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Ocean Engineering: Jurnal Ilmu Teknik dan Teknologi Maritim
Published by Universitas Maritim AMNI Semarang
ISSN : 29635012     EISSN : 29635454     DOI : 10.58192
Core Subject : Engineering,
Engineering Mechanical Engineering
Menyambut baik kiriman yang memberikan wawasan tentang masalah terkini dan utama yang berhubungan dengan ilmu Teknik dan Teknologi Maritim. Artikel bisa ditulis dalam bahasa Inggris atau bahasa Indonesia.
Arjuna Subject : Teknik (semua kategori) - Teknik Kelautan
Articles 159 Documents
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Analisis Kinerja Simpang Jalan Sujadi-Jalan Dawar-Jalan Randam-Jalan Ismail Kabupaten Bengkayang Menggunakan Metode PKJI 2023 Herdina Astya Anindi; Heri Azwansyah; Ferry Juniardi
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5022

Abstract

Intersections are points of traffic conflict that have the potential to cause delays and traffic accidents. The unsignalized four-way intersection at Jl. Sujadi–Jl. Randam–Jl. Dawar–Jl. Ismail in Sanggau Ledo District, Bengkayang Regency, is a strategic intersection that needs to be evaluated for its performance under existing conditions and projections for the next five years. The best course of action was identified by a performance analysis based on the 2023 Indonesian Road Capacity Guidelines. Through three days of weekend and weekday CCTV surveillance, researchers were able to gather data on intersection shape, vehicle speed, and traffic volume. An average delay of 9,89 seconds was shown by the current conditions study, which indicated a level of service A. However, the five-year projection indicated an increased delay of 23,373 seconds with a level of service C. These findings informed the decision to limit the operation hours for medium trucks crossing the crossroads, enlarge major and minor roads, redirect traffic entering Jl. Dawar, and apply alternatives exclusively to the five-year projection condition. This alternate method was effective in achieving a level of service B while also reducing delay by 14,391 seconds.
Studi Potensi Pembangkit Listrik Tenaga Bayu (PLTB) di Pantai Teluk Penyu Cilacap Menggunakan Analisis Distribusi Weibull Ulikaryani Ulikaryani; Agus Santoso; Bayu Aji Girawan; Radhi Ariawan; Unggul Satria Jati; Jenal Sodikin; Ari Kristiningsih
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5092

Abstract

The ever-increasing demand for electrical energy drives the utilization of renewable energy as a sustainable alternative source. Wind energy is one such potential renewable energy source. As a region situated on the southern coast of Java, Cilacap Regency possesses relatively stable wind characteristics, making it a promising location for the development of wind power plants. This study aims to analyze the wind energy potential in the Cilacap region using the Weibull distribution. The Weibull method was employed to determine the shape parameter (k) and scale parameter (c) based on wind speed data. The analysis results indicate an average wind speed of 6.225 m/s in the Cilacap region especially Teluk Penyu Beach, with Weibull parameters of k = 2.972 and c = 6.973 m/s. These values ​​reflect wind characteristics that are relatively stable and favorable for the development of small- to medium-scale wind power plants. The calculated wind power density (WPD) indicates that the coastal area of ​​Cilacap is suitable for harnessing wind energy as an alternative energy source.
Perencanaan Box Underpass Tunnel dengan Metode Kekuatan Batas (Ultimate Design): (Studi Kasus: Bundaran Besar, Kota Palangka Raya, Provinsi Kalimantan Tengah) Kristianni Toendan; Fransisco Happy Riadi Haputra Baru; Maryanto Maryanto
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5104

Abstract

This study aims to design a Box Underpass Tunnel structure using the Ultimate Strength Design method to ensure structural safety, stability, and serviceability. The research applies a descriptive quantitative approach through technical analysis and structural calculations to evaluate the requirements and feasibility of a pedestrian underpass tunnel in the Bundaran Besar area, Palangka Raya City. The data utilized in this study consist of primary project data from the Menara and Bundaran Besar development obtained from the Public Works and Housing Agency of Central Kalimantan Province. The structural design uses K-300 quality concrete and U-41 reinforcing steel with a slab thickness of 45 cm. Structural modeling and analysis are performed using SAP2000 software to determine internal forces and reinforcement requirements. The analysis results show that the main reinforcement for the top slab is D19-50, wall slab is D19-150, and base slab is D19-50, while secondary reinforcement for all structural components uses D13-100. The findings confirm that the Ultimate Strength Design method provides an effective and reliable approach for designing Box Underpass Tunnel structures.
Analisis Frekuensi Getaran dan Diagnosis Kegagalan pada Kompresor Udara Ulir Ganda Berdasarkan Standar ISO 10816-3 Juliyanda Cendrika Zahrawan; Muhammad Alwan Ramadhan Herma; Diki Ismail Permana; Ahmad Taufik Joenoes; Dani Rusirawan
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5162

