ISO 17208-1:2016/Amd 1:2024

Overview

ISO 17208-1:2016/Amd 1:2024 is an important amendment to the international standard focusing on underwater acoustics. This amendment updates Part 1: Requirements for precision measurements in deep water used for comparison purposes relating to the description and measurement of underwater sound emitted from ships. Published by ISO, this document ensures standardized procedures and quantities for precise and consistent deep-water measurements of ship noise. The amendments refine definitions, measurement practices, and normative references, reflecting advancements and enhanced clarity in the field of underwater sound measurement.

Key Topics

• Precision measurement requirements for underwater sound in deep water locations, critical for the comparison of acoustic emissions across different ships.
• Updated definition of radiated noise level, specifying the root-mean-square sound pressure measured at a distance from the ship, ensuring consistency in terminology and calculation.
• Specification of frequency-domain averaging in measurements, with an emphasis on linear power averaging and proper sampling aligned with the data window period.
• Inclusion of detailed broadband processing requirements, utilizing one-third octave (decidecade) bands from 10 Hz to 20 000 Hz with Class 1 accuracy, following ISO 18405.
• Clarification of deep water criteria linked to minimum test site requirements, necessary for valid precision measurements.
• Updated normative references for related standards, including changes from IEC 61260 to IEC 61260-1.
• Amendments in measurement procedures and terminology, such as the replacement of “Williamson turn” labeling for maneuvering in ship noise tests.
• Insertion of references to Part 2 of ISO 17208, outlining procedures for determination of source levels from deep water measurements, complementing Part 1.

Applications

ISO 17208-1:2016/Amd 1:2024 is highly relevant to:

• Marine engineers and acousticians conducting underwater noise impact assessments for ships.
• Environmental agencies monitoring and regulating underwater noise pollution to protect marine ecosystems.
• Shipbuilders and naval architects seeking to design quieter vessels conforming to international noise emission standards.
• Research institutions performing studies on underwater acoustics and noise propagation in marine environments.
• Port authorities and maritime operators implementing noise reduction strategies and ensuring compliance with sound emission limits.
• Development and calibration of underwater acoustic measurement equipment used in open ocean or deep water test sites.

Related Standards

• ISO 17208-2: Complementary to Part 1, this standard focuses on the determination of source levels from deep water measurements and is referenced in the amendment for broader procedural context.
• ISO 18405: Provides detailed methodologies related to underwater sound measurement, referenced for acoustic terminology and techniques.
• IEC 61260-1: Defines frequency analysis performance specifications, which underpin the frequency-domain processing requirements in ISO 17208-1.
• Additional acoustic standards under ISO/TC 43, Acoustics, governing measurement practices and terminology in the field of underwater acoustics.

By adhering to ISO 17208-1:2016/Amd 1:2024, organizations enhance the accuracy and comparability of underwater ship noise data, promoting sustainable maritime operations and informed environmental stewardship. This amendment is vital for maintaining consistency in underwater acoustics measurement amid evolving technologies and environmental policies.