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All Journal Rekayasa Mesin Machine : Jurnal Teknik Mesin Jurnal Rekayasa Hijau Jurnal Rekayasa Energi dan Mekanika METAL : Jurnal Sistem Mekanik dan Termal Aceh International Journal of Science and Technology
Alfan Ekajati Latief
Institut Teknologi Nasional Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Optimasi Dimensi Connecting Rod Al2024 dan Tulangan Baja 4340 pada Kawasaki Ninja 150 R Menggunakan ANSYS Alfan Ekajati Latief; Nuha Desi Anggraeni
Rekayasa Hijau : Jurnal Teknologi Ramah Lingkungan Vol 3, No 1 (2019)
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/jrh.v3i1.2867

Abstract

ABSTRAKConnecting rod berfungsi menghubungkan piston ke crankshaft, sistem ini membentuk mekanisme sederhana yang mengubah gerak lurus menjadi gerak melingkar ataupun sebaliknya. Umumnya connecting rod dirancang berbenruk I agar kuat dan ringan dengan material baja. Pengurangan massa pada connecting rod dapat mengurangi momen inersia engine, meningkatkan performa dan fuel efficiency engine. Penelitian ini bertujuan untuk mendapatkan dimensi optimum connecting road menggunakan material Al 2024 dan tulangan baja 4340.Dimensi optimum harus dapat menahan tegangan dan regangan maksimum yang terjadi pada connecting rod ketika menerima beban tekan dan tarik. Penelitian dilakukan dengan melakukan varisi dimensi profil I dan bentuk tulangan dengan dimensi lain menyesuaikan spesifikasi connecting rod Kawasaki Ninja 150 R. Hasil penelitian memperlihatkan bahwa connecting rod dengan profil I, bentuk tulangan webbing merupakan tulangan paling optimal dengan ketebalan 8 mm dengan berat total 0,12 Kg.Kata kunci: connecting rod, tulangan baja, Al2024, ANSYSABSTRACTThe connecting rod serves to connect the piston to the crankshaft; this system forms a simple mechanism that converts straight motion into circular motion or vice versa. Generally, connecting rods are designed to be made in order to be strong and lightweight with steel material. Reducing the mass of the connecting rod can reduce the moment of engine inertia, improve the performance and fuel efficiency engine. This study aims to obtain the optimum dimensions of the connecting road using Al 2024 material and steel reinforcement 4340. The optimum dimension must be able to withstand the maximum stress and strain that occurs in the connecting rod when receiving compressive and tensile loads. The study was conducted by varying the dimensions of profile I and shape of reinforcement with other dimensions adjusting the specifications of the connecting rod Kawasaki Ninja 150 R. The results showed that the connecting rod with profile I, the form of webbing reinforcement was the most optimal reinforcement with a thickness of 8 mm and total mass 0,12 kg.Keywords: connecting rod, reinforcement steel, Al2024, ANSYS.
Pembuatan dan Pengujian Karakteristik Pisau Sangkur Menggunakan Metoda Tempa Lipat Twisting Alfan Ekajati Latief; Tri Sigit Purwanto; Pikri Ilham Jauhari; M. Diaz Fajar Ismail
Jurnal Rekayasa Energi dan Mekanika Vol 2, No 2 (2022): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v2i2.139

