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All Journal REKAYASA Journal of Science and Applicative Technology IJOCE (International Journal of Offshore and Coastal Engineering) Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) TeknoKreatif: Jurnal Pengabdian kepada Masyarakat
Mochammad Fathurridho Hermanto
Ocean Engineering Department, Institut Teknologi Sumatera, South Lampung, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Kehandalan Struktur Anjungan Lepas Pantai Terpancang Empat Kaki di Perairan Natuna Mochammad Fathurridho Hermanto; Nafisa Nandalianadhira
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16663

Abstract

The design of offshore platforms in Indonesia generally uses Working Stress Design (WSD) method rather than Load and Resistance Factor Design (LRFD) method. Whereas the LRFD method produces designs that better describe real conditions with load and capacity factors. The load and capacity factors are obtained from consideration of the uncertainty or randomness of their values. One of the load factors used is the environmental load factor. The environmental load factor of LRFD method is obtained based on environmental characteristics not in Indonesian waters. There are differences in the environmental characteristics of each water. Uncertainty of environmental loads in the offshore platforms design is wave height, current velocities, and wind speed. To get a structure designed according to the characteristics of the waters in Indonesia, an environmental load factor is needed in accordance with the characteristics of Indonesian water. To achieve that, structural reliability analysis is needed. Structures reliabilty represents the possibility of the structure's performance criteria being met which is expressed by the reliability index. The reliability index of structures designed using the WSD method used as a reference for LRFD method. In this study, reliability analysis was carried out using the reserve strength ratio value from the pushover analysis on WSD method. The reliability index of the structure model is 4.10. This value is categorized as high reliability. This results can be used as a reference to determine the environmental load factor of Indonesian water in the future.
Studi Komparasi Stabilitas Pipa Bawah Laut dengan DNVGL-RP-F109 dan Elemen Hingga Nafisa Nandalianadhira; Mochammad Fathurridho Hermanto
Rekayasa Vol 16, No 2: Agustus 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i2.18804

Abstract

Deployment under the sea without being excavated or buried is the most effective alternative. The subsea pipeline must be ensured to be stable on the seabed, not experiencing movement when exposed to environmental forces. There are two main things that must be analyzed in the design process and stability analysis of subsea pipelines, hydrodynamic and hydrostatic forces. In the subsea pipeline design process, one of the most important steps is determining the wall thickness. One standard that is widely used is DNVGL-ST-F101. The diameter and thickness of the subsea pipeline are important parameters for determining subsea pipeline stability. The relationship between the forces acting to the subsea pipeline and the resistance of the soil (seabed) has been regulated in DNVGL-RP-F109. In addition, stability calculations can also be performed based on subsea pipeline modeling on the seabed using the finite element method. Based on these two methods, the vertical and lateral stability of the subsea pipeline can be determined. If the subsea pipeline is unstable, it is necessary to add concrete coating. Based on the pipe properties and environmental data, the wall thickness of the subsea pipeline is 18.203 mm. To be able to meet vertical and lateral stability for operating and installation conditions, 41 mm thick concrete coating is required. The greatest hydrodynamic force occurs in operating condition of 165.693 N/m based on DNVGL-RP-F109 and 154.150 N/m based on finite element. The difference of those result is only 6.96%.
Sosialisasi Kemaritiman kepada Masyarakat Umur Produktif di Kalianda, Lampung Selatan Hermanto, Mochammad Fathurridho; Nandalianadhira, Nafisa; Kencana, Elsa Rizkiya; Khaldun, Muhammad Hafidz Ibnu; Panalaran, Satriyo
TeknoKreatif: Jurnal Pengabdian kepada Masyarakat Vol 3 No 2 (2023): TEKNOKREATIF : Jurnal Pengabdian Kepada Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LP2M), Institut Teknologi Sumatera, Lampung, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/teknokreatif.v3i2.1594

