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Pengembangan Teknologi Kapal Tanpa Awak Guna Mendukung Operasi dan Latihan TNI Angkatan Laut Hendri Priyono; Sovian Aritong; Mahesa Akbar
Jurnal Indonesia Sosial Sains Vol. 3 No. 03 (2022): Jurnal Indonesia Sosial Sains
Publisher : CV. Publikasi Indonesia

Ship resistance is an important factor in ship design. Technological developments are carried out to reduce the magnitude of the ship's resistance. By reducing the drag of the ship, it can improve the performance of the ship with the same engine power as the previous design. In this study, we will redesign the hull of the Indonesian Navy's unmanned vessel in order to increase the performance of the ship's speed. The process of redesigning the hull of this unmanned ship uses the numerical method using Maxsurf software in analyzing hydrodynamic performance. The results of the drag analysis carried out with a redesign show a decrease in the value of the ship's resistance by 1143 KN and the required power of 9.98 HP. From the results that this study obtained compared to the initial design of 60%.

Redesign of Unmanned Surface Vessel (USV) Hull to Increase the Performance and to Support Naval Operations Hendri Priyono; Sovian Aritong; Mahesa Akbar
Journal Research of Social Science, Economics, and Management Vol. 1 No. 7 (2022): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

The Indonesian Navy's current unmanned vessel is the first unmanned ship made by the Indonesian Navy's Research and Development Service. This vessel is not optimal, it is necessary to redesign the hull using the model simulation method with the assistance of Maxsurf software. By using this maxsurf software, it will be easier to analyze hydrodynamic performance, one of which is the vessel's resistance. The redesign shows the results that there is a reduction in ship resistance. By redesigning, the hull of the Indonesian Navy's unmanned vessel by using the model simulation method with the assistance of the Maxsurf software in analyzing hydrodynamic performance, we get the resistance value at maximum speed. Meanwhile, the power required by the ship is at maximum speed so that the speed shows an increase in maximum ship speed, thereby fulfilling the operational requirements and producing good maneuverability. Therefore, it can be concluded that the ship after being redesigned can be better.

Studi Prospektif Penggunaan Drone Kargo di Daerah Terdepan, Terpencil dan Tertinggal (3T) dan Terdampak Bencana Dr. Ir. Yazdi Ibrahim Jenie, ST.,MT.; Chandra Liuswanto; Mahesa Akbar; Novyanto Widadi
WARTA ARDHIA Vol 48, No 2 (2022)
Publisher : Badan Kebijakan Transportasi, Kementerian Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/wa.v48i2.485.31-46

Saat ini, salah satu potensi yang menjadi fokus saat ini adalah pemanfaatan drone sebagai wahana logistik (pengiriman barang), sesuai dengan prediksi dari laporan PwC [1] di tahun 2018, yang menempatkan drone transportasi di peringkat 3 pemanfaatn drone berdasarkan nilai pasarnya. Pada artikel ini, sebuah studi prospektif terhadap implementasi drone kargo di Indonesia dijabarkan, utamanya di daerah Terpencil, Terluar, dan Tertinggal (3T) dan daerah terdampak bencana. Beberapa simulasi parametrik dilakukan untuk menganalisis faktor-faktor krusial implementasi pada enam parameter, yakni kebutuhan logistik, tipe drone, trayek, infrastruktur, regulasi, dan lini masa realisasi. Hasil dari simulasi parametrik ini menunjukkan delapan prospek implementasi drone kargo. Untuk operasi antar pulau, dalam jangka waktu dekat, pengiriman bahan medis seperti distribusi vaksin dinilai akan sangat menguntungkan. Sebaliknya, untuk operasi di area pegunungan, drone kargo masih akan terhambat masalah performanya di ketinggian. Terakhir, pada kasus daerah terdampak bencana, drone kargo dinilai sudah sangat mungkin diimplementasikan dengan banyaknya contoh riil. Di masa mendatang, studi ini menemukan bahwa operasi drone kargo dapat mencakup area yang lebih luas. Dengan memilih beberapa bandara strategis, trayek drone yang terintegrasi secara nasional dapat dirancang hanya dengan kurang dari 10 hub utama, setidaknya dalam lima tahun ke depan.

