Supporting standards to characterise vessels’ URN. Objective evaluation based on the SATURN project measurements
Supporting standards to characterise vessels’ URN. Objective evaluation based on the SATURN project measurements
"Supporting standards to characterise vessels’ URN. Objective evaluation based on the SATURN project measurements", organizado por CITMAga. Será impartido por Roberto Yubero de Diego [TSI Madrid (Spain)]
Data: venres 19 de xullo
Hora: 11:30 h.
Duración: 45 min
Lugar: En liña (MS Teams)
Abstract:
During November 2022, TSI executed a nine-day test campaign to measure vessel underwater radiated noise (URN) following various testing procedures. The methods included international standards and classification societies’ notations, used to characterise vessel underwater sound in deep and shallow water. A comparison of reported vessel signatures from the different methods returned different URN levels for equal operating conditions, proving the need for unifying methodologies.
Most of the methods returned lower levels than those obtained under the standard ISO 17208-1, with differences ranging from -1.5 dB to -12 dB for the same vessel. In the context of that test campaign, it was also possible to test the first international standard to measure vessel URN in shallow water, the draft international standard (DIS) of ISO 17208-3 (currently under development). ISO/DIS 17208-3 was identified as a consistent procedure to characterise underwater vessel sound, comparing their results against the consolidated international standard for measuring source level in deep water, the ISO 17208-2. The analytical formulation of propagation loss (PL) proposed by ISO/DIS 17208-3, used to obtain vessel URN in such a complex environment, demonstrated a good trade-off between ease of use and precision.