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Kajian Komputasi Pengaruh Penerapan Blowing pada Bagian Belakang Model Kendaraan Rustan Tarakka; Nasaruddin Salam; Andi Amijoyo Mochtar; Muhammad Ihsan; Wawan Rauf
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13478

Abstract

Drag aerodinamika pada kendaraan disebabkan adanya tekanan rendah dan separasi aliran di bagian belakang, yang berdampak pada menurunnya kecepatan, meningkatnya penggunaan bahan bakar, dan turunnya efisiensi kendaraan. Blowing merupakan salah satu pilihan rekayasa kendali aktif aliran yang dapat diterapkan pada desain kendaraan yang dapat mengendalikan pembentukan separasi aliran dan berefek positif berupa pengurangan hambatan aerodinamis. Penelitian ini bertujuan menganalisis pengaruh penerapan blowing terhadap pola aliran, distribusi tekanan, dan hambatan aerodinamika yang bekerja pada bagian belakang model. Dengan bantuan CFD Fluent 6.3, model uji yang digunakan adalah model kendaraan dengan sudut kemiringan geometri depan (α) 35o dan rasio terhadap model Ahmed bodi original adalah 0.17 (1:6), yang dilengkapi dengan blowing dengan kecepatan 1.0 m/s. Hasil komputasi mengindikasikan bahwa penerapan blowing dapat mengurangi pembentukan wake dan menunda separasi aliran dan dapat meningkatkan koefisien tekanan minimum pada bagian belakang model kendaraan sebesar 24.690%. Pengurangan hambatan aerodinamika diperoleh sebesar 9.583%.
Analisis Karakteristik Aliran Fluida Melewati Model Sayap Pesawat Swayasa Nasaruddin Salam; Rustan Tarakka; Jalaluddin Jalaluddin; Sarwan Sarwan
JMPM (Jurnal Material dan Proses Manufaktur) Vol 5, No 2 (2021): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v5i2.13902

Abstract

Pesawat swayasa adalah pesawat eksperimental, di mana setidaknya 51% dari suku cadang pesawat dibuat oleh amatir dan tidak diproduksi di pabrik. Untuk itu tema penelitian ini adalah menentukan model sayap pesawat swayasa. Rumusan masalah dalam penelitian ini adalah bagaimana karakteristik model sayap pesawat swayasa, berapakah koefisien lift (Cl) dan koefisien drag (Cd), dan bagaimana model sayap yang optimal dari pesawat swayasa. Tujuan dari penelitian ini adalah untuk menjawab permasalahan yang disebutkan di atas. Metode penelitian ini menggunakan pendekatan Computational Fluid Dynamics (CFD) dan program eksperimen. Pendekatan eksperimental dilakukan di terowongan angin di Laboratorium Mekanika Fluida, Fakultas Teknik Universitas Hasanuddin, Gowa. Model sayap pesawat independen adalah model airfoil NACA 23012, dengan memodifikasi rasio ketebalan terhadap chord (t/c) pada t/c = 9%, t/c = 12%, dan t/c = 15%. Selanjutnya masing-masing model diberi perlakuan kecepatan aliran bebas (U) sebesar 40 m/s, dengan variasi angle of attack (α) -20˚, -15˚, -10˚, -5˚, 0˚, 5˚ , 10˚, 15 , dan 20. Hasil penelitian menunjukkan bahwa penambahan t/c ratio meningkatkan nilai Cl maksimum. Untuk nilai maksimum Cl diperoleh pada = 150 yaitu pada t/c = 9%, Cl = 1,4299, pada t/c = 12%, Cl = 1,4466, dan pada t/c = 15 %, Cl = 1,4979 . Cl/Cd maksimum sebesar 1,4999 diperoleh pada t/c = 15 % dan = 5˚, dengan demikian model sayap pesawat swayasa yang paling sesuai adalah model airfoil NACA 23012 dengan t/c = 15 %.Homebuilt aircraft are experimental aircraft, of which at least 51% of the aircraft parts are amateur-built and not manufactured in factory. For this reason, the theme of this research is to determine the wing model of a homebuilt aircraft. The formulation of the problem in this study is how the characteristics of wing model of  a homebuilt aircraft, how much is the lift coefficient (Cl) and drag coefficient (Cd), and what is the optimal model of the wing of a homebuilt aircraft. The purpose of this research is to answer the problems mentioned above. This research method uses Computational Fluid Dynamics (CFD) and experimental program approach. The experimental approach was carried out in a wind tunnel at the Fluid Mechanics Laboratory, Faculty of Engineering, Hasanuddin University, Gowa. The wing model of the independent aircraft is the NACA 23012 airfoil model, by modifying the thickness to chord ratio (t/c) at t/c = 9 %, t/c = 12 %, and t/c = 15 %. Furthermore, each model was treated with a freestream velocity (U) of 40 m/s, with variations in the angle of attack (α) -20˚, -15˚, -10˚, -5˚, 0˚, 5˚, 10˚, 15˚ , and 20˚. The results showed that the addition of the t/c ratio increased the maximum Cl value. For the maximum value of Cl obtained at = 150, namely at t/c = 9%, Cl = 1.4299, at t/c = 12 %, Cl = 1.4466, and at t/c = 15 %, Cl = 1 ,4979. The maximum Cl/Cd is of 1.4999 obtained at  t/c = 15 % and α = 5˚, thus the most suitable homebuilt aircraft wing model is the NACA 23012 airfoil model with t/c = 15 %.
Kajian Aerodinamika Pada Model Kendaraan dengan Penerapan Kontrol Aktif Suction Rustan Tarakka; Nasaruddin Salam; Jalaluddin Jalaluddin; Wawan Rauf; Muhammad Ihsan
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 1 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (673.3 KB) | DOI: 10.25077/metal.5.1.38-43.2021

