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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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Pengaruh variasi komposisi arang kelapa dan kayu berpenguat serat ijuk terhadap sifat fisik dan mekanik komposit kampas rem Salman, S.; Triady, A.A.A.; Rahman, M.A.
Dinamika Teknik Mesin Vol 8, No 2 (2018): 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.v8i2.212

Abstract

The breaking system is a mechanical system to reduce the movement of the wheels. The existing nowadays friction material from asbestos belongs to cancer risk besides accelerating the damage of the brake drum. Therefore, the green friction material needs to be developed.The objective of this study is to determine the best composition of coconut shell of charcoal powder, wood powder, palm fibre and phenol resin as an alternative substitution of brake friction material. Variations in the percentage composition of coconut shell of charcoal powder were 45%, 40%, 35%, 30% and 25%. Sawdust and phenol resin were constant at 20% and 25% respectively, while the palm fibres were 10%, 15%, 20%, 25% and 30%. The specimens were produced by moulding under pressure 4 tons and heated at temperature 150o for 3 hours. The tests were wear, hardness, tensile test and micro photograph.The results showed that the lowest wear value is 1,68x10-6 gr/mm2.s and the highest one is 3,71x10-6 gr/mm2.s. The highest hardness value is 60,497 HBN and the lowest one is 54,329 HBN. While the maximum tensile stress is obtained at 9,50x10-1 MPa and the lowest one is 2,01x10-1 MPa. The best composition is obtained at the composition of 45% of coconut shell of charcoal powder, 20% of wood powder, 10% of palm fibre and 25% of resin phenol.
Filamen printer 3D berbasis limbah PET (polyethylene terephthalate) dan kitosan cangkang udang Azami, I.; Kurniasih, P.; ., S.; Amantha, A.; Habiiburrahman, N.; Sari, N.H.
Dinamika 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.v14i1.759

Abstract

One alternative for processing PET (polyethylene terephthalate) plastic waste is to convert it into a basic material for making 3D printer filaments with the addition of shrimp shell chitosan. The addition of shrimp shell chitosan to the filament can increase its mechanical strength. The aim of this research is to determine the best formulation and effectiveness of the combination of PET plastic with chitosan as 3D printer filament on the mechanical properties and microstructure of the surface. Making 3D printer filament from a combination of PET and shrimp shell chitosan using a double screw extruder with varying ratios between PET and shrimp shell chitosan (99 : 1, 97.5 : 2.5 and 95 : 5) with temperature variations at 175° C (Hopper Zone ), 195°C, 225°C, 245°C (Die zone) using a screw rotation speed of 50 rpm, with the testing process including a tensile test, to determine the mechanical properties of the material by analysis using the SEM (Scanning Electron Microscope) test ) to identify the surface morphology and size of the filament material. The test results for composition 99:1 (sample 1) had the lowest tensile strength value of 35.79 MPa, breaking 0.10 mm with an elongation value of 0.32%. Composition 97.5:2.5 (sample 2) with a tensile strength value of 96.20 Mpa, longest breaking length of 0.13 mm and highest elongation value of 0.42%. Composition 95:5 (sample 3) only has the highest tensile value of 98.95 MPa, with a breaking length of 0.06 mm and the lowest elongation of 0.18%.
Analisis pengaruh diameter pipa terhadap perubahan sub-regime pola aliran 2 fasa stratified air-udara pada pipa horizontal Rahmandhika, A.; Hendaryati, H.; Mokhtar, A.
Dinamika 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.v14i1.648

Abstract

Stratified water-air flow is very common and expected to occur in piping systems. Understanding the characteristics of liquid hold-up in stratified flow patterns is considered one of the important factors in operational financing for gas and liquid transportation in various industries. This study aims to determine the pipe diameter effect on the parameters of stratified flow pattern sub-regime. The data obtained in this study is used as a supporting database as a basis for developing the piping system design. The research was conducted on acrylic pipes with diameters of 16 and 26 mm and a length of 9.5 m. The method applied to determine the characteristics of the stratified flow pattern is the constant current (CECM). The observation area is located 220 – 260 D from the inlet. The value range of JL = 0.03 – 0.1 m/s and JG = 2.83 – 10 m/s. Based on the experiment, the results obtained from the liquid hold-up affect the criteria for sub-regime changes in stratified flow patterns. The liquid hold-up is affected by the superficial velocity of the liquid, gas, and inner pipe diameter. The higher the liquid's superficial velocity, the greater the liquid hold-up value. The higher the gas superficial velocity, the smaller the liquid hold-up value. At low JL, an increase in JG causes a sub-regime transition of the flow pattern from smooth stratified to wavy stratified. At high JL, an increase in JG causes a transition of the flow pattern sub-regime from pseudo slug to roll wave and wavy stratified.
Peningkatan kekerasan dan ketahanan korosi paduan Fe-2,9Al-0,4C dengan proses karburisasi padat Kartikasari, R.; Susiana, A.; Ocktavian, D.
Dinamika Teknik Mesin Vol 11, No 1 (2021): 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.v11i1.352

