Abstract
For ships operating in winter conditions, ice loads are important load scenarios for designing azimuthing main propulsion units. One such contact scenario is ice impacting into an azimuthing thruster. In this paper, the formulation of this type of load scenario is presented and existing calculation methods are investigated. A calculation method for dynamic contact load is proposed for ice impact against the main propulsion unit. The basic principle of the proposed load calculation method is an impact of moving bodies combined with dynamic reaction of the structure. The contact load determination is based on the contact pressure–area relationship between an ice block and a steel structure. The dynamic contact problem is solved with a forward difference method. The method is validated with a controlled laboratory-scale test and the test principle is introduced. The dynamic load model is applied to study the effect of dynamics on the response load level.
| Original language | English |
|---|---|
| Pages (from-to) | 890-898 |
| Number of pages | 9 |
| Journal | Ships and Offshore Structures |
| Volume | 14 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 17 Nov 2019 |
| MoE publication type | Not Eligible |
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Keywords
- azimuthing thruster
- ice impact
- ice load model
- Ice–structure interaction
- load scenario
Cite this
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Dynamic ice contact load model for azimuthing thrusters. / Kinnunen, Aki (Corresponding Author); Tikanmäki, Maria; Heinonen, Jaakko; Koskinen, Pekka.
In: Ships and Offshore Structures, Vol. 14, No. 8, 17.11.2019, p. 890-898.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Dynamic ice contact load model for azimuthing thrusters
AU - Kinnunen, Aki
AU - Tikanmäki, Maria
AU - Heinonen, Jaakko
AU - Koskinen, Pekka
PY - 2019/11/17
Y1 - 2019/11/17
N2 - For ships operating in winter conditions, ice loads are important load scenarios for designing azimuthing main propulsion units. One such contact scenario is ice impacting into an azimuthing thruster. In this paper, the formulation of this type of load scenario is presented and existing calculation methods are investigated. A calculation method for dynamic contact load is proposed for ice impact against the main propulsion unit. The basic principle of the proposed load calculation method is an impact of moving bodies combined with dynamic reaction of the structure. The contact load determination is based on the contact pressure–area relationship between an ice block and a steel structure. The dynamic contact problem is solved with a forward difference method. The method is validated with a controlled laboratory-scale test and the test principle is introduced. The dynamic load model is applied to study the effect of dynamics on the response load level.
AB - For ships operating in winter conditions, ice loads are important load scenarios for designing azimuthing main propulsion units. One such contact scenario is ice impacting into an azimuthing thruster. In this paper, the formulation of this type of load scenario is presented and existing calculation methods are investigated. A calculation method for dynamic contact load is proposed for ice impact against the main propulsion unit. The basic principle of the proposed load calculation method is an impact of moving bodies combined with dynamic reaction of the structure. The contact load determination is based on the contact pressure–area relationship between an ice block and a steel structure. The dynamic contact problem is solved with a forward difference method. The method is validated with a controlled laboratory-scale test and the test principle is introduced. The dynamic load model is applied to study the effect of dynamics on the response load level.
KW - azimuthing thruster
KW - ice impact
KW - ice load model
KW - Ice–structure interaction
KW - load scenario
UR - http://www.scopus.com/inward/record.url?scp=85061426916&partnerID=8YFLogxK
U2 - 10.1080/17445302.2019.1578098
DO - 10.1080/17445302.2019.1578098
M3 - Article
AN - SCOPUS:85061426916
VL - 14
SP - 890
EP - 898
JO - Ships and Offshore Structures
JF - Ships and Offshore Structures
SN - 1744-5302
IS - 8
ER -