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All Journal Rotasi Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Dielektrika : Jurnal Ilmiah Kajian Teori dan Aplikasi Teknik Elektro Jurnal Abdi Insani Jurnal Pendidikan Teknik Mesin Undiksha Jurnal Teknik Mesin Mechanical Xplore Jurnal Bakti Nusa IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Jurnal Karya Pengabdian Teknik Mesin Energy, Materials and Product design Jurnal Wicara Desa
I Made Mara
Mataram University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture 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 Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences

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The Effect Of Gear Ratio Variations And Vehicle Weight On Energy Efficiency In Electric Prototype Vehicles Of The Engineering Faculty Of Mataram University Bima, Rangga; Mara, I Made
ROTASI Vol 27, No 1 (2025): VOLUME 27, NOMOR 1, JANUARI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.1.23-28

Abstract

Electric vehicles are vehicles that are driven by electric motors using electrical energy derived from battery energy sources. Like most other electric vehicles, electric prototype vehicles are also controlled using throttle pedals on the steering wheel and also the braking system. This study also aims to determine how much electrical energy consumption is used in the vehicle, by varying the gear ratio and vehicle weight. The test method was carried out by releasing the throttle when the vehicle reached maximum speed, with the aim of being able to produce a lower level of energy consumption with higher efficiency. Gear ratio variations used were 6.43; 7.56; 8.57; 9.08 and 10.20 and vehicle weight variations used were 120.5 kg; 130.5 kg and 140.5 kg. The results of the test show that if the smaller the gear ratio used and the heavier the load from the vehicle, the greater the energy required. The results of this study indicate that, vehicles with lighter weight and with the use of larger gear ratio variations can reduce the consumption of electrical energy used. And can increase higher energy efficiency, so as to increase the maximum mileage range of the vehicle. The findings from this study can also provide additional information and valuable insights in the development of more efficient electric vehicles in the future.
Bahan Bakar dari Limbah Ban Dan Plastik dengan Metode Pirolisis: Fuel from Waste Tires and Plastic Using the Pyrolysis Method Ida Bagus Alit; I Made Mara
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 1 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i1.83758

Abstract

Tujuan penelitian ini adalah untuk menghasilkan bahan bakar alternatif dari limbah karet dan plastik. Limbah karet yang digunakan adalah ban motor sedangkan limbah plastik yang dipakai adalah botol minuman air mineral. Metode yang digunakan untuk mengkonversi bahan tersebut adalah metode pirolisis. Bahan bakar hasil pirolisis kemudian diuji sifat fisik dan kimia yang meliputi densitas, viskositas kinematis, nilai kalor, kandungan abu dan kandungan belerang. Konversi limbah plastik menghasilkan lebih banyak bahan bakar dari pada konversi limbah karet. Densitas minyak pirolisis limbah ban lebih mendekati bahan bakar Diesel, sementara densitas minyak pirolisis plastik lebih mendekati bahan bakar bensin. Nilai kalor minyak pirolisis yang dihasilkan diatas 40 Mj/kg. kandungan abu dan timbal minyak pirolisis plastik berada dibawah batas maksimal bahan bakar Diesel maupun bensin.
PENINGKATAN LITERASI TEKNOLOGI CVT KENDARAAN RODA DUA PADA SEKEHA TERUNA TERUNI HITA SHANTI DI LINGKUNGAN GRIYA PAGUTAN INDAH MATARAM Mara, I Made; Allo Padang, Yesung; Wirawan, Made; Nuarsa, I Made; sinarep, Sinarep
Jurnal Bakti Nusa Vol. 6 No. 1 (2025): JURNAL BAKTI NUSA
Publisher : Jurusan Teknik Elektro Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/baktinusa.v6i1.140

