Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment最新文献_第8页

Surface gravity wave interaction with a submerged tunnel in the presence of a submerged wavy porous plate 水下波状多孔板存在时，表面重力波与水下隧道的相互作用

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-10-03 DOI: 10.1177/14750902231200156

Amar K Mohapatra, Trilochan Sahoo

{"title":"Surface gravity wave interaction with a submerged tunnel in the presence of a submerged wavy porous plate","authors":"Amar K Mohapatra, Trilochan Sahoo","doi":"10.1177/14750902231200156","DOIUrl":"https://doi.org/10.1177/14750902231200156","url":null,"abstract":"The present study deals with the surface gravity wave interaction of a submerged composite wavy porous plate in the presence of a tunnel placed at a finite distance under the assumption of small amplitude theory and a two-dimensional framework. To solve the boundary value problem, a numerical method using the multi-domain boundary element method (MDBEM) is implemented. Hydrodynamic characteristics of interest such as reflection coefficient and transmission coefficient are computed and studied for a wide range of dimensionless wavenumber and relative plate lengths. Various parametric studies are conducted to emphasize the effect of structural parameters like the number of relative ripple wavelengths, relative ripple amplitude, and relative submergence depth. Dimensionless wave force coefficients acting on the plate and the tunnel are calculated and investigated. The study reveals that the presence of composite wavy porous plate has a significant effect in the mitigation of wave-exerted force on the tunnel. Optimized results are shown for the efficient design of coupled breakwater and tunnel models, which can be used beneficially to protect against the severity of wave action in similar applications of ocean engineering in marine environments.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135696462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shallow Water Equations on modeling resonant waves evolution in a rough varying-width basin 粗糙变宽盆地中共振波演化的浅水方程模拟

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-30 DOI: 10.1177/14750902231198279

Ikha Magdalena, Nadhira Karima, Hany Q Rif’atin, Mohammad Farid

{"title":"Shallow Water Equations on modeling resonant waves evolution in a rough varying-width basin","authors":"Ikha Magdalena, Nadhira Karima, Hany Q Rif’atin, Mohammad Farid","doi":"10.1177/14750902231198279","DOIUrl":"https://doi.org/10.1177/14750902231198279","url":null,"abstract":"Wave resonance is known to be extremely damaging to the coastal areas surrounding it, particularly if the wave has tsunami-like features, as it can amplify the height and energy of the wave propagating to the shorelines. The installation of a rough material on the bottom is one of the solutions to protect the coast from resonance. In this study, we examine the resonant wave evolution and its frequency in a triangular or rectangular semi-closed basin using a varying-width Shallow Water Model. The basins are assumed to feature a rough bottom topography as well as an uneven width. The resonant frequencies are obtained analytically and numerically using separation of variables and the finite volume method on a staggered grid, respectively. The computational approach is also used to assess the evolution and properties of resonant waves. The numerical scheme is validated by comparing simulation results to analytical solutions, which show relatively good agreement. Further, it is discovered that a greater friction coefficient induces a higher resonant frequency in both types of basins but results in a lower maximum resonant wave amplitude. It is also found that the resonant frequencies of both types of varying-width basins are greater than those of the prior study’s constant-width basins. However, the effect of the variations in the maximum width of the basin on its resonant frequency is found to be insignificant. Moreover, sensitivity analyses of the basin’s length and maximum basin depth are presented, with the maximum water depth being directly proportional to the maximum wave amplitudes and resonant frequencies of both basins. In contrast, the resonant frequency decreases and the maximum wave amplitude fluctuates as the length of the basin grows.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136279477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cumulative buckling deformation of stiffened panel under cyclic loading 加筋板在循环荷载作用下的累积屈曲变形

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-30 DOI: 10.1177/14750902231198902

Beatrice Barsotti, Marco Gaiotti

引用次数: 0

Developing sustainable shipping and maritime transport: Multi-criteria analysis between emission abatement methods 发展可持续航运和海上运输:减排方法之间的多标准分析

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-30 DOI: 10.1177/14750902231199132

