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All Journal Jurnal Pendidikan Teknologi dan Kejuruan INVOTEK: Jurnal Inovasi Vokasional dan Teknologi JPP IPTEK (Jurnal Pengabdian dan Penerapan IPTEK) JURNAL PENDIDIKAN TAMBUSAI JOURNAL OF SCIENCE AND SOCIAL RESEARCH Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Didaktik : Jurnal Ilmiah PGSD STKIP Subang Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Vocational : Jurnal Inovasi Pendidikan Kejuruan Automotive Experiences Jurnal Vokasi Mekanika MASALIQ: Jurnal Pendidikan dan Sains Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Engineering Researcher and Lecturer Asian Journal of Science, Technology, Engineering, and Art
Putra, Randi Purnama
Universitas Negeri Padang
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ANALISIS KINERJA TURBIN AIR VERTIKAL TIPE S-SHAPE PADA SALURAN MELENGKUNG MENGGUNAKAN COMPUTATIONAL FLUID DYNAMICS (CFD) Asadellah, Dimas Pandhu; Qalbina, Fitrah; Fernanda, Yolli; Putra, Randi Purnama
JOURNAL OF SCIENCE AND SOCIAL RESEARCH Vol 9, No 1 (2026): February 2026
Publisher : Smart Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54314/jssr.v9i1.5793

Abstract

Abstract: The s-shaped turbine is a hydrokinetic turbine that has the potential to be applied to open channel flows due to its ability to operate at low flow velocities and its simple construction. However, the performance of this turbine is greatly influenced by the surrounding hydrodynamic conditions, including the geometry of the flow domain. This study aims to analyze the effect of variations in the open channel domain angle on the flow characteristics and performance of the s-shaped Savonius turbine using a Computational Fluid Dynamics (CFD) approach. Simulations were carried out at three variations of domain angles, namely 20°, 30°, and 40°, with an inlet flow velocity of 0.5 m/s, a turbine diameter of 76 mm, and a turbine height of 76 mm. The performance parameters analyzed included torque, power coefficient (Cp), and torque coefficient (Ct), as well as flow characteristics in the form of velocity contours, pressure contours, and streamlines. The simulation results show that variations in the domain angle have a significant effect on the flow distribution, pressure pattern, and torque stability produced by the turbine. The domain with an angle of 20° produces the highest Cp and Ct values, while the 30° domain shows a significant decrease in performance due to the increase in the recirculation zone and pressure imbalance around the rotor. Keyword: S-Shape Turbine; Hydrokinetics; Open Channel; CFD; Domain Angle Abstrak: Turbin tipe s-shape merupakan salah satu turbin hidrokinetik yang potensial untuk diaplikasikan pada aliran saluran terbuka karena kemampuannya beroperasi pada kecepatan aliran rendah dan konstruksinya yang sederhana. Namun, kinerja turbin ini sangat dipengaruhi oleh kondisi hidrodinamika di sekitarnya, termasuk geometri domain aliran. Penelitian ini bertujuan untuk menganalisis pengaruh variasi sudut domain saluran terbuka terhadap karakteristik aliran dan performa turbin s-shape menggunakan pendekatan Computational Fluid Dynamics (CFD). Simulasi dilakukan pada tiga variasi sudut domain, yaitu 20°, 30°, dan 40°, dengan kecepatan aliran masuk 0,5 m/s, diameter turbin 76 mm, dan tinggi turbin 76 mm. Parameter kinerja yang dianalisis meliputi torsi, koefisien daya (Cp), dan koefisien torsi (Ct), serta karakteristik aliran berupa kontur kecepatan, kontur tekanan, dan streamline. Hasil simulasi menunjukkan bahwa variasi sudut domain memberikan pengaruh signifikan terhadap distribusi aliran, pola tekanan, dan stabilitas torsi yang dihasilkan turbin. Domain dengan sudut 20° menghasilkan nilai Cp dan Ct tertinggi, sedangkan domain 30° menunjukkan penurunan kinerja yang cukup signifikan akibat meningkatnya zona resirkulasi dan ketidakseimbangan tekanan di sekitar rotor. Kata kunci: Turbin S-Shape; Hidrokinetik; Saluran Terbuka; CFD; Sudut Domain
ANALISIS PENGARUH VARIASI JUMLAH SUDU TERHADAP KINERJA TURBIN CROSSFLOW DI PT XYZ Farhan Rahmat Putra; Andre Kurniawan; Yolli Fernanda; Randi Purnama Putra
Didaktik : Jurnal Ilmiah PGSD STKIP Subang Vol. 11 No. 04 (2025): Volume 11 No. 04 Desember 2025 In Press
Publisher : STKIP Subang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36989/didaktik.v11i04.8777