Abstract

As the air flow reaches the rear part of the vehicle the flow will undergo separation generated by friction and fluid viscosity, and creating wake, considerably large turbulent area with low pressure at the rear of the vehicle which results in pressure drag which can reduce vehicle performance. The research was carried out with a computational and experimental approach. The test model used in this study is a model of a family van model which is a modification of the Ahmed body model. The rear part of the vehicle model is equipped with an active control feature in the form of a suction with a slant angle (α) of 35°. The upstream speed and suction speed are 11.1 m/s and 0.5 m/s, respectively. The results obtained indicate that the application of active suction control is able to reduce wake formation and delay flow separation compared to the uncontrolled model, and is able to increase the minimum pressure coefficient on the rear wall of the vehicle model with an increase of 41.49%, and is able to reduce the drag coefficient by 11.0260% for the approach. computation and 11.0080% for the experimental approach.
Welenrengnge Model: Formation of National Character Among Students of SMK Negeri 6 Pangkep Regency, South Sulawesi A B. Takko Bandung; St. Nursaadah; Nasaruddin Salam
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 7 No. 3 (2023): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v7i3.14737

Abstract

The erosion of national character among young generations nowadays, including the students of SMK Negeri 6 Pangkep, highlights the importance of national character strengthening training. This training focuses on strengthening MARITIME character (manly, wise, religiously innovative, tough, integrity, independent) for SMKN 6 Pangkep using the Welenrengnge Model. The method used in this training includes closing reading of training materials, lectures/presentations, in-depth discussions on MARITIME character, each participant making discussion reports, field practices, and tutorials. Field practices are conducted with a number of games to train the practice of MARITIME character. The tutorial method is used for consultation and to strengthen understanding and application of MARITIME character. The results of the training show that students realize the importance of this activity to increase knowledge, insight, national consciousness, and to stimulate creativity and innovation through games. Practice through games can build wisdom, independence, toughness, and humanity. Another important aspect is the creation of a religious atmosphere.