Problem statement on the vessel braking within ice channel

Goncharov, Vadim K.; Klementieva, Natalia Yu

doi:10.1093/tse/tdaa032

Cited by 3 publications

(1 citation statement)

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“…when the leading vessel comes to a halt due to a heavy ridge, the following ship needs to take immediate action to avoid collision. Such actions can be braking the vessel by reversing the propulsor thrust or evasively breaking out of the channel with rudder or pod action [3]. Accidents may happen if the following ship cannot stop or leave the channel before reaching the front ship [4].…”

Section: Introductionmentioning

confidence: 99%

Safety Distance During Escort and Convoy Based on Channel Breakout Simulation and Model Tests

Puolakka

Goerlandt

et al. 2022

Volume 6: Polar and Arctic Sciences and Technology

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Escort and convoy are typical operations when a merchant ship navigates in ice beyond its own ice-going capability. In such scenarios, a safety distance between the front ship and the following ship is maintained. The leading vessel may suddenly decelerate or even come to a halt if it encounters a heavy ridge or thick ice floe. When this happens, the following ship needs to take actions to avoid collision with the leading vessel. An evasive operation for such collision avoidance is to break out of the channel. The safety distance can be defined as the minimum distance which is needed for successful collision avoidance. This depends on various parameters such as ice thickness, ship speed, channel width, the ship’s icebreaking capability and its manoeuvrability in ice. This paper investigates safety distance during escort and convoy by model-scale experiments and numerical simulation of a ship breaking out of ice channel. The experiments are carried out at Aalto Ice Tank and the numerical simulations are conducted via the in-house simulation software package of Aalto University Marine Technology group. The dependencies of the safety distance on ice thickness, channel width and initial speed are identified via multiple experimental and simulation runs. The simulation proves to provide accurate estimation on breakout distance through comparison with model test results, and reveals the influence of ice thickness, channel width and initial speed on the breakout distance.

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Section: Introductionmentioning

confidence: 99%