Kapal最新文献 - Book学术

Experimental Investigation of Bow Slamming on a Ship: The Effect of Weight and Impact Angle 船体船头撞击试验研究：重量和撞击角的影响

Kapal Pub Date : 2021-02-28 DOI: 10.14710/KAPAL.V18I1.35663

S. Baso, Andi Nadia Himaya, Faizal Arya Samman, A. D. E. Anggriani, R. Rosmani

{"title":"Experimental Investigation of Bow Slamming on a Ship: The Effect of Weight and Impact Angle","authors":"S. Baso, Andi Nadia Himaya, Faizal Arya Samman, A. D. E. Anggriani, R. Rosmani","doi":"10.14710/KAPAL.V18I1.35663","DOIUrl":"https://doi.org/10.14710/KAPAL.V18I1.35663","url":null,"abstract":"The impact pressure induced by slamming can imply physical damage on a ship. The high probability of the slamming impact is on the bow part in the actual sea state. In this present study, the slamming induced pressure on the bow flare of a ship have been investigated through the experiment. The experiment was schemed by the dropping test based on free-falling body in the wave tank, wherein the bow of the ship model was inclined in several impact angles 0° to 30° to the free-water surface. To measure slamming impact pressure acting on the bow flare, the piezoelectric sensors S1, S2, S3, S4 were attached to the bow section and installed on a computer. As the obtained results, the impact pressure on bow flare occurred in a short time duration caused by slamming. The discrepancy of the peak impact pressure between ship model weight of 2.42 kg and 7.29 kg for the impact angle 0° is 70.36% S1, 69.52% S2, 68.97% S3, and 68.34% S4. For the relative impact angle of 30°, the discrepancy is 67.02% S1, 65.73% S2, 58.51% S3, and 48.21% S4. The tendency of the peak pressure coefficient at the sequenced impact points S1, S2, S3, S4 is similar for all impact angles 0°, 10°, 20°, and 30°. The peak pressure coefficient due to the full load condition is highest in the nearest bottom part, and the peak pressure coefficients due to the lightship condition highest in the nearest bottom part caused by the small impact angle.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"18 1","pages":"51-57"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49531397","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

Study on Implementation of Activity-Based Costing (ABC) System on Determination of Indirect Costs in Ship Production 作业成本法在船舶间接成本核算中的应用研究

Kapal Pub Date : 2021-02-28 DOI: 10.14710/KAPAL.V18I1.33000

S. I. Wahidi, Vialdo Muhammad Virmansyah, T. W. Pribadi

{"title":"Study on Implementation of Activity-Based Costing (ABC) System on Determination of Indirect Costs in Ship Production","authors":"S. I. Wahidi, Vialdo Muhammad Virmansyah, T. W. Pribadi","doi":"10.14710/KAPAL.V18I1.33000","DOIUrl":"https://doi.org/10.14710/KAPAL.V18I1.33000","url":null,"abstract":"Currently, business development, especially in the maritime sector, has quite rapid progress in Indonesia. Recently, the shipbuilding industry's development is an effort to improve competitiveness with the global market. With the increasing development of the shipbuilding industry in Indonesia, cost accounting as a cost information system is challenged to develop the shipbuilding industry, requiring high product quality. This matter requires the company to decide on proper budget planning not to experience losses. Activity-Based Costing (ABC) System is a system to determine costs using activities to classify costs to produce indirect costs that are more systematic and relevant. Activity-based costing systems identify resources in each department's activities to provide information about a product's cost. It collects indirect costs and allocates them to various products in proportion to the product volume. Therefore, activity-based costing can estimate the product costs and individual activity costs used in the production well. The first step is classifying activities, associating various costs with various activities, determining homogeneous cost groups, and determining group rates. The second step of this stage is the determination of overhead prices selected from each cost group. This research compares indirect costs to the construction of 2x1800 HP tugboat ships according to traditional cost accounting methods with the Activity-Based Costing System method. The first method's result is 3,432,920,043 IDR and the second method is 2,231,760,472 IDR.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"18 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47524996","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: 5

