Pub Date : 2021-03-05DOI: 10.1080/20464177.2021.1894783
C. Edrington, Gokhan Ozkan, B. Papari, Dallas Perkins
Systems are being developed for power distribution on future navy ships to effectively incorporate advanced electrical systems requiring DC power. These islanded DC microgrids provide new challenges to the management of power flow throughout the system, and thus require advanced controls to accurately regulate and stabilise the systems during changing operational conditions. Therefore, adaptive droop control is proposed as a power management layer for these maritime DC microgrids. This paper reports on a method that uses adaptation of the controller parameters to account for uncertainty and changes in the system in order to accurately regulate the power sharing among distributed generation sources and to stabilise the bus voltage of the system. The proposed method is applied to a virtual prototype of a medium voltage direct current (MVDC) ship power system and demonstrated through notional operational scenarios to test the effectiveness of the control algorithm utilising controller hardware in the loop (CHIL) experimentation.
{"title":"Distributed adaptive power management for medium voltage ship power systems","authors":"C. Edrington, Gokhan Ozkan, B. Papari, Dallas Perkins","doi":"10.1080/20464177.2021.1894783","DOIUrl":"https://doi.org/10.1080/20464177.2021.1894783","url":null,"abstract":"Systems are being developed for power distribution on future navy ships to effectively incorporate advanced electrical systems requiring DC power. These islanded DC microgrids provide new challenges to the management of power flow throughout the system, and thus require advanced controls to accurately regulate and stabilise the systems during changing operational conditions. Therefore, adaptive droop control is proposed as a power management layer for these maritime DC microgrids. This paper reports on a method that uses adaptation of the controller parameters to account for uncertainty and changes in the system in order to accurately regulate the power sharing among distributed generation sources and to stabilise the bus voltage of the system. The proposed method is applied to a virtual prototype of a medium voltage direct current (MVDC) ship power system and demonstrated through notional operational scenarios to test the effectiveness of the control algorithm utilising controller hardware in the loop (CHIL) experimentation.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"21 1","pages":"281 - 296"},"PeriodicalIF":2.6,"publicationDate":"2021-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2021.1894783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47505531","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}
Pub Date : 2021-03-01DOI: 10.1080/20464177.2021.1893136
Jabbar Firouzi, H. Ghassemi, K. A. Vakilabadi
This paper numerically presented the effect of the cross-flow wake on the hydrodynamic performance of the ship propeller. The propeller is a typical high skewed propeller (HSP) of the training ship ‘Seiun-Maru’, whose experimental data have been frequently used by many researchers. The viscous flow is solved by an incompressible Reynolds Averaged Navier–Stokes (RANS) method using Ansys-CFX solver. The shear stress transport (SST) k–ω turbulence model is employed for the simulation of the propeller in a fully turbulent flow. The thrust and torque coefficients at 10 presented advance coefficients (between 0.1 and 1) showed good agreement comparing with experimental data. The numerical results are increased in the wake flows. The unsteady oscillating load of thrust and torque is presented and discussed for one blade and whole blades during one cycle at different cross-flow wakes and at advance coefficient (J = 0.85). Based on the numerical results, when the cross-flow wake is increased by 20% and 50%, the thrust at J = 0.85 are increased about 2.03% and 4.71% respectively and the torque at J = 0.85 is increased about 1.04% and 2.69%, respectively. Moreover, pressure distribution and streamlines are also presented and discussed.
