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Jurnal Pendidikan Teknik Mesin Undiksha
Published by Universitas Pendidikan Ganesha
ISSN : 26141876     EISSN : 26141884     DOI : http://dx.doi.org/10.23887/jjtm.v7i1.18616
Core Subject : Education, Engineering,
Automotive Engineering Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Pendidikan Teknik Mesin, adalah jurnal ilmiah yang diterbitkan oleh Jurusan Pendidikan Teknik Mesin, Fakultas Teknik dan Kejuruan, Universitas Pendidikan Ganesha. Jurnal ini bertujuan untuk mewadahi artikel-artikel hasil penelitian dan hasil pengabdian masyarakat dibidang pendidikan dan pembelajaran teknik. Pada akhirnya Jurnal ini dapat memberikan deskripsi tentang perkembangan ilmu pengetahuan dan teknologi di bidang pendidikan teknik mesin bagi masyarakat akademik. Jurnal ini terbit 3 kali setahun.
Arjuna Subject : Umum - Umum
Articles 16 Documents
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Search results for , issue "Vol. 13 No. 2 (2025)" : 16 Documents clear
UPAYA SEKOLAH DALAM PENERAPAN KESELAMATAN DAN KESEHATAN KERJA (K3) DI BENGKEL PEMESINAN SMK NEGERI 2 MUARA ENIM: School Efforts In Implementing Occupational Safety And Health (Osh) In The Machine Shop Of Smk Negeri 2 Muara Enim Agustri, Adytia; Nopriyanti
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.101043

Abstract

This research aims to determine how schools implement Occupational Safety and Health (OSH) in the machining workshop of SMK Negeri 2 Muara Enim. This research is a naturalistic study, with data collection techniques using in-depth interviews. The data sources for this research employed snowball sampling techniques, starting with the head of the machining workshop and the machining teachers. Data analysis in this study used the Miles, Huberman & Saldana data analysis model with the assistance of Nvivo 12 Pro software. The results of this study indicate that SMK Negeri 2 Muara Enim shows serious efforts in implementing Occupational Safety and Health (OSH), particularly in the machining workshop through OSH training, OSH culture, routine maintenance, and the provision of adequate facilities.
Pengaruh Variasi Lebar Ban Terhadap Efisiensi Dan Konsumsi Energi Pada Kendaraan Listrik: The Effect of Tire Width Variations on Efficiency and Energy Consumption in Electric Vehicles Lastika, I Gusti Kadek Dodi; I Made Mara; I Dewa Ketut Okariawan
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.101804

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh variasi lebar ban terhadap konsumsi energi dan efisiensi energi pada kendaraan listrik prototipe. Metode eksperimen dilakukan menggunakan tiga variasi lebar ban: 1.75 × 16 – 1.75 × 20 inci, 2.25 × 16 – 2.25 × 20 inci, dan 2.50 × 16 – 2.30 × 20 inci. Pengujian dilakukan pada malam hari dengan lintasan aspal sepanjang 6,7 km, menggunakan teknik eco-driving untuk memastikan konsumsi energi yang efisien. Data konsumsi energi (Wh/km) dan efisiensi energi (km/Wh) diukur menggunakan joulemeter. Hasil pengujian menunjukkan bahwa lebar ban memengaruhi konsumsi energi dan efisiensi energi secara signifikan. Ban berukuran 1.75 × 16 – 1.75 × 20 inci memberikan konsumsi energi terendah sebesar 24,9 Wh/km dengan efisiensi energi 0,040 km/Wh, sedangkan ban berukuran 2.50 × 16 – 2.30 × 20 inci memiliki konsumsi energi tertinggi sebesar 43,5 Wh/km dengan efisiensi energi 0,022 km/Wh. Temuan ini menegaskan bahwa pemilihan lebar ban yang tepat dapat meningkatkan efisiensi daya pada kendaraan hemat energi, terutama untuk kategori prototipe. This study aims to analyze the effect of tire width variation on energy consumption and energy efficiency in a prototype electric vehicle. The experimental method was carried out using three tire width configurations: 1.75 × 16 – 1.75 × 20 inches, 2.25 × 16 – 2.25 × 20 inches, and 2.50 × 16 – 2.30 × 20 inches. Tests were conducted at night on a 6.7 km asphalt track using an eco-driving technique to ensure efficient energy consumption. Energy consumption (Wh/km) and energy efficiency (km/Wh) were measured using a joulemeter. The results showed that tire width significantly affects energy consumption and energy efficiency. The 1.75 × 16 – 1.75 × 20 inch tire configuration yielded the lowest energy consumption of 24.9 Wh/km with an energy efficiency of 0.040 km/Wh, while the 2.50 × 16 – 2.30 × 20 inch tires recorded the highest energy consumption of 43.5 Wh/km with an efficiency of 0.022 km/Wh. These findings emphasize that proper tire width selection can enhance power efficiency in energy-efficient vehicles, particularly for prototype categories.
Pengaruh Submergence Ratio dan Debit Udara Terhadap Performa Airlift Pump Dua Fase Dengan Sudut Injektor 30o: Effect of Submergence Ratio and Air Flow Rate on the Performance of a Two-Phase Airlift Pump with a Injector Angle 30° Muchammad Insan Brilian; Nurmala Dyah Fajarningrum; Nur Hayati
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.101916