Abstract

ABSTRAK Pisau sangkur/bayonet pertama kali dibuat di negara Francis di kota Bayonne pada abad ke 17. Kegunaan dari pisau tersebut dapat diletakkan di ujung senapan untuk pertempuran jarak dekat.Material yang dipilih untuk pembuatan pisau sangkur yaitu baja C45 dan baja komersil. Untuk proses pembuatan baja C45 ditumpuk dengan baja komersil lalu di tempa lipat dan dilakukan proses puntir (twisting) agar mendapatkan struktur mikro yang khas dengan keseragaman padatan pada semua bidang yang ditempa, hal tersebut dilakukan sebanyak 3x lipatan hingga mencapai 27 lapisan, dilipat kembali sebanyak 3x lipatan sehingga hasil akhinya didapat 81 lapisan.Penelitian ini bertujuan untuk membuat pisau sangkur dengan karakteristik menyerupai pedang damascus, hasil dari pengujian kekerasan setelah dirata-ratakan didapat 18 HRC, untuk pengujian metalografi didapat fasa ferit dan perlit, dan pada pengujian fungsi berupa menyayat memotong menebas dan menusuk kondisi pisau sangkur masih dalam kondisi baik. Kata kunci : Pisau Sangkur, Twisting, Tempa Lipat, C45, Uji kekerasan, Uji metalografi. ABSTRACT Sangkur knife/bayonet knife was first made in the franciscan state of the city of Bayonne in the 17th century. The usefulness of such a knife can be put on the tip of a rifle for close combat. The materials chosen for the manufacture of the knife are C45 steel and commercial steel. For the C45 steelmaking process, it is stacked with commercial steel and then forged and a twisting process is carried out in order to get a distinctive microstructure with uniformity of solids on all forged fields, this is done as many as 3x folds until it reaches 27 layers, folded back as many as 3x folds so that the results are obtained 81 layers.  This study aims to make a cage knife with characteristics resembling a Damascus sword, the results of hardness testing after being averaged obtained 18 HRC, for metallographic testing obtained ferrite and perlite phases, and in testing functions in the form of wrenching, cutting, slashing and piercing the condition of the knife is still in good condition.  Key words : Bayonet Knife, Twisting, Folding Forge, C45, Hardness test, Metallographic test.
Manufacture of Composite Plastic Pellet Seed Machine Capacity 2.5 Kg/Hour Alfan Ekajati Latief; Cahyadi Suheri
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.34-39.2023

Abstract

Natural fibers are a material that is easily obtained from nature, both animals and plants. Using natural fibers has been commercially applied in various fields, such as automotive and construction, by mixing PPHI (Polypropylene High Impact) with injection molding and forming plastic pellets. Pellets are extruded with natural pineapple fiber for composite, which requires a composite pellet-making machine, which combines two materials that are not aligned with the material mixing method using a screw inside the barrel, then heated by a heater. The screw pushes the pellets that have been mixed and melted to the die and then dried with water, which will go to the Crusher to be chopped into composite pellet seeds. In this research, a plastic extruder machine with a capacity of 2.5 Kg/hour components used a single screw, heater, die, Crusher, barrel, and hopper, and the time delay in this study is 165º and 180º. The screw rotation is constant at 15 rpm, using a screw diameter of 20 mm x 550 mm and a pitch distance of 1D with an inclination angle of 23º.
Aplikasi Dan Pengaruh Sistem Turbocharger Berkapasitas 100cc – 200cc Pada Performa Mesin Yamaha V-Ixion Tri Sigit Purwanto; Alfan Ekajati Latief; Muhammad Azis Mahardhika; Kurnia Hendriawan; Jaka Rahmadi
Jurnal Rekayasa Energi dan Mekanika Vol 3, No 1 (2023): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v3i1.54

