Article Per Year (5 Year)
p-Index From 2021 - 2026
1.383
P-Index
This Author published in this journals
All Journal Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) Asian Journal Science and Engineering Journal of Engineering Science and Technology Management Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Majalah Ilmiah Teknologi Elektro
Shofa Dai Robbi
Unknown Affiliation
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

Published : 8 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search
Journal : journal of engineering science and technology management

 1 
Analysis of Electrical Voltage Instability Causes in Auxiliary Engine No. 2 Aboard MV. HANGLIMA Bima Nurrahma; Antonius Edy Kristiyono; Agus Prawoto; Shofa Dai Robbi; Sri Mulyanto
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 2 (2026): June 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i2.410

Abstract

This study investigates the factors contributing to electrical voltage instability in Auxiliary Engine No. 2 aboard MV. Hanglima. The research was motivated by operational disruptions where the voltage output dropped significantly from the standard 440V to 290V, leading to blackouts when the generator operated independently. Employing a qualitative research method utilizing the Fishbone (Ishikawa) diagram for root cause analysis, data was collected through onboard observation, documentation, and interviews with the engineering crew. The analysis revealed that the instability was primarily caused by mechanical failure in the alternator bearings, which had approached their operational limit, leading to an unbalanced rotor rotation. This mechanical imbalance caused friction between the rotor and stator, resulting in insulation leakage (short circuits) within the windings. Corrective measures implemented included a comprehensive overhaul, re-insulating the rotor and stator windings using insulating varnish, and replacing the worn bearings. These actions successfully restored the voltage output to a stable 445V, ensuring the safety and efficiency of the vessel's electrical system.
Analysis Of The Causes Of Suboptimal Steering Gear Performance Based On Maintenance Factors And The Quality Of Spare Parts On MV. Mulianim Muhammad Dion Putra Widjaya; Ari Yudha Lusiandari; Sri Mulyanto Herlambang; Antonius Edy Kristiyono; Shofa Dai Robbi
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 3 (2026): September 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i3.484

Abstract

The operational reliability of a ship's steering gear system is vital for navigation safety and vessel maneuverability, as regulated by International Maritime Standards (SOLAS). However, performance degradation often occurs due to inadequate maintenance practices and spare part constraints. This study aims to analyze the root causes of suboptimal steering gear performance on MV. Mulianim using a qualitative case study approach. Data were gathered through direct field observations, semi-structured interviews with chief and engine officers, and documentation audits (Engine Log Book and PMS records) over a 12-month period. Data validity was verified through source triangulation and analyzed using Miles and Huberman’s interactive model combined with Cause-and-Effect Analysis. The results revealed that steering gear hydraulic pressure dropped below the operational baseline (85–90 bar vs. standard 100 bar) due to high fluid turbidity, degraded viscosity, and internal bypasses. This condition was directly triggered by a 26.7% delay in Planned Maintenance System (PMS) tasks and severe spare part stockouts (25% critical spares unavailable). To prevent navigational hazards, strict adherence to PMS schedules and optimization of the spare part procurement pipeline are strongly recommended.
Co-Authors Adiisty Nur Fadilla Agus Prawoto Antonius Edy Kristiyono Ari Yudha Lusiandari Arjun Widiansyah Aziz Nugroho Bima Nurrahma Dirhamsyah Dirhamsyah Edi Kurniawan Elly Kusumawati Frenki Imanto Hidayat, Rochmad Imam Sutrisno Marshelino Chandra Suhartono Mochammad Zaqi Arif Muchammad Afilla Nurrahman Muh. Darwis Muhammad Dion Putra Widjaya Nasri Nasri Putri, Indah Ayu Johanda Sianturi, Intan Sonhaji *), Ferra Ika Wardani Solechan Sri Mulyanto Sri Mulyanto Herlambang Trisnowati Rahayu Wulan Marlia Sandi