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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS Jurnal Pendidikan Teknik Mesin International Journal of Marine Engineering Innovation and Research Jurnal Pendidikan Syura: Journal of Law
Achmad Baidowi, Achmad
Institut Teknologi Sepuluh Nopember
Religion Humanities Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Analysis of the Motion Response on the Cylindrical Platform of the Deep Sea Achmad Baidowi; Irfan Syarif Arief; Ahmadi Munib
International Journal of Marine Engineering Innovation and Research Vol. 3 No. 4 (2019)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v3i4.6047

Abstract

The strategic point of potential tidal energy in Indonesia can be a solution to the energy crisis, and as the development of renewable energy. Several concepts of the floating marine current turbine (MCT) have been offered, one of them is the cylindrical platform. The object of the conducted study is 33 m cylindrical platform with twin horizontal axis MCT installed underneath the platform. The analysis begins with the platform properties which include Centre of gravity, gyration radius and inertial. The environmental loads are 1 m/s and 2 m/s current speed, 2.4 m wave height, and 22 knots wind. The properties will be used as input for motion analysis and mooring line tension. The results of the analysis with turret configuration of three lines and four lines show that the response amplitude operator (RAO) on the largest translational motion on surge motion as far as 4 m and rotational motion of 4.5 degrees. For the analysis of the mooring system the average maximum tension of the mooring chain reaches 2000 kN, with the maximum proof load at the value of 2245.82 kN which resulted to a safety factor of 1,73 and it still complies to API RP 2SK Standard.
Development of Cutter Head Design in Cutter Suction Dredger with Thickness and Pitch Variation Amiadji; Achmad Baidowi; Riyan Prayogo
International Journal of Marine Engineering Innovation and Research Vol. 3 No. 3 (2019)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v3i3.6058

Abstract

The need for dredgers for the shallow water in the sea with a very high level of siltation on the coast of Indonesia is a factor worth considering. For example, coastal areas in Ujung Pangkah sub-district, Gresik district, East Java province. The choice of the area is due to the many institutions and corporations that are back and forth utilizing these waterways. But the main obstacle to making a Cutter Suction Dredger (CSD) is almost all the equipment needed is imported, for example, the main equipment is the cutter head. Therefore looking at the needs, economics and technology factors, this paper will discuss the cutter head design. Available data is a request from the owner, 40KW power cutter head; 1000mm cutter diameter; 30rpm rotation. The force distribution given 5950 N is in accordance with the dredging condition which is to have a strong material tension to be estimated to work at a relatively Soft density of <100 Mpa and Medium around 100Mpa - 170Mpa. The expected results of this design are to obtain a proportional design before the production process and to function at a minimum according to specifications. The usefulness of this design really hopes to be followed up to the production stage and can be applied.
The Effect of Boss Cap Fins to B – Series Propeller Performance With CFD Method Amiadji; Achmad Baidowi; Achdri Fauzi Nugraha Oloan
International Journal of Marine Engineering Innovation and Research Vol. 2 No. 4 (2018)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v2i4.6085

Abstract

Propeller is similar to rotating fan blade with having primary function as propulsion system. In order to increase propeller performance, Engineer is developing Energy Saving Devices (ESD) to reduces operational cost, clean energy and for long term utilization. The global emmision from marine is 2.7 % in 2007. One of ESD is Propeller Boss Cap Fins (PBCF). The focus of this thesis is to design and developed PBCF B - series propeller. This thesis studies the performance of a propeller without and with PBCF such as efficiency, thrust, torsion and dynamic hub vortex phenomenon. To obtain the results this thesis uses Computational Fluid Dynamic (CFD). The PBCF simulations were based on its pitch angle. The simulation results shows that PBCF is achieved the highest efficiency which is 0.60 %, and increases thrust 3.21 %, and torsion increase 2.64 % compared to propeller without PBCF. It also shows that the PBCF is able to break the vortex flow and it will reduces the porosity to the rudder and decrese the corrosion potention to the rudder.
The Hull Strength of Marine Current Turbine Platform Achmad Baidowi; Irfan Syarif Arief; Lintang Candra
International Journal of Marine Engineering Innovation and Research Vol. 2 No. 3 (2018)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v2i3.6092

Abstract

Strength analysis of hull structure of marine renewable energy is crucial. The hull structure must be able to whitstand the harsh environmental load such as wave, wind and the weight of the payload and the structure itself. This paper analyzies the structural hull strength of marine current turbine platform. The platform is held by 4 mooring lines in 200 m water depth. The hull material is AISI1050 with yield stress 530MPa, the analysis consist of stress analysis which consider the dynamic motion of the platform due to wave, current, win and mooring line tension. The dynamic motion shows the maximum gravity acceleration is 1.3496G. The gravity acceleration creates additional loads due to weight multiplication of payload and structure. From the dynamic analysis using numerical software, the maximum mooring line tension due to dynamic analysis is 300.74 kN and this tension will creates stress in the moring line connection structure in the platform hull. The maximum stress of the is 126.045Pa, The mooring line tension is the highest loads compared to other factors such as weight. The safety factor of the structure based on the analysis is 4.2 which can be calculated by comparing the yield stress of the hull material and the maximum stress occurred due to dynamic load.
Fatigue Life Analysis Of Car Deck Construction on a Ferry Ro Ro Amam Baharullah; Achmad Baidowi; Edi Jadmiko
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6462

