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PEMANFAATAN SAMPAH BIOMASSA MENJADI BRIKET SAMPAH BIOMASSA: - Salman, salman; Okariawan, I Dewa Ketut; Setyawan, Paryanto Dwi
Jurnal Bakti Nusa Vol. 5 No. 1 (2024): JURNAL BAKTI NUSA
Publisher : Jurusan Teknik Elektro Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/baktinusa.v5i1.125

Salah satu cara pemanfaatan sampah biomassa adalah dengan mengolahnya menjadi briket sampah biomassa. Karena itulah dalam kegiatan pengabdian masyarakat ini tim pelaksana pengabdian melakukan diseminasi alat pencacah sampah organic sekaligus pembimbingan pembuatan briket sampah biomassa di depan kelompok tani di Lingkungan Batu Ringgit Selatan, Kelurahan Tanjung Karang, Kecamatan Sekabela, Kotamadya Mataram. Saat ini kelompok tani tersebut belum memanfaatkan sampah biomassa yang tersedia secara melimpah disekitar mereka. Pelaksanaan dari kegiatan pengabdian ini meliputi pengadaan alat pencacah sampah organik, pembimbingan pembuatan briket sampah organik, dan produksi briket. Hasil pembuatan briket sampah biomassa ini bisa ditawarkan kepada konsumen skala rumah tangga dan industri. Mesin pencacah sampah organik dibuat memiliki inovasi produk karena starter tidak menggunakan handle tali melainkan switch on off elektrik selain itu input material biomassa dilengkapi pisau sehingga serat biomassa tidak melilit di poros saat mesin beroperasi.

Karakterisasi Produk Metalurgi Serbuk Berbahan Limbah Aluminium Paduan dan Kaca Alit Triadi, Anak Agung; Okariawan, I Dewa Ketut; Nursaid, Nursaid
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 3 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i3.665

Aluminum alloy and glass waste is often found in the business of making display racks. It is necessary to do research on the utilization of waste into useful products. This study aims to determine the hardness and compressive strength of objects made of a mixture of aluminum alloy and glass using the powder metallurgy method. The first stage was making aluminum and glass powders up to 100 mesh in size, the next stage was mixing the powders (mixing) with time variations of 70 minutes, 80 minutes and 90 minutes with a composition of 80% aluminum and 20% glass. Then manufacture of specimens with a compaction load of 8 tons. Furthermore, the sintering process at a temperature of 500 oC with time variations of 60 minutes, 90 minutes and 120 minutes, then tested hardness and compressive strength. The results obtained from the hardness test and compressive strength test showed the highest value for the test object with variations in the stirring time and sintering time of 90 minutes. Based on the two-way ANOVA analysis, the mixing time and sintering time obtained the values of Fcount>Ftable, so that the mixing time and sintering time have a significant effect on hardness and compressive strength.

Analisis Jangkauan Kendaraan Listrik Menggunakan Teknik Regresi Studi Kasus Kendaraan Listrik Universitas Mataram Mabrur, Muh. Hijjul Mabrur; Okariawan, I Dewa Ketut; I Made , Mara
Jurnal Teknik Mesin Mechanical Xplore Vol 5 No 2 (2024): 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.v5i2.8861

The development of electric vehicles (EV) represents a strategic approach to reducing carbon emissions and decreasing reliance on fossil fuels. This study analyzes the driving range of electric vehicles at the University of Mataram using regression techniques to examine the relationship between vehicle load, energy consumption, and range efficiency. Field tests were conducted under various vehicle load conditions (120.5 kg, 130.5 kg, and 140.5 kg) and gear ratio variations. A linear regression analysis was applied to determine the influence of independent variables (vehicle load and gear ratio) on the dependent variables (energy consumption and driving range). The results indicate a positive correlation between vehicle load and energy consumption, alongside a negative correlation with driving range. Specifically, at a load of 120.5 kg, energy consumption was recorded at 29.29 Wh/km, achieving a maximum range efficiency of 82.82 km per kWh. In contrast, at 140.5 kg, energy consumption increased to 44.00 Wh/km, while range efficiency declined to 54.56 km per kWh. Additionally, gear ratio variations significantly affected vehicle performance, with a gear ratio of 10.29 yielding the highest range efficiency of 112.55 km per kWh, whereas a gear ratio of 6.43 exhibited lower efficiency. These findings emphasize the critical role of vehicle load management and optimal gear ratio selection in enhancing energy efficiency. The study provides valuable insights for the design and development of more efficient and sustainable electric vehicles, contributing to advancements in EV technology.