Abstract

Fe-Al-C alloy is a superior and economical new alloy to replace the ferritic stainless steel, whereas aluminum replaces chromium, which is relatively expensive. Some applications of Fe-Al-C alloys require hardness at the surface. This study aims to determine the effect of the temperature carburizing process on the hardness and corrosion resistance of Fe-2,9Al-0,4C alloys. Material used is Fe-2,9Al-0,4C steel alloy. Surface hardening using a solid carburizing method. The solid carburizing process carried out by the holding time for 3 hours at various temperatures of 850°C, 900°C, 950°C, 1000°C, and 1050°C. Carburized is used in the form of powder coal and MgCO3 catalyst. Tests carried out are chemical composition, microstructure, hardness, and corrosion tests. The test results show that the chemical composition of the Fe-2,9Al-0,4C alloy contains elements of 2.91% Al and 0.40% C. Microstructure formed is ferrite and pearlite with a dendritic pattern. The martensitic structure formed at 950°C, 1000°C, and 1050°C. The Carburizing process increases the hardness value where the higher temperature carburizing process, the higher hardness values until it reaches a maximum temperature of 1050°C with a hardness value of 1040.5 kg/mm2. The highest corrosion resistance value occurs after the 850°C carburizing process at a rate of 41.58 mpy corrosion (up 40.9% of the raw material). At a higher temperature carburizing process lowers the corrosion resistance of the alloy Fe-2,9Al-0,4C.
Analisis kinerja turbin air arus bawah bentuk sudu bengkok dengan variasi material Duma, G. A.; Sule, L.
Dinamika Teknik Mesin Vol 12, No 2 (2022): 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.v12i2.548

Abstract

A water turbine is a device used to convert the potential energy of water into mechanical energy. This mechanical energy is then converted into electrical energy by a generator. This test was carried out experimentally using a crooked blade type with six blades and the type of water turbine used was undershoot. Various types of blade materials are plastic, aluminium, and iron. As well as varying the opening of fluid flow, namely the valve opening of 25%, 50%, 75%, and 100%. The results obtained indicate that variations in turbine blade material have an effect on turbine power and turbine efficiency The highest turbine power and efficiency was obtained at 100% valve opening with a load of 0.7 kg on plastic, iron and aluminium material. The highest turbine power is 1.16 watts for the plastic blade, the aluminium blade is 1.22 watts, and for the iron, the blade is 1.1 watts. The highest efficiency obtained for plastic blades is 50.14 % for experiment and theoretical is 5.67%, aluminium blades are 52.77% for experiment and 54.41% for theoretical, iron blades are 47.5% for experiment and 48.97% for theoretical.
Analisis Kekuatan Impact Komposit Polyester-Serat Tapis Kelapa Dengan Variasi Panjang Dan Fraksi Volume Serat Yang Diberi Perlakuan NaOH Lokantara, I Putu
Dinamika Teknik Mesin Vol 2, No 1 (2012): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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

Abstract

Tujuan penelitian ini adalah untuk menganalisis kekuatan impact komposit polyester berpenguat serat tapis kelapa yang diberi perlakuan NaOH pada panjang dan fraksi volume serat yang bervariasi Komposit yang dibuat menggunakan penguat serat tapis kelapa dengan matrik berupa resin unsaturated polyester (UPRs) jenis Yukalac 157 BQTN-EX dengan 1% hardener jenis MEKPO dengan variasi panjang serat tapis kelapa 5 mm, 10 mm dan 15 mm sedangkan variasi fraksi volume serat 20%, 25%, 30%. Komposit dibuat dengan teknik press hand lay-up dengan perlakuan serat menggunakan campuran NaOH-Air. Perlakuan serat tapis kelapa dengan direndam di air mendidih dengan suhu 100 °C selama 1 jam, selanjutnya serat tapis kelapa dikeringkan menggunakan oven dengan suhu 65 °C selama 12 jam setelah itu serat tapis kelapa direndam didalam larutan NaOH - Air (5 gram NaOH + 95 ml air) selama 2 Jam. Komposit selanjutnya di post curing selama 12 jam dengan suhu 65 °C. Spesimen uji komposit dipotong sesuai standar ASTM D 256 untuk spesimen uji impact. Selanjutnyaspesimen kompositdilakukan pengujian impact. Kekuatan impact meningkat seiring meningkatnya fraksi volume dan panjang serat. Nilai kekuatan impact terbesar terdapat pada pengujian impact dengan komposit panjang serat 15 mm dengan Fraksi Volume 30% sebesar0.0255 Nm/mm2. Hasil pengamatan struktur mikro menunjukkan bahwa pada panjang serat 15 mm ikatan antara matrik dan serat lebih kuat dibandingkan dengan variasi panjang serat 5 mm dan 10mm sehingga komposit yang dihasilkan lebih kuat dan mempunyai nilai kekuatan impact yang lebih besar. Semakin panjang serat yang digunakan akan mengurangi crack deflection sehingga kekuatan impact menjadi semakin baik. Demikian pula dengan fraksi volume yang semakin tinggi menyebabkan matrix flow berkurang sehingga kekuatan impact akan meningkat.
Simulasi karakteristik mesin termoakustik pembangkit listrik dengan penambahan model kerugian minor dari dua segmen konis Nurpatria, N.; Mirmanto, M.; Padang, Y.A.; Nurchayati, N.
Dinamika 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.v14i2.845