Abstract

Fatigue life analysis is often overlooked in ship development, leading to an uncertain understanding of a ship’s construction lifespan. This study focuses on the fatigue life of the car deck, which is affected by deformation on a ro-ro ferry. The research aims to determine the maximum stress, location, the cause of deformation, and the fatigue life of the car deck on a ro-ro passenger ship. The calculations assess the car deck’s lifespan and provide a reference for future design considerations. Finite element analysis (FEA) is used, with fatigue life calculated using the Sonderberg method. The research begins with calculating the ship’s weight and buoyancy distribution, then determining the ship’s longitudinal strength from the load distribution. The analysis reveals that the highest stress occurs under hogging wave conditions, exceeding the yield strength of 321 MPa. Specifically, at overload and hogging wave conditions, the highest stress of 486.1 MPa is found on the starboard side between longitudinal stiffeners 1 and 2 (900 mm from the centerline), between frames 56 and 57, with a fatigue life of 4.3 years.
Quantitative Analysis of Macro Foam Integration in Non Pressurized Manned Submersibles (NPMS): A Comprehensive Study of Buoyancy Management and Operational Performance Zulfakhri, Ahlan; Baidowi, Achmad; Sunarsih, Sunarsih
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 3 (2025): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i3.78858

Abstract

Non-pressurized manned submersibles continue to struggle with fundamental limitations in buoyancy control and energy management, while traditional ballast systems present considerable challenges when operational demands increase, making macro foam technology an intriguing alternative that could address these persistent issues through passive buoyancy enhancement. This study quantitatively evaluates the impact of macro foam integration on NPMS operational parameters by comparing configurations with and without macro foam across multiple performance metrics using actual technical specifications through comprehensive computational analysis examining vehicle mass, buoyancy characteristics, ballast tank specifications, and operational efficiency across four distinct ballast configurations (neutral, forward full, center full, aft full), with performance metrics evaluated using standardized naval engineering protocols based on actual submersible design data. Macro foam integration demonstrated significant improvements across all measured parameters, with tank volume requirements decreasing by 64.4% (from 1466.43L to 521.53L), buoyancy deficit decreasing by 60.7% (from 1.35 to 0.53 tons), total buoyancy increasing by 175% (from 0.65 to 1.79 tons), and ballast requirements reducing by 43.6-60.7% across all configurations, while safety margins improved dramatically with a 3.4:1 emergency buoyancy ratio compared to 0.5:1 without foam. These findings demonstrate that macro foam integration provides fundamental improvements in NPMS operational capability, safety margins, and energy efficiency, with the technology transitioning from optional enhancement to essential operational requirement for practical submersible deployment in modern naval operations.
Co-Authors Achdri Fauzi Nugraha Oloan Achmad Ishlahul Fanany Adi Kurniawan Adi Kurniawan Agoes Santoso Agoes Santoso Ahmadi Munib Amam Baharullah Amiadji Amiadji Amiadji Anson Novendra Pradana Anson Novendra Pradana Ari Budi Setiawan Ari Kuncoro Ari Setiawan Aufal Nanda Oktova Axel Rafoth Azzahra Nirwana Islami Brenda M. Samiadji Dewanto Dewanto Dian Purnamasari Dian Purnamasari Eddy Setyo Koenhardono, Eddy Setyo Edi Jadmiko Eko Sulkhani Yulianto Ericson Posmanov Martua Silalahi Fariz Maulana Noor Fitricia Putri Ricinzky Fitricia Putri Rizki Ricinsi Hesty A Kurniawati, Hesty A I Putu Gedhe Adhi Darsana Irfan Arief Syarief Irfan Syarief Arief Irfan Syarief Arief Irfan Syarief Arief Irfan Syarief Arief Irfan Syarif Arief Jamal, Nur Lintang Candra lintang, lintang candra Mardisuin Siahaan Maria Ulfa Maria Ulfa Muhammad Badrus Zaman Muhammad Badrus Zaman Muryadin Muryadin Muryadin, Muryadin Muttaqie, Teguh Nanang Setiyobudi Nanda Oktova, Aufal Noor, Fariz Nowar Deeb Nowar Deeb Prihandanu, Riyan Bagus Quito Abian Iqtarib Rezvani, Rifki riyan prayogo Setiyobudi, Nanang Sunardi, Sunardi Sunarsih Sunarsih Sunarsih Sutopo Purwono Fitri Teguh Muttaqie Tony Bambang Musriyadi Wasis D Aryawan, Wasis D Wijaya Kusuma Rahadi, Cakra Wijaya, Rifqi Al Baihaqi Zarochman Zarochman Zarochman, Zarochman Zulfakhri, Ahlan