Marine noise and vibrationNoise and Vibration can ruin an otherwise perfect design of vessel. At worst, such vessels may fail the legal noise requirements of the Recreational Craft Directive, or their machinery may fail through excessive vibration. More commonly, the customer may be disappointed with the poor levels of refinement of their "dream ship".
Through good design and a full understanding of the structure, acoustics and machinery of a vessel, practical control measures can nearly always be found.
Although ISVR Consulting is fully capable of carrying out projects on large commercial ships, we have primarily concentrated our activities in the recreational and small commercial sectors, with vessels up to 50 metres in length. Activities cover the full range of marine requirements including new build, refit and problem solving.
Support can be given throughout the new build programme. At the early design stage, advice can be given on layout, structural design detail and the choice of machinery. As the design develops, the choice of materials and trim levels can be optimised to minimise noise without impinging detrimentally upon other design criteria such as styling, weight and cost.
Throughout the build, the vibro-acoustics of the vessel can be monitored to ensure target levels for noise and vibration are being met. During sea trials, a full measurement service can be provided and, in the event that any concerns are raised, rapid solutions can be implemented.
Prior to refit, a full or partial noise and vibration survey can be carried out and reduction targets discussed and agreed. Ways to meet these targets can be proposed and, as with a new build, their implementation can be monitored or directed as required.
Perhaps the ISVR's greatest strengths are with problem solving. Being local to the South Coast, many yacht owners, skippers or builders are within a short journey time and so if need be, measurements can be made and control strategies discussed within hours of a phone call.
Most problems arise from changes to the machinery, whether intentionally at refit, or unintentionally as in the case of component wear or failure. Powerful measurement and analysis techniques can rapidly identify the cause of the problem and, with a clear understanding of the problem, solutions usually become obvious.
The Marine activities of ISVR Consulting are supported by extensive experience of engine, transmission and powertrain noise and vibration in the Automotive industry. We also have links with the Wolfson Unit for Marine Technology and Industrial Aerodynamics (WUMTIA), another specialist group within the University of Southampton.