Evaluation, design and optimization for strength and integrity of polar class propellers

  1. Get@NRC: Evaluation, design and optimization for strength and integrity of polar class propellers (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.coldregions.2015.02.001
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Journal titleCold Regions Science and Technology
Pages3139; # of pages: 9
SubjectBending moments; Ice; Offshore structures; Pipeline bends; Propellers; Safety factor; Design and optimization; Ice-structure interaction; In-plane bending moment; International association of classification societies; Minimum safety factor; Out-of-plane bending; Polar class; R-class; Loading; bending; design; fluid-structure interaction; ice breaker; ice-structure interaction; navigation; optimization; panel data
AbstractAn advanced 3D unsteady panel method was developed for the design and optimization of the strength and integrity of polar class propellers. Blade ice loading specification in both milling and impact cases, under the Unified Polar Class Rules (URI3), by the International Association of Classification Societies (IACS), was implemented. An optimization example and analysis were given for an R-class propeller. The strength of the R-class propeller was assessed for all 7 polar classes and 5 loading cases. Comparison was also made for all polar classes and ice loading cases. As the blade has little skew with a wide chord, both the spindle torque and the in-plane bending moment are small, so only out-of-plane bending failure is the key factor for strength. It was also found that by URI3, there is little difference in strength requirement between polar classes 1 (strongest requirement) and 7 (the weakest). An integrity design and optimization example showed a saving of 1.4. tonnes of blade material (22% saving) by decreasing the safety factor to 1.51 (the minimum safety factor under URI3 is 1.5), for which case the blade thickness is about 80% of the existing design.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Ocean, Coastal and River Engineering
Peer reviewedYes
NRC numberOCRE-PR-2015-003
NPARC number21275788
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Record identifier3fe4e28f-cd1e-4bd2-9fd2-e8479f825454
Record created2015-07-14
Record modified2016-05-09
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