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Numerical Investigation Against Laboratory Experiment: An Overview of Damage and Wind Loads on Structural Design

Procedia Structural Integrity 2020年 27卷 6-13页

作者： Aldias Bahatmaka Dong-Joon Kim Aditya Rio Prabowo Daewoo Shipbuilding and Marine Engineering (DSME).Co.Ltd Okpo 53305 South Korea Interdisciplinary Program of Marine Design Convergence Pukyong National University Busan 48513 South Korea Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan 48513 South Korea Department of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia

The numerical approach is being used against experimental and solves engineering problems. In the engineering design, the structural and load analysis are a part of an important thing to show the effect of geometrical or the structure design. The main purpose is to review the influence of deckhouse height on the flow around the funnel and aft ship structure. In this review study, the fluid-structure and 3D steady RANS CFD are used to validate the result of simulations. Several aspects of the numerical approach, such as turbulence modeling, boundary conditions, inlet velocity, and pressure outlet to simulate wind load in CFD, ground surface roughness, and quantification of wind loads by computational fluid-structure and computational fluid dynamics (CFD) are summarized. A benchmarking study of the numerical approach against the experiment is emphasized. A comparative study among the numerical prediction on the wind tunnel demonstrated good agreement and satisfaction. Moreover, by numerical approach could handle the accurate results and show how the response to the ship structure that makes the dynamic interaction during wind loads events.

关键词： Fluid Structure Wind Loads Numerical Approach CFD Experimental

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Electrical system design of solar powered electrical recreational boat for Indonesian waters 3

Electrical system design of solar powered electrical recreat...

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3rd International Tropical Renewable Energy Conference on Sustainable Development of Tropical Renewable Energy (i-TREC)

作者： Sunaryo, Sunaryo Ramadhani, Adri Wirawan Univ Indonesia Dept Mech Engn Naval Architecture & Marine Engn Study Program Depok 16424 Indonesia

Indonesia has more than 17,000 islands and has plenty of beautiful beaches and underwater spots which have great potential for maritime tourism. Tourism was ranked 3rd on Indonesia's foreign income and plays an important role for the country's ecomony. Despite having potential advantages, the government has not yet maximized its efforts to develop the attractiveness of its maritime tourism. Beside the beautiful spots Indonesia is also blessed with all year long sun shine, which could be tapped as renewable and green energy as substitution to fossil fuel. Refer to these great advantages of natural resources the research was aimed to support the government's program in developing its maritime tourism and to promote the use of green and renewable energy by designing a solar-powered tourism recreational boat which has 12 meters of length. The paper is focused on the design of solar energy and its electrical system, which includes conversion of solar energy to electrical energy and store it in the battery, the required electrical power is also predicted based on the appliances and equipment installed in the boat, the optimum attachment of solar panels on the boat structure is also calculated. All the methods and information we use are obtained from literature study, discussion with experts, and surveys to Jagur as solar-powered electric boat from Universitas Indonesia.

关键词： Solar energy

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study of Utilization Plastic Waste as Basic Material for Boat Manufacturing Using Eco-green Design Concept

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IOP Conference Series: Materials Science and engineering 2021年第1期1125卷

作者： S Noverdo N Iswadi R Reda S Bambang P. Muayyad Studi Program Naval Architecture Faculty of Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia Study Program Industrial Engineering Faculty of Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia Naval Architecture & Ship Builder-PT Venta Technology Industri Jakarta Indonesia

The plastic waste problem has become a global problem and the effect on the environment is horrible. Almost all countries make an effort to reduce their daily utilization. Environmental organizations and researchers are also performing research to find ways to recycle plastic waste. In this paper introduces the 'Eco-green Design Concept' to utilize plastic waste (type 2) as fishing boat material. This concept will recycle 3 tonnes of plastic waste into the material of a fishing boat. In addition, the implementation element of eco-green design concept (design quality (D), Environmental Friendly (E), Eco-green Material (G)) into the design of fishing vessels has been successful. The concept does not only utilize type 2 plastic waste into the hull of the ship, but the design of the ship is made to have small resistance, good stability and has a large cargo area. And also has a machine that is environmentally friendly and does not cause pollution.

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Hull Design of Solar Powered Recreational Electric Boat for Indonesian Waters 3

Hull Design of Solar Powered Recreational Electric Boat for ...

