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All Journal Jurnal Penelitian Saintek Jurnal Teknik ITS Jurnal Bahan Alam Terbarukan Jurnal Pendidikan Teknik Mesin Lembaran Ilmu Kependidikan Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Sainteknol : Jurnal Sains dan Teknologi Automotive Science and Education Journal Journal of Mechanical Engineering Learning REiD (Research and Evaluation in Education) Jurnal Pengabdian Magister Pendidikan IPA Jurnal Teknik Mesin Indonesia Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal Inovasi Pembelajaran Karakter Journal of Vocational and Career Education Jurnal Pendidikan Vokasi Otomotif Dedikasi: Jurnal Pengabdian kepada Masyarakat JURNAL REKAYASA KIMIA & LINGKUNGAN Jurnal MEKOM: Media Komunikasi Pendidikan Kejuruan Advance Sustainable Science, Engineering and Technology (ASSET) Jurnal Penelitian Pendidikan Journal of Vocational and Career Education Journal of Mechanical Engineering Learning Jurnal Pendidikan Teknik Mesin Automotive Science and Education Journal
Dwi Widjanarko
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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CFD Simulation of Flame Characteristics Resulting from Volatile Matter Combustion of Various Biomass Pellets Ramavi Akbar Akhsanul Fitrah; Ratna Dewi Kusumaningtyas; Dwi Widjanarko; Catur Rini Widyastuti; Muslikhin Hidayat; Muhammad Aziz
Advance Sustainable Science Engineering and Technology Vol. 8 No. 3 (2026): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i3.3591

Abstract

While biomass is a promising carbon-neutral alternative to coal, the specific volatile matter (VM) flame characteristics of diverse biomass pellets, particularly water hyacinth, remain under-researched. This study uses a numerical CFD approach (Ansys Fluent) to investigate how varying VM fractions influence flame structure in a 2D planar slice of the furnace block (25 cm width). Simulations employed the SST k–ω turbulence and Eddy dissipation model to capture mixing-limited chemical reactions. Boundary conditions were based on experimental configurations using a 0.05 m/s air inlet velocity. Results using CO-based flame-tip markers revealed that water hyacinth (VM: 63.5 wt%) produced a peak temperature of ~1,400°C at 75 cm above the fuel, while rice husk and bagasse (VM: 59–77 wt%) exhibited longer, more intense hot plumes compared to the localized heat profile of coal. These findings demonstrate that biomass generates more dispersed combustion zones, aiding in furnace hot-spot prevention and air control optimization. A limitation of this study is that findings are based solely on numerical simulations without direct experimental validation, although the model replicates physical furnace configurations. These results provide a foundation for developing sustainable biomass–coal co-firing technologies.
Development of a Website-Based E-Module to Improve Student Learning Outcomes on Starter System Material at SMK Teuku Umar Ridha Al Rizqi; Bunyamin; Wahyudi; Dwi Widjanarko
JMEL : Journal of Mechanical Engineering Learning Vol. 15 No. 1 (2026): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v15.i1.30822

Abstract

This study aimed to develop and examine the feasibility and effectiveness of a website-based starter system e-module for Grade XI students in the Light Vehicle Engineering Department at SMK Teuku Umar. This study employed a research and development approach using the ADDIE model, which consists of Analyze, Design, Development, Implementation, and Evaluation stages. The effectiveness of the product was tested using a one-group pretest–posttest design involving 29 Grade XI TKR 1 students. The instruments used in this study included expert validation sheets, learning outcome tests, and a student response questionnaire. The feasibility test involved two media experts and two subject matter experts. The results showed that the developed e-module was categorized as very feasible, with validation scores of 92.36% from media experts and 91.66% from subject matter experts. The learning outcome test showed that students’ mean score increased from 47 in the pretest to 76 in the posttest. The paired-sample t-test indicated a significant improvement in students’ learning outcomes, with tcount = 18.36, which was higher than ttable = 2.048. The N-Gain score was 0.5582, or 55.82%, indicating a moderate level of effectiveness. Student responses reached 85%, categorized as very positive. Therefore, the website-based starter system e-module is feasible and moderately effective for supporting starter system learning. However, this study was limited to one class and did not involve a control group; therefore, broader trials with comparison groups are recommended.
Development of interactive learning media using smart apps creator on electrical system of light vehicles in vocational high schools Sofyan Al Farouqi; Hadromi; Dwi Widjanarko
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.31176