Abstract

A twin screw air compressor is an important industrial machine whose performance is strongly influenced by its mechanical condition during operation. One of the main parameters used to evaluate machine condition and health is vibration. Excessive vibration may indicate mechanical faults such as mass imbalance, mechanical looseness, and abnormal rotor lobe interaction. This study aims to analyze the vibration characteristics of a twin screw air compressor during operation and to identify fault indications based on frequency spectrum analysis. Vibration measurements were carried out using an Emerson CSI 2130 Machinery Health Analyzer with tri-axial accelerometers at several measurement points on the compressor and electric motor. Time-domain vibration data were processed using the Fast fourier transform (FFT) method to obtain frequency spectra, which were then analyzed based on fundamental frequencies, harmonics, and Lobe mesh frequency (LMF). The vibration amplitude results were compared with ISO 10816- 3 standard to evaluate machine condition. The analysis results show dominant frequencies at 0.5× RPM and 1× RPM indicating mechanical looseness and mass imbalance, as well as the appearance of a frequency around 253 Hz and its harmonics identified as lobe mesh frequency. Evaluation based on ISO 10816-3 indicates that the machine vibration condition ranges from acceptable to dangerous zones at certain measurement points. This study can be used as a basis for machine condition assessment and maintenance recommendations.
Analisis Faktor-Faktor Penyebab Kontaminasi pada Stock Rom di PT Tri Oetama Pesada Michael Kentaro Lendrawan; Deddy Nan Setya Putra Tanggara; Yos David Inso; Yossa Yonathan Hutajulu; Ferra Murati
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5295

Abstract

This study aims to analyze coal stockpiling management in the Stock ROM area to minimize contaminants at PT Tri Oetama Persada, Batapah Village, Timpah District, Kapuas Regency, Central Kalimantan. Coal contamination is a significant issue caused by suboptimal mining, hauling, and stockpiling processes, which may reduce coal quality. This research uses a descriptive quantitative method through field observations, documentation, and analysis of primary and secondary company data. The analysis focuses on stockpiling patterns, management systems, contamination factors, and field implementation. The results indicate that the Stock ROM applies the Chevcon stockpiling pattern with a FIFO (First In First Out) system. However, several problems were identified, including ineffective FIFO implementation, excessive coal pile height, and limited supervision during stacking and reclaiming activities. Contamination factors include poor ROM base conditions, water accumulation, foreign material contamination, and inadequate cleaning and recovery processes. Minimizing efforts include improving FIFO supervision, optimizing Stock ROM design and maintenance, separating materials during stockpiling, and conducting routine temperature and cleanliness monitoring. Improved management practices are expected to maintain coal quality and reduce contamination risks.
Pengaruh Variasi Sudut Inlet Nozzle terhadap Performa Turbin Tesla pada Analisis Eksperimen, Teoritis, dan Simulasi CFD Danur Riswanto
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5301

Abstract

The bladeless Tesla turbine, which converts fluid momentum into rotary motion through viscous boundary-layer interaction with smooth parallel discs, has attracted renewed interest for micro-scale renewable energy applications. Despite this promise, optimizing the inlet nozzle geometry remains crucial to enhancing turbine performance under limited pressure and flow conditions. This study investigates the effect of varying nozzle inlet angles (10°, 20°, and 30°) on the performance of a Tesla turbine with a 19-disc rotor (95 mm diameter, 1.28 mm thickness, 0.6 mm spacing) operating with water at 5 PSI and a maximum flow rate of 4 LPM. A tri-method approach was adopted, combining physical experiments, analytical calculations based on rotational dynamics, and Computational Fluid Dynamics simulation using SolidWorks Flow Simulation. Results consistently demonstrate that the smallest nozzle angle (10°) delivers the highest performance: experimental efficiency of 0.147% and power of 0.140 Watt; theoretical efficiency of 0.23% and power of 0.34 Watt; and CFD-simulated efficiency of 0.340% and power of 0.748 Watt, with an average torque of 0.252 Nm. The findings confirm that a smaller nozzle angle extends the boundary-layer growth along the disc surface, thereby enhancing momentum transfer efficiency. This research provides a validated methodology for nozzle optimization applicable to pico-hydro renewable energy systems.
Rancang Bangun Sistem Monitoring pH Air Laut dan Ballast pada Unmanned Surface Vehicle (USV) Berbasis Internet of Things Moch Izzat Sepviego Al Zandy; Sonhaji Sonhaji; Akhmad Kasan Gupron
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5308

