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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 Al-Fawa'id : Jurnal Agama dan Bahasa 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 Languange, Linguistic, Communication & Media 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.
Effect of Gawn Series Propeller Camber Ratio Variations on Fuel Consumption Using Engine Propeller Matching Rakhim, Maulana; Baidowi, Achmad; Indiaryanto, Mahendra
International Journal of Marine Engineering Innovation and Research Vol. 11 No. 1 (2026)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v11i1

Abstract

Propeller blade geometry, particularly the camber ratio, plays a critical role in determining hydrodynamic behavior and fuel consumption in marine propulsion systems. This study investigates the influence of camber ratio variation on the performance of a Gawn Series propeller by applying an Engine–Propeller Matching (EPM) approach. Open-water performance characteristics, including thrust coefficient (KT), torque coefficient (KQ), and open-water efficiency (η₀), were obtained through Computational Fluid Dynamics (CFD) simulations for four camber configurations of 0%, 1%, 1.5%. The numerical model was validated using resistance and open-water test data, yielding deviations below 5% and 3%, respectively, which confirms the reliability of the simulation results. The analysis shows that higher camber ratios generally increase thrust and torque as a result of strengthened pressure gradients and enhanced flow acceleration along the suction side of the blade, with the 1% camber configuration demonstrating the highest efficiency at J = 0.9 (η₀ = 0.596), representing a 3.85% improvement over the baseline. Matching the resulting propeller load curves with the performance envelope of a 2 × 3900 kW engine setup provides insight into optimal operating conditions and specific fuel consumption across the vessel’s working speed range. The 1% camber variant consistently delivers better fuel economy, maintaining safe operating points. Overall, these results underscore the substantive influence of camber modification on propeller hydrodynamics and propulsion efficiency, identifying the 1% camber configuration as the most suitable option for 60-m high-speed vessels based on combined hydrodynamic, fuel, and operational criteria within the EPM framework.
Improvement of Impinging Jet Casing Design On Savonius Turbine Performance Rosyada, Amron; Baidowi, Achmad; Sunarsih
International Journal of Marine Engineering Innovation and Research Vol. 11 No. 1 (2026)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v11i1

Abstract

Savonius turbine is one of the various devices used to convert fluid flow energy into electricity. Due to its low efficiency, many studies have been conducted to increase its performance. In this paper, the effect of impinging jet stream direction to concave side of returning blade has been observed. There are 4 casing designs; base casing design (BCD) from previous work and 3 proposed designs which have impinging jet stream direction perpendicularly with the concave side of returning blade azimuth position of 60° (D-I), 75° (D-II), and 90° (D-III) respectively. The study employed two-dimensional CFD (Compu-tational Fluid Dynamic) transient method using Ansys Fluent with Kω-SST (Shear-Stress Transport) as the turbulence model. The result shows that all casing designs are able to rise up the coefficient of power (Cp) of conventional turbine design. Furthermore, D-III and D-II have better performance than BCD at all tip speed ratios (TSRs) while D-I’s Cp curve shows several intersections. D-III surpasses BCD’s peak performance, At TSR =1, by 8%. By applying D-III casing design, the best caseless turbine efficiency (23%) could be improved up to 43% at the same working condition (TSR=0.8). Additionally, the shorter flow passage could increase the impinging jet stream velocity
Bridging Sacred and Profane Knowledge: The Integration of Diniyah and General Curriculum in Package B Progam at PKBM Cahaya Sunnah Wahyuningsih, Yenik; Baidowi, Achmad; Ma'ruf, Chasan; Sugati, Endri; Azizah, Fayza
Jurnal Al-Fawa'id : Jurnal Agama dan Bahasa Vol 16 No 1 (2026): Maret
Publisher : STAI Ali bin Abi Thalib Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54214/alfawaid.Vol16.Iss1.1032

Abstract

This research aim to analyze curriculum design, breakdown, grouping, and execution of Package B in enhaching the caliber of graduates at PKBM Cileungsi. This research analyze examines the gap between the non-formal education curriculum of Package B and the quality needs of graduates based on religious values at PKBM Cileungsi. It. The research uses a qualitative case study approach at PKBM Cahaya Sunnah Cileungsi, employing interviews, focus group discussions (FGD), and documentation. The data analysis process involves data condensation, data display, and conclusion drawing. To ensure the validity of the findings, source triangulation and member checking are employed. The results show that the Package B curriculum integrates diniyyah (Islamic religious studies) and general education, with a 70 percent emphasis on religious content. The curriculum is designed by the foundation’s internal team through annual work meetings, implemented in a structured manner with subject distribution based on teachers’ competencies, and evaluated periodically every semester. Student achievements include memorization of up to 30 juz, while others achieve around 16 juz, mastery of approximately 90 percent of 42 Hadiths from Arba’in, and academic abilities equivalent to junior high school level, along with significant improvement in religious character. The study concludes that the Package B curriculum model is effective in improving graduate quality through a systematic integration of diniyyah and general education based on religious values. This study is significant because it contributes as a reference for developing PKBM curricula that are religiously based, adaptive, contextual, and capable of enhancing the quality of equivalency education graduates.
Structural Response Analysis During Slamming Events on Speedboats Using Aluminum Material Wulandari, Amalia Ika; Syahab, Husein; Baidowi, Achmad; Adietya, Berlian Arswendo
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 3 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i3

Abstract

The structural response analysis of an aluminum speedboat during slam-ming due to regular waves was conducted using the one-way fluid-structure interaction method. This method involves generating waves through hydrody-namic diffraction to obtain loads, which are then applied to the ship's struc-ture and analyzed using finite element analysis. It is known that the greater the force generated from slamming , the stress and deformation at the critical load point will increase. In addition to being influenced by the critical point, the maximum stress is also influenced by the ship's construction design. It has been found that the highest stress and deformation occur on the surface of the plate that is not supported by the transverse construction. Therefore, it can be concluded that the construction design can influence the magnitude of the structural response to the slamming event . Efforts that can be made by ship designers and manufacturers are to convert ships by using materials that are better at absorbing loads, such as the use of sandwich materials
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 Azizah, Fayza Azzahra Nirwana Islami Berlian Arswendo Adietya Brenda M. Samiadji 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 Indiaryanto, Mahendra 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 Maruf, Chasan 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 Rakhim, Maulana Rezvani, Rifki riyan prayogo Rosyada, Amron Setiyobudi, Nanang Sugati, Endri Sunardi, Sunardi Sunarsih Sunarsih Sunarsih Sutopo Purwono Fitri Syahab, Husein Teguh Muttaqie Tony Bambang Musriyadi Wahyuningsih, Yenik Wasis D Aryawan, Wasis D Wijaya Kusuma Rahadi, Cakra Wijaya, Rifqi Al Baihaqi wulandari, amalia ika Zarochman Zarochman Zarochman, Zarochman Zulfakhri, Ahlan