Abstract

Continuously variable transmission (CVT) technology is currently something that is very commonly used in motorcycles for various reasons of practicality in use. This encourages the importance of CVT technology literacy in motorcycles to emerge in this context, because the CVT system has characteristics that inherently support fuel efficiency. CVT allows riders to enjoy smooth transmission ratio changes without the need for manual gear shifting. This is an advantage especially in urban traffic situations that often involve stop-and-go patterns, where the CVT system can keep the engine operating at an efficient speed. However, in order for the benefits of CVT to be felt to the maximum, riders need to understand how this technology works. CVT technology literacy includes knowledge of how to use the CVT system optimally, avoiding riding styles that can put excessive stress on the transmission, and understanding the maintenance needed to maintain CVT performance. Riders who are educated in CVT technology will apply fuel-efficient riding techniques, such as avoiding sudden acceleration or unnecessary braking, which will not only increase fuel efficiency but also extend the life of the CVT. In addition, regular maintenance, such as checking and replacing the CVT belt according to schedule, can prevent premature damage and ensure that the motorcycle continues to operate at its best performance. With adequate literacy, riders can not only save fuel and operational costs, but also support environmental sustainability by reducing emissions. Therefore, increasing public understanding of CVT technology is a strategic step to create more technologically aware and responsible motorcycle users.
SOSIALISASI DAN PELATIHAN PEMBUATAN PAKAN BERNUTRISI DENGAN METODE FERMENTASI RUMPUT GAJAH SEBAGAI UPAYA PENINGKATAN KUALITAS HEWAN TERNAK DI DESA BOROK TOYANG Mara, I Made; Sasono, Marendra; Pramana, Yoga Tri; Fitri, Imayatul; Handayani, Fitri; Pratama, Imam Akbar; Firdaus, Muhammad; Islami, Nurul Hida Wahyuni; Paramitha, Ni Ketut Rizka Widya; Saputri, Lia; Musyahadati, Shufi
Jurnal Wicara Vol 3 No 2 (2025): Jurnal Wicara Desa
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/wicara.v3i2.6735

Abstract

Borok Toyang Village, located in the West Sakra District, East Lombok Regency, has a very high potential for livestock farming, especially cattle and goats. However, farmers still face difficulties in providing high-quality feed for their livestock to ensure optimal growth and productivity. The traditional feed used reduces livestock growth and increases production costs. To address this issue, the socialization of elephant grass fermentation, a better livestock feed innovation, was carried out. This activity involves initial observation, socialization, and direct training for farmers in Borok Toyang Village. Observation was conducted to determine the condition of the farms and the feeding patterns. The training included the direct preparation of fermented feed, and socialization was provided through seminars and open discussions about the benefits of fermentation. The results of the activities show that farmers have a better understanding of the importance of innovation in providing livestock feed. It has been proven that the fermentation of elephant grass accelerates livestock growth, improves the nutritional quality of feed, and reduces dependence on expensive commercial feed. Additionally, this method helps ensure the availability of quality feed, especially during the dry season. Some farmers have expressed interest in adopting this method independently and plan to form small groups to share experiences in its implementation. Farmers in Borok Toyang Village hope to independently produce more livestock, reduce production costs, and enhance the village's economic resilience through livestock farming with this socialization and training.
PENYULUHAN TEKNIK BERKENDARA ECO RIDING SEPEDA MOTOR MATIC PADA REMAJA DI LINGKUNGAN GRIYA PAGUTAN INDAH MATARAM Mara, I Made; Padang, Yesung Allo; Sinarep, Sinarep; Wirawan, Made; Suteja, Suteja; Puad, Rae Nanda Azmi
Jurnal Abdi Insani Vol 12 No 4 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i4.2405

