Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan最新文献_第2页

Hydrodynamic Analysis of High-Speed Vessels in Shallow and Deep Water Using CFD 基于CFD的高速船舶浅水和深水水动力分析

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-05-04 DOI: 10.14710/kapal.v20i2.52141

Budi Utomo, S. Samuel, P. Manik, Chiquita Azaria, Syaiful Tambah Putra Ahmad, Z. Yongxing

{"title":"Hydrodynamic Analysis of High-Speed Vessels in Shallow and Deep Water Using CFD","authors":"Budi Utomo, S. Samuel, P. Manik, Chiquita Azaria, Syaiful Tambah Putra Ahmad, Z. Yongxing","doi":"10.14710/kapal.v20i2.52141","DOIUrl":"https://doi.org/10.14710/kapal.v20i2.52141","url":null,"abstract":"Differences in the depth of the water surface affect the hydrodynamics of the ship so there is a possibility that the ship will behave differently in deep water and shallow water. The surface flow generated by the hull varies radically due to the speed of the ship and the effects of water depth. At a certain speed, the ship experiences a critical speed condition, which will affect the total resistance of the ship. This study examines the Fridsma ship's resistance to differences in water depth at several speeds. Numerical computation is used in this study to simulate the characteristics of a planing hull form. The Finite Volume Method (FMV) is used to observe fluid flow due to differences in water level with the RANS (Reynolds-Averaged Navier - Stokes) equation in predicting ship resistance. K-ε was modeled as a turbulent and volume of fluid (VOF) model to represent the air and water phases. This study uses a morphing grid mesh to analyze the shape of the hull in numerical simulations. The total resistance of Fridsma in shallow waters increased at each speed when compared to the total resistance in deep waters. On average in deep waters, it can reduce the total resistance by around 22.34% compared to shallow waters. This is caused by the squat phenomenon that occurs in the hull.","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126819254","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

Study of Towing Lug Strength in 300 feet Barge at Docking Process 300英尺驳船靠泊过程拖拽强度研究

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-04-29 DOI: 10.14710/kapal.v20i2.52624

A. Arifuddin, A. I. Wulandari, Mohammad Ardha Wiku Wicaksono

{"title":"Study of Towing Lug Strength in 300 feet Barge at Docking Process","authors":"A. Arifuddin, A. I. Wulandari, Mohammad Ardha Wiku Wicaksono","doi":"10.14710/kapal.v20i2.52624","DOIUrl":"https://doi.org/10.14710/kapal.v20i2.52624","url":null,"abstract":"Currently, the docking of ships or barges has been dominated by the airbag system by relying on the pull of the winch. For the Kalimantan area, the barge is generally pulled using a winch during docking. The structures that play a role when pulling the barge are towing brackets, slings, pulleys, and winches. In this paper, the towing lug will be the object of special discussion regarding its structural strength performance. The towing Lug model used when towing is in the form of an asymmetrical lobe. Two towing brackets are placed on the left and right sides of the bow barge. This towing lug sometimes damaged during towing, so it is necessary to simulate the strength of the towing lug using the finite element method (FEM). A 300 feet Barge is simulated with a total weight (W) of 1200 Tons. The towing lug design structure is made with 3 kinds of models with a varying number of layers and plate thickness. The towing lug design sample used in the existing shipyard is called model 1. While the other modifications to the 2 towing lug structures are called model 2 and model 3. Towing brackets are simulated using a computer with the help of Ansys software. The towing bracket's tensile angle is also varied to obtain a more attractive strength value. The variations of the pull angles used in this simulation are 80°, 83°, 85°, 87° and 90°. From the simulation results, it is obtained that the deformation values in each model show an insignificant level of change. In general, the simulation results also show stress values for each variation that tend to be safe and can be applied when the barge is towed to the dry dock. All equivalent stress values in each condition are still below the material yield stress. However, among the various simulations there are 2 types of conditions that experience stress values that exceed the class allowable stress","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129613525","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

The Prediction of Hydrodynamic Performance of Pinisi Ship Pinisi船水动力性能预测

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-03-04 DOI: 10.14710/kapal.v20i2.49749