Abstract

This study presents the development of an Internet of Things (IoT)-based monitoring system for seawater pH and ballast water level on an Unmanned Surface Vehicle (USV). The increasing use of USVs in maritime operations requires a monitoring system capable of observing environmental conditions and vessel stability in real time. The proposed system integrates an ESP32 microcontroller, an Analog DFRobot pH sensor, and an HC-SR04 ultrasonic sensor. Sensor data are transmitted using the MQTT protocol through a Wi-Fi network and visualized on a Node-RED dashboard. Experimental results demonstrate that the developed system successfully acquires, transmits, and displays seawater pH and ballast water level data in real time. The integration of both monitoring parameters within a single IoT platform provides an effective solution for supporting autonomous maritime operations and environmental monitoring.
Pengendalian Otomatis Irigasi Menggunakan Arduino Berbasis Relay Martselani Adias Sabara; Qirom Qirom; Dany Sucipto
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5469

Abstract

Ensuring water availability that meets plant needs is a crucial aspect of irrigation management. This study developed a watering control prototype capable of determining pump operation times based on the moisture level of the growing medium while also monitoring the water supply in the tank. The system utilizes an Arduino Uno for data processing, a soil moisture sensor to assess the condition of the growing medium, an HC-SR04 ultrasonic sensor to monitor water levels, and a relay module to interface with and control the DC pump. The Arduino uses data from both sensors to make decisions regarding watering operations. The pump is activated via the relay when the soil is dry and the tank's water supply remains above the specified threshold. Conversely, the pump is deactivated once the soil moisture reaches the target level or the tank's water level drops below the minimum limit. System development involved hardware design, microcontroller programming, sensor calibration, assembly, and functional testing. Tests conducted under various growing medium conditions demonstrated that the soil moisture sensor effectively responds to changes in soil water content, while the ultrasonic sensor reliably monitors water availability in the tank. Integrating both sensors with the Arduino and relay creates an automated watering mechanism that adjusts to soil conditions and water supply levels. This system offers an alternative to manual watering and promotes more controlled water usage in household and small-scale agricultural settings.
6M Fishbone Analysis of Implementation Challenges for MARPOL Convention Annex I: A Case Study of MT. Rosa XVIII St. Ma'rifah Nisrina; Andi Ningrat; Arifin H Abd Majid; Nur Amalianty; Muhammad Aris Kastian5
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i3.5473

Abstract

Annex I of the International Convention for the Prevention of Pollution from Ships (MARPOL) regulates the prevention of oil pollution from vessels and constitutes a mandatory requirement for the operations of oil tankers such as the MT. Rosa XVIII (3,694 Gross Tonnage, PT. Mammiri Line). However, the implementation of these regulations often encounters various technical and operational obstacles in the field. This study aims to identify and analyze the factors causing compliance issues regarding MARPOL Annex I on board the MT. Rosa XVIII, utilizing a cause-and-effect analysis—specifically the "Fishbone Diagram" based on the 6M framework (Man, Machine, Method, Material, Measurement, and Milieu). A descriptive-qualitative research method was employed, involving observations, crew interviews, and a review of vessel specifications and operational records. The analysis reveals that the primary obstacles stem from limited crew competence (Man), maintenance issues with oil separation equipment (Machine, such as the Oily Water Separator), inadequacies in standard operating procedures (Method), errors in filling out the Oil Record Book (Material), inaccuracies in waste level measuring instruments (Measurement), and environmental and operational weather conditions (Milieu). This study offers strategic recommendations to enhance the effectiveness of safety management and marine pollution prevention within the shipping company.

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