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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Warta Ardhia : Jurnal Perhubungan Udara International Journal of Aviation Science and Engineering
Akbar, Mahesa
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Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Mechanical Engineering Transportation

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i1.52401

Abstract

Flutter is an aerodynamic instability on a long span bridge that can cause damage to the entire bridge deck structure. The interaction between wind and structure in long span bridges can be investigated by numerical simulation. In this study, an aeroelastic simulation was performed on a 2 DoFs sectional model of a long-span bridge deck with free vibration techniques to analyze flutter speed and determine the effect of deck shape on flutter instability characteristics using ANSYS software. The simulation result data was then extracted using the Modified Ibrahim Time-Domain Method (MITD) identification method to obtain the damping ratio and flutter derivatives coefficients. The damping ratio value is used to determine the critical flutter speed, whereas the coefficient flutter derivatives is used to determine the characteristics of flutter instability and the flutter mechanism that occurs in the bridge. The results showed that the rectangular shape (bluff body) is more susceptible to flutter instability than the streamlined shape, and has a lower flutter speed value than the other shapes. The flutter mechanism that occurs is torsional flutter, whereas in the streamline body is coupling flutter.
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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Abstract

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

Abstract

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.
Co-Authors Adhy Sasongko, Rianto Agung, Rizqy Eko Poetro, Ridanto Jenie, ST.,MT., Dr. Ir. Yazdi Ibrahim Kusni, Muhammad Leonardo Gunawan, Leonardo Liuswanto, Chandra Moelyadi, Mochammad Agoes Sulistiya, Sulistiya Widadi, Novyanto