering and proper attention. Since 1980 we have served yards, designers and owners; today we have clients in more than 30 countries. We have developed state-of-the-art computational tools, test methods and measurement techniques taking noise and vibration control engineering to new heights.

Areas of expertise − noise prediction − vibration analysis − propeller and machinery noise and

vibration control − sea trial assistance, measurement

surveys, investigative measurements and troubleshooting

− room-to-room sound insulation − inspections and assistance in

negotiations − drafting of specifications.

Detailed specifications may prevent many problems during the later stages of a shipbuilding project. We can assist in the preparation of specifications and advise the industry on required precautions in order to comply with contract specifications.

Noise analysisUsing our SHIPNOISE software, noise levels are predicted in all relevant spaces. Based on this prediction, it is possible to select the most appropriate measures for

the comfort and privacy of the passengers and the crew members:

− sound insulation − viscoelastic damping layers − floating floors − silencers − resilient mountings.

Vibration analysisFor vibration analyses, we apply the finite element method. The purpose of this is to avoid resonances and associated vibration problems. Local structures,

Passenger ship - noise and vibrationConsulting

substructures and global hulls may be analysed. Vibration reducing stiffening may be simulated in order to verify the improvement and to identify the minimum necessary measures.

PropellersExcessive propeller induced vibration is a frequent cause for reliability and comfort problems, and may put limitations on the speed of ‘problem’ vessels. We have extensive experience in propeller analysisat the design stage. Through specialist troubleshooting, we have successfully cured a very wide variety of propeller induced noise and vibration problems.

Measurements and troubleshootingMeasurements are necessary to verify noise and vibration levels during sea trials, but also to solve problems. Troubleshooting requires advanced equipment and experienced measurement engineers. In some cases, a single consultant can do the measurements with portable instruments and provide advice on the spot. For more complex cases, extended surveys and analyses are required.

Comfort problems, structure, machineryand equipmentWe investigate comfort problems, cracks, damages and reported high noise or vibration levels, e.g.:

− cabin sound insulation − noise from activities on board − noise in crew and passenger areas

− hull vibration − engine or shaft vibration − gearbox vibration − ventilation noise.

We base our assessment of the measurement results on more than three decades of experience, supported by calculations of structure, shafting etc.

ReferencesSelected clients – yards:

− Aker Finnyards, Finland − Daewoo, Korea − Dalian, China − Fincantieri, Italy − Guangzhou, China − HDW, Germany − Hyundai, Korea − Izar, Spain − Van der Giessen, Holland.

Selected clients / owners: − Celebrity Cruises, USA − Color Line, Norway − Disney Cruise Line, USA − DFDS, Denmark − Festival Shipping, Greece − P&O Princess, UK − ResidenSea, Norway − Royal Caribbean, USA − Royal Olympic, Greece − Scandlines, Denmark − Star Cruises, USA − Silja Line, Finland − Stena, Sweden − Strintzis, Greece − V-ships, Monaco.

www.lr.orgDecember 2013Lloyd’s Register and variants of it are trading names of Lloyd’s Register Group Limited, its subsidiaries and affiliates. Copyright © Lloyd’s Register Group Services Limited. 2013. A member of the Lloyd’s Register group.

To find out more about how we can help you please visit us at: www.lr.org/consulting or contact us at info.consulting@lr.org

Why Lloyd’s Register Consulting

− World-leading discipline expertise and personnel

− Global presence and fast response time

− More than 30 years of experience − Resources and personnel to

manage your asset through design, commissioning, and operation

− Commercial independence from vendors and contractors

− State-of-the-art numerical and analytical tools

− Purpose built methods − Worldwide technical network of

universities and other knowledge providers.

We reinvest a substantial portion of our turnover in research and development to ensure that our customers receive the best value for their investment in our services.