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Analysis of Fatigue Life of Tugboat Towing Hook Construction Using Finite Element Method 拖船拖钩结构疲劳寿命有限元分析
Kapal Pub Date : 2020-07-27 DOI: 10.14710/kapal.v17i2.29587
L. Adnyani, M. Arsyad, S. Nurcholik
{"title":"Analysis of Fatigue Life of Tugboat Towing Hook Construction Using Finite Element Method","authors":"L. Adnyani, M. Arsyad, S. Nurcholik","doi":"10.14710/kapal.v17i2.29587","DOIUrl":"https://doi.org/10.14710/kapal.v17i2.29587","url":null,"abstract":"The towing hook on the tugboat has a function to pull the barge. Because of this ability, a good towing hook construction is needed to work optimally. Indications for the good construction is the value of fatigue life, which is more than the value of design life of 20 years. A towing hook detail on tugboat from PT. Asia Aditama Shipyard – Balikpapan was selected as an example. This study aims to obtain the value of fatigue life based on the total resistance calculated by BHP data in full, 75%, and 50% of the total displacement volume and estimate the maximum size of a barge, based on maximal towing pull capacity. The benefits of this research are providing information about the fatigue life of a towing hook, analyzing several possible load cases, and giving the recommendation of the maximum principal dimensions of the barge that the towing hook can be pulled. The method used in this study is the finite element method using ANSYS, the fatigue life calculation approach is the Palmgren–Miner cumulative damage method and refers to the DNVGL rule. The results of the calculation of fatigue life in the maximum towing pull condition are 22 years, 22 years, and 23 years at 100%, 75%, and 50%, respectively. The main size of barges that can be towed by Tugboats under maximum towing pull conditions are LOA = 147m, LWL = 144,529m, B = 35m, H = 13m, T = 11m.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"86-94"},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i2.29587","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45059332","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
Strategy for Improving the Competitiveness of Shipyards in the Eastern Part of Indonesia 提高印尼东部造船厂竞争力的战略
Kapal Pub Date : 2020-06-30 DOI: 10.14710/kapal.v17i2.29448
S. Baso, M. Musrina, A. D. E. Anggriani
{"title":"Strategy for Improving the Competitiveness of Shipyards in the Eastern Part of Indonesia","authors":"S. Baso, M. Musrina, A. D. E. Anggriani","doi":"10.14710/kapal.v17i2.29448","DOIUrl":"https://doi.org/10.14710/kapal.v17i2.29448","url":null,"abstract":"In recent years, the number of shipyards in Indonesia has increased significantly to anticipate the increasing demand and the government policy regarding the Cabotage Principles and Masterplan for Acceleration and Expansion of Indonesia’s Economic Development (MAEIED), and three Archipelagic Sea-Lanes (ASL’s) in Indonesia. However, shipbuilding and ship repair works have been centered in the western part of Indonesia. Therefore, this study aims to develop a potential strategy of shipyards in the eastern part of Indonesia to compete in the current market situation. The Analytical Hierarchy Process (AHP) method was used to model the strategy hierarchy and analyze the weight of sub-criteria as the internal and external factors of the shipyard competitiveness. Then, the Blue Ocean Strategy method was used to analyze the competitiveness strategy. To improve competitiveness, the shipbuilding industries in the eastern part of Indonesia have to focus intensively on reforming and upgrading several internal environment factors such as coordination and response, business network, high skill manpower, and complex ship types building ability. Besides, the shipyards also have to focus on external environmental factors, particularly on five factors that have a high influence on improving competitiveness, namely shipping company partners, networks and partnership with suppliers, government policies, human resource development, and cluster formation of shipyards.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"74-85"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42052485","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
Performance Improvement of Hopper Cooling System on Traditional Fishing Boats Due to Excessive Cooling 传统渔船料斗冷却系统冷却过度对其性能的改善
Kapal Pub Date : 2020-06-30 DOI: 10.14710/kapal.v17i2.29496
E. S. Koenhardono
