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The Indonesian Journal of Naval Architecture
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Arjuna Subject : -
Articles 7 Documents
 1 
The Assessment of CSR Regulations Implementation on the Midship Strength and Structural Weight of 77.500 DWT Bulk Carrier Zakki, Ahmad Fauzan
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

Since April 1st 2006, all of the ships that built must comply with the common structural rules. As the consequences of this condition the scantling of the ship will be increased. This paper will explain about the influence of the CSR rules implementation to the midship strength and structural weight of 77.500 DWT Bulk Carrier. The comparisons of two finite element models will be made to distinguish the effect of scantling modifications to the midship strength and the weight of the ship structures. The results show that the steel weight has been increased 4.74 % higher than the prior ship. The critical condition is the harbor-1 condition with the maximum plate stress induced by SWBM is 96.6 MPa; The Maximum Bar Stress is 84.7 MPa. The conclusion states that the CSR regulations standard not significantly different with the DNV standard for the Midship Strength performance. It could be actually explains that the increment of the plate thickness only for the corrosion allowance.
STUDY OF CORROSION PERFORMANCE OF ZINC COATED STEEL IN SEAWATER ENVIRONMENT M, Ferry; N.I., Mohd Sukarnoor
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

In this study, the corrosion protective mechanisms of zinc coating for mild steel in seawater were examined using weight  loss,  and  electrochemical impedance  spectroscopy  methods (EIS).  Coating is  a  technique to control the corrosion of a metal by providing an impervious metallic barrier by using sacrificial anode. The samples used in this study were fully zinc coated steel, zinc coated steel with scratch and mild steel as a control. Each sample undergoes the immersion process in seawater for 40 days. The results showed the corrosion rate of fully zinc coated steel decreases with immersion time from 0.03 mm/y to 0.01 mm/y and for zinc coated with scratch, from 0.034 mm/y to 0.012 mm/y. Impedance measurements studies revealed that fully zinc coated steel behave predominantly to be more practical anode in applying a great protection barrier for mild steel
MANEUVERING PERFORMANCE OF A FERRY AFFECTED BY RUDDER AREA AND SPEED Muhammad, Andi Haris; Djabbar, Muhammad Alham; Yuniarsih, Nidia
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

The aim of the study is to determine the effect of rudder area and speed on a ferry ship maneuvering performance, especially during the turning circle and zigzag maneuver.  MATLAB-simulink was used to simulate turning circle and zigzag maneuver. The simulation utilized model based on the concept of Mathematical Modelling Group (MMG) includes testing/separating components of the hull equations, propeller and rudder as well as the interaction among them (hull, propeller and rudder). The result of simulation indicated that rudder  dimension and ship speed  affect both turning circle and zigzag maneuver of the ferry reasonably.
ROLL MOTION CHARACTERISTICS OF SHIP WITH LARGE BREADTH AND DRAUGHT RATIO IN FOLLOWING WAVES Paroka, Daeng; Asri, Syamsul
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

Since the International Maritime Organization decided to revise its intact stability criteria from deterministic based criteria to be performance based one, some researches regarding the ship performance in waves have been conducted by several researches. One of the dangerous condition reccomended to be included in the criteria was the stability of ships in following waves especially for ship with small coefficient for vertical well-sidedness. Ships with large breadth and draught ratio tends to have large the coefficient for well-sidedness. However large roll angle may occur when the ships operate in large significant wave height. The forward speed also could have significant effect on the roll motion characteristics due to time spend of ship in a certain position relative to the wave. This paper discusses effect of restoring arm variation due to waves characteristics and ship speed on roll motion of ships with large breadth and draught ratio in following waves. The waves characteristics is modelled based on the Beaufort scale and the forward speed is estimated by changing the propeller revolution from 6 rps to 15 rps. The results of numerical simulation and discussions show that amplitude of roll motion significantly affected by variation of the waterline area of the ship in sugging and hogging condition. The large roll angle can be avoided by increasing the forward speed with considering the other dangerous condition such as pure loss of stability and broaching.
Study On The Possibility Of Establishing Shipbuilding Cluster In Lampung Province Sumatra Indonesia As Pilot Project In Conjunction With Government’s Program On The Acceleration And Expansion Of Indonesian Economic Development (MP3EI) Sunaryo, Sunaryo
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

As the result of the implementation of cabotage principle in 2005 by the Government of Indonesia the number of national fleet has increased dramatically around 5,000 units in the last five years due to import of used vessels from abroad, which most of them are relatively old and need renewal, maintenance and repair. This situation creates potential market for new building as well as repair yards in Indonesia. In response to this the research is aimed to identify the possibility of establishing a shipbuilding cluster in Lampung Province, Sumatra as pilot project for the Government’s program in developing the shipbuilding industries in Java and Sumatra Economic Corridors of the Acceleration and Expansion of Indonesian Economic and as complementary to the existing shipbuilding centers in Batam, Jakarta, East Kalimantan and Surabaya to cater the demand, and to make the most of industries around it. The study is started by gathering primary and secondary information regarding the location, market, resources and infra structure, and supporting industries, simulating the information, draw conclusions, and propose a conceptual design of the cluster.
COMPARATIVE STUDY OF HYBRID CATAMARAN VERSUS DIESEL MONOHULL BOAT AS FERRY FOR SHORT DISTANCE ROUTES. M, Ferry
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

The increasing of fossil’s fuel prices and environmental awareness urges engineers try to hybrid diesel with green energy such as solar energy. Through photovoltaic cells, solar energy is converted into electricity that could power the electric motors as the prime mover at a catamaran that has more slimmer and shallower cross-section area than single hull boat of an equivalent displacement has less draught, more deck area and more stable.. Electric motor maintains high efficiency over a wide range of loads and speeds has a small weight and need low maintenance and repair cost compared to diesel engines or outboard motors. At countries like Malaysia and Indonesia where solar energy is available during average six to seven hours a day is a quite good time range to charge the batteries until reach its full capacity, but when solar radiation is not available the battery charging is taken over by diesel generator. Such hybrid system is efficiently to be used for catamaran boat on rivers, between ports at coastal area and between closed islands due to its less the operational cost, maintenance cost and less carbon emission compare with fully diesel system, hence this is a more environmental friendly system.
TECHNO-ECONOMIC STUDY OF ALUMINIUM ALLOY AND STEEL AS MATERIALS FOR DECKHOUSES OF OFFSHORE SUPPORT VESSELS M, Ferry
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

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Abstract

Aluminium alloy is a relatively more expensive material than steel although its weight is one-third of the steel. Thus the use of steel as a structure adds additional weight by 60%; and when used as deckhouses would raise the GM and scarifying the stability of the offshore support vessel. This paper reviews the merit and demerit of Aluminium alloy and steel focusing on fabrication and assembly, and maintainability cost typical of a 60.0m offshore support vessel operating between Kemaman port and offshore oil rigs in the South China Sea. Mathematical equation was used to calculate the weight of the materials used to construct the deckhouses. Also, net present value and payback period calculations were performed to indicate the economic benefit between the two materials. The initial construction cost for Aluminium and Steel are USD 45506 and USD 6808 respectively involving 23.5 metric ton for Aluminium and 67.0 metric tons for steel. In term of investment, offshore support vessels using Aluminium have shorter payback period of 7.9 years and 8.4 years for steel inclusive of the costs of maintenance and operation. This exercise indicates Aluminium alloy is more economical than steel as construction material for deckhouse of offshore support vessel due to its light weight, lower maintenance and increase earning capacity (more cargo).

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