Day 1 Wed, October 04, 2017最新文献

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Correlation Between the Calculated and On-board Measured Vibration and Noise Levels for a Passenger Ship 客船振动噪声级计算与实测的相关性研究
Day 1 Wed, October 04, 2017 Pub Date : 2017-10-04 DOI: 10.5957/attc-2017-0005
Valter Cergol, Alessandro Toson, Romualdo Di Giovanni
{"title":"Correlation Between the Calculated and On-board Measured Vibration and Noise Levels for a Passenger Ship","authors":"Valter Cergol, Alessandro Toson, Romualdo Di Giovanni","doi":"10.5957/attc-2017-0005","DOIUrl":"https://doi.org/10.5957/attc-2017-0005","url":null,"abstract":"A comparative analysis is performed between the numerical calculations and the measurements carried out on board regarding noise and vibration levels on passenger ships. Based on the comparison, the accuracy of the results obtained with the numerical calculations is assessed and discussed.","PeriodicalId":348407,"journal":{"name":"Day 1 Wed, October 04, 2017","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117077359","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
Efficient sampling for extreme event statistics of the wave loads on an offshore platform 海上平台波浪荷载极端事件统计的有效采样
Day 1 Wed, October 04, 2017 Pub Date : 2017-10-04 DOI: 10.5957/attc-2017-0049
M. A. Mohamad, T. Sapsis
{"title":"Efficient sampling for extreme event statistics of the wave loads on an offshore platform","authors":"M. A. Mohamad, T. Sapsis","doi":"10.5957/attc-2017-0049","DOIUrl":"https://doi.org/10.5957/attc-2017-0049","url":null,"abstract":"We develop a method for the evaluation of extreme event statistics associated with nonlinear dynamical systems, using a very small number of samples. From an initial dataset of design points, we formulate a sequential strategy that provides the ‘next-best’ data point (set of parameters) that when evaluated results in improved estimates of the probability density function (pdf) for a scalar quantity of interest. The approach utilizes Gaussian process regression to perform Bayesian inference on the parameter-to-observation map describing the quantity of interest. We then approximate the desired pdf along with uncertainty bounds utilizing the posterior distribution of the inferred map. The ‘next-best’ design point is sequentially determined through an optimization procedure that selects the point in parameter space that maximally reduces uncertainty between the estimated bounds of the pdf prediction. Since the optimization process utilizes only information from the inferred map it has minimal computational cost. Moreover, the special form of the criterion emphasizes the tails of the pdf. The method is applied to estimate the extreme event statistics for a very high-dimensional system with millions degrees of freedom: an offshore platform subjected to three-dimensional irregular waves. It is demonstrated that the developed approach can accurately determine the extreme event statistics using orders of magnitude smaller number of samples compared with traditional approaches.","PeriodicalId":348407,"journal":{"name":"Day 1 Wed, October 04, 2017","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121821784","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
An Optimization Study of TriSWACH Side-Hull Position for Minimum Resistance in Calm Water 静水条件下TriSWACH舷侧最小阻力位置优化研究
Day 1 Wed, October 04, 2017 Pub Date : 2017-10-04 DOI: 10.5957/attc-2017-0053
Yufei Ai, Yulin Zhao, R. Datla
{"title":"An Optimization Study of TriSWACH Side-Hull Position for Minimum Resistance in Calm Water","authors":"Yufei Ai, Yulin Zhao, R. Datla","doi":"10.5957/attc-2017-0053","DOIUrl":"https://doi.org/10.5957/attc-2017-0053","url":null,"abstract":"TriSWACH is a promising novel hull form for its reduced resistance, larger deck area and good seakeeping performance. This paper aims to determine an optimal sidehull position for TriSWACH based on the minimum resistance in calm water. STAR-CCM+, a RANS-based commercial CFD tool and a potential flow code Michelet are compared in their calculations of resistance. Four different side-hull positions of the TriSWACH operated within Froude number from 0.1 to 0.5 with increment 0.05 are considered for the numerical simulations. The simulation results are further validated by the model tests performed in Stevens Institute of Technology Davidson Laboratory towing tank. The comparison shows that STAR-CCM+ RANS codes can predict TriSWACH’s hydrodynamic characteristics in calm water with high accuracy. Finally, TriSWACH's optimal side-hulls’ position was discussed based on calm water resistance within different Froude number ranges.","PeriodicalId":348407,"journal":{"name":"Day 1 Wed, October 04, 2017","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127526203","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
Innovative Experimental Investigation on the Influences of the Reynolds Number 雷诺数影响的创新实验研究
Day 1 Wed, October 04, 2017 Pub Date : 2017-10-04 DOI: 10.5957/attc-2017-0056
J. Gu, A. C. Fernandes
{"title":"Innovative Experimental Investigation on the Influences of the Reynolds Number","authors":"J. Gu, A. C. Fernandes","doi":"10.5957/attc-2017-0056","DOIUrl":"https://doi.org/10.5957/attc-2017-0056","url":null,"abstract":"The influences of Re (Reynolds number) on the response of vortex induced vibration (VIV) have been studied by previous researches, which indicate the influences should not be ignored. However, due to the limitation of experimental facilities and complexity of the cases, the explicit influence of Re on VIV is still not fully known. Meanwhile, the industry standards also do not supply design reference taking account of Re effects quantitatively. In present work, an innovative dimensionless parameter (denoted as “inertia-viscosity”) is proposed to displace the Re in the dimensionless system, in order to clarify the individual effect of Re. With this method, comparing tests are concisely carried out, and the effectiveness and feasibility are demonstrated. Through the comparing of tests, several remarkable results are obtained.","PeriodicalId":348407,"journal":{"name":"Day 1 Wed, October 04, 2017","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131294491","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
Lessons Learned from Full-Scale Seakeeping Trial Acceleration Data for HighSpeed Planing Craft and Implications for Scale Model Testing 高速规划艇全尺寸耐波性试验加速度数据的经验教训及其对比例模型试验的启示
Day 1 Wed, October 04, 2017 Pub Date : 2017-10-03 DOI: 10.5957/attc-2017-0011
T. Coats, Michael R. Riley
{"title":"Lessons Learned from Full-Scale Seakeeping Trial Acceleration Data for HighSpeed Planing Craft and Implications for Scale Model Testing","authors":"T. Coats, Michael R. Riley","doi":"10.5957/attc-2017-0011","DOIUrl":"https://doi.org/10.5957/attc-2017-0011","url":null,"abstract":"This paper summarizes lessons learned from analyzing acceleration data recorded during full-scale seakeeping trials of high speed craft. Applications using a consistent maximum wave impact load approach in different areas of interest, including hull structure, shock isolation seat evaluation, and equipment ruggedness criteria are presented. The lessons learned and the maximum load applications suggest that there are implications for scale model testing and computational fluid dynamics.","PeriodicalId":348407,"journal":{"name":"Day 1 Wed, October 04, 2017","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116472852","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
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