Abstract

This study aims to analyze the effect of blade number variation on the performance of a crossflow turbine used in the Micro-Hydro Power Plant (PLTMH) system at PT XYZ. The research was conducted using a numerical simulation approach based on Computational Fluid Dynamics (CFD) with Solidworks 2022 for geometry modeling and ANSYS Fluent 2025 R1 for fluid flow simulation. The variations of blade numbers investigated were 18, 24, 30, and 32 blades, with constant operating parameters including a flow rate of 0.03678 m³/s, a head of 0.3 m, and a rotational speed of 1500 rpm. The simulation results indicate that the number of blades significantly affects the torque, output power, and efficiency of the crossflow turbine. The configuration with 18 blades produced the best performance, achieving a torque of 21.39 Nm, an effective power of 3359.64 W, and an efficiency of 31.09%, while configurations with 24 and 32 blades showed a significant decrease in efficiency to around 6%. The analysis of velocity contours, pressure contours, and streamlines revealed that the 18-blade configuration provides a more stable and focused flow with uniform pressure distribution along the blade’s leading edge, resulting in greater tangential force on the runner shaft. In contrast, increasing the number of blades causes higher turbulence and energy losses. Therefore, it can be concluded that the 18-blade configuration is the most optimal design for achieving efficient crossflow turbine performance under the specified operating conditions.
Analysis of the Effect of Bottom Blade Inclination Angle Variations on Torque in Vortex Turbines Using Computational Fluid Dynamics (CFD) Badri Kurniawan; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 3 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i3.887

Abstract

The development of renewable energy in Indonesia is a strategic effort to meet increasing energy demands while reducing dependence on fossil fuels. One promising approach is utilizing river flow for micro-hydro power generation, particularly with vortex turbines that operate efficiently under low head and discharge conditions. This study aims to analyze the effect of varying bottom blade inclination angles on the torque generated by a vortex turbine using Computational Fluid Dynamics (CFD) simulations. The research employed ANSYS Fluent with a k-? SST turbulence model and used a three-dimensional numerical method to evaluate three inclination angles: 22.5°, 32°, and 42°. The results show that blade inclination significantly influences torque values, with the 22.5° angle producing the highest torque of 10.95 Nm, followed by 32° at 10.79 Nm, and 42° at 10.58 Nm. These findings indicate that optimizing blade inclination improves turbine performance, contributing to the development of efficient micro-hydro systems for renewable energy applications.
Utilizing Augmented Reality Media to Enhance Students’ Lathe Learning Outcomes Ariansyah Ariansyah; Febri Prasetya; Purwantono Purwantono; Randi Purnama Putra
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 3 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i3.889