Abstract

ABSTRAK Dunia otomotif di Indonesia semakin berkembang dengan pesat, jenis-jenis motor baru dari berbagai pabrikan bermunculan dengan pesat. Salah satu jenis motor yang berteknologi cukup baik adalah YAMAHA V-IXION. Tipe motor ini memiliki teknologi dasar mobil yaitu injector bahan bakar dan ECU (Electronic Controller Unit) sebagai penerapan engine mapping. Untuk menambah tenaga motor, dilakukan pemasangan turbocharger. Tujuan penelitian ini adalah meningkatkan performa mesin dengan kapasitas 150 cc dengan memanfaatkan boost dari turbocharger dengan tekanan minimal 0,3 bar. Performa mesin diukur dengan menggunakan dyno test. Setelah sistem turbocharger diaplikasikan ke mesin YAMAHA V-IXION dapat bekerja secara normal dan mampu mencapai boost hingga 0,5 bar. Hasil pengujian dyno test diperoleh: Peak daya terjadi pada 8,622 rpm dengan daya sebesar 14,7 HP, peak torsi terjadi pada 8,547 rpm dengan torsi sebesar 12,21 Nm2, dan konsumsi bahan bakar yang dipergunakan adalah 2,63 liter dengan jarak tempuh 94,6 Km. Kata kunci : V-IXION, turbocharger, dyno test ABSTRACT The automotive in Indonesia is growing rapidly, new types of motorcycle from various manufacturers have emerged rapidly. One type of motorcycle with good technology is the YAMAHA V-IXION. This type of motorcycle has basic car engine technology, namely fuel injectors and ECU (Electronic Controller Unit) as engine mapping application. To increase power, it is necessary to install a turbocharger so that motorcycle power generated can increase. The goal of this research is increase the machine performance with capacity of 150 cc by using boost from turbocharger that operate at least 0.3 bar. Machine performance was tested by using dyno test rig. After the turbocharger system is applied to the YAMAHA V-IXION engine it can work normally and is able to achieve a boost of up to 0.5 bar. The dyno test result: Peak power occurs at 8.622 rpm with a power of 14.7 HP, peak torque occurs at 8.547 rpm with torque of 12.21 Nm2, and fuel consumption used is 2.63 liters with a distance of 94.6 km.  Key words: V-IXION, turbocharger, dyno test. 
Analisa Karakterisasi Material Produk Slide Piece CVT Berbahan Komposit Berpenguat Serat Nanas dengan Fraksi Volume 10% Ahmad Dzilfairuz Zaidan; Alfan Ekajati Latief; Nuha Desi Anggraeni
Jurnal Rekayasa Energi dan Mekanika Vol 3, No 1 (2023): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v3i1.77

Abstract

Abstrak   Slide piece merupakan salah satu komponen penting pada sepeda motor. Tujuan penelitian ini adalah melakukan karakterisasi material pada produk slide piece CVT berbahan komposit dengan polypropylene high impact (PPHI) sebagai pengikat dan serat alam berfraksi volume 10% sebagai bahan penguat. Metode karaktertisasi yang dilakukan menggunakan pegujian komposisi kimia, pengujian kekerasa, pengujian keausan, dan analisa struktur mikro. Slide piece yang dikarakterisasi adalah slide piece original, imitasi dan komposit. Hasil pengujian komposisi kimia, memperlihatkan bahwa slide piece imitasi tidak memiliki bahan ethylene. Berdasarkan hasil pengujian kekerasan, slide piece komposit memiliki nilai 112 HRB atau 84% menyerupai slide piece original. Hasil pengujian keausan pada slide piece komposit, nilainya adalah 7.54 x 10-6 (g/mm2.detik), 1,5 kali lebih besar dari slide piece original, namun 0,75 kali lebih kecil dari slide piece imitasi. Sehingga dapat disimpulkan bahwa slide piece berbahan komposit tersebut nilai kekerasan dan kausannya lebih baik daripada slide piece imitasi.Kata kunci: sifat mekanik, otomotif, material, komposisi.  Abstract The slide piece is one of the essential components of a motorcycle. This study aimed to characterize the material on CVT slide piece products made from composites with high-impact polypropylene (PPHI) as a binder and natural fibre with a volume fraction of 10% as a reinforcing material. The characterization method was carried out using chemical composition testing, hardness testing, wear testing, and microstructural analysis. The slide pieces that are characterized are original, imitation and composite slide pieces. The results of the chemical composition test show that the imitation slide piece does not contain ethylene. Based on the hardness test results, the composite slide piece has a value of 112 HRB or 84% resembling the original slide piece. The wear test results on the composite slide piece are 7.54 x 10-6 (g/mm2.second), 1.5 times larger than the original slide piece but 0.75 times smaller than the imitation slide piece. So it can be concluded that the slide piece made from composite has a better hardness and wear value than the imitation slide piece.Keywords: mechanical properties, automotive, materials, composition.
PERANCANGAN CETAKAN INJECTION MOLDING HANDPRESS MATERIAL KOMPOSIT PPHI DAN SERAT ALAM Alfan Ekajati Latief; Nuha Desi Anggraeni; Ichsan Putera
Machine : Jurnal Teknik Mesin Vol 8 No 2 (2022): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v8i2.2554