M. A. Asis, A. D. E. Anggriani, Fadhil Rahmat Ramadhan

{"title":"The Prediction of Hydrodynamic Performance of Pinisi Ship","authors":"M. A. Asis, A. D. E. Anggriani, Fadhil Rahmat Ramadhan","doi":"10.14710/kapal.v20i2.49749","DOIUrl":"https://doi.org/10.14710/kapal.v20i2.49749","url":null,"abstract":"Pinisi ships are famous for their toughness across the ocean. The uniqueness of Pinisi is shipbuilding methods that are different without design engineering. The conditions present pinisi for tourist ships, problems have arisen recently, namely the number of Pinisi ship accidents. The main cause is bad water and technical factors. To improve safety and comfort, the aspect that needs to be studied hydrodynamic characteristics. The subject ship uses three samples of Pinisi ships produced by the Tanah Beru traditional shipyard. The hydrodynamic performance to be analyzed is hydrostatics, stability, resistance and ship motion, with several methods according to the respective standard to be analyzed. The shape of the pinisi hull is a rounded hull small coefficient block, and the largest change in hydrostatic parameters occurs at a draft of 0 meters to 0.25 meters. The resistance at a speed of 0-7 knots is relatively the same at every speed increase, but at speeds > 7 knots there is a change. RAO analysis for roll motion at a wave frequency of 1.5 – 1.75 rad/s for heading 90 degrees and for 45 degrees 3.65-3.80 rad/s. Heave motion occurs at a frequency of 4.25 rad/s – 4.4 rad/s with a wave direction of 0 degrees and a heading of 90 degrees smaller than the direction of the wave of 0 degrees. Evaluation of the stability arm, for variation KG critical, failed in 5/4H dan 1H in with B/T 3.43 to B/ T 5.00, while for the initial metacentric height parameter, all conditions still passed the criteria. ","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122164711","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

Maturity of digital transformation in the shipping industry: Case study among enterprises in Gulf Cooperation Council countries 航运业数字化转型的成熟度:以海湾合作委员会国家企业为例

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-26 DOI: 10.14710/kapal.v20i1.51246

Tif Said Suhail Al Mazroui, Maathir Mohammed Saud Al Alawi, Khafiya Sultan Hamood Al Wahaibi, Bashayar Badar Saif Al Amri, M. M. Thottoli, M. M. Thottoli

引用次数: 0

Comparative Study of Welding Material Elasticity with the SMAW Process for 2G Positions Between Before and After Using Welding Machines with Augmented Reality Technology 基于增强现实技术的焊接机在2G位置前后焊接材料弹性与SMAW工艺的对比研究

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-24 DOI: 10.14710/kapal.v20i1.49248

Arief Syarifuddin, Erdina Arianti, Kusnindar Priohutomo, Rosi Dwi Yulfani, B. Adietya, A. M. Ilmah, Taufan Prasetyo

{"title":"Comparative Study of Welding Material Elasticity with the SMAW Process for 2G Positions Between Before and After Using Welding Machines with Augmented Reality Technology","authors":"Arief Syarifuddin, Erdina Arianti, Kusnindar Priohutomo, Rosi Dwi Yulfani, B. Adietya, A. M. Ilmah, Taufan Prasetyo","doi":"10.14710/kapal.v20i1.49248","DOIUrl":"https://doi.org/10.14710/kapal.v20i1.49248","url":null,"abstract":"The high cost of certification and the low pass percentage in welding certification are common issues for beginner welders. The use of Augmented Reality (AR) technology is expected to solve these issues. The results of the penetrant, bending, and tensile tests showed that the welder who had used the AR welding machine produced better welding specimens than before they practiced using the AR welding machine. The penetrant test after beginner welder practiced using the AR welding machine produces rounded defects with a defect size of 1,44 mm (accepted by ASME Section V), whereas before they practiced using the AR welding machine it produces defects that cannot be accepted by the criteria. The maximum open discontinuity length in the bending test on the welded specimen after welder practiced using the AR welding machine is 2,90 mm (accepted by ASME Section IX), whereas the bending test before welder practiced using the AR welding machine is not accepted by the citeria. The tensile test results after welder practiced using the AR welding machine were 410,00 and 455,66 N/mm2 for the maximum tensile stress. This value exceeds the minimum tensile strength of SA-36 carbon steel, which is 400 N/mm2. When compared to the specimen before the welder practiced using the AR welding machine, the modulus of elasticity produced after the welder practiced using the AR welding machine is also smaller, indicating that the material has better elasticity. Based on the results of the tests, it can be seen that the AR welding machine can be used for the implementation of competency certification because the quality of the weld results is better, there are fewer risks (sparks, eye irritation, and burns), and the use of welding consumables is reduced","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"23 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123387292","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