Abstract

The integration of technology in vocational education has become a critical need to support 21st-century skills, especially in practice-based learning such as Basic Mechanical Engineering subjects. One promising innovation is the use of Augmented Reality (AR) media, which enables interactive three-dimensional visualization to help students concretely understand abstract concepts. This study aims to examine the effectiveness of lathe-based AR media in improving student learning outcomes and motivation in Grade X of the Machining Engineering Department at SMK Semen Padang. The research employed a quasi-experimental method using a non-equivalent control group design. The subjects consisted of two classes: the experimental class (using AR media) and the control class (using conventional learning methods). Data were collected using pre-tests and post-tests to assess learning outcomes and Likert-scale questionnaires to evaluate learning motivation. The analysis results showed that the use of AR media significantly increased student learning outcomes and motivation compared to traditional methods. Based on hypothesis testing and normalized gain score analysis, the AR media was found to be highly effective in the learning process. In conclusion, lathe-based Augmented Reality media proved to be an effective interactive learning tool that enhances students' academic performance and motivation, while also contributing to the development of innovative media in technical education.
Analysis Of The Effect Of Penstock Diameter Variation And Nozzle Flow Velocity On Pelton Turbine Performance Using Computational Fluid Dynamics (CFD) Revaldo Nur Hidayat; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 2 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/18k9e415

Abstract

The performance of a Pelton turbine in micro-hydropower plants is influenced by penstock design and fluid flow conditions. Variations in penstock diameter can lead to changes in head loss, flow velocity, and energy transfer efficiency. This study aims to analyze the effect of penstock diameter variation and nozzle flow velocity on Pelton turbine performance under different head conditions using the Computational Fluid Dynamics (CFD) method.Simulations were conducted using penstock diameters of 4 inches, 5 inches, and 6 inches with ANSYS software. The results show that the respective head losses are 0.010 m, 0.006 m, and 0.0028 m, indicating that larger diameters reduce friction losses in the flow. The corresponding nozzle velocities are 8.90 m/s, 9.08 m/s, and 8.64 m/s, with the highest value observed at the 5-inch diameter due to the balance between flow rate and energy losses. The resulting torque values are 2.13 Nm, 2.55 Nm, and 2.60 Nm, while the rotor rotational speeds are 150.87 W, 189.07 W, and 194.90 W. The effective power generated is 65.59 W, 80.21 W, and 77.79 W, with efficiencies of 43.77%, 42.44%, and 39.95%, respectively. The results indicate that a 5-inch penstock diameter provides the most optimal performance, as it achieves the best balance between head loss, flow distribution, and fluid energy transfer.
Design and Crash Test on a Two-Passenger City Car Frame using Finite Element Method Randi Purnama Putra; Dori Yuvenda; Wanda Afnison; Remon Lapisa; Milana Milana; Anna Niska Fauza; Dani Harmanto
Automotive Experiences Vol. 7 No. 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11306

Abstract

The chassis is an important part of a car which must have a strong construction to withstand the weight of the vehicle. The purpose of this research is to create a city car's chassis that can hold two passengers and then crash-test the finished product. In this research, a development method was used using SolidWorks software and the student version of ANSYS R2 2023 as software for creating chassis designs and crash test simulations. The study's findings indicate that the car frame's measurements are 2.46 meters in length, 1.33 meters in height, and 1.39 meters in width. The steel of the ASTM A36 type was utilized as the material in the computational study of the frame. The results show that increasing speed causes an increase in deformation, with the peak deformation at a speed of 100 km/h. The maximum deformation occurs at 0.007 seconds with a value of 203.51 mm at the top pillar of the car. The deformation increases from 97.196 mm at 0.0035 s to 161.22 mm at 0.0056 s. However, deformation occurs mainly in the front zone of the car frame and is not significant in the passenger zone.
Aerodynamic Approach to Two-Passenger City Car Design: A Study of Square Back and Compact Shapes Randi Purnama Putra; Dori Yuvenda; Remon Lapisa; Wanda Afnison; Milana Milana; M. Yasep Setiawan; Ahmad Arif; Dani Harmanto
Automotive Experiences Vol. 8 No. 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.13686