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3rd International Tropical Renewable Energy Conference on Sustainable Development of Tropical Renewable Energy (i-TREC)

作者： Sunaryo, Sunaryo Yusro, Fahmi Univ Indonesia Mech Engn Dept Naval Architecture & Marine Engn Study Program Depok 16424 Indonesia

Indonesia with its more than 17,000 islands and its geographical location as tropical country is blessed with many marine tourism destinations such as beautiful beaches and coral reefs, coastal community culture etc., in fact tourism is ranked as 3rd highest foreign income. On the other hand Indonesian government is also committed to promote the use of environmentally friendly new and renewable energy as an alternative to the fossil fuel which highly contribute to the air pollution. In conjunction with government's program in developing the marine tourism and in using green energy, the research is aimed to design solar powered recreational boat for tourism in Indonesia. The paper is focused on the design of the boat structure such as the hull type, the environmental friendly material for the boat hull, the arrangement of the boat that would suitable to be powered with solar energy etc. For this purpose references are obtained from literature study, experts' opinion, and previous experiments.

关键词： Fossil fuels

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Ultimate Strength Assessment of Steel-Welded Hemispheres under External Hydrostatic Pressure

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Journal of marine Science and Application 2020年第4期19卷 615-633页

作者： Sang-Rai Cho Teguh Muttaqie Seung Hyun Lee Jaewoo Paek Jung Min Sohn Ulsan Lab Inc.UlsanSouth Korea School of Naval Architecture and Ocean Engineering University of UlsanUlsanSouth Korea Department of Naval Architecture and Marine Systems Engineering Pukyong National UniversityBusanSouth Korea Agency for the Assessment and Application of Technology Center of Technology for Defense and Security Industries-BPPTJakartaIndonesia Hyundai Mipo Dockyard UlsanSouth Korea Hyundai Heavy Industries UlsanSouth Korea Interdisciplinary Program of Marine Convergence Design Pukyong National UniversityBusanSouth Korea

This paper focusses on steel-welded hemispherical shells subjected to external hydrostatic *** experimental and numerical investigations were performed to study their failure *** model was fabricated from mild steel and made through press forming and *** therefore considered the effect of initial shape imperfection,variation of thickness and residual stress obtained from the actual *** hemisphere models designed with R/t from 50 to 130 were tested until *** to the test,the actual geometric imperfection and shell thickness were carefully *** comparisons of available design codes(PD 5500,ABS,DNV-GL)in calculating the collapse pressure were also highlighted against the available published test data on steel-welded ***,the nonlinear FE simulations were also conducted to substantiate the ultimate load capacity and plastic deformation of the models that were *** dependence of the level of sphericity,varying thickness and residual welding stresses were also numerically considered in the benchmark *** structure behaviour from the experiments was used to verify the numerical *** this work,both collapse pressure and failure mode in the numerical model were consistent with the experimental model.

关键词： Steel-welded hemisphere Collapse pressure Experiment Nonlinear FEA Ultimate strength formulation

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Design and calculation of mechanical system for solar-powered electric boat 2

Design and calculation of mechanical system for solar-powere...

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2nd International Tropical Renewable Energy Conference (I-TREC)

作者： Sunaryo Nurachman, Dendi Imfianto, Pradhana S. Univ Indonesia Depok Dept Mech Engn Naval Architecture & Marine Engn Study Program Depok 16424 Indonesia

Indonesian government has a flagship program that is to promote the nation through the maritime sector and make Indonesia as Global Maritime Fulcrum. To achieve that, sea transportation is very important for the development of Indonesia. But sea transportation is also the highest contributor to the air pollution and global warming. In order to reduce the source of global warming Indonesian Government has a strategic plan to gradually replace the use of fossil energy with renewable energy. One of the renewable energy that can be used effectively in Indonesia is solar energy, because Indonesia located along the equator and has a high intensity of sunlight that means it has excellent solar energy availability. In attempt to contribute to the Government's energy strategic plan, the research is aimed to design a solar-powered electric boat with single pilot. The project is a further development of the solar boat created by the Universitas Indonesia team that participated in the International Solar-boat Challenge competition in the Netherlands. The paper is focused on the design and calculation of its mechanical system. The system is divided into propulsion system, steering system, and bilge pump system. The research is conducted based on literature study, discussion with experts, and surveys to the solar-powered electric boat had been designed previously for the race. Collected data are then used as input for the calculation and simulation of the vessel being designed. It is expected that the study could optimize the mechanical system of the solar-powered electric boat, and can be developed for recreational use in Indonesian waters.

关键词： Global warming

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Propulsion System Analysis For Solar-Powered Electric Water Recreational 3

Propulsion System Analysis For Solar-Powered Electric Water ...