Study of Purse Seine Fishing Ship Trimaran Seakeeping with Axe-Bow and Without Axe-Bow Model Using Computational Fluids Dynamics 用计算流体动力学方法研究围网渔船轴艏和无轴艏模型的三体耐浪性

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-24 DOI: 10.14710/kapal.v20i1.47092

Fella Gaspersz, A. Tupamahu, R. Luhulima, S. Tubalawony

引用次数: 0

Analysis of Material Supplier Selection in Laminated Bamboo Shipyards Using the Analytical Hierarchy Process Method 基于层次分析法的叠层竹船坞材料供应商选择分析

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-14 DOI: 10.14710/kapal.v20i1.49449

Abdul Rachman Safarudin, H. Supomo, W. Supomo

{"title":"Analysis of Material Supplier Selection in Laminated Bamboo Shipyards Using the Analytical Hierarchy Process Method","authors":"Abdul Rachman Safarudin, H. Supomo, W. Supomo","doi":"10.14710/kapal.v20i1.49449","DOIUrl":"https://doi.org/10.14710/kapal.v20i1.49449","url":null,"abstract":"The material supply chain is an essential part of the shipbuilding industry. For this reason, it is necessary to select suppliers who can support the material needs of ship production. Qualitative and quantitative factors are multi-criteria problems in supplier selection. The Analytical Hierarchy Process (AHP) method effectively determines an integrative approach to supplier selection. This research is applied to a laminated bamboo shipyard to evaluate several companies that can be used as material suppliers. The analysis was carried out using expert choice software by calculating the weight of each criterion and sub-criteria. The analysis results obtained the priority of the primary material supplier with the Kediri area (S1) as the supplier of bamboo material for ship construction with a global weighting value of 0.363. PT. An (S5) located in the Surabaya area is the next top priority as a supplier of adhesive and finishing 1st material components with global weighting values of 0.434 and 0.427, respectively. PT. E (S9) is located in the Semarang area as a priority supplier of finishing 2nd material components with a global weighting value of 0.490. UD. G (S11) is located in the Surabaya area as a priority supplier of ship mold components with a global weighting value of 0.456. In addition, UD. J (S14), located in the Surabaya area, is a priority supplier of material components for clamps, sanding, and cutting blades with a global weighting value of 0.496 and 0.351.","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129241314","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

Passengers and Crew's Evacuation from Passenger Ships Under Fire: An Agent-Based Model Simulation Study 客船遇火疏散:基于agent的模型仿真研究

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-08 DOI: 10.14710/kapal.v20i1.50714

A. Firdhaus, I. P. Mulyatno, M. L. Hakim, Zen Zen

{"title":"Passengers and Crew's Evacuation from Passenger Ships Under Fire: An Agent-Based Model Simulation Study","authors":"A. Firdhaus, I. P. Mulyatno, M. L. Hakim, Zen Zen","doi":"10.14710/kapal.v20i1.50714","DOIUrl":"https://doi.org/10.14710/kapal.v20i1.50714","url":null,"abstract":"The characteristics of the passengers have a significant impact on how the evacuation procedures are carried out. During an evacuation, the amount of time it takes depends on how quickly passengers move. There is a correlation between age and travel speed, but not always. As a result of this problem, a significant number of passengers were unable to make it to the assembly point in time for the evacuation, which may have resulted in fatalities. An evacuation simulation will be carried out aboard passenger ships in the event of a fire. This research will employ agent-based modeling to perform the simulation, and it will include modifications for day and night, as well as for the number of emergency stairs used. The findings of this study are the simulation times for the evacuation of passengers and crew for each scenario, with the shortest time for evacuation occurring during the daytime with operational emergency stairs, clocking in at 36.51 minutes, and the longest time for evacuation occurring during the night with damaged emergency stairs, clocking in at 47.43 minutes. Both times are given in minutes. According to the findings, the evacuation circumstances satisfied the standards set by the IMO, which demanded that the entire amount of time spent evacuating be less than or equivalent to sixty minutes","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"38 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114148740","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

