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All Journal REKAYASA Adi Widya : Jurnal Pengabdian Masyarakat IJOCE (International Journal of Offshore and Coastal Engineering)
Rudi Walujo Prastianto
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Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics Social Sciences Other

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Peningkatan Budaya Belajar-Mengajar Dan Reputasi Sekolah Melalui Penerapan Sistem Monitoring Pembelajaran Online Rudi Walujo Prastianto; Mahmud Mustain; Herman Pratikno; Handayanu Handayanu; Dwi Purnomo H, Zuhud Ubaidillah & Miftakh D.S
Adi Widya : Jurnal Pengabdian Masyarakat Vol 3 No 2 (2019): ADIWIDYA
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33061/awpm.v3i2.3350

Abstract

Inovasi teknologi untuk pendidikan mutlak dibutuhkan di era Revolusi Industri 4.0, karena teknologi digital dapat memberikan solusi terhadap permasalahan masyarakat di sektor pendidikan. Fleksibilitas, efektifitas dan efisiensi penggunaan teknologi yang tepat dapat menembus ruang dan waktu dalam menjembatani komunikasi antar para pemangku kepentingan dalam proses pendidikan. Penerapan sistem monitoring pembelajaran online sebagai kegiatan pengabdian kepada masyarakat oleh Departemen Teknik Kelautan FTK-ITS dengan mitra sekolah Al Uswah Surabaya, menjadi solusi terhadap sistem yang masih konvensional yang kurang efektif dan efisien serta rentan terhadap ketidakakuratan akibat kesalahan manusia. Pada akhirnya, dengan sistem ini dapat memperbaiki pelayanan dan kinerja, sehingga efektivitas dan efisiensi proses tersebut meningkat. Parameter penting yang direkam menjadi database oleh sistem monitoring pembelajaran terkait kehadiran siswa, kehadiran guru dan durasi waktu proses belajar mengajar dapat dianalisis secara statistik deskriptif. Fitur sistem yang mampu diakses orang tua siswa, bahkan dapat menjadi media promosi untuk meningkatkan reputasi sekolah serta peran serta orang tua/wali siswa dalam mendukung kesuksesan kegiatan pendidikan. Sistem elektronik ini tidak akan memberikan hasil optimum jika tidak diiringi dengan perubahan pemahaman dan perbaikan budaya belajar mengajar guru, siswa, serta manajemen sekolah. Atau sebaliknya, dengan kehadiran sistem ini secara tidak langsung dapat memaksa untuk terjadinya perubahan budaya belajar-mengajar ke arah yang lebih baik secara bertahap. Dalam penelitian ini parameter penting terkait kegiatan proses belajar mengajar selanjutnya dianalisis untuk menemukan hubungan yang mendukung hipotesis terkait peningkatan budaya belajar mengajar dan reputasi sekolah melalui penggunaan sistem berbasis teknologi komunikasi dan informasi ini.
Sizing Optimization Using Genetic Algorithm to Achieve Minimal Offshore Structure Ferdita Syalsabila; Rudi Walujo Prastianto; Daniel Mohammad Rosyid
Rekayasa Vol 15, No 2: Agustus 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i2.15102

Abstract

Accelerating marginal field development must consider the economic factor. While the structural strength must remain capable and robust when subjected to environmental loads. To meet the desired objective in design phase, optimization is used. With the rapid growth of computing technology, the optimization method is developed as more advanced and reduced iteration time. However, the structural evaluation of jacket structure is a complex problem. The usual process of structure evaluation is through finite element analysis, and it is still time-consuming. Thus, surrogate models can evaluate the structure, lowering computational time. This study optimizes the jacket structure to get an affordable and robust minimal jacket structure. Sizing optimization will be performed on the jacket's leg and bracing thickness. For single-objective optimization, weight structure is considered the objective function, and multi-objective optimization adds production cost as the second objective function. The surrogate model uses the radial basis function to predict the relation between design variables and ultimate limit strength. The functions generated from the surrogate model will act as behaviour constraints in the optimization process. For consideration, X-type and V-type bracing configurations are compared. Different results were obtained from the single objective and multi-objective optimization process.
Mooring Chain Fatigue Analysis at the Single Point Mooring Ardjuna Marine Terminal Due to the Combination of Wave, Current, and Wind Loads Using the Fracture Mechanics Method Rafi Manaf Mawardi; Daniel Mohammad Rosyid; Rudi Walujo Prastianto; Raditya Danu Riyanto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9915

Abstract

Mooring chain failure in Single Point Mooring (SPM) systems is a critical risk in offshore operations due to cyclic and complex environmental loading. The combination of waves, currents, and winds produces stress fluctuations that trigger crack initiation and propagation that can potentially lead to structural failure. This study analyzes the fatigue behavior of mooring chains in SPM at Ardjuna Marine Terminal, Java Sea, using a fracture mechanics approach. Cracks are modeled as semi-elliptical surface cracks, and the crack propagation rate is predicted using Paris Law based on Stress Intensity Factor (SIF) evaluation through numerical simulations. The motion responses of SPM and FSO are analyzed using Executive software, while the mooring chain stress analysis is performed using Dynamic simulation software. The results show a maximum SIF value of 1821.8 MPa√mm with a deviation of 1.6% from the analytical solution. The crack propagation rate increases from 2.65×10⁻⁸ to 3.02×10⁻⁵ mm/cycle, resulting in a total fatigue life of 8.3 years. These findings emphasize the importance of fracture mechanics-based evaluation to support inspection and maintenance strategies for SPM mooring systems.
Responses Analysis of Tubular Joints in Offshore Substation Jacket due to Settlement During the Roll Up Process Wildan Malika Candra Alfatih; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v10i1.9916