Abstract

Injection molding is a method of forming a thermoplastic that is heated until it melts and then injected with high pressure into the mold so that the thermoplastic material will harden in the mold. The type of injection molding used is the hand press type with a pressure capacity of 34.83 MPa and a barrel capacity of 273 cm3. The mold that will be designed is to make a tensile test specimen ASTM 3039, an Impact test specimen ASTM D 6110-04, and a bending test specimen ASTM D 695. Determination of the specimen pointing to the type of material used is a composite with a high impact polypropylene matrix (PPHI) and natural fibers of Ramie and pineapple leaves. The mold design will initially make 2 mold designs based on the flow of material entering the mold, with the material being tested is 100% PPHI. After getting the optimal one, the composite will test the optimal mold with different types of PPHI composite material and 10% different volume fractions of natural fiber. Namely, pineapple and Ramie fibers with the parameters used as references are fill of time, Pressure at end fill, and Temperature at end fill. In this study, it can be concluded that of the three specimens above, the pineapple leaf fiber has high pressure and temperature at the end fill compared to Ramie fiber.Abstrak ditulis dalam Bahasa Inggris, satu paragraf, memuat tujuan, metode penelitian yang digunakan dan hasil.
DESIGN OF NATURAL FIBER POWDER MACHINE Latief, Alfan Ekajati; Ali, Ali; Nassem, Zidane; Ramadan, Riski Gunarto
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1482

Abstract

Natural fiber processing is the type of fiber as raw materials for textile or other industries that can be obtained directly from nature. In the Indonesian automotive industry, the manufacture of parts in vehicles is Polypropylene high impact (PPHI). An example of an existing part is a CVT slide piece made with a mixed polymer composite material from PPHI and pineapple leaf fiber. Pineapple leaf fibers with small sizes are needed so that the mixing of polymer composites is good. Therefore modern technology is required to process pineapple leaf fibers. This final project makes a natural fiber powder machine for processing natural fiber, namely scavenging. The research methodology used is a prescriptive design method. The design results produce a natural fiber powder machine (pineapple leaf fiber) for polymer composite materials with long size specifications of 420 mm long, 300 mm wide, and 582 mm high. The production capacity of the natural fiber storage machine is 5 kg/h. The source of the engine drive is a 1 HP AC electric motor with a rev of 2800 rpm. The transmission system uses a V-belt with a drive shaft 30 mm in diameter. The frame construction is made of a 35x35x5 mm profile with ST42 material and knives using S45C material (AISI 1045) with a thickness of 10 mm. It uses nine dynamic blades and six sharp plane fixed blades in a 30-degree active blade and a 60-degree fixed blade.
Perancangan Modifikasi Mesin Powder Serat Daun Nanas Kapasitas 5,54 Kg/Jam Latief, Alfan Ekajati; Hidayat, Fery; Sirodz, Muhammad Pramuda; Pratama, M. Rezki
Jurnal Rekayasa Energi dan Mekanika Vol 5, No 1 (2025): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v5i1.74

