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All Journal Jurnal Optimasi Sistem Industri JURNAL PENDIDIKAN TAMBUSAI Journal on Education JOURNAL OF SCIENCE AND SOCIAL RESEARCH Jurnal Ilmiah Profesi Pendidikan Scientific Journal of Mechanical Engineering Kinematika Didaktik : Jurnal Ilmiah PGSD STKIP Subang GANDRUNG: Jurnal Pengabdian Kepada Masyarakat Teknomekanik Journal of Mechanical Engineering Jurnal Vokasi Mekanika Tsaqofah: Jurnal Penelitian Guru Indonesia MASALIQ: Jurnal Pendidikan dan Sains TeknoKreatif: Jurnal Pengabdian kepada Masyarakat Journal of Sciencce Technology and Visual Culture Greensusmater
Fitrah Qalbina
Universitas Negeri Padang
Religion Arts Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Implementasi Sistem Manajemen Keselamatan Dan Kesehatan Kerja di Jurusan Teknik Permesinan SMK Negeri 5 Padang Kelvin Permana Saputra, Dwi; Irzal, Irzal; Yuvenda, Dori; Qalbina, Fitrah
Jurnal Pendidikan Tambusai Vol. 9 No. 1 (2025)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v9i1.26384

Abstract

Penelitian ini dilatarbelakangi oleh rendahnya pemahaman, kesadaran, dan kepedulian siswa SMK Negeri 5 Padang terhadap bahaya kerja saat praktik, khususnya dalam mematuhi aturan Sistem Manajemen Keselamatan dan Kesehatan Kerja (SMK3). Tujuan dari penelitian ini adalah untuk memperoleh gambaran mengenai pelaksanaan SMK3 di Jurusan Teknik Permesinan SMK Negeri 5 Padang, sehingga dapat meningkatkan kepatuhan siswa terhadap prosedur keselamatan kerja. Penelitian ini menggunakan metode deskriptif dengan pendekatan kuantitatif. Data dikumpulkan melalui kuesioner tertutup dan dokumentasi. Responden terdiri dari siswa kelas XI dan XII Teknik Permesinan yang dipilih secara acak. Hasil penelitian menunjukkan bahwa pelaksanaan SMK3 dalam indikator perencanaan memperoleh kategori “sesuai” dengan rata-rata skor 25,6 dari skor maksimal 36. Pada indikator penerapan, hasilnya masuk dalam kategori “kurang sesuai” dengan rata-rata skor 42,09 dari skor maksimal 68. Sedangkan pada indikator evaluasi, hasilnya juga termasuk “kurang sesuai” dengan rata-rata skor 10,3 dari skor maksimal 16. Berdasarkan temuan ini, dapat disimpulkan bahwa penerapan dan evaluasi SMK3 di jurusan tersebut masih memerlukan peningkatan, terutama dalam hal implementasi nyata di lingkungan praktik siswa.
Using hand painting in the fabrication of a negative refractive index metamaterial based on circular shape with paper as the dielectric Hamonangan M , Felix R.M. Hamonangan M; Yudistira , Hadi Teguh Yudistira; Qalbina , Fitrah; Saputro , • Adhitya Gandaryus; Faisal , Amir
Greensusmater Vol. 1 No. 1 (2024): Inaugural issue
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2024.1.1.15-19

Abstract

This study aims to use the hand-painting method in designing and fabricating a metamaterial based on a circular shape that exhibits a negative refractive index over the microwave spectrum. Hand painting is a simple and inexpensive fabrication method. This study applies silver ink as a periodic conductor to glossy paper as the dielectric substrate. The spectrum of investigation in this study is 3–6 GHz, and the experiment results are compared with the simulation results. The slight error obtained between transmission results from the simulation and the experiments reflects limitations in the fabrication methods used. Overall, the experiment results have a similar trend to the simulation results. The electrical properties of the metamaterial are retrieved from the transmission and reflection simulation results. The simulation results are employed instead of the experimental results because of the fluctuating data provided by the latter. The refractive index presents a negative value at 3–3.6 GHz.
The influence of processing temperature on the mechanical properties of recycled PET fibers Fauza, Anna Niska; Qalbina, Fitrah; Nurdin, Hendri; Ambiyar, Ambiyar; Refdinal, Refdinal
Teknomekanik Vol. 6 No. 1 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.094 KB) | DOI: 10.24036/teknomekanik.v6i1.21472