Material Effectiveness Model for the Construction of Aluminum Hull 铝制船体结构材料效能模型

Kapal Pub Date : 2021-02-28 DOI: 10.14710/KAPAL.V18I1.29974

Bagiyo Suwasono, Mochammad Rizky Darmawan, I. Baroroh

{"title":"Material Effectiveness Model for the Construction of Aluminum Hull","authors":"Bagiyo Suwasono, Mochammad Rizky Darmawan, I. Baroroh","doi":"10.14710/KAPAL.V18I1.29974","DOIUrl":"https://doi.org/10.14710/KAPAL.V18I1.29974","url":null,"abstract":"Construction of a hull generally requires several plates and profile material. Early indications for shipbuilding indicate that in manner, the linear function approach for installed material was 75% to 90%, and waste material was 10% to 25%. This study is conducting an assessment of the area of installed material and waste material on small vessels made of aluminum with variations in ship length and the method of approach trend lines both linear and nonlinear. Secondary data retrieval in the form of an aluminum cutting plan for plate material and profile from the AutoCAD application, which is then reprocessed through the FastCAM application to obtain results in the form of identification of installed material and waste material area. Based on variations in ship length and material area results, a scatter plot process was carried out through the Excel application to obtain results in the form of trend line functions with an R-squared determination coefficient of more than 0.9 and the results of the calculation of the intersection between the function of installed material and waste material, and the waste material function with the x-axis uses the balance method. The final result showed that the linear function gives an indication of the effectiveness of the material located in the range of 6 to 23 meters in length of the boat and polynomial function of order 2 in the range of 6 to 18 meters in length, while the waste material area in the two functions maximum 22%.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"18 1","pages":"18-27"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45590576","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

Transmission Coefficient Analysis of Notched Shape Floating Breakwater Using Volume of Fluid Method: A Numerical Study 用流体体积法分析缺口型浮式防波堤的传递系数

Kapal Pub Date : 2021-02-28 DOI: 10.14710/KAPAL.V18I1.34964

Asfarur Ridlwan, H. Armono, S. Rahmawati, T. Tuswan

{"title":"Transmission Coefficient Analysis of Notched Shape Floating Breakwater Using Volume of Fluid Method: A Numerical Study","authors":"Asfarur Ridlwan, H. Armono, S. Rahmawati, T. Tuswan","doi":"10.14710/KAPAL.V18I1.34964","DOIUrl":"https://doi.org/10.14710/KAPAL.V18I1.34964","url":null,"abstract":"As one of the coastal structures, breakwaters are built to protect the coastal area against waves. The current application of breakwaters is usually conventional breakwaters, such as the rubble mound type. Climate change, which causes tidal variations, sea level height, and unsuitable soil conditions that cause large structural loads, can be solved more economically by employing floating breakwater. In this study, numerical simulations will be conducted by exploring the optimum floating breakwater notched shapes from the Christensen experiment. The comparison of three proposed floating breakwater models, such as square notch (SQ), circular notch (CN), and triangular notch (VN), is compared with standard pontoon (RG) to optimize the transmission coefficient value is analyzed. Numerical simulations are conducted using Computational Fluid Dynamics (CFD) based on the VOF method with Flow 3D Software. Compared to the experimental study, the RG model's validation shows a good result with an error rate of 8.5%. The comparative results of the floating breakwater models are found that the smaller the transmission coefficient value, the more optimal the model. The SQ structure has the smallest transmission coefficient of 0.6248. It can be summarized that the SQ model is the most optimal floating breakwater structure.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"18 1","pages":"41-50"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48928340","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