PENGARUH BENTUK PENAMPANG SEKSIONAL DEK JEMBATAN BENTANG PANJANG TERHADAP ANALISIS KECEPATAN KRITIS FLUTTER Angga Dwi Saputra; Leonardo Gunawan; Rianto Adhy S; Mahesa Akbar
Jurnal Jalan-Jembatan Vol 39 No 2 (2022)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Flutter is one of the most notable aeroelastic phenomenons in long-span bridges and needs to be evaluated carefully in the design phase as it might cause catastrophic structural failure. Numerical and experimental methods can investigate flutter on a deck bridge. However, the numerical methods could be less accurate for a complex-shaped deck, such as a deck equipped with railings and bluff cross-section bridges. Therefore, experimental methods using wind tunnels are more convenient for validating the flutter phenomenon on a bridge deck. The study was conducted to understand the effects of long-span bridge cross-section shape on the critical flutter speed analysis. The method is a hybrid numerical procedure, combining a wind tunnel test to identify the flutter derivatives coefficients and a numerical method to determine the critical flutter speed limit. The testing method developed in this research was used for both torsional and coupledâ€“flutter cases. In the case of Testing Model I (thin plate), the developed method predicted the critical flutter speed of 16.7 m/s, which is close to the theoretical calculation using the thin-plate approach of 18.04 m/s. While in the case of testing model II (bluff body), the predicted flutter speed is 14.8 m/s which is close to the experiment result of 15 m/s. In the study case of the First Tacoma Bridge, the developed method could accurately predict the critical flutter speed with an error of only 4.3%. Hence, according to the study, the developed analysis method can accurately predict the flutter speed for both torsional and coupled flutter. Keywords: bridge, aeroelastic, flutter, wind tunnel, numerical.

Active Vibration Control of a Flexible Spacecraft Structure Agung, Rizqy; Kusni, Muhammad; Adhy Sasongko, Rianto; Eko Poetro, Ridanto; Gunawan, Leonardo; Akbar, Mahesa
International Journal of Aviation Science and Engineering - AVIA Vol. 6 No. 2: (December, 2024)
Publisher : FTMD Institut Teknologi Bandung

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In this paper, the spacecraft that evaluated has two motion mode, rigid body mode and flexible mode and it isoperated in low earth orbit. The rigid body mode is related to the attitude of spacecraft and flexible mode is relatedto vibration that occurs on the spacecraft structure. The vibration that occurs on the spacecraft structure may causeperformance degradation during operation. Hence, the active control vibration is applied to overcome the problemdue to the vibration phenomenon on spacecraft. The active control system was designed by using two methods,Pole-Placement Method and Linear Quadratic Regulator (LQR) Method, and those two methods are solved byusing numerical method. The result of Pole-Placement Method shows the vibration is reduce in less than 0.5 unitof time. Whereas, the most suitable control parameter input based on the LQR Method could reduce vibration inless than 8 unit of time. The LQR method provides more parameter variation; thus, the system could be controlledand adjusted due to its design requirement. Based on the LQR Method when the attenuation time is 8 unit of time,the energy required by the actuator is 84% less than that of the Pole-Placement Method.

Studi Prospektif Penggunaan Drone Kargo di Daerah Terdepan, Terpencil dan Tertinggal (3T) dan Terdampak Bencana Jenie, ST.,MT., Dr. Ir. Yazdi Ibrahim; Liuswanto, Chandra; Akbar, Mahesa; Widadi, Novyanto
WARTA ARDHIA Vol. 48 No. 2 (2022)
Publisher : Sekretariat Badan Kebijakan Transportasi, Kementerian Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/wa.v48i2.485.31-46

Saat ini, salah satu potensi yang menjadi fokus saat ini adalah pemanfaatan drone sebagai wahana logistik (pengiriman barang), sesuai dengan prediksi dari laporan PwC [1] di tahun 2018, yang menempatkan drone transportasi di peringkat 3 pemanfaatn drone berdasarkan nilai pasarnya. Pada artikel ini, sebuah studi prospektif terhadap implementasi drone kargo di Indonesia dijabarkan, utamanya di daerah Terpencil, Terluar, dan Tertinggal (3T) dan daerah terdampak bencana. Beberapa simulasi parametrik dilakukan untuk menganalisis faktor-faktor krusial implementasi pada enam parameter, yakni kebutuhan logistik, tipe drone, trayek, infrastruktur, regulasi, dan lini masa realisasi. Hasil dari simulasi parametrik ini menunjukkan delapan prospek implementasi drone kargo. Untuk operasi antar pulau, dalam jangka waktu dekat, pengiriman bahan medis seperti distribusi vaksin dinilai akan sangat menguntungkan. Sebaliknya, untuk operasi di area pegunungan, drone kargo masih akan terhambat masalah performanya di ketinggian. Terakhir, pada kasus daerah terdampak bencana, drone kargo dinilai sudah sangat mungkin diimplementasikan dengan banyaknya contoh riil. Di masa mendatang, studi ini menemukan bahwa operasi drone kargo dapat mencakup area yang lebih luas. Dengan memilih beberapa bandara strategis, trayek drone yang terintegrasi secara nasional dapat dirancang hanya dengan kurang dari 10 hub utama, setidaknya dalam lima tahun ke depan.