Abstract

Slide piece CVT adalah komponen kendaraan berbahan komposit polimer campuran dari PPHI dan serat daun nanas. Penelitian ini membuat mesin powder serat alam untuk proses penepungan dengan metode perancangan preskriptif. Hasil perancangan menghasilkan mesin pemisah serbuk serat alam (serat daun nanas) untuk bahan komposit polimer dengan spesifikasi ukuran panjang 420 mm, lebar 300 mm, dan tinggi 582 mm. Kapasitas produksi mesin penepung serat alam 5 kg/jam. Mesin berpenggerak motor listrik AC 1 Hp, putaran 2800 rpm. Sistem transmisi V-belt dengan poros penggerak 30 mm. Kontruksi rangka terbuat dari profil 35x35x5 mm berbahan ST42 dan pisau berbahan S45C (AISI 1045) dengan ketebalan 10 mm. Menggunakan 9 mata pisau dinamis dan 6 mata pica statis bidang tajam dalam mata pisau dinamis 30o dan mata pisau statis 60o. Lalu Powder disaring menggunakan Cyclone collector dengan mesh 120 dan Vibration Screen dengan Mesh 120, 170, dan 200. Hasil analis dan simulasi dengan menggunakan perangkat lunak CAD terhadap Rancangan Mesin Powder Serat Daun Nanas mendapatkan nilai tegangan maksimum sebesar 2,88 MPa, defleksi maksimum 0,00035 mm dan Safety Factor (SF) 100 dari komponen Poros dan komponen Pegas memiliki nilai tegangan maksimum sebesar 1,5 MPa, defleksi maksimum 10,57 mm dan Safety Factor (SF) 1,45 serta Pressure Drop yang terjadi pada pipa cyclone sebesar 7,75 MPa untuk  dengan kecepatan pengumpanan 58,13 m/s
Characterization of Natural Fiber Reinforced Resin Composites and Glass Waste Powder for Brake Linings Fitri*, Muhamad; Sudarma, Andi Firdaus; Latief, Alfan Ekajati; Hamid, Abdul; Azis, Iqbal Lutfil; Surya Jati, Stenlly Damar
Aceh International Journal of Science and Technology Vol 14, No 1 (2025): April 2025
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.14.1.42585

Abstract

Currently, there are two types of brake linings in the market: asbestos brake lining and asbestos-free brake linings. The asbestos Brake lining was widely used due to durability, heat resistance and friction properties. In terms of price, asbestos brake linings are indeed cheaper than asbestos-free brake linings, However, they have negative impact on the environment and human health. In high enough concentrations, asbestos dust can cause Mesothelioma, a malignant tumor in the lining of the lungs). Therefore, it is necessary to find a substitute material for asbestos that is affordable but possesses similar characteristics to asbestos brake linings. While, the high production of salak in Indonesia has a side effect, i.e.: the large volume of waste in the form of peel and seeds of salak. If not utilized, of course this will become waste. Meanwhile, glass waste is an inorganic waste material that is very difficult to decompose and pollutes the environment. Meanwhile, glass waste is one of the inorganic waste materials that is very difficult to decompose and pollutes the environment. The aim of this study was to characterize composite resin materials reinforced with glass waste powder, Snake Fruit Peel Powder and teak wood sawdust as alternative brake lining materialsThe research was conducted through laboratory experiments, beginning with the manufacture of sample specimens, followed by measuring their density, hardness, and friction coefficient testing then compared to brake lining on the market and also based on the SNI 09-0143-1987 standard. The result showed, some of the investigated samples in this study meet the reqirement of SNI 09-143-1987, where the lowest Brinell Hardness number of the sample 120.33. There are 5 specimens of friction coefficient of the specimens are also fullfill the requirement.
Rancang Bangun Resevoir Pendingin Menggunakan Chiller dan Pengujian Pada Hasil Pemotongan Plastic Composite Kapasitas 5 kg/jam Latief, Alfan Ekajati; Sirodz, Muhamad Pramuda; Febriyanto, Naufal Dwi; Akbar, Sobari; Pratama, Muhammad Rezki
Jurnal Rekayasa Energi dan Mekanika Vol 3, No 2 (2023): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v3i2.146