Strength Analysis and Repair Strategy of Aged Steel Jetty Pile 老钢码头桩强度分析及修复策略

Kapal Pub Date : 2021-02-28 DOI: 10.14710/KAPAL.V18I1.34899

R. Riyanto, N. Syahroni, Y. Mulyadi

引用次数: 1

The Wave Heights Distribution of Random Wave Based on Ocean Basin 基于海洋盆地的随机波波高分布

Kapal Pub Date : 2020-10-31 DOI: 10.14710/kapal.v17i3.31021

Nurman Firdaus, Baharuddin Ali, M. Nasir, M. Muryadin

{"title":"The Wave Heights Distribution of Random Wave Based on Ocean Basin","authors":"Nurman Firdaus, Baharuddin Ali, M. Nasir, M. Muryadin","doi":"10.14710/kapal.v17i3.31021","DOIUrl":"https://doi.org/10.14710/kapal.v17i3.31021","url":null,"abstract":"The wave height parameter in ocean waves is one of the important information for a marine structure design. The present paper investigates the results of wave heights distribution from laboratory-generated for single sea state. Data of the random wave time series collected at the ocean basin are analyzed using the wave spectrum and compared with the theoretical spectrum in this study. The random wave data is varied with four sea states consisting of sea states 3, 4, 5 and 6 obtained from laboratory measurements. The parameter conditions of generated sea waves are represented by a value of significant wave height and wave peak period in the range of sea states. The individual wave heights data in each sea state are presented in the form of exceedance probability distribution and the predictions using a linear model. This study aims to estimate the wave heights distribution using the Rayleigh and Weibull distribution model. Furthermore, the accuracy of the wave heights distribution data's prediction results in each sea state has been compared and examined for both models. The applied linear models indicate similar and reasonable estimations on the observed data trends.","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"114-122"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42832851","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

Effect of the Addition of Hydrofoil on Lift Force and Resistance in 60 M High-Speed Vessel 加水翼对60m高速船升力和阻力的影响

Kapal Pub Date : 2020-10-31 DOI: 10.14710/kapal.v17i3.28772

Izzuddin Nadzir Ismail, P. Manik, M. Indiaryanto

引用次数: 3

Determination of PV Power and Battery Capacity Size for a Leisure Solar Powered Boat at Kalimas River, Surabaya, Indonesia 印度尼西亚泗水Kalimas河上休闲太阳能船的光伏功率和电池容量大小的测定

Kapal Pub Date : 2020-10-31 DOI: 10.14710/kapal.v17i3.31965

A. Nasirudin, H. Hasanudin, D. Utama, Lia Pundhi Tahwoto

引用次数: 2

Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process 电流对6061铝钨极气体保护焊力学性能和组织的影响

Kapal Pub Date : 2020-10-31 DOI: 10.14710/kapal.v17i3.30054

T. Tarmizi, K. Sianturi, I. Irfan

{"title":"Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process","authors":"T. Tarmizi, K. Sianturi, I. Irfan","doi":"10.14710/kapal.v17i3.30054","DOIUrl":"https://doi.org/10.14710/kapal.v17i3.30054","url":null,"abstract":"Aluminum 6061 is an aluminum alloy that is widely used in various industrial fields which cannot heat treatable. However, it can be joined using a welding process. Aluminum joining using the Gas Tungsten Arc Welding (GTAW) process has become the option to produce good quality joints. The purpose of this research is to get optimum welding parameters by knowing the mechanical properties and microstructure of the welding results. The GTAW process uses a 25-volt voltage, Argon protective gas flow rate of 15 liters per minute with filler rod ER 5356 with 2.4 mm diameter and electrodes tungsten 2.4 mm in diameter. This process also uses a single V butt joint and groove angle of 60 o with variations in the current of 100, 110 and 120 A. The results indicate that specimens with a variety of current of 110 A, give better results in the absence of defects, have a tensile strength of 152 MPa as well as get hardness value of 87.55 HV which is the highest, compared to the other two specimens. Whereas specimens with the current variation of 100 and 120 A have defects in the weld area. The optimum parameters of the 6061 aluminum GTAW process with a thickness of 6 mm using a current of 110 A, bring on better outcomes and mechanical properties, in comparison with the use of currents of 100 and 120 A","PeriodicalId":34627,"journal":{"name":"Kapal","volume":"17 1","pages":"107-113"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49510489","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

Vertical Motion Optimization of Series 60 Hull Forms Using Response Surface Methods 用响应面法优化60系列船体的垂直运动

Kapal Pub Date : 2020-10-31 DOI: 10.14710/kapal.v17i3.33212

B. Utomo, M. Iqbal

引用次数: 2