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Jurusan Teknik Mesin, FT, Universitas Mataram, Jl. Majapahit no. 62, Mataram, NTB, 83125, Indonesia
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Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin
Published by Universitas Mataram
ISSN : 2088088X     EISSN : 25021729     DOI : https://doi.org/10.29303/dtm.v14i1
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Mechanical Engineering Physics
The Dinamika Teknik Mesin is a peer-reviewed academic journal which publishes originally research papers or simulation/computational articles in all aspect of Mechanical Engineering such as energy conversion, materials, design and production/ manufacturing. The Dinamika Teknik Mesin publishes in two issues per volume annually appearing in June and December. Due to administrative constraints, then starting in January 2018, the Dinamika Teknik Mesin publishes the volume and issue in January and July. However, starting in 2020, the Dinamika Teknik Mesin publishes issues in April and October due to the new administration.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 452 Documents
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Implementation of sensor fusion for an anaerobic biogas digester using domestic market waste Tsulutsya, F.B.; Budiarto, H.; Romadhon, A.S.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 2 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i2.852

Abstract

Domestic market waste is ranked second as the largest producer of organic waste in several regions in Indonesia. This lack can be a valuable thing. For example, alternative energy can be made possible through organic waste, one example is biogas. Vegetable and fruit waste that is produced daily by the market has great potential to be used as a substrate for making biogas, which can later be used as an alternative energy source. By adding other substrates such as methane (CH4), which can be obtained from agricultural waste such as cow dung, which is abundantly available in various regions, these two types of waste can be processed into biogas. The method for extracting biogas here is an anaerobic biogas digester. To maximize biogas through processed waste, two starters are used in the form of EM4 and yeast. The effect of the yeast type starter can maximize CH4 yields, which can be proven by the results of the two types of digesters, namely with yeast 192.56 Ppm while with EM4 ¬93.05 Ppm. In practice, in order to analyze the gas results, the researchers implemented an MQ2 gas sensor and thermocouple. Through sensor fusion, the best methane value can be seen at 192.56 Ppm with a temperature of 34˚ Celsius, which was obtained through fermentation for 30 days. Through this, the benefits obtained are not only reducing waste, but also renewable energy can be obtained. 
Efektifitas arang aktif tongkol jagung dalam menurunkan emisi kendaraan bermotor berbahan bakar ganda H.S. Tira; Y.A. Padang; A. Mulyanto; S. Syahrul; S. Salman; D. Putra
Dinamika Teknik Mesin Vol 14, No 2 (2024): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i2.829

Abstract

Emission reduction through after treatment processes has become one of the options to minimize the adverse effects of two-wheeler emissions. Activated charcoal adsorbents have been proven effective in reducing emissions to a certain extent. In this study, corn cob charcoal activated with a 15% NaCl solution serves as the adsorbent. The adsorbent used is shaped into particles with a mesh size of 10. The adsorbent is placed in the modified motorcycle muffler. Testing is conducted on two-wheeled vehicles operated using the dual-fuel method, where biogas and pertalite are used as fuels. With this method, fuel concentrations are obtained significantly smaller compared to vehicles without emission reduction methods. Testing is carried out for 2 hours to determine the durability of the adsorbent in absorbing exhaust gas emissions. Based on the test results, where data collection is conducted every 10 minutes, the concentrations of emissions including hydrocarbons (HC), carbon monoxide (CO), and carbon dioxide (CO2) initially decrease and then rise again after several minutes. This indicates that the adsorbent effectively reduces emissions in a relatively short duration. However, the effectiveness of corn cob activated charcoal in reducing these three emissions varies, with the adsorbent showing good performance in reducing HC
Performa motor bakar silinder tunggal dengan variasi angka oktan bahan bakar dan tekanan kompresi B. Rahmat; M.B.R. Wijaya; Y.B. Wirawan; F.Z. Bahtiar
Dinamika Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i1.677

Abstract

In recent times, automobile and motorcycle manufacturers have been focusing on producing powerful and efficient engines. These engines are designed with high compression pressure to achieve better performance and fuel economy when using gasoline. However, it's not widely known that high-compression engines require gasoline with a high octane number. The purpose of this study was to investigate the impact of different compression pressures on the power and torsion output of a single-cylinder combustion engine, using RON 92, RON 95 and RON 100 gasoline. To modify the compression pressure, different numbers of gaskets are used on the cylinder head. Each with a quantity of 1 gasket, 2 gaskets, and 3 gaskets. This is done to manipulate the combustion chamber volume of the motorcycle engine, resulting in changes in the compression pressure values. The researchers conducted dynamometer tests to measure the performance differences, including power and torque output. The findings revealed that the engine with the highest compression pressure (11.8 kg/cm2), fueled with Pertamax racing gasoline (RON 100), delivered the highest power output of 7.8 kW, with the highest torsion output of 10 Nm. On the other hand, the engine with the lowest compression pressure (10 kg/cm2), fueled with Pertamax gasoline (RON 92), produced the lowest power output of 4.2 kW, with the lowest torsion output of 3.8 Nm.
Prototipe alat bantu ukur dimensi kendaraan bermotor berbasis mikrokontroler A. Novianto; B. Istiyanto; A. Siswono
Dinamika Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i1.784

