Volume 7: Polar and Arctic Sciences and Technology最新文献_第4页

Dimensioning of Rudder Systems for Ice Class Ships 冰级船舵系统尺寸

Volume 7: Polar and Arctic Sciences and Technology Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18728

Robert Hindley, Jillian Adams, Ville Valtonen, Chi-Hyun Sung

{"title":"Dimensioning of Rudder Systems for Ice Class Ships","authors":"Robert Hindley, Jillian Adams, Ville Valtonen, Chi-Hyun Sung","doi":"10.1115/omae2020-18728","DOIUrl":"https://doi.org/10.1115/omae2020-18728","url":null,"abstract":"\u0000 Rudder systems (rudder control surfaces and steering gear) are a safety critical element of ships operating in ice-covered waters. Icebreaking ships equipped with single rudders are particularly vulnerable considering the remote and often isolated locations in which they operate. The IACS Polar Class Rules were developed as a set of harmonized requirements for ships operating in polar waters. First published in 2006 the rules contain requirements for dimensioning the hull structure and propulsion machinery to resist ice loads. There are however no specific requirements for rudders — the rules simply require appendages to be dimensioned using the hull ice load. This paper presents a series of studies aimed at providing guidance on dimensioning rudders and steering gear systems for operation in ice. Using existing ship reference cases and rudder ice loading scenarios found in previous rules and guidelines a simplified set of design approaches are presented. These approaches are evaluated with Finite Element Analysis and compared with selected measured full-scale data and damage incidents. Guidance is provided on system protection mechanisms for the steering gear under these design and over-load cases. In addition, a comparison is made between the results and those derived from using the hull area design pressures in the current IACS rules.","PeriodicalId":108271,"journal":{"name":"Volume 7: Polar and Arctic Sciences and Technology","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132420241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Peridynamic Analysis of Fragmentation of Ice Plate Under Explosive Loading With Thermal Effects 热效应下爆炸载荷作用下冰板破碎的周动力分析

Volume 7: Polar and Arctic Sciences and Technology Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18731

Yehui Zhang, Chao Wang, Chun-yu Guo, L. Tao

{"title":"Peridynamic Analysis of Fragmentation of Ice Plate Under Explosive Loading With Thermal Effects","authors":"Yehui Zhang, Chao Wang, Chun-yu Guo, L. Tao","doi":"10.1115/omae2020-18731","DOIUrl":"https://doi.org/10.1115/omae2020-18731","url":null,"abstract":"\u0000 Along with the development in arctic region, the icebreaking technologies are gradually becoming the focus. As one of the most powerful and effective way to breaking ice, especially in the ability to solve ice jams, the study of the behaviour of the sea and river ice under dynamic loads is an urgent subject of scientific research and it attracts extensive attention. In addition, the temperature change in the process of ice failure cannot be neglected since that temperature plays an important role in the mechanical properties of the ice. In this study, a fully coupled thermoelastic ordinary state-based Peridynamic model is employed to investigate fragmentation of ice cover subjected to an underwater explosion. Both the deformation effect on the thermal effects and the thermal effects on deformation are taken into consideration. The pressure shocks generated by the underwater explosion are applied to the bottom surface of the ice cover for non-uniform load distributions. Crack propagation paths are investigated, the damage is predicted and compared with existing experimental results. The corresponding temperature distributions are also examined. Furthermore, the ice failure mode in both the top surface and the bottom surface of the ice sheet is investigated.","PeriodicalId":108271,"journal":{"name":"Volume 7: Polar and Arctic Sciences and Technology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122023891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Using Isotropic and Anisotropic Models to Determine Solar Module Tilt to Maximize Incident Energy and PV Electricity Output on the Alaska North Slope 使用各向同性和各向异性模型来确定太阳能组件倾角，以最大限度地提高阿拉斯加北坡的入射能量和光伏发电输出

Volume 7: Polar and Arctic Sciences and Technology Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18103

Kurt Wurthmann

{"title":"Using Isotropic and Anisotropic Models to Determine Solar Module Tilt to Maximize Incident Energy and PV Electricity Output on the Alaska North Slope","authors":"Kurt Wurthmann","doi":"10.1115/omae2020-18103","DOIUrl":"https://doi.org/10.1115/omae2020-18103","url":null,"abstract":"\u0000 The Alaska North Slope is a pristine and fragile arctic environment that needs protection. The present article illustrates the application of isotropic and anisotropic models for predicting solar radiation on photovoltaic (PV) modules (and, hence, potential electricity output) for different angles of inclination (or tilt) in Utqiagvik Alaska. The anisotropic model is shown to provide higher, albeit more accurate, predictions of solar radiation since it includes all of the measures used in the isotropic model, but provides a more comprehensive representation of the diffuse component. Specifically, the anisotropic model includes not only the isotropic part of diffuse radiation, but also the circumsolar and horizon brightening parts. A PV array angle of tilt of 55 degrees is shown to provide the greatest total amount of incident solar radiation for the entire year, based on both the isotropic and anisotropic models. However, both models also indicate that angles of tilt that are steeper than 55 degrees result in slightly greater amounts of incident solar radiation during the late-winter, early-spring, and mid-fall months; while angles of tilt that are flatter than 55 degrees result in slightly greater amounts of incident solar radiation during the summer and early-fall months. It is shown that a PV system with a moderately sized array, tilted at the fixed angle of 55 degrees, could provide more than 50 percent of the total annual electricity needs for homes in Utqiagvik Alaska.","PeriodicalId":108271,"journal":{"name":"Volume 7: Polar and Arctic Sciences and Technology","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121406180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sea Ice Thickness Forecast Performance in the Barents Sea 巴伦支海海冰厚度预报性能

