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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Voteteknika (Vocational Teknik Elektronika dan Informatika) SPEKTRUM: Jurnal Pendidikan Luar Sekolah (PLS) JTEV (Jurnal Teknik Elektro dan Vokasional Journal of Tropical Soils Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) JOIV : International Journal on Informatics Visualization Al Ishlah Jurnal Pendidikan Sinkron : Jurnal dan Penelitian Teknik Informatika QALAMUNA: Jurnal Pendidikan, Sosial, dan Agama Jurnal Penelitian Pendidikan IPA (JPPIPA) Martabe : Jurnal Pengabdian Kepada Masyarakat JURNAL PENDIDIKAN TAMBUSAI JOURNAL OF SCIENCE AND SOCIAL RESEARCH JRTI (Jurnal Riset Tindakan Indonesia) SCAFFOLDING: Jurnal Pendidikan Islam dan Multikulturalisme JSR : Jaringan Sistem Informasi Robotik Community Engagement and Emergence Journal (CEEJ) Jurnal Pendidikan Teknologi Informasi dan Vokasional At-Tajdid : Jurnal Pendidikan dan Pemikiran Islam Teknomekanik ARSY : Jurnal Aplikasi Riset kepada Masyarakat Jurnal Vokasi Mekanika Journal of Community Service Journal of Engineering Researcher and Lecturer Asian Journal of Science, Technology, Engineering, and Art Jurnal Penelitian Pendidikan Indonesia

Refdinal, Refdinal

Unknown Affiliation

Author-ID : 1108901

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

Published : 62 Documents Claim Missing Document

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Differences Strength of Low Carbon Stainless Steel St 37 with Electrical Welding Compound V Use Materials Add Electrodeof Type-RB and Type -RD Refdinal, Refdinal; Ramli, Ramli; Andesko, Rio
Teknomekanik Vol. 1 No. 1 (2018): Regular Issue
Publisher : Universitas Negeri Padang

This study aims to determine the difference in tensile strength of low carbon steel St 37 which is welded with RB type and RD type electrodes. The welding utilizes the type of a V-shaped joint with an angle of 600. After low carbon steel St 37 is then subjected to a tensile strength test / tensile test to obtain a tensile strength value. This research uses experimental method by preparing the object of research in the form of tensile test specimen which amounted to 19 pieces and separated into 3 groups. Group I was an untreated / non-welded St 37 carbon steel, a Group II of low carbon steel St 37 welded with RB type electrodes, and a Group III of low carbon steel St 37 welded with RD type electrodes. The cooling medium used after welding is air. The tensile test results show that the average tensile strength of low carbon steel St 37 without welding has a tensile strength of 48.02 kg/mm2 with the largest specimen tensile strength of 48.33 kg/mm2 and strength At the low carbon steel welding St 37 using RB type electrode has an average tensile strength of 29.86 kg/mm2 with the tensile strength of the largest specimen of 34.51 kg/mm2 and the tensile strength of the lowest specimen is 25.00 kg/mm2. While on the low carbon steel welding St 37 using RD type electrode has an average power of 31.83 kg/mm2 with the tensile strength of the largest specimen is 34.51 kg/mm2 and the tensile strength of the lowest specimen is 25.81 kg/mm2. Based on the analysis and T test of low carbon steel welding ST 37 using RB type electrode and RD type there is no significant tensile strength difference

Numerical Analysis of Fluid Flow on Cross Flow and Kaplan Turbine Prototype Purwantono, Purwantono; Sidiq, Ahmad Halim; Irzal, Irzal; Refdinal, Refdinal
Teknomekanik Vol. 1 No. 2 (2018): Regular Issue
Publisher : Universitas Negeri Padang

Based on previous research conducted by Purwantono about the utilization of exhaust flow from a conventional cross-flow turbine prototype that was used as an inlet of tubin Kaplan [1]. This research was carried out to see how the exhaust flow velocity of each tubin before and after was combined into one combination turbine. This numerical based study uses the Ansys 18.0 application by inputting a 3D design from a conventional turbine prototype which was used as the material for this study. The results obtained in this study show the average of outlet velocity in the Kaplan turbine that uses a velocity outlet from a cross flow turbine of 0.3 m / s greater when it is combined, which is 8.33 m / s and after being combined to 0.38 m / s. The results of this study are expected to contribute to the development of conventional turbines later