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3rd International Tropical Renewable Energy Conference on Sustainable Development of Tropical Renewable Energy (i-TREC)

作者： Sunaryo Nurachman, Dendi Univ Indonesia Dept Mech Engn Naval Architecture & Marine Engn Study Program Temple Depok 16424 Indonesia

Indonesia is the world's largest archipelago with more than 17,000 islands, and also the best marine tourism destination, there are many beautiful beaches and underwater spots throughout the country. Due to this potential condition Indonesian government is planning to improve its maritime tourism sector. To realize this boats play very important role both for transport as well as for recreational purposes. On the other hand the government is also committed to reduce the global warming from the use of fossil fuel especially in industry and transportation through the Presidential Regulation no. 61/2011, with the strategy for replacing the fossil fuel with renewable energy. To support the government's program the research is aimed to design solar -powered electric recreation boat for tourism, with the consideration that there is almost non-stop sun shine available all year long in Indonesia. The boat has length of 12 meters. In this paper the focus is on the analysis of the propulsion system of the boat, which consists of the calculation the power needed to run the electric motor, the optimum propeller design, and the steering system.

关键词： Boats

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Seasonal variation of marine debris at Manado Bay (North Sulawesi, Indonesia)

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IOP Conference Series: Earth and Environmental Science 2021年第1期744卷

作者： M T Lasut L R Pane D V D Doda V A Kumurur V Warouw J M Mamuaja The study program of Aquatic Sciences Faculty of Fisheries and Marine Sciences Sam Ratulangi University Manado Indonesia The study program of public health Faculty of Public Health Sam Ratulangi University Manado Indonesia The study program of Architecture Faculty of Engineering Sam Ratulangi University Manado Indonesia The study program of Marine Sciences Faculty of Fisheries and Marine Sciences Sam Ratulangi University Manado Indonesia

marine debris has become a global concern due to its impact on marine ecosystems. These materials generally come from land and are deposited to marine environment through different agent of carrier. Many efforts are being made to monitor the dynamics of the debris including their presence and their variability in relation to seasons. The latter are assumed from the facts that the presence of the debris is mainly affected by the waves, speed, and direction of ocean currents in the area of interest. In this study, variation of debris in dry and wet season at Manado Bay was assessed by using a shoreline technique. Two locations are selected, Bailang and Malalayang beach. The samplings were conducted in August 2019 (represent dry season) and January 2020 (represent wet season). Several parameters are examined during the sampling; they are: amount of material, type of debris, composition, and spatial density of each type for macro-size (>2.5 cm) and meso-size (0.5–2.5 cm). The results showed that there was variation on composition and density, but the types of debris remain unchanged. Our present study concluded that variation in the season do not affect the variability of marine debris in Manado Bay.

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Economic Feasibility of a Small-Scale Wind Turbine in Coastal Area of South Sulawesi

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IOP Conference Series: Earth and Environmental Science 2021年第1期921卷

作者： F Mahmuddin N Puspitasari M U Pawara Marine Engineering Department Engineering Faculty Hasanuddin University Indonesia Naval Architecture Program Department of Science Food Technology and Maritime Kalimantan Institute of Technology Balikpapan Indonesia

To evaluate the exploitation potential of wind energy in the coastal area of South Sulawesi, Indonesia, an investigation on the economic feasibility of this project was performed. A 300-watt horizontal wind turbine was used as an example installed turbine. The wind speed range of 4-7 m/s which was the wind speed data in the coastal area of South Sulawesi was computed. The main economic analysis method employed was Capital Budgeting Analysis (CBA) method. In this method, 4 (four) indicators were used to evaluate the feasibility of the project which are payback period (PBP), net present value (NPV), internal rate of return (IRR), and benefit-cost ratio (BCR). A visual basic computer program based on the CBA method was also developed to make the computation more convenient. From the study, it was found that the wind speed range of 4-6 m/s resulted in a non-feasibility project while the highest wind speed (7 m/s) was found to be quite strong to make the project feasible.

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Simulation of lighting system in the accommodation deck of a 750GT ro-ro ferry

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AIP Conference Proceedings 2022年第1期2543卷

作者： Faisal Mahmuddin Surya Haryanto Muhammad Uswah Pawara Apriansyah 1Marine Engineering Department Engineering Faculty Hasanuddin University Gowa Indonesia 2Naval Architecture Program Department of Sains Food Technology and Maritime Kalimantan Institute of Technology Balikpapan Indonesia 3Civil Engineering Department Engineering Faculty Universitas Sulawesi Barat Majene Indonesia

In order to improve the convenience when using a ro-ro ferry, the lighting system used in the ship needs to be designed as conveniently as possible, especially in the accommodation deck. Therefore, the present study simulated and analyzed the lighting system in the accommodation spaces of a 750GT ro-ro ferry. The accommodation space was divided into 3 spaces which are front, middle, and rear spaces. A lighting analysis software named AGI32 was used to compute the lighting performance of each space. The number of lights installed in each space was determined using the room estimator function which is one of the features of the software. From the computation, it was found that the illuminance obtained from the simulation had a lower average than the one defined in the initial design. Moreover, it was also found that the middle accommodation space had the highest illuminance as compared to the other accommodation spaces.

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