{"title":"Performance Improvement of Hopper Cooling System on Traditional Fishing Boats Due to Excessive Cooling","authors":"E. S. Koenhardono","doi":"10.14710/kapal.v17i2.29496","DOIUrl":"https://doi.org/10.14710/kapal.v17i2.29496","url":null,"abstract":"The engine cooling system that drives traditional fishing boats uses a hopper cooler type system that experiences excessive cooling. Ideally, the temperature of the cooling water in the hopper should be approximately 70-80°C. The fact, it is only 42°C, thus reducing the effective power generated by the engine. This excessive cooling may cause an increase in fuel consumption and emissions. One method to reduce excessive cooling is to increase the temperature of the cooling media in the hopper.  The author has conducted a simple experiment on a traditional fishing boat in Kenjeran, Surabaya, by installing a valve to control the flow of seawater entering the hopper. However, the use of seawater as a cooling medium has a maximum operating temperature limitation, so there is no precipitation of salt and lime, which is 50 o C. At this temperature, the benefits are not large, only an increase in speed of 4.4% and a fuel reduction of 4.3%. Therefore, the existing seawater cooling system must be modified to an indirect seawater cooling system to get optimum performance improvement. The re-modification allows the temperature of the freshwater in the hopper to be maintained at 80°C, so that the speed of the fishing boat may increase by 14%, with a fuel savings of 12.3%.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"58-64"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45999331","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
Wind Tunnel Investigation into the Resistance Analysis of Slender Body Catamaran 细长体双体船阻力分析的风洞研究
Kapal Pub Date : 2020-06-30 DOI: 10.14710/kapal.v17i2.29867
I. Utama, S. Sutiyo, Bagiyo Suwasono
{"title":"Wind Tunnel Investigation into the Resistance Analysis of Slender Body Catamaran","authors":"I. Utama, S. Sutiyo, Bagiyo Suwasono","doi":"10.14710/kapal.v17i2.29867","DOIUrl":"https://doi.org/10.14710/kapal.v17i2.29867","url":null,"abstract":"The Wind tunnel investigation of a slender body catamaran was conducted in order to determine its resistance characteristics, namely the effect of pressure and flow velocity changes for varied hull separation. The catamaran was tested in a wind tunnel belongs to Department of Mechanical Engineering, ITS, with hull separations of  S/L = 0.2 to 0.4 and variation in Reynolds numbers up to 4.46 x 10 5 . Pressure around the hull was measured using pressure tappings and the flow velocity behind the hull was also measured using a Pitot-static tube. The experimental study shows that the pressure coefficient decreases when the hull separation declines and conversely, the flow velocity increases. The tests demonstrated a viscous interaction between the hulls, and form factors for the monohull and catamaran are derived. The demihull exhibited a form factor (1+ k ) of 1.265 and in the catamaran mode, the measured form factor (1+ β k ) was between 1.416 and 1.403. The results are in agreement with other published data.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"65-73"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i2.29867","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46063560","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
Estimation of Effective Wave Slope Coefficient of Ships with Large Breadth and Draught Ratio 大宽度大吃水比船舶有效波斜率系数的估算
Kapal Pub Date : 2020-02-29 DOI: 10.14710/kapal.v17i1.28399
D. Paroka, A. Muhammad, S. Rahman
{"title":"Estimation of Effective Wave Slope Coefficient of Ships with Large Breadth and Draught Ratio","authors":"D. Paroka, A. Muhammad, S. Rahman","doi":"10.14710/kapal.v17i1.28399","DOIUrl":"https://doi.org/10.14710/kapal.v17i1.28399","url":null,"abstract":"One of parameters to estimate heel angle of a ship in beam seas is effective wave slope coefficient. In the weather criterion of IMO, the effective wave slope coefficient is determined as function of ratio between distance of center of gravity from the sea surface and the ship draught. The others methods could be used to estimate the effective wave slope coefficient are simplified strip theory and model experiment. A ship with shallow draught and large vertical center of gravity can have an effective wave slope coefficient larger than 1.0 if the coefficient is calculated by using the formulae of weather criterion. Therefore, an alternative method to estimate the coefficient is necessary when it is applied to ships with geometry characteristics different with those used to develop the formulae. This research conducts to estimate the effective wave slope coefficient using three different methods, namely the formulae of weather criterion, the simplified strip theory and model experiment. Results of the three methods may provide enough evidence about suitable method to estimate the effective wave slope coefficient of ships with breadth and draught ratio larger than 3.5 like the Indonesian ro-ro ferries. Results and discussion show that the effective wave slope coefficient obtained by using the formulae of weather criterion is larger compared to that obtained by using the simplified strip theory and the model experiment. Here, the result of simplified strip theory for wave frequency the same as the roll natural frequency of subject ship is similar with the result of model experiment. This results show that the simplified strip theory can be used as an alternative method to determine the effective wave slope of a ship with breadth and draught ratio larger than 3.5 if the result of model experiment does not available.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"40-49"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i1.28399","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48866380","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: 2