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

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

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.

Analisis Jangkauan Kendaraan Listrik Menggunakan Teknik Regresi Studi Kasus Kendaraan Listrik Universitas Mataram Mabrur, Muh. Hijjul Mabrur; Okariawan, I Dewa Ketut; I Made , Mara
Jurnal Teknik Mesin Mechanical Xplore Vol. 5 No. 2 (2024): 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.v5i2.8861

The development of electric vehicles (EV) represents a strategic approach to reducing carbon emissions and decreasing reliance on fossil fuels. This study analyzes the driving range of electric vehicles at the University of Mataram using regression techniques to examine the relationship between vehicle load, energy consumption, and range efficiency. Field tests were conducted under various vehicle load conditions (120.5 kg, 130.5 kg, and 140.5 kg) and gear ratio variations. A linear regression analysis was applied to determine the influence of independent variables (vehicle load and gear ratio) on the dependent variables (energy consumption and driving range). The results indicate a positive correlation between vehicle load and energy consumption, alongside a negative correlation with driving range. Specifically, at a load of 120.5 kg, energy consumption was recorded at 29.29 Wh/km, achieving a maximum range efficiency of 82.82 km per kWh. In contrast, at 140.5 kg, energy consumption increased to 44.00 Wh/km, while range efficiency declined to 54.56 km per kWh. Additionally, gear ratio variations significantly affected vehicle performance, with a gear ratio of 10.29 yielding the highest range efficiency of 112.55 km per kWh, whereas a gear ratio of 6.43 exhibited lower efficiency. These findings emphasize the critical role of vehicle load management and optimal gear ratio selection in enhancing energy efficiency. The study provides valuable insights for the design and development of more efficient and sustainable electric vehicles, contributing to advancements in EV technology.

ANALISA SISTEM KENDALI MEKANIK UNTUK PENGEMBANGAN KENDARAAN LISTRIK AUTONOMOUS FAKULTAS TEKNIK UNRAM Okariawan, I Dewa Ketut; Syahrul; Alit, Ida Bagus; Nuarsa, I Made; Suartika, I Made
Energy, Materials and Product Design Vol. 2 No. 1 (2023): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Mataram

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

Currently, the vehicles that are commonly used are vehicles with fossil fuels, but we all know that these fuels are non-renewable fuels and their availability in nature is very limited, so it is necessary to innovate to use other renewable energy sources. one of which is electrical energy. Besides that, the use of electrical energy for vehicles is currently very relevant because of its relatively high efficiency and friendly to the environment, namely no CO or CO2 gas is formed as in conventional vehicles. Indonesia has the potential to develop electric cars because there is a lot of nickel available to be processed into batteries. Thus, our country has a very large opportunity to produce electric cars. To realize this, it is deemed necessary to conduct a thorough study such as the level of comfort and safety. Thus, it is needed to conduct a study of the mechanical control system so that driving comfort and safety can be achieved. In this research, we will measure the turning radius of the vehicle at various TOE angles. The resulth of this study are the greater of TOE angle produce the higer the turning radius of the vehicle, The smallest turning radius is at a TOE angle 0 degrees which is 4.42 meters and the largest at a TOE angle 1.035 degrees which is 4.53 meters.