{"title":"Effect of the cross-flow wake on the hydrodynamic performance of the HSP propeller by the CFD solver","authors":"Jabbar Firouzi, H. Ghassemi, K. A. Vakilabadi","doi":"10.1080/20464177.2021.1893136","DOIUrl":"https://doi.org/10.1080/20464177.2021.1893136","url":null,"abstract":"This paper numerically presented the effect of the cross-flow wake on the hydrodynamic performance of the ship propeller. The propeller is a typical high skewed propeller (HSP) of the training ship ‘Seiun-Maru’, whose experimental data have been frequently used by many researchers. The viscous flow is solved by an incompressible Reynolds Averaged Navier–Stokes (RANS) method using Ansys-CFX solver. The shear stress transport (SST) k–ω turbulence model is employed for the simulation of the propeller in a fully turbulent flow. The thrust and torque coefficients at 10 presented advance coefficients (between 0.1 and 1) showed good agreement comparing with experimental data. The numerical results are increased in the wake flows. The unsteady oscillating load of thrust and torque is presented and discussed for one blade and whole blades during one cycle at different cross-flow wakes and at advance coefficient (J = 0.85). Based on the numerical results, when the cross-flow wake is increased by 20% and 50%, the thrust at J = 0.85 are increased about 2.03% and 4.71% respectively and the torque at J = 0.85 is increased about 1.04% and 2.69%, respectively. Moreover, pressure distribution and streamlines are also presented and discussed.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"21 1","pages":"271 - 280"},"PeriodicalIF":2.6,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2021.1893136","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46727569","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}
Pub Date : 2020-12-30DOI: 10.1080/20464177.2020.1865250
Muhammad Rehan Naseer, E. Uddin, A. Mubashar, M. Sajid, Zaib Ali, K. Akhtar
ABSTRACT This paper is aimed to numerically investigate the hydrodynamic and hydro-acoustic behaviours of rotating underwater propeller operating in off-design flow conditions. The performance of the propeller is subjected to significant alteration, as it experiences flow, coming at an angle. For this purpose, numerical simulation is performed for the INSEAN Propeller E779A. Turbulence model based on the two-equation Reynolds Averaged Navier Stokes (RANS) turbulence model, i.e. k–ω SST (Shear Stress Transport) method is implied to assess hydrodynamic performance, while hydro-acoustic assessment in near field is calculated by coupling RANS with the Ffowcs Williams Hawking (FW-H) equation. Validation is performed by comparing the numerically computed results from the current study with the available experimental data in straight flow conditions and then the off-design conditions are modelled by using the combinations of three advance ratios with four different flow angles. As a result, distinct differences among the hydrodynamic and hydro-acoustic features are analysed. The hydrodynamic coefficients are compared, and their change is analysed in detail. For the hydro-acoustic analysis, sound pressure level, attenuation frequency and directivity analysis are conducted and based on these factors the effect of the off-design condition on the aquatic life is discussed, thus showing the strong influence of the off-design condition on the hydro-acoustics of the underwater water propeller.
摘要本文旨在对非设计工况下水下旋转螺旋桨的水动力和水声特性进行数值研究。螺旋桨的性能受到显著的改变，因为它经历了流动，在一个角度。为此，对INSEAN E779A螺旋桨进行了数值模拟。湍流模型基于两方程Reynolds平均Navier Stokes (RANS)湍流模型，即k -ω SST(剪切应力输运)方法进行水动力性能评估，近场水声评估采用RANS与Ffowcs Williams Hawking (FW-H)方程耦合计算。在直流条件下，将数值计算结果与现有的实验数据进行对比验证，然后采用三种超前比和四种不同气流角的组合来模拟非设计工况。分析了水动力特征和水声特征的显著差异。对水动力系数进行了比较，并详细分析了其变化规律。在水声分析中，通过声压级、衰减频率和指向性分析，讨论了非设计工况对水生生物的影响，从而显示了非设计工况对水下螺旋桨水声的强烈影响。
{"title":"Numerical investigation of hydrodynamic and hydro-acoustic performance of underwater propeller operating in off-design flow conditions","authors":"Muhammad Rehan Naseer, E. Uddin, A. Mubashar, M. Sajid, Zaib Ali, K. Akhtar","doi":"10.1080/20464177.2020.1865250","DOIUrl":"https://doi.org/10.1080/20464177.2020.1865250","url":null,"abstract":"ABSTRACT This paper is aimed to numerically investigate the hydrodynamic and hydro-acoustic behaviours of rotating underwater propeller operating in off-design flow conditions. The performance of the propeller is subjected to significant alteration, as it experiences flow, coming at an angle. For this purpose, numerical simulation is performed for the INSEAN Propeller E779A. Turbulence model based on the two-equation Reynolds Averaged Navier Stokes (RANS) turbulence model, i.e. k–ω SST (Shear Stress Transport) method is implied to assess hydrodynamic performance, while hydro-acoustic assessment in near field is calculated by coupling RANS with the Ffowcs Williams Hawking (FW-H) equation. Validation is performed by comparing the numerically computed results from the current study with the available experimental data in straight flow conditions and then the off-design conditions are modelled by using the combinations of three advance ratios with four different flow angles. As a result, distinct differences among the hydrodynamic and hydro-acoustic features are analysed. The hydrodynamic coefficients are compared, and their change is analysed in detail. For the hydro-acoustic analysis, sound pressure level, attenuation frequency and directivity analysis are conducted and based on these factors the effect of the off-design condition on the aquatic life is discussed, thus showing the strong influence of the off-design condition on the hydro-acoustics of the underwater water propeller.