Abstract

This research is a type of research and development (R&D) research whose output produces a design product for tools to measure the dimensions of motorised vehicles. The goal is to create a vehicle dimension measurement device that is portable, quick, accurate, and easy to use. The design of the tool consists of various components that are interconnected into a series, which is then programmed according to needs. The way the series of tools work is by emitting infrared light through a laser distance sensor, which will then be reflected on the reflector in the support tool. The data will be processed using an ESP32 microcontroller, and the measurement results can be seen via the LCD module and printed out via a thermal printer. This microcontroller-based prototype of a motor vehicle dimension measurement tool can measure vehicle dimensions more quickly and accurately compared to manual measurements. The use of a support tool is more effective in determining the outermost part of the vehicle compared to the manual method using poles and roll metres, which involves more than three people. The Microcontroller-Based Digital Motor Vehicle Dimension Measuring Tool Prototype works according to the Arduino programming that has been previously designed. The results of the comparison test between the measurement results from the prototype tool and the data from BPLJSKB show a significance value (P) of 0.125. With a significance value greater than 0.05, it can be concluded that the measurement results from this tool are not significantly different.
Unjuk kerja mesin diesel berbahan bakar biodiesel campuran jatropha – sawit 4 : 1 Wahyudi, W.; Nadjib, M.; Mahottama, S.M.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i1.714

Abstract

The increasing need for energy and environmental problems caused by the use of fossil fuels make the development of alternative fuels very important. This research aims to explore the potential of a jatropha-palm biodiesel combination with a 4:1 composition as an alternative fuel. The methods employed include esterification and transesterification of both oils, along with physical property testing and diesel engine performance. Results indicate an increase in density and viscosity with increasing biodiesel concentration, while the calorific value decreases. The fuel injection angle also changes with a higher biodiesel proportion. The diesel engine exhibits variations in rotational speed and power depending on the load and type of fuel. Specific Fuel Consumption (SFC) increases with engine load. In conclusion, the jatropha-palm biodiesel combination holds potential as an alternative diesel engine fuel.
Kinerja pengering satu tungku penukar panas dengan energi sekam padi untuk mengeringkan pisang menggantikan pengeringan langsung matahari Alit, I.B.; Susana, I.G.B.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i1.817

Abstract

The banana drying process for small farmers only uses the sun due to technological and cost limitations. The weakness of drying products is that they are very dependent on the weather. An alternative is to use a rice husk energy dryer because it is cheap and easy to obtain. The method involves converting rice husks into thermal utilizing a heat exchanger. The heat exchanger transfers heat from burning the husk to the drying chamber. Research was conducted to compare the temperature and drying time between sun drying and rice husk dryers. Apart from that, to determine the dryer's performance for drying bananas for a small-scale farmer. As a result, the rice husk energy dryer provides a shorter time than drying under the sun. To reduce the water content from 72% to a maximum of 40%, the time required for a rice husk energy dryer is 300 minutes, and 660 minutes for sun drying. The resulting temperature averages 55.11oC, while sun drying averages 29.02oC. In addition, the rice husk energy dryer produces a drying efficiency of 44.15%, which occurs at the beginning of drying and ends at 4.61%. This is a result of the high initial moisture content. During drying, the water content of the material evaporates, which impacts the energy absorption process by the banana from the dryer. The drying rate also followed this pattern: at the beginning, it was highest at 5.93 g/minute, and at the end, it was the lowest at 0.1 g/minute.
Effect of variations in the hitting point on the blade on performance of overshot water turbine Duma, G.A.; Indah, A.B.R.; Sule, L.; Kondorura, K.
Dinamika Teknik Mesin Vol 15, No 1 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i1.970

