Test & measurement
construction, especially in the fleet of oceanographic vessels. This type of high-tech ship is a market niche, with Spanish shipbuilders leading the way, meeting the strictest requirements and specifications, such as ICES N°209 on underwater noise of research vessels. This, in turn, has led to TSI taking a leading role in the construction of ‘silent vessels’, becoming specialist consultants on noise and vibration for shipbuilders up to the point of assisting them to become world- class technological benchmarks. The acoustic impact of the vessels is considered
one of the factors that contributes to the state of the environment. It is increasingly important for the ship industry and regulatory bodies to have measurement procedures that allow underwater noise radiated by vessels to be calculated correctly. And it is here where HBK products play a very important role. Some international standardisation bodies, such as ANSI and ISO, have developed, and keep refining procedures for civil applications to quantify the emission of underwater noise of vessels. In TSI’s technical department, HBK’s role is perfectly clear. In their own words: “TSI has been using Brüel & Kjær sound level meters since the start of our operations in 1983. They contribute great value and reliability of results in the performance of our daily work. Currently, TSI’s technical department has three sound level meters (Types 2270 and 2260), an OmniPower Sound Source Type 4292, Power Amplifier Type 2734, Sound Intensity Probe Type 3599 and three Type 8104 hydrophones, to
tackle the different measurement and test campaigns that are habitually carried out in the development of newly built ship and operational projects. The use of HBK technology at TSI is paramount for our operations, and also for carrying out routine measurements, validation measurements and as phenomena research tools.” However, there are aspects of these
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procedures that are still not consolidated from a technical point of view, such as the measurement uncertainty associated with the procedures. Also, some topics have still not been addressed, such as measurements in shallow waters. As a result of its knowledge and expertise, and supported by state-of-the-art
HBK technology, TSI can provide realistic values for the uncertainty and repeatability of the measurement procedure. Due to its impact on marine life, the reduction of underwater radiated noise by vessels has become the most prominent new issue and one of the toughest challenges for the shipbuilding industry – together with the decarbonisation of the propulsion. For this, the industry is attempting to provide new solutions that meet the new directives and requirements that have been recently developed and promoted by the EU, marine institutions and the scientific community.
HBK
www.hbkworld.com
Instrumentation Monthly March 2022
53
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