Abstract

Acoustic energy output level from regenerator segment of a thermoacoustic engine model is attenuated along it’s loop due to several conditions including minor losses. This article discusses the result of Delta EC simulation of a thermoacoustic engine model acting as simple electric power generator that inserted with two conical segments. The cone segments are capable to lower the energy loss which in turn improve the overall performance of the engine in term of nett heat to acoustic energy conversion efficiency. Combined acoustic energy loss induced by both cones is equivalent to 4.94 watts minor losses. At this condition, regenerator segment amplifies the incoming acoustic energy flow of 57.02 watt up to 93.57 watt, which is equals to 36.55 watts acoustic amplification. It leads to increasing of overall engines heat to acoustic efficiency into 14.05%, which is 1.29% higher than those at the case of without cones. This engine performance improvement addressed to smoother streamline of working fluid flow inside the loop.
Pengaruh jumlah sekat vertikal dan debit aliran terhadap viskositas oli pada separator air oli Qiram, I.
Dinamika Teknik Mesin Vol 7, No 1 (2017): 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.v7i1.5

Abstract

Water pollution is a major environment problem. Oil water separator can be used to solve this problem. This research is aimed to get the effect of vertical divider number and fluid flow rate due to oil viscosity. The research is done by experiment using gravity separator. Vertical dividers are varied as 5 and 7. Fluid flow rate is vary as 176,5; 106,6; 53,7 and 33,7 ml/s. Oil 0,5 litre is mixture with 10 litres of water. Oil viscosity is measured with simple flow gravity method. The data is analized statistically using SPSS 17.0. The result shows that vertical divider number and fluid flow rate have effect on oil viscosity.
Heat loss from hot water flowing in a copper pipe insulated using air enclosed with a PVC pipe Albayani, A.; Mirmanto, M.; Syahrul, S.
Dinamika Teknik Mesin Vol 8, No 1 (2018): 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.v8i1.137

Abstract

This paper presents investigations of heat loss from hot water flowing in an insulated copper pipe. Investigations were performed to know the heat loss from a copper pipe insulated using air enclosed with a PVC pipe. The fluid temperature used was kept at approximately 75°C in the entrance and its mass flow rate was around 12 g/s. The nominal copper pipe diameter was 6.35 mm; while the diameters of the PVC pipe were ranging from 12.7 mm to 5.08 mm. The length of the test section was approximately 3000 mm. The results show that the biggest heat loss is found using the bare copper pipe. When the copper pipe is insulated using air enclosed with a PVC pipe, the heat loss decreases with the increased PVC pipe diameters. The trend of the heat loss agrees with the critical insulation diameter theory.
PENGARUH KOMPOSISI BRIKET BIOMASSA KULIT KACANG TANAH DAN ARANG TONGKOL JAGUNG TERHADAP KARAKTERISTIK BRIKET Purnawarman, Purnawarman; Nurchayati, Nurchayati; Padang, Yesung Allo
Dinamika Teknik Mesin Vol 5, No 2 (2015): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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

Abstract

Energy crisis in the world especially from fossil fuels which caused by the depletion of non-renewable petroleum reserves. It is therefore necessary to find sources of alternative fuels that are renewable. Biomass is a solid waste that can be used as a fuels source. Peanuts shell and cobs are biomass from agricultural waste which is quite abundant so it is potential to be used as a source of alternative fuels.In this study, peanuts shell biomass combined with charcoal cobs to be made into briquettes by varying the percentage composition of peanuts shell biomass and charcoal cobs as follows 75 : 25, 50 : 50, and 25 : 75. Briquettes that have been printed and then tested its characteristic include heating value, moisture content and ash content.The results show that as the increasing percentage of the charcoal cobs  have a significant influence on the characteristic of the briquettes. Briquettes with mix KKT 25 : ATJ 75 has an higher heating value (HHV) and lower heating value (LHV) the highest is equal to 28.718 kJ/kg and 28.279 kJ/kg, and the lowest percentage of moisture content is equal to 5.854%, but the highest result percentage of ash content is equal to 9.326%. Based on the test of these characteristic, biomass briquettes peanuts shell - charcoal cobs meet quality standards that have been established and eligible to became a source of alternative fuels.

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