Simulating transverse icebreaking process considering both crushing and bending failures

Zhou, Li; Riska, Kaj; Ji, Chunyan

doi:10.1016/j.marstruc.2017.04.004

Cited by 28 publications

(14 citation statements)

References 4 publications

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“…When a ship moves forward against the ice, the ice breaks at the bow area and the broken ice floe becomes submerged and slides along the hull. There were almost no ice floes sliding at the bottom of the ship model, and most of the ice floes moved laterally beneath the bordering ice sheet at the low drift speed range [15]. Based on the ice resistance formula described by Lindqvist [2], the speed dependence of ice submersion resistance due to the loss of potential energy of the submerged ice floes and friction between the hull and ice floes was written as…”

Section: Static Methodsmentioning

confidence: 99%

Calculation Methods of Icebreaking Capability for a Double-Acting Polar Ship

Zhou

Diao

Song

et al. 2020

JMSE

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As a key parameter, icebreaking capability is often used to judge whether a polar ship could navigate in level ice at a certain speed. This paper presents two methods to calculate icebreaking capability. The first one is a static method based on the estimation of ice resistance under different ice thicknesses and ship speeds. The second is a dynamic method that involves solving the equation of motion. A series of model tests with a double-acting icebreaking tanker were also carried out in the ice basin of the Krylov State Research Center to measure ice resistances. The simulated ice resistances were compared with model tests results for both ahead and astern running operations. The calculated icebreaking capability based on static and dynamic methods was validated with the model test result. A good agreement was achieved between measurement and simulation. The discrepancy between the model test result and the result simulated by the static or dynamic method was minor.

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Section: Static Methodsmentioning

confidence: 99%

Calculation Methods of Icebreaking Capability for a Double-Acting Polar Ship

Zhou

Diao

Song

et al. 2020

JMSE

Self Cite

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“…Wang et al [11] have found that ice cracking arises in the interaction between ice and propeller in ice milling tests, and Khan et al [16] observed crushing happened in propeller milling ice tests when the blade edge cut the ice block. Such crushing and fracture failures are also found in the interaction between ship and level ice [17,18,19,20]. These dis-continuous problems are difficult to be solved by simply using traditional FEM method that is based on the continuous assumption.…”

Section: Numerical Modelsmentioning

confidence: 99%

Numerical Simulation of Ice Milling Loads on Propeller Blade With Cohesive Element Method

Wang

Zou

Zhou

et al. 2019

brod

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In ice-infested waters, propellers of a polar ship are likely to be exposed to ice loads in different scenarios. Propeller milling with ice is one of the most dangerous cases for icepropeller interaction. In this study, we try to simulate dynamic milling process of icepropeller and reproduce resulting physical phenomena. Cohesive element method is used to model ice in the simulation. To simulate material properties of ice, an elastoplastic softening constitutive law is developed. Both crushing and fracture failures are included in the icepropeller milling process. The ice loads in 6 Dofs acting on blades of a propeller are calculated in time domain. The average and standard deviations of simulated dominant ice loads are compared with those from model test. A good agreement is achieved. By varying propeller rotation speed, advance velocity and cutting depth on ice block, the sensitivity study has been carried out. The results show that dominant ice loads are affected much by the three parameters. It is shown that decreasing rotation speed, or increasing advance velocity and cutting depth may lead to higher ice loads. Care should be taken to avoid overloading on propeller when operating in ice for polar ship.

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“…This will result an increased ice load. Zhou et al (2017) proposed a numerical method to study crushing force for ice bending research [32]. Their method was used to simulate ice loads acting on the hull side of an icebreaking tanker as the hull model was pulled transversely.…”

Section: Mathematical Modelmentioning

confidence: 99%

A Simulation of Non-Simultaneous Ice Crushing Force for Wind Turbine Towers with Large Slopes

et al. 2019

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When the offshore wind energy industry attempts to develop in cold regions, ice load becomes the main technological challenge for offshore wind turbine foundation design. Dynamic ice loads acting on wind turbine foundations should be calculated in a reasonable way. The scope of this study is to present a numerical model that considers the non-simultaneous ice crushing failure acting on the vertical structure of a wind turbine’s foundation. The local ice crushing force at the contact surface between the ice sheet and structure is calculated. The boundary of the ice sheet is updated at each time step based on the indentation length of the ice sheet according to its structure. Ice loads are validated against two model tests with three different structure models developed by other researchers. The time series of the ice forces derived from the simulation and model tests are compared. The proposed numerical model can capture the main trends of ice–wind turbine foundation interaction. The simulation results agree well with measured data from the model tests in terms of maximum ice force, which is a key factor for wind turbine design. The proposed model will be helpful for assisting the initial design of wind turbine foundations in cold regions.

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Simulating transverse icebreaking process considering both crushing and bending failures

Cited by 28 publications

References 4 publications

Calculation Methods of Icebreaking Capability for a Double-Acting Polar Ship

Calculation Methods of Icebreaking Capability for a Double-Acting Polar Ship

Numerical Simulation of Ice Milling Loads on Propeller Blade With Cohesive Element Method

A Simulation of Non-Simultaneous Ice Crushing Force for Wind Turbine Towers with Large Slopes

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