Abstract

Study towards the recycling of PET waste has arisen in the last decades. One of the most widely used methods was the mechanical recycling process due to its simplicity and low cost of production. In this research, PET waste obtained from the disposable water gallon containers was used to produce recycled PET fibers for textile applications. The PET fibers were prepared using the extrusion technique by varying the processing temperatures, i.e., 200, 210, 220, 230, and 240°C. The diameter, FTIR analysis, XRD analysis, and mechanical properties of the PET fibers at various processing temperatures were studied. The results showed that the optimum processing temperature for preparing recycled PET fibers was 210°C with a diameter of 0.23 mm, a degree of crystallinity of 8.9%, a tensile strength of 70.4 MPa, and an elongation at break of 83.6%. In conclusion, PET waste shows a promising application to be processed as recycled PET fibers for textile applications.
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 NUMERIK KINERJA TURBIN ANGIN DARRIEUS TIPE H TERHADAP VARIASI JUMLAH BLADE DAN KECEPATAN ANGIN DENGAN PENDEKATAN SIMULASI CFD Diki Afrianto; Andre Kurniawan; Yolli Fernanda; Fitrah Qalbina
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.v11i04.8776

Abstract

This study aims to analyze the aerodynamic performance of an H-type Darrieus wind turbine by varying the number of blades and wind speeds using the Computational Fluid Dynamics (CFD) method. The turbine geometry was modeled using SolidWorks 2022 and numerically simulated with ANSYS Fluent 2025. The models consist of three-blade and four-blade configurations employing the NACA 0012 airfoil profile, tested under three different freestream wind velocities: 7 m/s, 9 m/s, and 11 m/s. The simulations were conducted within static and rotating domains to examine the fluid flow characteristics around the rotor, including velocity distribution, pressure field, torque, and power efficiency. The results show that increasing wind speed leads to more complex and turbulent flow behavior, characterized by the emergence of vortex shedding behind the blades. The torque coefficient (Ct) and power coefficient (Cp) increased with higher wind speeds in the three-blade configuration, indicating greater energy conversion efficiency compared to the four-blade configuration. Conversely, the four-blade turbine exhibited reduced efficiency at higher wind speeds due to increased drag forces and inter-blade interactions, which caused energy losses. Overall, the findings demonstrate that the three-blade H-type Darrieus turbine provides superior aerodynamic efficiency and rotational stability at medium to high wind speeds, whereas the four-blade configuration performs better at lower wind speeds by generating higher starting torque. These results are expected to serve as a reference for the development of efficient vertical-axis wind turbine designs suitable for wind conditions in Indonesia.
Faktor-Faktor Kesulitan Belajar Pembuatan Pola Praktis Pada Mata Pelajaran Pembuatan Pola Tata Busana di SMKN 1 Ampek Angkek Fitrah Qalbina; Ernawati Ernawati
Jurnal Ilmiah Profesi Pendidikan Vol. 10 No. 1 (2025): Februari
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jipp.v10i1.3196

Abstract

Penelitian ini dilatar belakangi oleh adanya permasalahan kesulitan belajar yang dialami oleh siswa kelas XI Tata Busana tahun ajaran 2023/2024 pada mata pelajaran pembuatan pola. Penelitian ini bertujuan untuk mengetahui (1) faktor-faktor penyebab kesulitan belajar pembuatan pola parktis pada mata pelajaran pembuatan pola di SMKN 1 Ampek Angkek ditinjau dari faktor internal yang meliputi sikap terhadap  belajar, motivasi dan rasa percaya diri (2) faktor-faktor penyebab kesulitan belajar pembuatan pola praktis pada mata pelajaran pembuatan pola di SMKN 1 Ampek Angkek ditinjau dari faktor eksternal yang meliputi  keluarga, sekolah dan masyarakat. Metode yang digunakan dalam penelitian ini adalah penelitian deskriptif kuantitatif. Populasi pada penelitian ini adalah seluruh siswa kelas XI Tata busana SMKN 1 Ampek Angkek tahun ajaran 2023/2024 yang berjumlah 54 siswa. Teknik pengambilan sampel dengan nonprobability sampling (sampel jenuh), sehingga seluruh populasi dijadikan sampel. Teknik pengumpulan data menggunakan angket dengan skala likert yang telah diuji validitas dan realibilitasnya. Selanjutnya teknik analisis data yang digunakan adalah analisis statistik deskriptif menggunakan aplikasi SPSS dan microsoft excel. Hasil penelitian menunjukkan bahwa (1) faktor kesulitan belajar ditinjau dari faktor internal adalah sebagai berikut: indikator sikap terhadap belajar sebesar 43% atau 23 siswa dalam kategori sedang, indikator motivasi sebesar 41% atau 22 siswa dalam kategori sedang dan indikator rasa percaya diri sebesar 54%. Atau 29 siswa dalam kategori sedang (2) faktor kesulitan belajar ditinjau fari faktor eksternal sebagai berikut:  indikator keluarga sebesar 37% atau 20 siswa dalam kategori tinggi, infikator sekolah sebesar 39% atau 21 siswa dalam kategori sedang dan indikator masyarakat sebesar 41%  atau 22 siswa dalam kategori rendah.
Analisis Soft Skill dan Kesiapan Memasuki Dunia Kerja Siswa Bidang Teknologi dan Kejuruan SMKS Semen Padang Refi Habibullah Karim; Rizky Ema Wulansari; Mulianti Mulianti; Fitrah Qalbina
TSAQOFAH Vol 6 No 3 (2026): MEI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v6i3.10217