Pengembangan Teknologi Kapal Tanpa Awak Guna Mendukung Operasi dan Latihan TNI Angkatan Laut Priyono, Hendri; Aritong, Sovian; Akbar, Mahesa
Jurnal Indonesia Sosial Sains Vol. 3 No. 03 (2022): Jurnal Indonesia Sosial Sains
Publisher : CV. Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jiss.v3i03.555

Ship resistance is an important factor in ship design. Technological developments are carried out to reduce the magnitude of the ship's resistance. By reducing the drag of the ship, it can improve the performance of the ship with the same engine power as the previous design. In this study, we will redesign the hull of the Indonesian Navy's unmanned vessel in order to increase the performance of the ship's speed. The process of redesigning the hull of this unmanned ship uses the numerical method using Maxsurf software in analyzing hydrodynamic performance. The results of the drag analysis carried out with a redesign show a decrease in the value of the ship's resistance by 1143 KN and the required power of 9.98 HP. From the results that this study obtained compared to the initial design of 60%.

PERSEPSI STAKEHOLDER TERHADAP PENGGUNAAN ROLLER BARRIER DALAM SISTEM KESELAMATAN JALAN DI INDONESIA Siti Rahma; Rudy Hermawan Karsaman; Aine Kusumawati; Mahesa Akbar
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.8123

Roller barrier is a road safety barrier innovation that uses a rotating cylinder system to absorb collision energy. Although it has been installed at 15 road sections in Indonesia and proven to contribute to reduced accident fatalities, its adoption remains limited. This study aims to analyze the perceptions of key stakeholders toward roller barrier usage in Indonesia through a descriptive qualitative approach with a multi-informant study design. Data were collected through in-depth semi-structured interviews with the West Java Provincial Transportation Agency (Dishub) and roller barrier distributors in Indonesia. Analysis was conducted using thematic analysis (Braun & Clarke, 2006) with source triangulation. Results show that both stakeholder groups acknowledge the relative advantage of roller barriers over conventional guardrails, but significant barriers exist: high installation costs (IDR 17,000,000/meter), non-compliance with the minimum 40% Local Content Level (TKDN) requirement, limited vehicle crash test facilities in Indonesia, and regional budget constraints. Triangulation findings identified a perception gap between Dishub as policy users and distributors as market actors, particularly regarding regulatory readiness and procurement ecosystems. This study recommends accelerating national standardization, developing domestic production, and establishing adaptive financing schemes to promote wider adoption of roller barriers.

Simulasi Numerik Aeroelastik Model Seksional 2D Jembatan Bentang Panjang untuk Mengetahui Karakteristik Ketidakstabilan Flutter sulistiya sulistiya; Mochammad Agoes Moelyadi; Muhammad Kusni; Mahesa Akbar
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 1 (2024)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/vol%viss%ipp%p

Flutter merupakan peristiwa ketidakstabilan aerodinamik pada jembatan bentang panjang yang dapat mengakibatkan kerusakan secara menyeluruh struktur dek jembatan. Interaksi antara angin dan struktur pada jembatan bentang panjang dapat diinvestigasi dengan simulasi numerik. Pada penelitian ini dilakukan simulasi aeroelastik pada model seksional 2D dek jembatan bentang panjang dengan teknik getaran bebas untuk menganalisis kecepatan flutter dan mengetahui pengaruh bentuk dek terhadap karakteristik ketidakstabilan flutter menggunakan perangkat lunak ANSYS. Data hasil simulasi kemudian diekstraksi menggunakan metode identifikasi Modified Ibrahim Time-Domain Method (MITD) untuk mendapatkan nilai rasio redaman dan koefisien flutter derivatives. Nilai rasio redaman digunakan untuk menentukan kecepatan kritis flutter, sedangkan koefisien flutter derivatives digunakan untuk mengetahui karakteristik ketidakstabilan flutter dan mekanisme flutter yang terjadi pada jembatan. Hasil penelitian menunjukkan bahwa bentuk penampang persegi panjang (bluff body) lebih rentan terhadap ketidakstabilan flutter dibandingkan dengan bentuk streamline, serta memiliki nilai kecepatan flutter yang lebih rendah dari bentuk yang lain. Mekanisme flutter yang terjadi adalah torsional flutter, sedangkan pada bentuk streamline adalah coupling flutter.

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