Abstract

The airlift pump is a device used to lift a mixture of liquid and solid particles through a vertical pipe and is capable of continuous operation. This device serves as a cost-effective solution for water lifting applications and is resistant to solid particles that may otherwise damage conventional pump components. This study aims to evaluate the performance of a two-phase airlift pump based on variations in submergence ratio and injected air flow rate. The main focus is to examine the effects of these parameters on water discharge, the resulting flow patterns, efficiency, and effectiveness of the airlift pump. Experiments were conducted using submergence ratios of h, h, and h, and air flow rates of 30 lpm, 40 lpm, 50 lpm, and 60 lpm. The test results show that increasing the submergence ratio and air flow rate leads to an increase in water discharge and efficiency up to a certain point, after which both values begin to decline. The highest efficiency and effectiveness were recorded at an air flow rate of 40 lpm with a submergence ratio of h, yielding an efficiency of 3.34% and an effectiveness of 888.60. However, once the pump reaches its peak performance, further increases in air flow rate lead to a decrease in overall performance. The observed flow patterns include bubbly, slug, and churn flow. The bubbly flow pattern typically appears at the tail end of slug flow. The results also indicate that higher submergence ratios and air flow rates produce higher water discharge, greater efficiency, and improved effectiveness of the airlift pump.
The Analysis of the Effect of Gate Valve Leakage on Piping Systems Using the Lapping Repair Method: Analisis Pengaruh Kebocoran Gate Valve Pada Sistem Perpipaan Menggunakan Metode Perbaikan Lapping M. Roekhanum Majid; Mohammad Anshori; Pelangi Eka Yuwita
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