Abstract

Teknik mengendarai sepeda motor memiliki dampak langsung pada tingkat konsumsi bahan bakar. Berbagai aspek dalam cara mengemudi sepeda motor dapat mempengaruhi sejauh mana kendaraan dapat memanfaatkan bahan bakar dengan efisien. Akselerasi yang lembut dan bertahap membantu menghindari beban berlebih pada mesin dapat mempengaruhi konsumsi bahan bakar kendaraan. Mesin sepeda motor memiliki titik efisiensi tertinggi pada kecepatan tertentu. Berkendara pada kecepatan yang konsisten dan optimal dapat membantu mesin bekerja pada titik efisiensi yang terbaik sehingga mengurangi konsumsi bahan bakar. Selain itu, mesin yang terawat dengan baik akan memiliki efisiensi yang lebih baik. Dengan memahami dan menerapkan teknik berkendara yang hemat bahan bakar, pemilik sepeda motor dapat membantu mengoptimalkan efisiensi mesin dan mengurangi dampak lingkungan serta biaya operasional kendaraan. Secara umum, sepeda motor yang menggunakan sistem penggerak CVT cenderung memberikan konsumsi bahan bakar yang lebih efisien, terutama dalam kondisi berkendara yang berhenti dan maju secara teratur atau saat berada di dalam lalu lintas dalam kota. Memberikan pelatihan kepada pengendara mengenai teknik berkendara yang efisien atau hemat bahan bakar, seperti menghindari akselerasi yang tidak perlu dan tidak melakukan pengereman yang tiba-tiba, dapat membantu mengurangi tekanan pada sistem transmisi dan meningkatkan efisiensi bahan bakar. Dengan menerapkan teknik-teknik perawatan yang baik, pengendara dapat memastikan bahwa sepeda motor berpenggerak CVT beroperasi pada performa terbaiknya, yang pada akhirnya dapat membantu menghemat konsumsi bahan bakar. Perawatan yang teratur dan praktek terbaik tidak hanya meningkatkan keandalan sepeda motor, tetapi juga memiliki dampak positif terhadap lingkungan dan kantong pengendara melalui pengurangan biaya operasional.
Analisis Eksperimental Pengaruh Jenis Oli Terhadap Suhu dan Konsumsi Bahan Bakar Pada Sepeda Motor 4-Tak 125 cc Rahmadi, Fakhmi Caesar; Mara, I Made; Sutanto, Rudy
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 2 (2025): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i2.237

Abstract

This study analyzes the effect of oil type on exhaust gas temperature and fuel consumption in a 125cc 4-stroke motorcycle. Three kinds of SAE 10W-40 oil were used: mineral, semi-synthetic, and full synthetic. Tests were conducted at idle with varying rpm and while cruising at varying speeds. Temperature was measured using a thermo gun, while fuel consumption was measured using a burette. Results showed that full synthetic oil produced the most stable temperature and lowest fuel consumption, while mineral oil demonstrated the highest temperature and consumption, especially at high rpm. This efficiency is attributed to the chemical characteristics and thermal stability of the full synthetic oil. This study provides a novel contribution by testing a classic air-cooled motorcycle under static and dynamic conditions, thus better reflecting real-world use.
Analisis Eksperimental Pengaruh Variasi Ketinggian Dome Piston terhadap Performa Mesin 4-Tak Mahendra, Esa Ramdhan Ardi; Mara, I Made; Sutanto, Rudy
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 2 (2025): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i2.239

Abstract

Internal combustion engines remain the primary power source in transportation by converting fossil fuel energy into mechanical energy. This study examines the effect of piston dome height variations (1 mm, 3 mm, and 5 mm) on the performance of a 4-stroke 87.70 cc engine. A quantitative method was used with a rope brake dynamometer to measure torque, adequate power, fuel consumption, and SFCe, effective at engine speeds ranging from 2000 to 5000 rpm. The highest torque and power were recorded at 4000 rpm, the highest fuel consumption at 5000 rpm, and the highest SFCe at 2000 rpm for all dome height variations. As piston dome height increases, combustion chamber volume decreases, leading to lower compression ratios and reduced combustion efficiency. Therefore, piston design should be aligned with the intended focus on either efficiency or performance.
Analysis of the Influence of Transmission Systems and Vehicle Weight on the Range Capability of the Mandalika Desantara Prototype Vehicle Bima, Rangga Bima; Bima, Rangga; Mara, I Made; Okariawan, I Dewa Ketut
Jurnal Teknik Mesin Mechanical Xplore Vol. 6 No. 1 (2025): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v6i1.10276