Abstract

The development of lightweight electric cars for urban mobility requires efficient aerodynamic design without sacrificing space efficiency. This study presents a novel method by investigating the combination of a two-seater city car's compact dimensions and square back shape, which has not been extensively researched for low- to medium-velocity vehicles. This study's objective is to assess the design's aerodynamic performance using numerical simulations using the Computational Fluid Dynamics (CFD) approach. The vehicle model is designed with a compact body and square back, which is commonly used in small vehicles with high maneuverability requirements. The simulations are conducted at three different air velocity levels: 10, 20, and 30 m/s. The results of the study showed an increase in the value of the drag coefficient (Cd) along with an increase in flow velocity. At a velocity of 10 m/s, the Cd value was recorded at 0.4536. When the velocity increased to 20 m/s, the drag coefficient increased slightly to 0.4563. Further increases in velocity to 30 m/s resulted in a Cd value of 0.4581. This Cd value shows the consistency of aerodynamic performance with increasing velocity, with fluctuations that remain within the efficiency limits of lightweight vehicles. The pressure distribution contour shows high-pressure accumulation at the front and low pressure at the rear of the vehicle, which generates large turbulent wakes in the rear area and contributes to increased drag. These findings indicate that the square rear body design faces significant aerodynamic challenges. Therefore, design strategies such as adding a rear spoiler, using a rear diffuser, and optimizing the rear body angle are suggested as potential solutions to improve flow efficiency.
HUBUNGAN MINAT MELANJUTKAN STUDI KE PERGURUAN TINGGI DENGAN PRESTASI BELAJAR SISWA JURUSAN TEKNIK MESIN SMK NEGERI 1 BUKITTINGGI Vickram Reski Andri; Dori Yuvenda; Rifelino Rifelino; Randi Purnama Putra
VOCATIONAL: Jurnal Inovasi Pendidikan Kejuruan Vol. 6 No. 3 (2026)
Publisher : Pusat Pengembangan Pendidikan dan Penelitian Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51878/vocational.v6i3.12924

Abstract

ABSTRACT Student academic achievement in vocational high schools (SMKs) is influenced by various internal factors, one of which is the interest in pursuing higher education. A preliminary survey of Mechanical Engineering students at SMK Negeri 1 Bukittinggi indicated differences in academic achievement between students intending to continue their studies and those planning to enter the workforce directly. This study aimed to examine the relationship between students' interest in pursuing higher education and their academic achievement. A quantitative associative approach with an ex post facto design was employed. The population consisted of Mechanical Engineering students in the 2025/2026 academic year, with a sample of 59 respondents selected using Proportional Stratified Random Sampling. Data were collected through a questionnaire to measure students' interest in pursuing higher education and report card records to measure academic achievement. Data were analyzed using the Pearson Product-Moment Correlation test. The findings revealed a positive and statistically significant relationship between interest in pursuing higher education and academic achievement (r = 0.426, p = 0.001 < 0.05). The coefficient of determination (R² = 0.182) indicated that interest in pursuing higher education accounted for 18.2% of the variance in students' academic achievement. These findings suggest that a stronger interest in pursuing higher education is associated with better academic achievement among vocational high school students. ABSTRAKPrestasi belajar siswa Sekolah Menengah Kejuruan (SMK) dipengaruhi oleh berbagai faktor internal, salah satunya minat melanjutkan studi ke perguruan tinggi. Survei awal pada siswa Jurusan Teknik Mesin SMK Negeri 1 Bukittinggi menunjukkan adanya perbedaan rata-rata prestasi belajar antara siswa yang berminat melanjutkan studi dan yang memilih langsung bekerja. Penelitian ini bertujuan untuk mengetahui hubungan antara minat melanjutkan studi ke perguruan tinggi dengan prestasi belajar siswa Jurusan Teknik Mesin SMK Negeri 1 Bukittinggi. Penelitian menggunakan metode kuantitatif asosiatif dengan desain ex post facto. Populasi penelitian adalah siswa Jurusan Teknik Mesin tahun ajaran 2025/2026 dengan sampel sebanyak 59 responden yang dipilih menggunakan teknik Proportional Stratified Random Sampling. Data dikumpulkan melalui angket untuk mengukur minat melanjutkan studi dan dokumentasi nilai rapor untuk mengukur prestasi belajar. Analisis data menggunakan korelasi Pearson Product Moment. Hasil penelitian menunjukkan terdapat hubungan positif dan signifikan antara minat melanjutkan studi dengan prestasi belajar (r = 0,426; p = 0,001 < 0,05). Koefisien determinasi (R²) sebesar 0,182 menunjukkan bahwa minat melanjutkan studi memberikan kontribusi sebesar 18,2% terhadap prestasi belajar siswa. Dengan demikian, semakin tinggi minat siswa untuk melanjutkan studi ke perguruan tinggi, semakin baik prestasi belajar yang dicapai.
PENGARUH PENGALAMAN PRAKTIK KERJA INDUSTRI PADA KEMAMPUAN AKADEMIK SISWA MATA PELATIHAN PEMBUBUTAN TEKNIK PEMESINAN Yoga Volanda Saputra; Eko Indrawan; Wanda Afnison; Randi Purnama Putra
Jurnal Vokasi Mekanika (VoMek) Vol 5 No 3 (2023): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v5i3.577