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"21 1","pages":"224 - 233"},"PeriodicalIF":2.6,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2020.1865250","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43466207","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1665818
S. Patel, B. Kuriachen, Raman Nateriya
The current research was a comparative study of reinforced ceramic particles and mixing proportion on the microstructural and slurry erosive characteristics for fabricated composites. Dual reinforced particle composites were fabricated by adding combinations of numerous wt% of titanium carbide (TiC) and zircon sand (ZrSiO4) to aluminium die-casting (ADC12) alloy matrix composites. ADC12 alloy composite with titanium carbide and zircon sand samples were also prepared for comparison of dual reinforcement particles on microstructural features and wear behaviour in various slurry concentrations. Titanium carbide (44–60 µm) and zircon sand (20–33 µm) particles are reinforced in the alloy by the two-step stir-casting method. Slurry erosion wear study reveals that the dual particle reinforcement enhances the wear resistance as compared to single-particle reinforcement if mixed in a definite proportion. The study also indicates that a combination of 15% reinforcement of titanium carbide and zircon sand particles in the ratio of 10 and 5 wt% into the composite exhibits better microhardness and wear resistance as compared to other combination.
{"title":"Slurry erosive wear and microhardness characteristics with coarse silica sand of dual reinforced particles ADC12 alloy composites","authors":"S. Patel, B. Kuriachen, Raman Nateriya","doi":"10.1080/20464177.2019.1665818","DOIUrl":"https://doi.org/10.1080/20464177.2019.1665818","url":null,"abstract":"The current research was a comparative study of reinforced ceramic particles and mixing proportion on the microstructural and slurry erosive characteristics for fabricated composites. Dual reinforced particle composites were fabricated by adding combinations of numerous wt% of titanium carbide (TiC) and zircon sand (ZrSiO4) to aluminium die-casting (ADC12) alloy matrix composites. ADC12 alloy composite with titanium carbide and zircon sand samples were also prepared for comparison of dual reinforcement particles on microstructural features and wear behaviour in various slurry concentrations. Titanium carbide (44–60 µm) and zircon sand (20–33 µm) particles are reinforced in the alloy by the two-step stir-casting method. Slurry erosion wear study reveals that the dual particle reinforcement enhances the wear resistance as compared to single-particle reinforcement if mixed in a definite proportion. The study also indicates that a combination of 15% reinforcement of titanium carbide and zircon sand particles in the ratio of 10 and 5 wt% into the composite exhibits better microhardness and wear resistance as compared to other combination.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"19 1","pages":"240 - 248"},"PeriodicalIF":2.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2019.1665818","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43969206","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1633881
S. Wu, T. Zhang, Z. H. Li, J. Jia, Y. Deng, P. Xu, Y. Shao, D. Y. Deng, B. Hu
Pressure sensor used in marine hydrographic survey is an important device for the deep sea detection, the tsunami forecast and the marine engineering. Owing to its mature technology process and low production cost, silicon piezoresistive sensor is widely applied in the field of industrial pressure measurement. However, its temperature effect can result in non-negligible dynamic error, which cannot meet requirement of deep sea environment. The silicon-on-sapphire pressure sensor based on stress cup structure is presented. The output voltage values show a high deviation in the range of −6∼50°C due to temperature drift. In order to minimise this temperature effect, a temperature compensation algorithm is proposed to realise 0.03% accuracy in the full scale 60 MPa range. Compared with a reference commercial sensor in deep sea experiment, the test pressure sensors exhibit minor error, excellent similarity and coherence. This numerical method provides a new research direction for environmental self-adaptive sensor. It can be emphasised that this sensor will have a good application prospect in unattended long-term ocean observation system.