Abstract

The Offshore Substation plays a crucial role in ensuring the success of Offshore Wind Farm systems in the clean energy transition. During the fabrication stage, the jacket structure used as the Offshore Substation undergoes a fabrication process known as roll-up. During this roll-up process, ground settlement at the fabrication yard may occur, causing the jacket structure to tilt and increasing the risk of structural failure, which can reduce the effectiveness of the jacket structure’s integrity. In this study, a roll-up analysis of the jacket structure was conducted using SACS software with variations in roll-up angles of 0°, 30°, 45°, 60°, 75°, and 96.4°. The analysis results indicate that during the roll up process under settlement conditions, several critical areas were identified, particularly at the K-joint and X-joint, with maximum unity check (UC) values of 0.994 and 0.982, respectively. Further investigation was carried out through a local analysis using finite element software. The local stresses obtained were 264.6 MPa at the X-joint and 323.9 MPa at the K-joint. Since the stress at the K-joint exceeded the allowable stress, a thickness increase of 10 mm was applied to the brace experiencing the maximum stress. As a result, the stress was reduced by 172.29 MPa and was brought below the allowable stress limit.
Local Stress Analysis on Pipeline End Manifold (PLEM) Due to Pipeline Walking in Subsea Pipeline Rizki Cahya Illahi; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v10i1.9917

Abstract

The Pipeline End Manifold (PLEM) is a key component in offshore oil and gas subsea systems that serves as a distribution point for fluid flow from subsea pipelines. One phenomenon that can affect its structural integrity is pipeline walking, which is the progressive axial movement of a pipeline caused by pressure and temperature cycles during operation. This study aims to evaluate the effect of pipeline walking on the stress and deformation of a PLEM structure. Numerical modeling was carried out using AutoPIPE to determine the axial displacement of the pipeline, while ANSYS based on the finite element method was used to analyze the structural response of the PLEM. The results show that pipeline walking produces a maximum axial displacement of 78.5994 mm. The maximum Von Mises stress of 61.222 MPa occurred in the 10-inch piping section, while the maximum deformation was 0.1305 mm. These values indicate that the structure remains within safe limits and possesses sufficient stiffness under the analyzed loading conditions.
Tie-Braces Design Optimization of Breasting Dolphin Structure at Petrochina Marine Terminal Rudi Walujo Prastianto; Yoyok Setyo Hadiwidodo; Dyah Ayu Puspitorini
International Journal of Offshore and Coastal Engineering Vol. 1 No. 1 (2017)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v1i1.2868

Abstract

This paper discusses about optimization design of breasting dolphin’s structural strengthening with additional tie-bra­ces. The breasting dolphin structure has failed because of the increased load on the export activity of tanker. A strengthe­ning project has been carried out in 2014, but the result is considered overdesign and is not optimal. There­fore an optimization design of breasting dolphin structure is carried out as described herein, by looking for the optimum configuration, outside diameter, and wall thickness. The objective function is to determine the minimum weight of the structure. The independent variables are the outside diameter and wall thickness. The constraints are joint deflection check, member stress check, and joint punching shear stress check. There two type analyses performed. Firstly, in-place analysis of several structures with various tie-braces dimensions. The calcu­lation of the initial tie-braces dimension was performed using parameter’s design according to API RP 2A WSD. Secondly is optimization analysis of output data from the in-place evaluation to determine optimum outside diameter and wall thickness of tie-braces, also the weight of the structure. After optimization analysis conducted it is found optimum structural weight be 261 tons, which is some 3 tons lighter than the previous one of 264 tons.
Influence of Geometric Parameters on Fatigue Life of Two-Planar Tubular DKT Joints Based on Fracture Mechanics Under a Combination Loading Muhammad Akbar Hardian; Rudi Walujo Prastianto; Ilham Kurniawan
International Journal of Offshore and Coastal Engineering Vol. 9 No. 1 (2025)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j225800914.v9i1.4521

Abstract

According to SKK Migas, Indonesia has operated 613 units of offshore platforms which is 54.65% of the platforms are more than 20 years old, and 24.63% are between 16-20 years old. With the extension of its operation time, the structural integrity of the old platform will decrease. One of the potential consequences is structural failure due to cyclical loading caused cracks. . This research aims to determine the influence of geometric parameters in DKT twoplanar tubular joints on fatigue life based on fracture mechanics. By varying geometric parameters, we can see the influence of geometric parameters on fatigue life under combined loads of axial, in-plane bending, and out-of-plane bending moments. The tubular joints are modeled locally and analyzed using Finite Element Analysis (FEA), and the crack is modeled as a semi-elliptical form. Fatigue life analysis is performed by varying geometric parameters under the combined loads. After carrying out a sensitivity analysis on all geometric parameters, it was concluded that the gamma parameter had the most influence on the combined load with a sensitivity of 89%.
Co-Authors Daniel Mohammad Rosyid Dwi Purnomo H, Zuhud Ubaidillah & Miftakh D.S Dyah Ayu Puspitorini Ferdita Syalsabila Handayanu Handayanu Herman Pratikno, Herman Ilham Kurniawan Mahmud Mustain Muhammad Akbar Hardian Raditya Danu Riyanto Rafi Manaf Mawardi Rizki Cahya Illahi Wildan Malika Candra Alfatih Yoyok Setyo Hadiwidodo