A study on ice induced vibration of a ship structure based on full scale measurement

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (20) : 319-326.

HE Shuaikang1, CHEN Xiaodong1, CUI Hongyu1,2, JI Shunying1

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Abstract

For vessels navigating in ice infected waters, structure responses strong vibration due to ice loads. It is of great significance to study the characteristics of ice-induced vibration for ice-class ship design and navigation safety assessment in ice area. To study ice-induced vibration, a series of full-scale experiments are performed on the icebreaker Xuelong during the 8th Arctic Scientific Expedition of China. Considering the ice-structure interaction frequently appears at the bow area, the vibration is measured through a triaxial accelerometer installed in peak cabin. In order to study the influence of sea ice type on structural vibration, the ice condition is recorded by video cameras, the analysis is done with the data from different ice condition including open water, broken ice, level ice and ice ridges. Furthermore, the vibration of the icebreaker Xuelong is evaluated with the ISO 6954 standard and the statistic study is carried out according to the evaluation index defined in the standard. The results show that the ice-induced vibration was between the harmful vibration and the harmless vibration levels, while the vibration is strongest along the ship width direction and weakest along the length direction. In overall the vibration amplitude flows a generalized extreme value distribution. In addition, the different ice type results in different additional mass and consequently influences the first-order vibration frequency. The vibration amplitude has positive correlation with ship speed and ice thickness.

Key words

navigation in the Arctic / ice-induced vibration / full-scale measurement / ship structure

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HE Shuaikang1, CHEN Xiaodong1, CUI Hongyu1,2, JI Shunying1. A study on ice induced vibration of a ship structure based on full scale measurement[J]. Journal of Vibration and Shock, 2023, 42(20): 319-326

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