Abstract

This study aims to develop and evaluate the feasibility and effectiveness of interactive learning media based on Smart Apps Creator (SAC) for the topic of lighting and signaling systems in light vehicles, intended for Grade XI students of the Light Vehicle Engineering Program at SMK Negeri 2 Salatiga. The background of this research stems from low student achievement and the limited use of engaging instructional media at SMK N 2 Salatiga, which has resulted in students having difficulty understanding the electrical system material. This study employed a Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The developed media underwent validation by subject matter experts and media experts, receiving "highly feasible" ratings with feasibility percentages of 90.25% from the media expert and 88% from the subject matter expert. The effectiveness was tested through pretest and posttest evaluations analyzed using the N-Gain test. The N-Gain score from 34 students yielded an average of 0.324, which falls into the "moderate" category. It can thus be concluded that the learning media based on Smart Apps Creator provided to students is moderately effective in improving their learning outcomes.
The Effect of Stroke Up with Ignition Timing Variations on The Programmable CDIon The Engine Performance of The Gl Pro Neotech Motorcycle in 1997 Iqbal Aditya Nugraha; Dwi Widjanarko
JMEL : Journal of Mechanical Engineering Learning Vol. 15 No. 1 (2026): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v15.i1.31207

Abstract

Stroke-up modification and ignition timing adjustment are commonly used to improve motorcycle engine performance, yet their combined effect requires controlled empirical verification. This study examined the effect of a stroke-up crankshaft combined with programmable CDI ignition timing variations on compression pressure, torque, and power output of a GL Pro Neotech 160 cc motorcycle. Methods: A quantitative true-experimental method was applied through engine performance testing under controlled workshop conditions. The standard crankshaft was compared with a stroke-up crankshaft, while ignition timing was adjusted to 15°, 16°, and 17° before top dead center using a programmable CDI. Primary data were obtained from compression tests and chassis dynamometer measurements across 5000–10000 rpm, then analyzed descriptively using average values, tables, and performance graphs. Results: The stroke-up modification increased compression pressure from 12.43 bar to 15.67 bar, equivalent to a 26.1% increase. The 15° timing produced strong low-to-medium speed torque, while the 16° stroke-up configuration showed the most stable and superior performance at medium-to-high engine speeds, reaching 16.71 Nm at 6000 rpm and peak power around 7000 rpm. Conclusion: Stroke-up modification combined with 16° ignition timing is the most effective configuration for improving motorcycle engine performance under the tested operating conditions and rpm range.
EFEKTIVITAS PENGGUNAAN MULTIMEDIA SISTEM PENGISIAN ELEKTRONIK DALAM PEMBELAJARAN KELISTRIKAN OTOMOTIF BAGI CALON GURU SEKOLAH MENENGAH KEJURUAN : EFEKTIVITAS PENGGUNAAN MULTIMEDIA SISTEM PENGISIAN ELEKTRONIK DALAM PEMBELAJARAN KELISTRIKAN OTOMOTIF BAGI CALON GURU SEKOLAH MENENGAH KEJURUAN Dwi Widjanarko; Abdurrahman; Supraptono
Jurnal MEKOM (Media Komunikasi Pendidikan Kejuruan) Volume 2, Issue 1, Februari 2015