Development of Hybrid CNG/Diesel Dual-Fuel Engine in High Load Condition for Marine Debris Vessel 海洋垃圾船高负荷工况下CNG/柴油混合动力发动机的研制

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-06 DOI: 10.14710/kapal.v20i1.51069

F. M. Felayati, E. Sugianto, N. Octaviani

{"title":"Development of Hybrid CNG/Diesel Dual-Fuel Engine in High Load Condition for Marine Debris Vessel","authors":"F. M. Felayati, E. Sugianto, N. Octaviani","doi":"10.14710/kapal.v20i1.51069","DOIUrl":"https://doi.org/10.14710/kapal.v20i1.51069","url":null,"abstract":"Greenhouse gas (GHG) emissions are the most influential issue in the transportation sector in recent years due to their impact on the environment. Thus, the design of transportation power plants is necessary to ensure the lowest GHG emissions. However, the development of a small vessel power plant is discussed in this study. The small vessel is a marine debris working vessel that has the purpose of collecting marine debris on the water surface with a conveyor. This vessel is designed with a dual-fuel engine fueled by natural gas from CNG and diesel fuel in high load conditions. Furthermore, the power system is designed with a systematical assessment condition based on the operational condition. Moreover, an experiment was conducted to study the performance and emissions of the engine. The hybrid system is designed with several operational conditions, such as sailing, collecting, and maneuvering. Most of the operations can be used in the hybrid dual-fuel system with nearly similar engine torque to diesel mode. The dual-fuel hybrid system has a significantly low engine fuel consumption with low CO2 emissions. However, relatively high NO2 and CO emissions are still considerable.","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115739599","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

Reliability-Based Analysis of Main Propulsion Fuel Oil System Maintenance for Tugboats with Qualitative and Quantitative Methods 拖船主推进燃油系统维修可靠性定性与定量分析

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Pub Date : 2023-02-06 DOI: 10.14710/kapal.v20i1.49335

Imam Pujo Pujo Mulyatno, Keyza Taqi Wafi, S. Jokosisworo, T. Tuswan

{"title":"Reliability-Based Analysis of Main Propulsion Fuel Oil System Maintenance for Tugboats with Qualitative and Quantitative Methods","authors":"Imam Pujo Pujo Mulyatno, Keyza Taqi Wafi, S. Jokosisworo, T. Tuswan","doi":"10.14710/kapal.v20i1.49335","DOIUrl":"https://doi.org/10.14710/kapal.v20i1.49335","url":null,"abstract":"This study aims to analyze the maintenance of the main propulsion fuel oil system for tugboats using both qualitative and quantitative methods. The focus is on evaluating the reliability of the system and identifying potential areas for improvement. The research employs a combination of expert interviews, industry standards, and statistical analysis to provide a comprehensive overview of the maintenance practices in place. The goal is to enhance the overall performance and longevity of the main propulsion fuel oil system in tugboats. The study uses data on the operational time, failure time and frequency, the number of vessels served, and fuel system diagrams to analyze the system's reliability. Qualitative methods such as Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA) were used, as well as quantitative methods such as Overall Equipment Effectiveness (OEE), Markovian Decision Process (MDP), and reliability methods. The study found that the FO Purifier component was the critical component with a Risk Priority Number (RPN) of 294. The average value of OEE was 47%, lower than the standard of 85%. The MDP analysis showed a probability of 0.08 for mild damage and 0.46 for moderate to severe damage under steady-state conditions. The FO Purifier component had the lowest Mean Time to Failure (MTTF) value of 1658.50 hours. The study provides a graph of the reliability function against time, and recommends maintenance actions based on the MTTF and MDP.","PeriodicalId":396367,"journal":{"name":"Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129966037","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