Welding Competence Training at Dropout Youth Refdinal, Refdinal; Ardi, Junil; Purwantono, Purwantono
Teknomekanik Vol. 2 No. 1 (2019): Regular Issue
Publisher : Universitas Negeri Padang

The problem with partners is drop out youth who do not have competence. The condition of the community dropping out of school and working as unskilled labourers has an impact on the low level of public welfare. The distance between the Dharmasraya district and the provincial capital has an impact on the contrast of the quality of education carried out which causes the community to not understand the importance of education. So that some of the human resources in Dharmasraya have become manual labourers in plantations and factories. The purpose of implementing this service activity is to provide a solution to the problems faced by the community, especially for school dropouts. Most of the dropout youths who are junior high school (SMP) level do not have special competencies that make them have added value. The work carried out by this young man is only limited to gardening and does not guarantee economic prosperity. Through this service activity, TIM strives to provide competency in the welding field that can be used to open a business that is much needed by the community. The training activities were designed for 3 days which will be held from October 12 to October 14 2018. The speakers in this activity were Drs. Purwantono, M.Pd, who has a BNSP level I welding certificate and the second speaker is Junil Adri, M.Pd.T who has a BNSP level III welding certificate. On the first day, the speaker will convey the basic concepts in the welding process and demonstrate how to make weld grooves and connect the plate in the welding process. On the second day, the speakers began to invite participants to design products that could be made through welding activities in accordance with the needs of the community. In this activity, TIM directed to make a trellis fence. TEAM began to guide participants in the process of making a trellis. On the third day, the TEAM provided direction on how to weld entrepreneurial opportunities in the field. The chairperson of the service with TIM asked the kenagarian to be able to accommodate the birth of new entrepreneurs for youth who could make independent and productive people.

Hardness Analysis of Stone Breaker Chisel Made of Medium Carbon Steel as a Result of Hardening Using Water Cooling Media Novendra, Alan; Refdinal, Refdinal; Le, Sai Kham
Teknomekanik Vol. 3 No. 1 (2020): Regular Issue
Publisher : Universitas Negeri Padang

Stone chisels produced by blacksmiths which are made using leaf spring steel are often too brittle or fragile so that when they are used, they often occur in the form of cracks and breaks. This study aims to determine the appropriate hardness level for stone chisels. The process is carried out by comparing the hardness level of stone chisels that have been used but still in good condition and those that have been damaged. Broken stone chisels have a high adequate hardness compared to good stone chisels so that damaged stone chisels can be reconditioned to get the right rock chisel hardness. Heat treatment is given to damaged stone chisels to improve the hardness level by normalizing the process to restore the initial mechanical properties of the steel and increasing the hardness of the chisel by heating the steel and then quenching it using water cooling media. Based on the experimental process carried out that the hardness level of a good stone chisel is between 228 HB to 320 HB by heating the duan spring steel to a temperature of 780ºC with a hold time of 10 minutes then cooling it quickly using water and stone chisels can break when it is used because it has a very high hardness.

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

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.

Optimizing vertical-axis wind turbine designs: A comparative CFD analysis of savonius, darrieus, and savonius-darrieus configurations Erizon, Nelvi; Refdinal, Refdinal; Jasman, Jasman; Irzal, Irzal; A, Yufrizal; Fahrezi, Muhammad Shadiq; Fernanda, Firza; Fadillah, Egi; Pepito, Ma Leona Maye B.
Teknomekanik Vol. 8 No. 2 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i2.33172