Elias Altarriba, Sirpa Rahiala, Taru Tanhuanpää, Marko Piispa

{"title":"Developing sustainable shipping and maritime transport: Multi-criteria analysis between emission abatement methods","authors":"Elias Altarriba, Sirpa Rahiala, Taru Tanhuanpää, Marko Piispa","doi":"10.1177/14750902231199132","DOIUrl":"https://doi.org/10.1177/14750902231199132","url":null,"abstract":"Annual emissions from maritime transport are contributing to the acceleration of global climate change and deteriorating local air quality. Shipowners need information on current and new emission reduction solutions to compare cost-effectiveness and environmental impact. However, emissions reduction in the maritime sector is a complex issue that should also consider the environmental impacts during fuel production and the full impact of different options during use. In this study, different fuel options and emission reduction methods are compared to rank the overall sustainability of alternatives. The overall sustainability assessment is based on the economic and environmental indexes generated, weighted, and aggregated. The results show that the sustainability index of LNG is often the best of the options compared. The difference in fuel prices determines much of the difference in economic performance between fuels. The results emphasize the importance of including several criteria when comparing more sustainable alternatives in shipping.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136336931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The necessity of time-based calculations for dimensioning of hybrid power supply systems of ships within the early design stage 船舶混合动力系统在设计初期进行基于时间的尺寸计算的必要性

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-30 DOI: 10.1177/14750902231199802

Christian Emmersberger, Björn Carstensen, Stefan Krüger, Adele Lübcke

{"title":"The necessity of time-based calculations for dimensioning of hybrid power supply systems of ships within the early design stage","authors":"Christian Emmersberger, Björn Carstensen, Stefan Krüger, Adele Lübcke","doi":"10.1177/14750902231199802","DOIUrl":"https://doi.org/10.1177/14750902231199802","url":null,"abstract":"While hybrid ship drive systems may offer a large potential, a thorough analysis is needed as it is strongly dependent on the operational profile. The fixing of costs during the early design stage, leads to the necessity of a precise evaluation of the systems efficiency within this phase. Conducting statistic-based calculations can be inadequate due to the time-dependent behavior of the battery. Moreover, idealized temporal data is often utilized for the design of battery supported ships. Therefore, this paper discusses the consequential inaccuracies using statistical or smoothed data. But also examines the potential of an advanced in-house developed statistical approach. For the examination, an internal developed method for dimensioning hybrid ship power systems is used. The paper shows that conducting statistical calculations lead to incorrect modeling of battery behavior, while smoothed power time-series can result in an overestimation of the battery lifetime (up to 21% less charge cycles).","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136341955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation on the hydro-acoustic characteristics of tandem cylinders with equal diameters 等直径串联式液压缸水声特性实验研究

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-30 DOI: 10.1177/14750902231200664

Sertaç Bulut, Selma Ergin

{"title":"Experimental investigation on the hydro-acoustic characteristics of tandem cylinders with equal diameters","authors":"Sertaç Bulut, Selma Ergin","doi":"10.1177/14750902231200664","DOIUrl":"https://doi.org/10.1177/14750902231200664","url":null,"abstract":"The investigation of the hydro-acoustic characteristics of tandem cylinders has a great importance because they occur in a variety of maritime applications that include submarines, offshore structures and seabed pipelines systems. Better understanding of the noise generation mechanism of tandem cylinders provides great contribution to reduce noise levels for many engineering applications. In this study, the hydro-acoustic characteristics of tandem cylinders with same diameter were experimentally investigated for five different distance ratios at Reynolds number of 1.6 × 10 4 . The diameter of the front and rear cylinders used in hydro-acoustic experiments is 0.02 m. It is observed that the main peak spectrum becomes narrower as the distance ratio increases. The width of the main peak spectrum also decreases as the flow regime transition from the reattachment regime to the separation regime. An increase in the distance ratio is found to correspond to an increase in the main peak frequency. The maximum sound pressure level is observed to attain its peak value at the critical distance ratio of 3.0. Notably, the maximum sound pressure level exhibits a substantial increase of approximately 6 dB as the distance ratio increases from 1.5 to 3.0, followed by a subsequent decrease of approximately 1 dB between the distance ratios of 3.0 and 6.0.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136279952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation of interference effects for the Delft 372 catamaran Delft 372双体船干涉效应的数值研究