Abstract

Pendidikan vokasi merupakan pendidikan yang terfokus pada praktik kerja yang berfungsi penunjang keahlian di bidang studi hal ini sangat penting untuk dimiliki sebagai standar kompetensi memasuki suatu industri. Praktek Kerja Industri (PKL) atau yang juga dikenal sebagai magang adalah bagian integral dari pendidikan vokasi atau pendidikan tinggi di mana siswa atau mahasiswa memiliki kesempatan untuk berpartisipasi dalam pengalaman kerja nyata di industri terkait dengan bidang studi mereka. SMK Semen Padang sebagai salah satu lembaga pembelajaran yang bernaung sebagai yayasan pembelajaran Semen Padang sebagai jurusan Teknik Mesin juga mengerjakan kewajiban magang sebagai muridnya yang sudah memasuki kelas XI menuju kelas XII. Murid yang telah melaksanakan praktek kerja industri akan dinilai. Penelitian ini menggunakan konsep korelasional berjenis penelitian kuantitatif, data yang diperlukan menggunakan kuisonerer dan dokumentasi lalu diolah melalui SPSS 4. Hasil penelitian ini memperlihatkan adanya kontribusi antar pengalaman kerja pada kemampuan akademik murid Kelas XII Kompetensi Keahlian Teknik Pemesinan SMK Semen Padang merujuk sebanyak 13,35% dalam kategori rendah dan 86,65 % ada faktor lain yang mempengaruhi terhadap kemampuan akademik. Terdapat kontribusi antara Keahlian kerja terhadap kemampuan akademik murid Kelas XII Kompetensi Keahlian Teknik Pemesinan SMK Semen Padang. Hal ini terbukti dari analisa korelasi didapatkan dari nilai hasil uji korelasi (r) sebanyak 0,2755. Hal ini memperlihatkan perolehan nilai r hiitung > r tabel sebanyak 0,116. Kelak dapat disimpulakn bahwa 0,2755 > 0,116 kelak Ha terima dan Ho tertolak.
RANCANG BANGUN PEMBANGKIT LISTRIK BERSKALA KECIL MODEL TURBIN VORTEX SEBAGAI APLIKASI TEKNOLOGI TEPAT GUNA DI NAGARI KURANJI HULU Purwantono Purwantono; Dori Yuvenda; Randi Purnama Putra; Muhibbudin Muhibbudin; Muldi Yuhendri
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 1 (2024): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i1.649