Abstract

Work readiness among technology and vocational students is determined not only by mastery of technical competencies but also by soft skills that support adaptation, collaboration, and professionalism in the workplace. This study aims to analyze the level of soft skills, work readiness, and the relationship between the two among technology and vocational students at SMKS Semen Padang. This study used a descriptive quantitative approach with a correlational design. The research population consisted of students in Grades XI and XII, with a sample of 59 respondents selected using proportional random sampling. Data were collected using a Likert-scale questionnaire that had been declared valid and reliable. Data analysis techniques included descriptive statistics, normality testing, linearity testing, and Pearson correlation analysis. The results show that students’ soft skills were in the very good category, with an average percentage of 81.94%. The most dominant aspect was creativity and problem solving, followed by teamwork, time management, leadership, work ethics, and communication. Students’ work readiness was in the very ready category, with a percentage of 85.63%. In addition, there was a very strong positive and significant relationship between soft skills and work readiness, with a Pearson correlation coefficient of 0.988 (p < 0.05). The conclusion of this study emphasizes that soft skills are strongly associated with vocational high school students’ readiness to enter the workforce. These findings imply the importance of strengthening learning based on soft skill development in vocational education so that graduates are better prepared to meet the demands of the workforce.
Effect of Airfoil Profile Variations on the Rear Wing of a Racing Car on the Downforce Coefficient Using Computational Fluid Dynamics (CFD) Simulation Carlen Muhammad Hendra; Delima Yanti Sari; Arwizet K; 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.v7i3.881

Abstract

Variation of airfoil profile shape in race car rear wings plays a crucial role in generating optimal downforce to improve traction and vehicle stability. The main issue addressed in this study is the lack of clarity regarding which airfoil profile and angle of attack configuration are most effective in producing the highest downforce coefficient (Cdown). This research aims to analyze the aerodynamic performance of symmetric airfoils NACA 0012 and NACA 0015 at three different angles of attack, namely 9.5°, 19.5°, and 29.5°, using Computational Fluid Dynamics (CFD) simulation. The simulations were performed under steady-state flow conditions with an appropriate turbulence model to accurately capture pressure distribution and airflow characteristics. Results show that NACA 0012 generated higher and more stable Cdown values at low to medium angles, with the highest value of 1.4 at 29.5°. In contrast, NACA 0015 exhibited a more gradual performance increase and reached a Cdown of 1.2 only at the highest angle. The study concludes that slender airfoil profiles like NACA 0012 are more suitable for circuits with sharp corners, while NACA 0015 is better suited for straight tracks requiring progressive aerodynamic stability. This research contributes to optimizing rear wing design based on the aerodynamic demands of race cars.
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.
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.
Co-Authors Ambiyar, Ambiyar Ananda, Yoga Rizki Andre Kurniawan Arirohman, Ilham Dwi Arwizet Arwizet, Arwizet Asadellah, Dimas Pandhu Badri Kurniawan Bagas Santoso Budi Syahri Carlen Muhammad Hendra Deendarlianto Delima Yanti Sari Diki Afrianto Dori Yuvenda Ernawati Ernawati Ernawati Ernawati Fadhilah Ikhsan Dinul Faisal , Amir Fajar Paundra Fajar Surya Fauza, Anna Niska Febri Prasetya Guguk, Kardo Raja Hamonangan M , Felix R.M. Hamonangan M Harmiansyah Hary Fandeli Indarto Indarto Irzal, Irzal Kelvin Permana Saputra, Dwi Lathifa Putri Afisna Melri Deswina Micko Tomas Muhammad Aulia Muhammad Syaukani Mulianti Nasywa Firdaus Har Nurdin Hendri Paundra, Fajar Purnama Putra, Randi Purwantono, Purwantono Putra, Randi Purnama Putty Yunesti Raihan Ramadhan Ramadan, Ryan Refdinal, Refdinal Refdinal, Refdinal Refi Habibullah Karim Revaldo Nur Hidayat Rezki Alhakim Rita Kurnia Rizky Ema Wulansari Rizky Ema Wulansari Rustam Efendi Sabar Sabar Saputro , • Adhitya Gandaryus Suci Andri Sugatra Dwi Atmaja Teguh Wibowo Wahyudi Wahyudi Yolli Fernanda Yudistira , Hadi Teguh Yudistira Zikri, Khairul Zulkifli N