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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Journal of Science and Applicative Technology IJOCE (International Journal of Offshore and Coastal Engineering) Jurnal Konversi Energi dan Manufaktur Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) TeknoKreatif: Jurnal Pengabdian kepada Masyarakat
Elsa Rizkiya Kencana
Ocean Engineering Department, Institut Teknologi Sumatera, South Lampung, Indonesia
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation Other

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 1 
On-Bottom Stability Analysis of Subsea Pipelines Based on DNVGL RP F109 Asfarur Ridlwan; Moehamad Syarif Hidayatullah; Elsa Rizkiya Kencana
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.48398

Abstract

Subsea pipeline must be design as stable as possible to prevent failure, considering the external forces from current, wave and soil conditions. Based on these problems, the on-bottom stability analysis needs to be considered in the design of the subsea pipeline by referring to the requirements set out in the DNVGL RP F109 2017. The results of the analysis are the value of hydrodynamic force in the horizontal direction which are 99,916 N/m and 204,358 N/m for installation and operating conditions respectively, while the hydrodynamic force in the vertical direction for installation conditions is 46,852 N/m and operating conditions is 192,232. N/m. The result of absolute lateral static stability analysis, the pipe with a concrete coating thickness of 40 mm both in installation and operating conditions is stable, because it has met the criteria. The result of generalized lateral stability analysis, in installation conditions, the displacement of 0,5 and 10 times of pipe diameter have reached the safety factor. Meanwhile, in operating conditions, the displacement of 0,5 times of pipe diameter has not reached the safety factor, while for displacement of 10 times the pipe diameter is alright. Therefore, the concrete ballast thickness needs to be added to become 44 mm. Modeling using ANSYS CFX software was carried out to obtain the value of hydrodynamic forces acting on the pipe. The result of pipe modeling in installation conditions are 83,578 N/m and 57,13 N/m for hydrodynamic forces in the horizontal and vertical directions. The model is verified and categorized as a good numerology and modeling due to the simple data and information as an input in ANSYS CFX.
Towards Comprehensive Tsunami Mitigation Study: a Case of Legundi Island Elsa Rizkiya Kencana; Mustarakh Gelfi; Hendra Achiari
Journal of Science and Applicative Technology Vol 5 No 2 (2021): 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.v5i2.408

Abstract

Sunda Strait Tsunami happened in December 2018 due to a flank collapsed of Mount of Anak Krakatoa. Lampung Province was affected by Sunda Strait Tsunami at various locations that close to Mount of Anak Krakatoa. The research is conducted to modelling the tsunami wave that happened at Legundi Island in 1D model using SwanOne software. The methodology of the research is using data input from bathymetric survey and apply the wave transformation equations in the nearshore using SwanOne software to do the 1D model. There are four scenarios to do the wave modelling. All scenarios consider from former study about Sunda Strait Tsunami 2018. The results from all scenarios are verified by prior research from Takabatake (2019) of inundation height in Legundi Island, it is 3,34 m. The result shows the inundation height from wave modelling is a combination of wave height (1,533 m), water depth (1,658 m) and wave setup (0,215 m), and the outcome is 3,406 m. The model shows a fine result because the percentage error of the model is only 0,769%, which is below 5%. This research can be a good approach for another wave modelling in other locations and also to do further research to wave modelling in 2D model.
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.
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.
Analysis of the Global Structural Strength of a 35,000 DWT Single Point Mooring (SPM) Buoy Under Wave Loads Kencana, Elsa Rizkiya; Fatkhurrozi, Muhammad; Nugraha, Alvin Aziz; Kelen, Olga Wulandari
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.v8i2.22071

Abstract

Single Point Mooring (SPM) systems are offshore structures facilitating cargo transfer between tankers and refineries in deeper waters to accommodate larger vessels. The marine environment at SPM sites often features unstable and extreme wave conditions, making it essential to understand the SPM's response to these forces. SPMs include an anchor system with mooring lines secured to the seabed. Evaluating the stress on these lines and the buoy structure under environmental loads is crucial. This research models the SPM structure using dimensional data and mooring line specifications. The hypothesis posits that, based on the significant wave height and 100-year wave period in the Balongan Sea, as well as the minimum breaking load value for a 35,000 DWT SPM, the maximum tension in the mooring lines is 956 kN, which is below 2261 kN. It means safe based on API RP 2KS (2005) standards. Thus, the mooring lines are safe during operations under 100-year environmental loads with a maximum tension of 1732 kN. The maximum stress on the SPM buoy structure is 1.87 MPa and 3.38 MPa in ULS and ALS conditions, respectively.
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.
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.
Comparative Analysis of Taper and Taperless Horizontal Turbine Blades at Labuhan Jukung Beach Buana, Setiadi Wira; Prakoso, Yudhistira Alghifari; Kencana, Elsa Rizkiya; Yunesti, Putty; Wardani, Wulan Kusuma; Persada, Guna Bangun; Madi
Jurnal Konversi Energi dan Manufaktur Vol. 10 No. 2 (2025)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.10.2.10

Abstract

The uneven distribution of electricity demand across Indonesia necessitates the development of Renewable Energy Sources, particularly wind energy. This study evaluates the performance efficiency of horizontal-axis wind turbines equipped with two blade types: taper and taperless, both using the NACA 0012 airfoil. Aerodynamic simulations were conducted using QBlade software. Wind speed data from 2017 to 2022 were sourced from the European Centre for Medium-Range Weather Forecasts (ECMWF), while electricity consumption data were obtained from the Statistics Bureau of Pesisir Barat Regency. A quantitative approach using descriptive graphical analysis was employed to compare the performance metrics of the two blade designs. The results show that the taperless blade achieves higher power coefficient (Cp) and torque coefficient (Ct) values compared to the taper blade, although the taper blade produces greater torque (T). The energy conversion of the taperless blade reached 347.6 kWh, representing an increase of approximately 4.83% over the 331.6 kWh generated by the taper blade. Further analysis indicates that approximately 19 taperless-blade turbines are required to meet the daily electricity demand of 6,545 kWh in Pesisir Barat Regency. These findings support the recommendation to adopt taperless blades for improved wind energy utilization in the region.
Co-Authors Apriliyani, Ulan Asfarur Ridlwan Buana, Setiadi Wira Fatkhurrozi, Muhammad Gelfi, Mustarakh Hendra Achiari Kelen, Olga Wulandari Khaldun, Muhammad Hafidz Ibnu Madi Mochammad Fathurridho Hermanto Moehamad Syarif Hidayatullah Nafisa Nandalianadhira Nugraha, Alvin Aziz Panggabean, Yehezkiel Pardede, Ida Juliana Persada, Guna Bangun Prakoso, Yudhistira Alghifari Sari, Shila Atika Sari, Shila Atika Satriyo Panalaran Setiono, Fadlillah Ihsan Wulan Kusuma Wardani Wulandari, Eka Suci Puspita Yunesti, Putty