4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-11 DOI: 10.1177/14750902231197886

Andrea Farkas, Nastia Degiuli, Ivan Tomljenović, Ivana Martić

引用次数: 0

Determination of particle paths and hydrodynamic forces of random wind forced nonlinear ocean waves 随机风强迫非线性海浪的粒子路径和水动力的测定

IF 1.8 4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-08 DOI: 10.1177/14750902231196812

Marten Hollm, L. Dostal, John D Carter, R. Seifried

引用次数: 0

LAW-IFF Net: A semantic segmentation method for recognition of marine current turbine blade attachments under blurry edges LAW-IFF网络:一种边缘模糊的海流涡轮叶片附件识别的语义分割方法

IF 1.8 4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-09-05 DOI: 10.1177/14750902231192145

Fei Qi, Tian-zheng Wang, Xiaohang Wang, Lisu Chen

{"title":"LAW-IFF Net: A semantic segmentation method for recognition of marine current turbine blade attachments under blurry edges","authors":"Fei Qi, Tian-zheng Wang, Xiaohang Wang, Lisu Chen","doi":"10.1177/14750902231192145","DOIUrl":"https://doi.org/10.1177/14750902231192145","url":null,"abstract":"Challenges exist in the power generation efficiency and safety of marine current turbines (MCTs), as the MCT blades are often attached by foreign objects when operating underwater. It is essential for the stable operation of an MCT to recognize attachments timely and accurately. However, underwater imaging suffers from blurry edges due to light attenuation and scattering. It is challenging for accurate recognition through underwater images since blurry edges result in unclear edge features. To alleviate this problem, LAW-IFF Net is proposed in this paper, which mainly contains two parts. Firstly, this paper proposes to transform the local averages of feature maps into weight matrices, namely the locally average weighting (LAW) mechanism. It is intended to alleviate the edge gradient reduction caused by blurry edges. Secondly, the proposed improved feature fusion (IFF) mechanism aims to overcome the deviation caused by the feature fusion of different attention branches based on spatial attention. At the same time, the lightweight networks are combined with the proposed method to improve the computation speed and ensure the timeliness of recognition. Experimental results on the MCT dataset show the superiority of the proposed method in terms of accuracy and speed of attachment recognition in images with blurry edges. The experimental results on publicly available datasets show the applicability of the proposed method to other underwater images.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75151303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Waste heat recovery assessment of triple heat-exchanger usage for ship main engine pre-heating and fresh water generation systems 船舶主机预热和淡水发电系统三联热交换器余热回收评价

IF 1.8 4区工程技术

Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment Pub Date : 2023-08-30 DOI: 10.1177/14750902231194794

Köksal Çolak, H. Ölmez, Betul Sarac

{"title":"Waste heat recovery assessment of triple heat-exchanger usage for ship main engine pre-heating and fresh water generation systems","authors":"Köksal Çolak, H. Ölmez, Betul Sarac","doi":"10.1177/14750902231194794","DOIUrl":"https://doi.org/10.1177/14750902231194794","url":null,"abstract":"In this study, the applicability, fuel saving and CO2 emission reducing potential of the triple heat-exchanger fed by the diesel generator exhaust gas with and without water steam have been studied for ship’s one and two main engines pre-heating and freshwater generation (FWG) cycles under port conditions with conducting energy and exergy analysis. The performance criteria (PC) and exergy efficiency (ε) values of the main engine pre-heating and freshwater generator systems of the Ro-Ro ship selected for the case study were determined by written Matlab 2021a codes merging CoolProp 6.4.2 database with Python. It was determined that even at the lowest operating load of the diesel generator (25%), the exhaust heat energy would be sufficient to preheat the main engine and generating fresh water with also saving fuel consumption. As a result, during the 12-h port period, each 1 kW heat energy reduction on steam will provide 0.0853 kg/h fuel saving in the boiler. Thus, 273 kg CO2 emission will be reduced for each kW of heat energy to be obtained. Considering the comparatively increased PC and ε values of whole system cycle containing common triple heat-exchanger for two main engines, it can be used conveniently and reliably on ships.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72528046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0