{"title":"Temperature characteristic and compensation algorithm for a marine high accuracy piezoresistive pressure sensor","authors":"S. Wu, T. Zhang, Z. H. Li, J. Jia, Y. Deng, P. Xu, Y. Shao, D. Y. Deng, B. Hu","doi":"10.1080/20464177.2019.1633881","DOIUrl":"https://doi.org/10.1080/20464177.2019.1633881","url":null,"abstract":"Pressure sensor used in marine hydrographic survey is an important device for the deep sea detection, the tsunami forecast and the marine engineering. Owing to its mature technology process and low production cost, silicon piezoresistive sensor is widely applied in the field of industrial pressure measurement. However, its temperature effect can result in non-negligible dynamic error, which cannot meet requirement of deep sea environment. The silicon-on-sapphire pressure sensor based on stress cup structure is presented. The output voltage values show a high deviation in the range of −6∼50°C due to temperature drift. In order to minimise this temperature effect, a temperature compensation algorithm is proposed to realise 0.03% accuracy in the full scale 60 MPa range. Compared with a reference commercial sensor in deep sea experiment, the test pressure sensors exhibit minor error, excellent similarity and coherence. This numerical method provides a new research direction for environmental self-adaptive sensor. It can be emphasised that this sensor will have a good application prospect in unattended long-term ocean observation system.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"19 1","pages":"207 - 214"},"PeriodicalIF":2.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2019.1633881","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42382405","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1572703
Mohamed Essallamy, Alaa Abdel Bari, M. Kotb
ABSTRACT Suez Canal is one of the shortest navigational routes between east and west. Vessels that transit the Canal should normally save distance, time and operating cost. During the current economic recession and low fuel prices, longer shipping routes may be chosen to avoid the Canal transit fees. Harsh weather conditions may be encountered along these lengthy routes resulting in higher stresses and structural fatigue damage on ship’s hull, which would impact structural safety and affects the cost of ship maintenance. This paper quantifies ship structural fatigue damage along the routes: Suez Canal transit versus the Cape of Good Hope. Several voyages of an Aframax tanker along these routes are selected and evaluated for fatigue damage using a route-specific spectral fatigue damage assessment approach. Fatigue accumulation during the tanker lifetime, for each trade route, is computed as the sum of all the encountered sea states having caused fatigue damage along that route. Results are presented as fatigue damage and fatigue life for each trade route. Results show that in addition to saving in distance and time, less accumulated fatigue is achieved along the Suez Canal route.
{"title":"Spectral fatigue analyses comparison study: Suez Canal vs. Cape of Good Hope Arab Academy for Science, Technologies and Maritime Transport (AASTMT)","authors":"Mohamed Essallamy, Alaa Abdel Bari, M. Kotb","doi":"10.1080/20464177.2019.1572703","DOIUrl":"https://doi.org/10.1080/20464177.2019.1572703","url":null,"abstract":"ABSTRACT Suez Canal is one of the shortest navigational routes between east and west. Vessels that transit the Canal should normally save distance, time and operating cost. During the current economic recession and low fuel prices, longer shipping routes may be chosen to avoid the Canal transit fees. Harsh weather conditions may be encountered along these lengthy routes resulting in higher stresses and structural fatigue damage on ship’s hull, which would impact structural safety and affects the cost of ship maintenance. This paper quantifies ship structural fatigue damage along the routes: Suez Canal transit versus the Cape of Good Hope. Several voyages of an Aframax tanker along these routes are selected and evaluated for fatigue damage using a route-specific spectral fatigue damage assessment approach. Fatigue accumulation during the tanker lifetime, for each trade route, is computed as the sum of all the encountered sea states having caused fatigue damage along that route. Results are presented as fatigue damage and fatigue life for each trade route. Results show that in addition to saving in distance and time, less accumulated fatigue is achieved along the Suez Canal route.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"19 1","pages":"257 - 265"},"PeriodicalIF":2.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2019.1572703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47506267","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1638698
Adeleh Graylee, M. Yousefifard
This paper presents a numerical investigation on the hydrodynamic performance of sandglass-type FPSOs with four different cross sections. In order to estimate the hydrodynamic performance and utilise the results in the design stage of FPSOs, a frequency-domain numerical simulation program, ANSYS/AQWA software package, has been used. Numerical results were compared with experimental data and good agreement has been achieved in small amplitude regular wave cases. Based on the simulation results, it is concluded that polyhedral cross sections (especially 10-sided cross section) provide similar hydrodynamic performance compared with circular cross section in heave and pitch motions for all ranges of wave frequency. Therefore, it is possible to use these types of cross sections for FPSOs because of manufacturing simplicity.