Abstract

The development of electric vehicles (EVs) plays a vital role in reducing carbon emissions and decreasing dependence on fossil fuels. This study examines the range efficiency of the Mandalika Desantara electric prototype by investigating the impact of vehicle weight and transmission configuration on energy consumption. Experimental tests were conducted using three different vehicle weights (120.5, 130.5, and 140.5 kg) and multiple transmission ratios. The results indicate a positive correlation between vehicle weight, energy usage, and travel performance. The lowest energy consumption was recorded at 21.33 Wh for the 120.5 kg configuration, achieved at an average speed of 14.42 km/h. The highest was 46 Wh for the 140.5 kg configuration, attained at 20.00 km/h. Motor power output ranged from 113.01 W to 177.22 W, with a range efficiency varying between 0.052 km/W and 0.113 km/W. Travel times ranged from 548 seconds at a transmission ratio of 6.43 to 822 seconds at a ratio of 10.29. These findings underscore the importance of optimized weight management and transmission selection in enhancing EV performance, thereby contributing to the development of more energy-efficient and sustainable electric mobility solutions.
Analisis Pengaruh Perilaku Pengemuditerhadap Efisiensi Energi pada Kendaraan Listrik Prototipe Benoit, Fransiskus Yusdwi Benoit Toding; Mara, I Made; Okariawan, I Dewa Ketut
Jurnal Teknik Mesin Mechanical Xplore Vol. 6 No. 1 (2025): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v6i1.10452

Abstract

The development of electric vehicles as a sustainable transportation alternative is rapidly advancing, driven by the need to reduce exhaust emissions and fossil fuel consumption. The efficiency of electric vehicles is not only determined by technical components such as electric motors, batteries, and control systems, but also by the driver's behavior during operation. This study aims to analyze the influence of driver behavior on energy efficiency in a prototype electric vehicle. The test was conducted within the campus environment of Universitas Mataram on a track with various conditions, including flat roads, curves, slight inclines, and speed bumps. Three drivers participated in the experiment, each completing three driving sessions with full freedom to drive without limitations set by the researcher. The results of the study show that driving behavior has a significant impact on energy consumption. Drivers with high speeds and aggressive acceleration tend to consume more energy. In contrast, drivers who adopted efficient driving techniques were able to save energy significantly. These findings confirm that driver behavior is an important factor in the design and development of energy-efficient electric vehicles.
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.
Co-Authors A. A. Alit Triadi A.A. Alit Triadi Achmad Zainuri Agus Dwi Catur Ahmad Wardi Salim, Ahmad Wardi Allo Padang, Yesung Andrian Suci Rahmawan Arif Mulyanto, Arif Barlian Mahendra, Barlian Benoit, Fransiskus Yusdwi Benoit Toding Bima, Rangga Bima, Rangga Bima Didin F Fane, Didin F Egamiati Firman Aryanto, Firman Fitri Handayani Fitri, Imayatul hendry sakke tira I G. N. K. Yudhyadi I G.A.K Chatur Adhi W.A. I Gede Bawa Susana I Kade Wiratama I Kade Wiratama, I Kade I Made Adi Sayoga I Made Adi Sayoga, I Made Adi I Made Nuarsa, I Made I Made Suartika I Made Suartika I Made Suartika I Nyoman Wahyu Satiawan I.D.K. Okariawan Ida Bagus Alit Islami, Nurul Hida Wahyuni L. Edsona Furqan Prina, L. Edsona Furqan Lastika, I Gusti Kadek Dodi Made Wijana Made Wirawan, Made Mahendra, Esa Ramdhan Ardi Muhamad Majedi Muhammad Firdaus Muliadi Harianhady, Muliadi Musyahadati, Shufi Nur Kaliwantoro Okariawan, I Dewa Ketut Paramitha, Ni Ketut Rizka Widya Pramana, Yoga Tri Pratama, Imam Akbar Puad, Rae Nanda Azmi Rahmadi, Fakhmi Caesar Riskon Riskon, Riskon Rudy Sutanto saputri, lia Sasono, Marendra Sinarep Sinarep Sujita Sujita Suteja Suteja, Suteja Towilan Ma’bud, Towilan Tri Rachmanto Yesung Allo Padang, Yesung Allo