Full-scale ice impact to an azimuthing thruster in laboratory conditions

Ilkka Perälä, Aki Kinnunen, Pekka Koskinen, Jaakko Heinonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

Ships navigating in winter conditions frequently come in contact with ice blocks floating on the waterways. The ice blocks can collide with the propulsion machinery of the ship. Especially the interaction between ice and ship azimuthing propulsion call for greater understanding. Ice blocks can collide with the azimuthing propulsion units in many different ways, one of them being the propulsion unit hitting the ice block as the ship advances. This is an impact type loading case and the dynamics of the thruster and ship hull affect to the load response level obtained in this case. In a dynamic system, the damping is greatly affecting to the response level. To study the dynamics and damping in an ice impact event, a full-scale test opportunity was found in an azimuthing thruster test bench. An impact test with a full-scale thruster and ice blocks was carried out in the laboratory with velocities corresponding to realistic ship operating speeds. In addition, numerical analyses of the ice-structure interaction were carried out and structural response was compared with the impact test measurements. Comparison between the simulations and the tests gave valuable information about the thruster dynamics during the ice impact.
Original languageEnglish
Title of host publicationProceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions
Number of pages12
Publication statusPublished - 1 Jan 2017
MoE publication typeA4 Article in a conference publication
Event24th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC 2017 - Busan, Korea, Republic of
Duration: 11 Jun 201716 Jun 2017
Conference number: 24

Publication series

NamePOAC Proceedings
ISSN (Print)0376-6756

Conference

Conference24th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC 2017
Abbreviated titlePOAC 2017
CountryKorea, Republic of
CityBusan
Period11/06/1716/06/17

Fingerprint

Ice
Ships
Propulsion
Damping
Ship propulsion
Machinery
Dynamical systems

Keywords

  • ice
  • ice impact
  • azimuthing propulsion
  • dimulation
  • full-Scale measurement
  • Full-scale measurement

Cite this

Perälä, I., Kinnunen, A., Koskinen, P., & Heinonen, J. (2017). Full-scale ice impact to an azimuthing thruster in laboratory conditions. In Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions POAC Proceedings
Perälä, Ilkka ; Kinnunen, Aki ; Koskinen, Pekka ; Heinonen, Jaakko. / Full-scale ice impact to an azimuthing thruster in laboratory conditions. Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions. 2017. (POAC Proceedings).
@inproceedings{d9a2e3e87ae343e4b3698bc46f627988,
title = "Full-scale ice impact to an azimuthing thruster in laboratory conditions",
abstract = "Ships navigating in winter conditions frequently come in contact with ice blocks floating on the waterways. The ice blocks can collide with the propulsion machinery of the ship. Especially the interaction between ice and ship azimuthing propulsion call for greater understanding. Ice blocks can collide with the azimuthing propulsion units in many different ways, one of them being the propulsion unit hitting the ice block as the ship advances. This is an impact type loading case and the dynamics of the thruster and ship hull affect to the load response level obtained in this case. In a dynamic system, the damping is greatly affecting to the response level. To study the dynamics and damping in an ice impact event, a full-scale test opportunity was found in an azimuthing thruster test bench. An impact test with a full-scale thruster and ice blocks was carried out in the laboratory with velocities corresponding to realistic ship operating speeds. In addition, numerical analyses of the ice-structure interaction were carried out and structural response was compared with the impact test measurements. Comparison between the simulations and the tests gave valuable information about the thruster dynamics during the ice impact.",
keywords = "ice, ice impact, azimuthing propulsion, dimulation, full-Scale measurement, Full-scale measurement",
author = "Ilkka Per{\"a}l{\"a} and Aki Kinnunen and Pekka Koskinen and Jaakko Heinonen",
note = "Project code: 102520",
year = "2017",
month = "1",
day = "1",
language = "English",
series = "POAC Proceedings",
booktitle = "Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions",

}

Perälä, I, Kinnunen, A, Koskinen, P & Heinonen, J 2017, Full-scale ice impact to an azimuthing thruster in laboratory conditions. in Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions. POAC Proceedings, 24th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC 2017, Busan, Korea, Republic of, 11/06/17.

Full-scale ice impact to an azimuthing thruster in laboratory conditions. / Perälä, Ilkka; Kinnunen, Aki; Koskinen, Pekka; Heinonen, Jaakko.

Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions. 2017. (POAC Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Full-scale ice impact to an azimuthing thruster in laboratory conditions

AU - Perälä, Ilkka

AU - Kinnunen, Aki

AU - Koskinen, Pekka

AU - Heinonen, Jaakko

N1 - Project code: 102520

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Ships navigating in winter conditions frequently come in contact with ice blocks floating on the waterways. The ice blocks can collide with the propulsion machinery of the ship. Especially the interaction between ice and ship azimuthing propulsion call for greater understanding. Ice blocks can collide with the azimuthing propulsion units in many different ways, one of them being the propulsion unit hitting the ice block as the ship advances. This is an impact type loading case and the dynamics of the thruster and ship hull affect to the load response level obtained in this case. In a dynamic system, the damping is greatly affecting to the response level. To study the dynamics and damping in an ice impact event, a full-scale test opportunity was found in an azimuthing thruster test bench. An impact test with a full-scale thruster and ice blocks was carried out in the laboratory with velocities corresponding to realistic ship operating speeds. In addition, numerical analyses of the ice-structure interaction were carried out and structural response was compared with the impact test measurements. Comparison between the simulations and the tests gave valuable information about the thruster dynamics during the ice impact.

AB - Ships navigating in winter conditions frequently come in contact with ice blocks floating on the waterways. The ice blocks can collide with the propulsion machinery of the ship. Especially the interaction between ice and ship azimuthing propulsion call for greater understanding. Ice blocks can collide with the azimuthing propulsion units in many different ways, one of them being the propulsion unit hitting the ice block as the ship advances. This is an impact type loading case and the dynamics of the thruster and ship hull affect to the load response level obtained in this case. In a dynamic system, the damping is greatly affecting to the response level. To study the dynamics and damping in an ice impact event, a full-scale test opportunity was found in an azimuthing thruster test bench. An impact test with a full-scale thruster and ice blocks was carried out in the laboratory with velocities corresponding to realistic ship operating speeds. In addition, numerical analyses of the ice-structure interaction were carried out and structural response was compared with the impact test measurements. Comparison between the simulations and the tests gave valuable information about the thruster dynamics during the ice impact.

KW - ice

KW - ice impact

KW - azimuthing propulsion

KW - dimulation

KW - full-Scale measurement

KW - Full-scale measurement

UR - http://www.scopus.com/inward/record.url?scp=85040904372&partnerID=8YFLogxK

M3 - Conference article in proceedings

T3 - POAC Proceedings

BT - Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions

ER -

Perälä I, Kinnunen A, Koskinen P, Heinonen J. Full-scale ice impact to an azimuthing thruster in laboratory conditions. In Proceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions. 2017. (POAC Proceedings).