{"title":"The effects of different cross sections on the hydrodynamic behaviour of sandglass-type FPSOs exposed to regular waves","authors":"Adeleh Graylee, M. Yousefifard","doi":"10.1080/20464177.2019.1638698","DOIUrl":"https://doi.org/10.1080/20464177.2019.1638698","url":null,"abstract":"This paper presents a numerical investigation on the hydrodynamic performance of sandglass-type FPSOs with four different cross sections. In order to estimate the hydrodynamic performance and utilise the results in the design stage of FPSOs, a frequency-domain numerical simulation program, ANSYS/AQWA software package, has been used. Numerical results were compared with experimental data and good agreement has been achieved in small amplitude regular wave cases. Based on the simulation results, it is concluded that polyhedral cross sections (especially 10-sided cross section) provide similar hydrodynamic performance compared with circular cross section in heave and pitch motions for all ranges of wave frequency. Therefore, it is possible to use these types of cross sections for FPSOs because of manufacturing simplicity.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"19 1","pages":"197 - 206"},"PeriodicalIF":2.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2019.1638698","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43215755","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1655135
Kun Yang, Biao Hu, R. Malekian, Zhixiong Li
The safe operation of marine turbine generators is a crucial concern in industries and academics. It is always important to monitor the health status of marine turbine generators. The lubricant oil usually carries abundant information on the turbine operation conditions. Various oil parameters of the turbines have been used in the existing monitoring systems. However, many of them conflict with each other by contrary detection results. Hence, it should eliminate the redundant oil parameters for efficient condition monitoring. Although many research studies addressed the redundant feature reduction issue using principal component analysis (PCA), PCA is designed for features with a linear relationship, which is not the case in marine turbine generator monitoring. This paper proposes a new nonlinear analysis method, the improved control-limit based PCA, to extract distinct failure indicators from the oil parameters of marine turbine generators. The contribution of this method is that the Hotelling statistic and Q statistic are combined to calculate a fixed control limit for PCA. The ability of the improved PCA to dealing with nonlinearity has been significantly enhanced by the proposed method. Experimental validation demonstrates that the extracted failure indicator using the proposed method is more effective than existing monitoring indexes with respect to fault detection accuracy.