Front-Matter V. 17, No. 1 Front-Matter V. 17, No. 1
Kapal Pub Date : 2020-02-29 DOI: 10.14710/kapal.v17i1.28980
Muhammad Iqbal
{"title":"Front-Matter V. 17, No. 1","authors":"Muhammad Iqbal","doi":"10.14710/kapal.v17i1.28980","DOIUrl":"https://doi.org/10.14710/kapal.v17i1.28980","url":null,"abstract":"","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i1.28980","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42673760","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
Cover V. 17, No. 1 封面V. 17, 1号
Kapal Pub Date : 2020-02-29 DOI: 10.14710/kapal.v17i1.28979
Muhammad Iqbal
{"title":"Cover V. 17, No. 1","authors":"Muhammad Iqbal","doi":"10.14710/kapal.v17i1.28979","DOIUrl":"https://doi.org/10.14710/kapal.v17i1.28979","url":null,"abstract":"","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i1.28979","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47862651","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
Hybrid Propulsion System (PV / Gasoline) For Small Fishing Vessels 小型渔船混合动力推进系统（PV/汽油）
Kapal Pub Date : 2020-02-29 DOI: 10.14710/kapal.v17i1.25613
A. Sultoni, M. Ali, Zaenal Panutup Aji
{"title":"Hybrid Propulsion System (PV / Gasoline) For Small Fishing Vessels","authors":"A. Sultoni, M. Ali, Zaenal Panutup Aji","doi":"10.14710/kapal.v17i1.25613","DOIUrl":"https://doi.org/10.14710/kapal.v17i1.25613","url":null,"abstract":"The mechanism of hybrid (PV+gasoline) for fishing vessel propulsion was aimed to reduce fuel consumption.  The background of this research is lots of vessels not going for fishing because of a lack of fuel. With the hybrid mechanism, the fishing vessels could less fuel consumption without decreases its performance (torsion, power durability, and velocity) when cruising. In this paper, a parallel hybrid (PV/gasoline) is proposed. The gasoline generator will deliver power to DC motor if PV energy that stored to the battery not enough as the requirement of propeller propulsion. Hybrid design for a 3-ton overall weight of fishing vessel was designed with eight-unit solar panels @200 WP arranged as four string-2 series. Li-Ion battery pack with 4.5 KWH of capacity was used as energy storage. The simulation shows that the hybrid scheme can preserve the vessel speed at 16 Km per hour with time duration in 12 hours 46 minutes and needs 4 hours 10 minutes for full battery charging by a gasoline generator.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":" ","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i1.25613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49643785","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: 2
Back-Matter V. 17, No. 1 背景材料V.17，编号1
Kapal Pub Date : 2020-02-29 DOI: 10.14710/kapal.v17i1.28986
Muhammad Iqbal
{"title":"Back-Matter V. 17, No. 1","authors":"Muhammad Iqbal","doi":"10.14710/kapal.v17i1.28986","DOIUrl":"https://doi.org/10.14710/kapal.v17i1.28986","url":null,"abstract":"","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i1.28986","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44291171","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
Evaluation of Boat Lifting System Using A Multiple-Drum Winch 多卷筒绞车起船系统的评估
Kapal Pub Date : 2020-02-29 DOI: 10.14710/kapal.v17i1.26425
I. Asmara, H. Yudo
{"title":"Evaluation of Boat Lifting System Using A Multiple-Drum Winch","authors":"I. Asmara, H. Yudo","doi":"10.14710/kapal.v17i1.26425","DOIUrl":"https://doi.org/10.14710/kapal.v17i1.26425","url":null,"abstract":"Material handling equipment is designed or selected based on two factors, the aspects of technical and economic. Technical aspects of a boatlift are designated by technical specifications that can meet with the need to lift and move a boat from land to waterway and vice versa. Boatlift is a type of Rubber Tyred Gantry crane specifically designed for moving of small craft, small and medium vessels with a capacity of 10 tons to 600 tons. Boatlift with a capacity of 5 tons is very rarely to find and very different from other types of cranes such as overhead cranes that are easy to find. Boatlift with a capacity of 5 tons can be found at the Shipbuilding Institute of Polytechnic Surabaya, but it has a weakness. The boats experience an un-synchronize movement during the lifting process. This article provides the design of a boatlift pulley system with a capacity of 5 tons using a multiple-drum winch and is capable of lifting the boat at an even keel condition. The evaluation was carried out on the existing system to find the cause of the problem. The correction on the pulley system of the boatlift has been recommended without the replacement of wire rope, brakes, motor, and the multiple-drum of the winch. The weaknesses of boat lifting could be overcome by using a pulley system 8/2/2/1-DeBe + spreader.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"7-14"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14710/kapal.v17i1.26425","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42377393","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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