Abstract

ABSTRAK Untuk memperoleh bentuk pellet composite tersebut diperlukan proses pendinginan, material komposit dari mesin extruder sebelum dilakukan pemotongan. Proses pendinginan material komposit mempengaruhi proses pemotongan menjadi bentuk pellet, oleh karena itu pada penelitian ditentukan resevoir pendingin yang digunakan agar suhu air yang ada didalam reservoir tetap stabil. Metode penelitian ini berupa rancang bangun sebagai reservoir pendinginan menggunakan chiller dan menguji pemotongan plastic composite. Hasil perancangan di peroleh resevoir dengan dimensi 150 cm x 20 cm x 30 cm dan mesin pendingin dengan kapasitas 1 Pk. Tempratur material di mesin extruder sebesar 195 C didinginkan oleh air dengan tempratur 10 C dan 27 C, sehingga material plastic composite menjadi kaku akibat pendinginan cepat. Hasil uji keras bahwa material komposit yang telah didinginkan dengan tempratur 10 C memiliki kekerasan rata – rata 11,82 VHN. Dimana kekerasan material ini lebih keras di bandingkan pada suhu 27 C yang sebesar 7,82 VHN. Produk hasil pendinginan, kemudian dipotong menjadi bentuk pellet dengan ukuran mesh 4, hasil pemotongan di peroleh kapasitas pemotongan 4,30 kg selama 60 menit dengan hasil pemotongan yang seragam sebanyak 90%.  Kata Kunci : Water Chiller, PPHI , Serat nanas, mesin pemotong  ABSTRACT To obtained the composite pellet form is required cooling process, composite material from extruder machine before cutting. The cooling process of the composite material affects the cutting process into pellet form, therefore the research determined the cooling reservoir used so that the water temperature in the reservoir remains stable. This research method is in the form of design as a cooling reservoir using a chiller and testing the cutting of plastic composite. The results of the design obtained a reservoir with dimensions of 150 cm x 20 cm x 30 cm and a cooling machine with a capacity of 1 Pk. The material temperature in the extruder machine is 195 C cooled by water with a temperature of 10 C and 27 C, so that the plastic composite material becomes stiff due to rapid cooling. The results of the hard test that the composite material that has been cooled with a temperature of 10 C has an average hardness of 11.82 VHN. Where the hardness of this material is harder than at 27 C which amounted to 7.82 VHN. The result of the cooling, then cut into a pellet size of mesh 4. And the result of cutting obtained a cutting capacity of 4,3  kg for 60 minutes with a uniform cutting result of 90%. Keywords: water chiller, PPHI, Fiber Nanas, Cutting Machine.
Co-Authors Abdul Hamid Ahmad Dzilfairuz Zaidan Ahmad Dzilfairuz Zaidan Akbar, Sobari Ali Ali Alvin Rhamdani Anggraeni, Nuha Desi Azis, Iqbal Lutfil Cahyadi Suheri Dedy Hernady Febriyanto, Naufal Dwi Fitri*, Muhamad Hernady, Dedy Hidayat, Ery Ichsan Putera Irfan, Laode Mochamad Jaka Rahmadi Kurnia Hendriawan Lutfi Darusman M. Diaz Fajar Ismail Muhammad Azis Mahardhika Muhammad Khaidar Rachman Nassem, Zidane Naufal Raihan M Nuha Desi Anggraeni Pikri Ilham Jauhari Pratama, M. Rezki Pratama, Muhammad Rezki Prianto, Ramdan Rakean Wide Windujati Ramadan, Riski Gunarto Robby Rinaldi Sandi S., Adimas Prasetyo S., M. Pramuda Nugraha Sarmada, Sarmada Satria Budhi Dharma Sirodz, Muhamad Pramuda Sirodz, Muhammad Pramuda Sudarma, Andi Firdaus Surya Jati, Stenlly Damar Syahril Sayuti Tri Sigit Purwanto Wibowo Pria Fahla Wildhan Rhamdani