Volume 7: Polar and Arctic Sciences and Technology Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18039

Laura Hume-Wright, E. Fiedler, N. Fournier, Joana Mendes, E. Blockley, Matthew J. Martin, K. Eik

{"title":"Sea Ice Thickness Forecast Performance in the Barents Sea","authors":"Laura Hume-Wright, E. Fiedler, N. Fournier, Joana Mendes, E. Blockley, Matthew J. Martin, K. Eik","doi":"10.1115/omae2020-18039","DOIUrl":"https://doi.org/10.1115/omae2020-18039","url":null,"abstract":"\u0000 The presence of sea ice has a major impact on the safety, operability and efficiency of Arctic operations and navigation. While satellite-based sea ice charting is routinely used for tactical ice management, the marine sector does not yet make use of existing operational sea ice thickness forecasting. However, data products are now freely available from the Copernicus Marine Environment Monitoring Service (CMEMS). Arctic asset managers and vessels’ crews are generally not aware of such products, or these have so far suffered from insufficient accuracy, verification, resolution and adequate format, in order to be well integrated within their existing decision-making processes and systems.\u0000 The objective of the EU H2020 project “Safe maritime operations under extreme conditions: The Arctic case” (SEDNA) is to improve the safety and efficiency of Arctic navigation. This paper presents a component focusing on the validation of an adaption of the 7-day sea ice thickness forecast from the UK Met Office Forecast Ocean Assimilation Model (FOAM). The experimental forecast model assimilates the CryoSat-2 satellite’s ice freeboard daily data.\u0000 Forecast skill is evaluated against unique in-situ data from five moorings deployed between 2015 and 2018 by the Barents Sea Metocean and Ice Network (BASMIN) Joint Industry Project. The study shows that the existing FOAM forecasts produce adequate results in the Barents Sea. However, while studies have shown the assimilation of CryoSat-2 data is effective for thick sea ice conditions, this did not improve forecasts for the thinner sea ice conditions of the Barents Sea.","PeriodicalId":108271,"journal":{"name":"Volume 7: Polar and Arctic Sciences and Technology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123005682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Ship Resistance When Operating in Floating Ice Floes: A Derivation of Empirical Equations 船舶在浮冰中运行时的阻力:经验方程的推导

Volume 7: Polar and Arctic Sciences and Technology Pub Date : 2020-07-03 DOI: 10.1115/omae2020-19294

Luofeng Huang, C. Ryan, B. Igrec, Andrea Grech La Rosa, D. Stagonas, G. Thomas, Zhiyuan Li, Minghao Li, J. Ringsberg

{"title":"Ship Resistance When Operating in Floating Ice Floes: A Derivation of Empirical Equations","authors":"Luofeng Huang, C. Ryan, B. Igrec, Andrea Grech La Rosa, D. Stagonas, G. Thomas, Zhiyuan Li, Minghao Li, J. Ringsberg","doi":"10.1115/omae2020-19294","DOIUrl":"https://doi.org/10.1115/omae2020-19294","url":null,"abstract":"\u0000 With the effects of global warming, the Arctic is presenting a new environment where numerous ice floes are floating on the open sea surface. Whilst this has unprecedentedly improved Arctic shipping navigability and brought about significant opportunities, the interaction of such floes with ships has yet to be understood, thus hindering appropriate assessment of corresponding ship performance. This paper presents work on developing empirical equations to estimate the effects of such floes on ship resistance. Based on extensive data from validated computational simulations, the ice-floe resistance has been shown to correlate with ship beam, ship speed, ice concentration, ice thickness and floe diameter, and the regression powers of each the parameter on resistance are ascertained for a container ship. This leads to an empirical equation that can immediately predict ice-floe resistance in a given condition. The proposed approach has the potential to facilitate propulsion power estimates for Arctic shipping, as well as providing valuable insights into ship design for these environmental conditions.","PeriodicalId":108271,"journal":{"name":"Volume 7: Polar and Arctic Sciences and Technology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123343768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4