{"title":"An improved control-limit-based principal component analysis method for condition monitoring of marine turbine generators","authors":"Kun Yang, Biao Hu, R. Malekian, Zhixiong Li","doi":"10.1080/20464177.2019.1655135","DOIUrl":"https://doi.org/10.1080/20464177.2019.1655135","url":null,"abstract":"The safe operation of marine turbine generators is a crucial concern in industries and academics. It is always important to monitor the health status of marine turbine generators. The lubricant oil usually carries abundant information on the turbine operation conditions. Various oil parameters of the turbines have been used in the existing monitoring systems. However, many of them conflict with each other by contrary detection results. Hence, it should eliminate the redundant oil parameters for efficient condition monitoring. Although many research studies addressed the redundant feature reduction issue using principal component analysis (PCA), PCA is designed for features with a linear relationship, which is not the case in marine turbine generator monitoring. This paper proposes a new nonlinear analysis method, the improved control-limit based PCA, to extract distinct failure indicators from the oil parameters of marine turbine generators. The contribution of this method is that the Hotelling statistic and Q statistic are combined to calculate a fixed control limit for PCA. The ability of the improved PCA to dealing with nonlinearity has been significantly enhanced by the proposed method. Experimental validation demonstrates that the extracted failure indicator using the proposed method is more effective than existing monitoring indexes with respect to fault detection accuracy.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"19 1","pages":"249 - 256"},"PeriodicalIF":2.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2019.1655135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48738221","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1665330
O. Yüksel, Burak Köseoğlu
In this paper, a single-stage, horizontal type centrifugal pump, which can be used in a chemical tanker’s cargo operations, was modelled with MATLAB/Simulink software. The modelled pump was run with seven different fluids handled in chemical tankers which are ethyl alcohol, N-Propyl alcohol, phenol, chloroform, castor oil, 55% nitric acid and water. Therefore, the pump’s performance curves and data sets were obtained for each situation. After these, a neural network was created with MATLAB/ Neural Network Fitting Tool application. Inputs of the network were volumetric flow, head, shaft power, torque, and net positive suction head. The output was the pump efficiency and it is estimated for each fluid from the numeric data. Mean squared error was very close to zero (1.1817e-6) and R 2 provided a prediction accuracy of 99.996%. According to these results, artificial neural network (ANN) had a satisfactory performance to predict the efficiency of a chemical tanker’s centrifugal cargo pump.
{"title":"Modelling and performance prediction of a centrifugal cargo pump on a chemical tanker","authors":"O. Yüksel, Burak Köseoğlu","doi":"10.1080/20464177.2019.1665330","DOIUrl":"https://doi.org/10.1080/20464177.2019.1665330","url":null,"abstract":"In this paper, a single-stage, horizontal type centrifugal pump, which can be used in a chemical tanker’s cargo operations, was modelled with MATLAB/Simulink software. The modelled pump was run with seven different fluids handled in chemical tankers which are ethyl alcohol, N-Propyl alcohol, phenol, chloroform, castor oil, 55% nitric acid and water. Therefore, the pump’s performance curves and data sets were obtained for each situation. After these, a neural network was created with MATLAB/ Neural Network Fitting Tool application. Inputs of the network were volumetric flow, head, shaft power, torque, and net positive suction head. The output was the pump efficiency and it is estimated for each fluid from the numeric data. Mean squared error was very close to zero (1.1817e-6) and R 2 provided a prediction accuracy of 99.996%. According to these results, artificial neural network (ANN) had a satisfactory performance to predict the efficiency of a chemical tanker’s centrifugal cargo pump.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"19 1","pages":"278 - 290"},"PeriodicalIF":2.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/20464177.2019.1665330","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43788393","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}
Pub Date : 2020-11-18DOI: 10.1080/20464177.2019.1670994
Muhammet Gul
Ports are complex systems that play a crucial role in the transportation of maritime-related products and services. Since ports face various safety issues in design, installation, operation and maintenance processes, there are many aspects open for improvement in Occupational Health and Safety risk assessment and it is required to deal with risks, reduce them to an acceptable level and control. To struggle with emerging risks and manage this process better, a risk assessment framework is proposed for ports in this study. A case study is performed in a Turkish international port authority using the proposed framework. Fuzzy Analytic Hierarchy Process (FAHP), which is a commonly used fuzzy multi-criteria decision-making method, was used in weighting two risk factors: likelihood and severity. The orders of priority of hazards were then determined by a fuzzy-based VIKOR method based on the output of FAHP. The proposed framework overcomes some drawbacks, including a lack of assignment on the weight to two risk assessment factors and lack of the high dependence of the prioritisation on the experts’ opinions. To validate the results, a sensitivity analysis was conducted. In conclusion, the study contributes to the applicability of the proposed framework to assess the risks in ports and provides a distinct risk prioritisation.
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