ANALISA SISTEM ELEKTRONIK POWER STEERING UNTUK PENGEMBANGAN KENDARAAN LISTRIK FAKULTAS TEKNIK UNRAM Okariawan, I Dewa Ketut; Made Wirawan; Bawa Susana, I G.; Maharsa Pradityatama
Energy, Materials and Product Design Vol. 3 No. 1 (2024): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Mataram

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

Recenly conventional vehicles use fossil fuels, however these fuels are non-renewable energy sources and their availability in nature is very limited. If they are explored continuously then one day they will run out, so it is very necessary to save and innovate to use these sources. Other renewable energy sources, one of which is electrical energy, where this electrical energy can be generated from various sources such as water, solar, biomass and so on. Besides that, the use of electrical energy for vehicles is currently very relevant because it is environmentally friendly, that is, it does not produce CO or CO2 gas like conventional vehicles, so this energy is known as green energy. Indonesia has the potential to produce electric cars because the availability of nickel is very abundant to be processed into batteries, as a provider or energy storage for electric cars, our country has a very big opportunity to produce electric cars. To make this happen, it is deemed necessary to carry out comprehensive studies such as power steering so that comfort and safety can be achieved. The most suitable power steering is the electric power steering (EPS) type because the energy required comes from the battery. The method applied in this research is an experimental method, by measuring torque requirements on various roads, the roads chosen are asphalt roads, block paving roads and dirt roads. Based on this data, an EPS test bench then created which was able to measure the input and output torque of the EPS and look for the power consumed by the system. Road conditions can cause differences in torque requirements, in block paving road conditions the greatest torque requirement is 2.77 Nm and the smallest occurs in asphalt road conditions at 1.62 Nm. EPS testing shows that it is only loaded up to 25% with an input torque of 1,652 Nm resulting an output torque of 3,924 Nm with an electrical power consumption of 6,31 watts.

STUDY PENGEREMEN PADA MOBIL LISTRIK HASIL MODIFIKASI Triadi, A.A. Alit; Zainuri, Achmad; Suartika, I Made; Sayoga, I Made Adi; Mara, I Made; Okariawan, I Dewa Ketut
Energy, Materials and Product Design Vol. 3 No. 1 (2024): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Mataram

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

Every three accidents occur every hour in Indonesia, according to the Director of Road Traffic at the Ministry of Land Transportation, with a percentage of over 50-70 percent and 30 percent of accidents occur due to poor performance of the brake system. Accidents occur due to insufficient braking distance and lack of understanding of the braking characteristics of the vehicle being driven. The aim of this research is to analyze the distance, time and braking force required for an electric car to move until it stops with variations in speed and vehicle load. This research was carried out using an experimental method where a prototype electric car was run by varying the speed and load of the vehicle to obtain braking time and distance and analyzing the data obtained. The shortest braking distance at a speed of 20 km/hour with a vehicle load of 950 kg is 4.39 meters. The longest braking distance is 14.78 meters at a speed of 40 km/hour with a vehicle load of 1050kg. The fastest braking time is at a speed of 20 km/hour with a vehicle load of 950 kg, namely 1.97 seconds. The longest braking time was at a speed of 40 km/h with a vehicle load of 1050 kg, namely 2.76 seconds. The smallest braking force is at a speed of 20 km/hour with a vehicle load of 1050 kg, namely 2098.36 N. The largest braking force is at a speed of 40 km/hour with a vehicle load of 950 kg, namely 4132.65 N.

KARAKTERISTIK GETARAN DALAM BENTUK WAVEFORM DAN SPEKTRUM MELALUI TRANSFORMASI FOURIER Salman; Okariawan, I Dewa Ketut; Nurchayati; Mulyanto, Arif; Sulistyowati, Emmy Dyah
Energy, Materials and Product Design Vol. 4 No. 2 (2025): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/enatq908

The analysis of machine vibration is therefore essential for predictive maintenance and condition monitoring. Modern approaches, ranging from time-domain measurements of acceleration, velocity, and displacement to frequency-domain and modal analysis. This study investigates the vibration characteristics of rotating equipment in a manufacturing environment, focusing on identifying dominant frequencies, evaluating amplitude trends, and assessing overall machine condition. Data collected from accelerometers mounted on a centrifugal pump were processed using time-domain and frequency-domain techniques. The results highlight clear signatures of imbalance and bearing wear, demonstrating the value of predictive maintenance based on vibration monitoring. As the result the amplitude–frequency spectrum demonstrates that the machine is primarily influenced by rotational imbalance, with minimal evidence of high-frequency faults.

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