Abstract

Indonesia adalah negara kepulauan, namun keberadaan laut sampai sekarang masih dianggap sebagai penghalang oleh masyarakat Indonesia. Potensi maritim Indonesia seharusnya dapat dilihat sebagai peluang yang sangat besar. Indonesia akan memasuki masa bonus demografi, dengan penduduk usia produktif (15-64 tahun) mendominasi. Di sisi lain, terdapat ancaman yang tidak kalah besarnya. Kegagalan mengoptimalkan kesempatan membuat negara Indonesia tidak bisa melaju secara maksimal, atau bahkan dapat mengalami kemunduran. Perlu dilakukan kegiatan pengabdian kepada masyarakat. Kegiatan tersebut bertujuan untuk meningkatkan kesadaran masyarakat usia produktif tentang potensi diri dan generasinya yang akan mendominasi negara maritim ini beberapa tahun mendatang. Dengan kegiatan sosialisasi yang dilaksanakan di SMA Negeri 1 Kalianda dan SMA Negeri 2 Kalianda, didapatkan peningkatan pemahaman siswa siswi sebesar 30.4% dan 26.8% untuk masing masing sekolah secara berurutan yang didapatkan dari pretest dan posttest. Hasil pretest sebelum sosialisasi dan posttest setelah sosialisasi menunjukan adanya peningktan yang signifikan terhadap pemahaman siswa tentang kemaritiman.
Post-Pandemic Risk Assessment and Safety Management at Academic Institution Environment Santi Frestiqauli; Nafisa Nandalianadhira; Mochammad Fathurridho Hermanto; Samuel Samuel
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19333

Abstract

The World Health Organization (WHO), on March 11, 2020, declared the novel coronavirus (COVID-19) outbreak a global pandemic. Safety, people protection, equipment and environmental protection are serious concerns anywhere, including in an institution or university environment. In the meantime, the number of accidents has increased in academic institutions nationwide. Students, staff, lecturers, and academic personnel are involved in activities that expose them to minor to major fatal accidents. This study developed risk assessment using combinations of hazards and risk factors to scale measures in a risk reduction action plan. Health, safety and environment risk assessment conducted for 27 assessed hazardous activities at 18 locations divided into three areas: laboratories, public facilities, and offices at the Department Ocean Engineering Sepuluh Nopember Institute of Technology. The frequency and severity of health hazards were higher in accumulation number, which is 790, compared to safety hazards, which score 509, and environmental hazards, with 104. The highest number for accumulation of potential hazards in health, safety, and environment for laboratories area is 883, followed by accumulation of potential hazard at health, safety, and environment for office area and public facilities area with scores 239 and 281.
Gulf of Lampung Bamboo Fixed Net Cages Structural Design Identification Sari, Shila Atika; Hermanto, Mochammad Fathurridho; Kencana, Elsa Rizkiya
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 2 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.22072

Abstract

Renewable materials are being discussed and researched more recently. One renewable source of material is plants, either with a long life like wood or a short life like bamboo. In Indonesia, bamboo is widely used also for the structures of fixed net cages. This research aims to analyze the structure of the fixed bamboo net cage installed in the waters of Gulf Lampung. The analysis used in this paper is in place. The in-place analysis will give the unity check and deflection result due to load combined by the standard BKI Guidelines for Aquaculture. Based on the results, the structure has met the standard in operation conditions with the maximum unity check value of 0.52 on the group pile. Nevertheless, the largest unity check value of 1.20 on group piles in storm conditions is due to increased lateral loading. The result of deflection already has good serviceability, with a maximum horizontal deflection value occurring in storm conditions of 0.58 cm and a maximum vertical deflection in operation conditions of 0.89 cm. The structure of the fixed net cages has yet to meet the requirements during storm conditions by unity check.
Studi Komparasi Karakteristik Gelombang Pesisir Barat Lampung Hermanto, Mochammad Fathurridho; Nandalianadhira, Nafisa; Kencana, Elsa Rizkiya; Sari, Shila Atika; Apriliyani, Ulan; Pardede, Ida Juliana; Setiono, Fadlillah Ihsan; Wulandari, Eka Suci Puspita
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 3, November 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i3.36477

Abstract

The need for ocean data is important to increase the utilization of ocean areas. A facility, development, system, or structure in the ocean cannot be planned properly without data in that ocean. One of the important data in water areas is ocean waves. In the offshore area of Pesisir Barat, wave characteristic data is still very hard to find. Knowledge of the ocean characteristics of the Pesisir Barat waters is needed, one of which is in the form of wave characteristics. To obtain more comprehensive information, two satellite reanalysis data sources were analyzed. The average height of significant wave height in the Perisir Barat is 1.75 to 2.25 m from BMKG and only 0.25 to 1.00 m from ECMWF. Based on the wave direction, the ocean waves in the Pesisir Barat move North to Northwest (NW), perpendicular to the coastline. The distribution of the annual maximum significant wave height matches the theoretical Log-normal distribution. Extreme significant wave height is obtained with a value of 4.10 to 4.29 m for a 100-year return period and 3.09 to 3.39 m for a 1-year return period. In terms of design or study of maritime potential in the western waters of Lampung, these values can be a benchmark as a basic study of wave characteristic data.
Western Lampung Offshore Wind and Wave Data Correlation Analysis Hermanto, Mochammad Fathurridho; Nandalianadhira, Nafisa; Puspita, Eka Suci; Hutajulu, Iin Debora
Journal of Science and Applicative Technology Vol 8 No 2 (2024): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v8i2.2012