This study aims to evaluate the performance of vertical-axis wind turbines (VAWTs) with three different configurations, including Savonius, Darrieus, and a Savonius-Darrieus hybrid wind turbine, using Computational Fluid Dynamics (CFD) simulations. The methodology involves 3D geometry modeling, simulation parameter setup, meshing, and post-simulation analysis using SolidWorks 2022 software. The simulation results indicate that the Savonius turbine achieves the highest power coefficient (Cp) and torque coefficient (Ct) among the three designs, with a maximum Cp value of 0.5 at a Tip-Speed Ratio (TSR) of 0.4. Conversely, the hybrid turbine demonstrates lower efficiency, although it theoretically offers potential for improving performance at low wind speeds. Pressure and flow velocity distributions reveal that the Savonius turbine maintains the most stable pressure pattern compared to the other configurations. These findings highlight the potential of the Savonius turbine as a small-scale renewable energy solution, particularly in urban areas with low wind speeds. Further research is recommended to optimize hybrid turbine designs using machine learning approaches and empirical validation through field experiments to support the achievement of Sustainable Development Goals (SDGs), particularly Goal 7, affordable and clean energy.

Co-Authors A, Yufrizal Abdul Aziz Abdullah, MT, Dr. Rijal Abrar Tanjung Adzkia, Mhd Safiq Afriza Media Albasyit, Muhammad Ravi Ambiyar, Ambiyar Ameliza, Kiki Andesko, Rio Andre Kurniawan Anwar, M Ardi, Junil Arfianti, Fina Arif, Chandra Armansyah Armansyah Arwizet Arwizet, Arwizet Aspar, Fathir Aswardi Aswardi Azis, Ismail Berliansyah, Aqilvin Budi Syahri Chandra, Rofi Dedy Irfan Delima Yanti Sari Dinul, Fadhilah Ikhsan Donny Fernandez Dori Yuvenda Edidas , Edidas Efrianova, Vivi Elfi Tasrif Erizon, Nelvi Fadhilah Fadhilah Fadhli Ranuharja Fadillah, Egi Fadillah, Fikri Fahmi Rizal Fahrezi, Muhammad Shadiq Fani Keprila Prima Fauza, Anna Niska Febri Prasetya Ferdiansyah, Ferdiyansyah Fernanda, Firza Fiandra, Y A Fiki Efendi Firdaus, Jeri Rizal Firdaus, Novemli Fitrah Qalbina Ganefri . Giatman, M Gusnita, Wiwik Hadi Kurnia Saputra Hafis, M Hamdani Hamdani Hamizum, Bestra Haris, Zainal Abdul Hasan Maksum Herisvan Hendra Hilman, Antoni Ika Parma Dewi Indarta, Yose Irzal, Irzal Jalinus, N Jalius, Nizwardi Jasman Jasman Junil Adri Kamil, Fadhil Muhammad Kandena Putra, Tegar KRIKORIAN, MIHAEL Le, Sai Kham Lili Dasa Putri Maiyana, Efmi Mardizal, Jonni Maulana, Fajar Muhammad Anwar Mulianti Murni Astuti Muskir, Mukhlidi Mustakim, Waradzi Nanda, Iffarial Nasution, Yeni Puspitasari Nizwardi Jalinus Novendra, Alan Novrita, Sri Zulfia Nurdin Hendri Nurmansyah, Ridho Pepito, Ma Leona Maye B. Prasetyo, Vicky Primandari, Sri Riski Putri Primawati Primawati, Primawati Purwantono, Purwantono Putra, Dino Adi Putra, Meiyaldi Eka Putra, Randi Purnama Rahma Putri, Nadia Suci Rahmadani, Ade Fitri Ramli Ramli Randa Afabek Remon Lapisa Rifelino Rifelino Riki Saputra, Riki Rini Widyastuti Rozandi, Azel Saputra, Firman Omni Sari, Adha Kurnia Sefriani, Rini Sidiq, Ahmad Halim Sri Rizki Putri Primandari sudiani, yoni Syahril Syahril Syamsu, Azhari Tamara, Yolanda Ta’ali, Ta’ali Unung Verawardina, Unung Usmeldi Usmeldi Utari, Nadia Wagino Waradzi Mustakim Waskito Waskito, Waskito Winda Lestari Siregar Yolli Fernanda Yuberta, Andre Yufrizal Yufrizal, Yufrizal Yulnafatmawita Yulnafatmawita

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