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

Abstract

Gate valve merupakan komponen penting dalam sistem perpipaan industri yang berfungsi mengatur dan menghentikan aliran fluida. Seiring waktu, penggunaan yang terus-menerus dapat menyebabkan kerusakan pada permukaan gate dan seat, seperti aus dan korosi, yang mengakibatkan terjadinya kebocoran internal. Penelitian ini bertujuan untuk menganalisis seberapa efektif perbaikan menggunakan metode lapping dapat mengurangi tingkat kebocoran pada gate valve, serta mengevaluasi kinerja melalui simulasi menggunakan perangkat lunak Autodesk Inventor. Metode lapping diterapkan untuk menghaluskan dan meratakan permukaan yang rusak agar fungsi gate valve dapat kembali optimal. Pengujian dilakukan dengan metode hydrotest untuk mengukur tingkat kebocoran secara langsung, serta simulasi tekanan dengan variasi tekanan antara 500 psi hingga 3000 psi. Hasil penelitian menunjukkan bahwa perbaikan dengan metode lapping secara signifikan mampu mengurangi kebocoran internal, yang terlihat pada hasil uji langsung maupun visualisasi simulasi. Analisis statistik menggunakan uji paired t-test menunjukkan terdapat perbedaan yang signifikan antara kondisi sebelum dan sesudah perbaikan.   Gate valves are essential components in industrial piping systems that regulate and stop fluid flow. Over time, continuous use can cause damage to the gate and seat surfaces, such as wear and corrosion, resulting in internal leaks. This study aims to analyze the effectiveness of repairs using the lapping method in reducing gate valve leakage levels, and evaluate performance through simulations using SolidWorks Flow Simulation software. The lapping method is applied to smooth and level the damaged surface so that the gate valve can function optimally again. Tests were conducted using the hydrotest method to directly measure the leakage level, as well as fluid flow simulations with pressure variations between 500 psi and 3000 psi. The results showed that repairs using the lapping method were significantly able to reduce internal leaks, as seen in the results of direct tests and simulation visualizations. Statistical analysis using a paired t-test showed a significant difference between the conditions before and after repair.
Analisis Pengaruh Variasi Panjang Header Knalpot terhadap Performa Motor Manual 100cc dengan Metode Kruskal-Wallis: Analysis of the Effect of Exhaust Header Length Variations on the Performance of a 100cc Manual Motorcycle with Kruskal-Wallis Method Jhony Langgeng Baruna Wirawan; I Wayan Purnayasa
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

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

Abstract

This study investigates the effect of varying exhaust header length on the engine performance of a 100cc manual motorcycle using a non-parametric statistical approach. Three header lengths (30 cm, 45 cm, and 60 cm) were evaluated. Performance indicators assessed included torque, power (horsepower), and specific fuel consumption (SFC), measured at five engine speed settings: 3000, 3500, 4000, 4500, and 5000 rpm. Torque and power measurements were performed using a dynamometer (dynotest), while fuel consumption was recorded using a flowmeter. For data analysis, the Kruskal–Wallis test was applied, as preliminary Shapiro–Wilk and Levene tests indicated that the dataset did not meet the assumption of normality. Statistical results indicate that exhaust header length has a significant effect on torque and fuel consumption at all tested rpm levels. Power output also exhibits significant variation, especially at medium to high engine speeds. Among the configurations tested, the 45 cm header consistently delivered the best overall performance, producing the highest torque and power while achieving the most efficient fuel consumption. These findings highlight the critical role of optimal exhaust header design in maximizing the efficiency and performance of small-displacement motorcycle engines.
Pengaruh Metode Fabrikasi terhadap Kekuatan Tarik Komposit Serat Cordyline Australis: The Effect Of Fabrication Method On The Tensile Strength Of Cordyline Australis Fiber Composites Ida Bagus Putu Purwadnyana; Tjokorda Gde Tirta Nindhia
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.102758

Abstract

This study aims to investigate the effect of fabrication methods on the tensile strength of epoxy composites reinforced with untreated Cordyline australis fibers. Two fabrication methods were compared: closed hand lay-up and vacuum chamber. The fiber weight fractions used were 1%, 2%, and 5%. Tensile tests were conducted according to ASTM D638, and morphological characteristics were examined through surface and fracture micrograph analysis. The results show that the hand lay-up method consistently produced higher tensile strength compared to the vacuum method across all fiber fractions. The highest tensile strength was achieved at 2% fiber fraction using the hand lay-up method, reaching 26.91 MPa, while the vacuum method only reached 21.11 MPa. At 5% fiber content, the vacuum method experienced a significant drop in tensile strength to 12.34 MPa, indicating its ineffectiveness at higher fiber loadings without treatment. Micrographic analysis revealed that the vacuum method tended to produce voids and resin-poor areas around the fibers. These findings confirm that fabrication method has a significant influence on the mechanical performance of the composite, and that the hand lay-up method is more suitable for natural fiber-based composites without additional treatments.

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