Publisher : Fakultas Teknik, Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini bertujuan untuk meneliti keefektifan penggunaan multimedia sistem pengisian elektronik dalam pembelajaran bagi calon guru Sekolah Menengah Kejuruan (SMK). Penelitian ini adalah penelitian kuasi eksperimen dengan model single group pretest-posttest design. Populasi dalam penelitian ini adalah seluruh mahasiswa Program Studi Pendidikan Teknik Otomotif, dan sebagai sampel adalah mahasiswa yang mengambil mata kuliah Teori Kelistrikan Otomotif pada semester ganjil 2014-2015sebanyak 40 mahasiswa. Hasil penelitian menunjukkan bahwa hasil belajar setelah menggunakan multimedia sistem pengisian elektronik lebih baik dan berbeda signifikan dibandingkan sebelum menggunakan multimedia sistem pengisian elektronik. Kenaikan mencapai 29,35 poin atau mencapai 70%, sehingga penggunaan multimedia sistem pengisian elektronik adalah efektif.
Co-Authors - Abdurrahman  - Basyirun - Khusen  - Pramono  - Rusiyanto  - Wahyudi  Abdurahman Abdurrahman Abdurrahman Abdurrahman Abdurrahman Abdurrahman , - Adhi Kusumastuti Adi Nova Trisetiyanto Ahmad Afwan Fathoni Ahmad Ihwan Akbar, Muhammad Hafizt Aldika Mosya Saputra Alfira Dwi Febrianti Ali Djamhuri Alvin Maulana Al Bahri Andi Irawan Andyka Rahmawan, Andyka Ardhiyanto Rizaldi Ardita, Ardita Ari Dwi Nur Indriawan Musyono Ashroful In'am Bambang Haryadi Basyirun , Basyirun Budiman, Febrian Arif Bunyamin Bunyamin Bunyamin Catur Rini Widyastuti Catur Rini Widyastuti, Catur Rini Childa Kumala Azzahri, Childa Kumala Cholifah, Ayu Danang Wahyu Pratama, Danang Wahyu David Badi’ul Chikam Dewi Kartikasari Doni Yudi Irawan Dwi Rahmad Setiyono Dzikie Agung Prasetyo, Dzikie Agung Edy Ismail Eko Budi Utomo Eldiana, Ii Faizal Fakhri, Faizal Fathoni, Ahmad Afwan Fathu Rahman  Wahid Fauzi, Yoyon Febrian Arif Budiman Febrianti, Alfira Dwi Hadromi Hadromi - Hadromi Hadromi Handri Rama Pradani Hanif Hidayat Hanna Lestari Hariyahya Arfidiansyah, Hariyahya Heri Yudiono Herman Dwi Surjono Herminarto Sofyan I Made Sudana Iqbal Aditya Nugraha Irene Nindita Pradnya J, Kuswidyaningrum N. Karend, Khanza Azizah Abas Khabiburrahman, Khabiburrahman Khabiburrahman, Khabiburrahman Khumaedi, Muhammad Khumaedi Khusaeni Khusaeni Khusen , - Kresnadi, Muh. Elvio Putra Lestari, Iga Mawarni Ayu Maria, Yesicha mashudi, ali Mashudi, Ali Moch. Taufiq Ichsan Mohamad Aji, Mohamad Monelis Widyatama, Monelis Mudinillah, Adam Muhamad Sa’dullah, Muhamad Muhammad Arrry Yanto Muhammad Aziz Muhammad Ikhwan Rifqi Muhammad Khumaedi Mushthofaina Al Akhyar, Zidane Muslikhin Hidayat Mu’daim, Syarifah Nadya Alfa Cahaya Imani Novia Restu Windayani, Novia Restu Nur Fitriyanto, Joko Nur Qudus Oddie Febriyono, Oddie Pramono Pramono Pramono , - Putri, Firta Firdauzia Rakim, Rakim Ramavi Akbar Akhsanul Fitrah Ratna Dewi Kusumaningtyas Ratna Dewi Kusumaningtyas Ratna Wardani Ridha Al Rizqi Rini Kusumawardani Rini Kusumawardani, Rini Rodia Syamwil rohayati rohayati Rosyid, Arif Rusiyanto , - Samsudi . Samsudin Anis Saptariana Saratri Wilonoyudho SATRIA, ANAS Setiyono, Dwi Rahmad Sigit Bayu Aji Sofyan Al Farouqi Sonika Maulana Sri Endah Wahyuningsih Sucihatiningsih DWP Sudarman Sudarman Sudiyono Sugiyono . Sukoco, Imam Sunarto Sunarto Supraptono Supraptono Supraptono, Supraptono Supraptono, Supraptono Syifa Azzahra Tahroni Tahroni, Tahroni Taka, Buyung Iman Utomo, Eko Budi Valentinus Arsfendi Fernando Wahid, Fathu Rahman  Wahyudi Wahyudi Wahyudi Wahyudi Wahyudi Wahyudi , - Widi Widayat Widiastuti, C. Tri Widyastuti, Ratna Tri Winarno Dwi Rahardjo Winarno Dwi Rahardjo, Winarno Dwi Wirawan, Mohammad Arif Yeri Sutopo Zulaekah, Dewi