Abstract

Wind and waves are the two most dominant environmental parameters in the sea. The availability of these two data is crucial in the design process of offshore and onshore buildings and the development of renewable energy from wind or wave. Numerous analyses have been done on each parameter, but none have tested their correlation specifically in the waters of the western Lampung. This study aims to find a correlation between these two parameters. The study used 20 years of wind and wave data from BMKG. The average wind speed data obtained was about 4,17 - 5,13 m/s. The mean significant wave height obtained was about 1,89 - 2,09 m. BMKG gives more direction with a huge wind-blowing duration (more than 500 hours), wind-blowing direction data are dominantly from SSE, WNW, and WSW. However, wave direction data is going to N and NE. This study found no correlation between wind and wave direction on the Western Lampung Offshore. Based on data from the time series of wind and wave that have been analyzed, continuously higher wind speeds result in higher wave heights.
Analysis of Wind Potential as a Form of New and Renewable Energy at Manna in Bengkulu Panggabean, Yehezkiel; Hermanto, Mochammad Fathurridho; Kencana, Elsa Rizkiya; Nandalianadhira, Nafisa
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 1 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i1.528

Abstract

The energy from fossil fuels is declining due to modern society's high energy demands. This study investigates the potential of renewable energy, focusing on wind energy as a sustainable solution. It analyzes the Weibull and Rayleigh distributions to assess wind speed suitability in Bengkulu. The average wind speed at Manna Beach is 2.5 m/s, with a minimum of 0.01 m/s and a maximum of 10.01 m/s. Data validation tests were conducted at a height of 10 meters using Chi-Square and Kolmogorov-Smirnov methods. The chi-square test results indicated the values of 0.11 for Weibull and 0.42 for Rayleigh. The Kolmogorov-Smirnov test yielded value of 0.82 for Weibull and 0.84 for Rayleigh. Therefore, the suggesting Weibull was more suitable. Furthermore, using the Aventa AV-7 wind turbine, an annual output of 11,096.29 kWh can supply 30% of the electricity demand, which requiring 199 turbines. Ultimately, 40 turbines effectively contribute 6% or 440,621.94 kWh of total demand.
Indonesian Natural Materials for Sustainable Ocean Structures: Synergizing Nibung Wood Characterization, Fiber Composites, and Processing Innovations Sitorus, Bintang Natan; Hermanto, Mochammad Fathurridho; Nandalianadhira, Nafisa
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 2, July 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.vi.45362

Abstract

This research explores the potential of Indonesian natural materials - specifically Nibung wood (Oncosperma tigillarium) and vegetable fibers (jute, ironwood) - for sustainable ocean structures. The literature review focused on: (1) mechanical and physical characterization of Nibung wood; (2) optimization of Nibung-fiber thermoplastic composites using the Taguchi-GRA method; (3) evaluation of jute fiber resistance to seawater uptake; and (4) innovation of traditional Bajau modular connection techniques. The narrative-thematic method categorizes the findings based on material characteristics, surface modification, structural performance, and marine tidal applications. Results showed Nibung wood has strength class II-III (density 0.53 g/cm³; MOE 5,848 MPa; MOR 4,325 MPa), optimized Nibung-rPP WPC (<2% water absorption, tensile strength >30 MPa), and jute fibers experienced ≤10% impact reduction after 84 days of sea immersion. Bajau- style modular joint detailing improved airflow and minimized moisture accumulation. Recommendations include integration of Nibung wood in local thermoplastic WPC, alkali-coupling treatment, and adaptation of modular joints for modern oceanstructures. 
Co-Authors Apriliyani, Ulan Elsa Rizkiya Kencana Hutajulu, Iin Debora Khaldun, Muhammad Hafidz Ibnu Nafisa Nandalianadhira Panggabean, Yehezkiel Pardede, Ida Juliana Puspita, Eka Suci Samuel Samuel Santi Frestiqauli Sari, Shila Atika Sari, Shila Atika Satriyo Panalaran Setiono, Fadlillah Ihsan Sitorus, Bintang Natan Wulandari, Eka Suci Puspita