Abstract

Pembangkit listrik berskala kecil masih banyak dibutuhkan dikalangan masyarakat, khususnya di daerah tertinggal yang tidak terjangkau aliran Listrik PLN. Kawasan hutan lindung merupakan sumber potensi air yang muaranya adalah aliran sungai-sungai baik kecil maupun besar. Nagari Kuranji Hulu memiliki sumber air sebagai energi kinetic yang dapat dikonversi menjadi energi listrik atau tenaga pikohidro, Masyarakat di sekitarnya hanya memanfaatkan sebagai irigasi untuk persawahan. Teknologi Tepat Guna sebagai alternatif yang dapat membuka wawasan bagi masyarakt desa. Aplikasi Teknologi Tepat Guna ini diantaranya adalah Turbin air vortex. Turbin Vortex ini mempunyai keuntungan yaitu jumlah alairan air yang dibutuhkan relatif kecil, ketinggian permukaan jatuh air juga kecil dan ini sangat sesuai dengan kondisi aliran air pada sungai kecil atau parit. Secara keseluruhan biaya pembuatan pembuatan Turbin Vortex ini menjadi lebih murah. Konstruksi Turbin Vortex dirancang dengan menggunakan komponen komponen yang relatif kecil dan ringan sehingga secar keseluruhannya juga menjadi lebih murah, disamping itu dengan komponen yang kecil dan ringan ini memudahkan untuk mobilitas pemasangan Vortex. Konstruksi pembuatan Vortex ini tidak membutuhkan bendungan besar, pipa saluran panjang, dan pintu air yang besar. Penggunaan konstruksi kincir model turbin vortex ini dapat digunakan pada daerah aliran sungai yang mempunyai kecepatan aliran air antara 1–5 m/s tanpa harus diletakan pada air terjun yang tinggi. Pengujian alat ini dilakukan di Kanagarian Kuranji Hulu dengan membuat sebuah konstruksi tenaga listrik berskala kecil. Rancang bagun turbin ini dimulai dari survei awal di lapangan, analisis kapasitas turbin tenaga air, perencanaan desain turbin, proses fabrikasi dan pengujian kinerja dari turbin vortex.
Co-Authors A, Yufrizal Ahmad Arif Ahmad Arif Akbar, Arifki Aldo Alfattah Sudjono Andre Kurniawan Andre Kurniawan Andrizal Andrizal Anna Niska Fauza Aprinaldi Aprinaldi Arafat, Andril Ariansyah Ariansyah Arif Juliari Kusnanda Asadellah, Dimas Pandhu Asnil Asnil Aswanto, Trio Harinaldi Aziz, Wildan Abdul Badri Kurniawan Bahrul Amin Bambang Sudarmanta Budi Syahri Bulkia Rahim Chandra, Shandika Dani Harmanto Dani Harmanto Dori Yuvenda Eko Indrawan Erzeddin Alwi Fadhilah Fadhilah Fadhilah Ikhsan Dinul Fajar Surya Farhan Rahmat Putra Fauza, Anna Niska Febri Prasetya Febrianti, Roza Fitrah Qalbina Ghozali, Rahmatul Jamaludin Jamaludin Jasman Jasman Junil Adri Krismadinata Krismadinata M. Yasep Setiawan Martias Martias Martias Martias Milana Milana Mirta Widia Muhammad Aulia Muhammad Thoriqul Hadysyah Muhibbudin Muhibbudin Muji Setiyo Muldi Yuhendri Nadry Heroza Nelvi Erizon Nurdin Hendri Oki Muraza Phonepasith Phongdala Phongdala, Phonepasith Purwantono Purwantono Purwantono, Purwantono Rahadian Zainul Refdinal, Refdinal Remon Lapisa Revaldo Nur Hidayat Rezki Alhakim Rifelino Rifelino Romy Dwipa Yamesa Away Roza Febrianti Sri Rizki Putri Primandari Tin, Chau Trung Toto Sugiarto Tun, Hla Myo Vernando, Willy Hardi Vickram Reski Andri Wagino Wagino Wanda Afnison Wanda Afnison Waskito Waskito, Waskito Widia, Mirta Willy Hardi Vernando Wira, Aski Wulansari, Rizky Ema Ya, Kyaw Zay Yoga Volanda Saputra Yogi Dian Alfana Yolli Fernanda Yufrizal Yufrizal Zainal Abadi