Tugboat underwater radiated noise measurements / prepared by Robert Allan Ltd. : T29-194/2026E-PDF

"Robert Allan Ltd. (RAL) was retained by the Innovation Centre of Transport Canada (TC‑IC) to conduct a study to compare the underwater radiated noise (URN) from a modern battery‑electric (BE) harbour tug with that from diesel‑mechanical (DM) harbour tug with approximately equivalent size and performance. The two tugs used for the study are normally engaged in ship assist operations in the Port of Vancouver. The objective of the study was to characterize and compare URN emissions across representative operating conditions, identify dominant URN sources and transmission mechanisms, and evaluate the potential URN benefits of battery‑electric propulsion in environmentally sensitive waters"--Executive Summary, page vii.

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