Abstract

Water turbine is very important technology in producing electrical energy from renewable energy sources. Overshot turbine utilize specific gravity of water hit the blade and converts the potential energy of water into kinetic energy when the nozzle sprays water that hits the bucket and then passes it on to the transmission system becomes mechanical energy. This mechanical energy is converted into electrical energy by the generator. This research was carried out experimentally using five curved blades and an overshot turbine. The hitting point on blade distances are 0.13 m, 0.15 m, 0.17 m, 0.19 m, and 0.21 m and varying load, is 0.1 kg - 1.3 kg with constant discharge and head. The results obtained show that variations in hitting point on blades influence turbine power and turbine efficiency. The highest turbine power and efficiency for discharge of 0.0009 m3/s was obtained at hitting point of 0.13 m with load of 1 kg which produces 3.7888 watts of  turbine power and efficiency is 25.05 %.
Drying time and mixture composition effect on biomass of pine cone and palm shell Radyantho, K.D.; Rusdan, A.; Suanggana, D.; Haryono, H.D.; Kan, E.F.
Dinamika Teknik Mesin Vol 15, No 1 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i1.1043

Abstract

According to the International Energy Agency (IEA), global energy demand is expected to rise by 45% by 2030, with around 80% still met by fossil fuels. This necessitates urgent development of alternative energy sources, such as biomass, which is renewable and can help reduce organic waste. This study examines the impact of varying drying times and mixture compositions of palm shells and pine fruits on the characteristics of briquettes. These materials were chosen due to their availability and potential to mitigate environmental impacts.The research investigates the moisture content, calorific value, and ash content of the briquettes. Results show all briquette compositions meet the Indonesian National Standard (SNI) No. 1683:2021 for moisture content, though only WP3 fails to meet standards. Ash content for all variations exceeded the SNI threshold (≥ 10%). However, all met the calorific value standard, with WP3 achieving the highest value (6643.18 cal/g). ANOVA analysis indicates both mixture composition and drying time significantly affect moisture and ash content, but only drying time significantly impacts calorific value
The effect of fins on PCM containers on solar panel cooling performance Seto, D.B.; Yahya, W.; Ramelan, U.
Dinamika Teknik Mesin Vol 15, No 1 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i1.1035

Abstract

Solar energy is a renewable energy source that is abundant and emits low emissions. The operating temperature of a solar panel has a significant impact on its efficiency. A 50 Wp polycrystalline solar panel was tested in this experiment using PCM (paraffin) as a passive cooling solution and without it. The PCM was placed on the backplate of the solar panel using a container equipped with fins to enhance cooling efficiency. Simulations were conducted using a solar simulator with varying light intensities of 470 W/m², 650 W/m², 900 W/m², and 1000 W/m², while a blower was used to simulate constant airflow around the surrounding area.Evaluating the panel temperature and calculating the error rate in experimental findings were the goals of the simulation. According to the simulation, the average temperature of a solar panel without cooling reached 59.4°C at an intensity of 1000 W/m2, but the temperature dropped to 57.8°C and 55.4°C, respectively, when PCM cooling with 5 and 10 fins was used.This experiment demonstrated that the application of PCM with a modified container can lower the maximum temperature of the solar panel and increase its maximum efficiency by 1.15% at an intensity of 1000 W/m². This passive cooling system has proven to be effective in reducing the operational temperature of solar panels.
Characterization of nanocellulose from banana stem fiber and its bionanocomposite as a thermal insulation material Syahrul, A.I.; Rosyidin, M.D.; Hidayat, S.; Khaerunisa, K.; Soraya, N.; Sari, N.H.; Syahrul, S.
Dinamika Teknik Mesin Vol 15, No 1 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i1.1009

Abstract

Nanocellulose has garnered significant attention due to its unique properties and potential in various applications, including thermal insulation. The abundant banana stems found in Lombok Island generate considerable waste that can be utilized as a raw material for nanocellulose. This research aims to characterization of nanocellulose derived from Kepok banana stems and its composites as thermal insulation in solar panels. Nanocellulose was produced using acid hydrolysis with sulfuric acid (H2SO4), and several treatments were carried out including Natrium hydroxide (NaOH), Sodium chlorite (NaClO2), Sulfuric acid (H­2SO4), The results show that nanocellulose from banana stems has a tensile strength of 13.374 MPa - 13.63 MPa. The addition of nanocellulose was found to increase the tensile strength of the composite reaching 13.374 up to 13.63 MPa, thermal conductivity 0,1692 up to 0,1940 W/mK and is quite heat resistant at a temperature of 200 °C. SEM photos of nanocellulose show surface roughness and produce interface strength between banana stem fiber nanocellulose and polyester resin. With solid bonding, good tensile strength, conductivity and thermal stability, bionancomposites from banana stem can be used as thermal insulator (backsheet) materials for solar panels.

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