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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 kecepatan potong terhadap keausan dan panjang pemakanan mata pahat keramik alumina pada pembubutan cast iron Nistelroy, A.R.; Lubis, S.Y.; Riza, A.
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.v14i2.862

Abstract

Turning is a metal forming process to produce cylindrical machine parts made using a lathe machine. Cast iron is one of the materials that has hard and brittle properties, therefore a harder and tougher type of cutting tools is needed. One type of cutting tools that has hardness and resistance to high temperatures is alumina-based ceramic. This study aims to analyze the alumina ceramic cutting tools by determining the level of wear that occurs with various cutting variables in cast iron turning. The experiment was carried out using a conventional lathe while the tool used was an alumina-based ceramic tool with a dry turning process without cooling. The cutting parameters used were cutting speed: 141.3 m/min, 222.9 m/min, 351.6 m/min, Spindle rotation: 450 r/min, 710 r/min, 1120 r/min, Depth of Cut: 0.1 mm, Cutting Resistance: 0.1 mm. The turning process was carried out with a time span of 5 minutes and then the tool wear value (Vb) was measured at 0.3 mm. The experimental results showed that at a cutting speed of 141.3 mm/min, the tool wear was 0.3 mm with a total feed length of 1575 mm for 35 minutes. At Vc 222.9 mm/min the tool wear was 0.35 mm with a total feed length of 1420 mm for 20 minutes. At Vc 351.6 the tool wear was 0.32 mm with a total feed length of 1680 mm for 15 minutes.
Efisiensi desalinasi air laut dengan menggunakan konsentrasi reflektor parabolik E.Y. Tae; B.V. Tarigan; M. Jafri
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.v14i2.866

Abstract

Water is very important for the life of living things, many countries in the world are experiencing a clean water crisis. The total global water reserve is less than 1.4 billion km3, of which about 97.5% is in the oceans and the remaining 2.5% is fresh water contained in the atmosphere, ice mountains and groundwater. Desalination is generally the process of removing salt from seawater or saltwater. Desalination of seawater and brackish water can be utilized to increase the availability of clean water. Two types of desalination techniques used can be classified into phase change (heat) and membrane. desalination techniques with phase change processes are processes that utilize changes in a substance under certain temperature conditions. While desalination techniques with membrane processes are processes that focus on filtering a substance accurately. Comparison of desalination efficiency between the three materials in different days is the flanel sheet material, the goni and the combination of flanels and goni. Flanel leaf material has the highest efficiency value on the 1st day with a presentation of 57,71% while the lowest one has a value of 32,24%. Then on the 2nd day the most efficient value is 45,32%, while the least value is 0%. In the first day goni material has a highest efficacy value with a presentation of 34,56%, and a lowest value with 0%. Then the second day trial with the same material has its highest effectiveness value with the presentation of 41,44%, and the lower value with 0%.
Analisis optimasi aplikasi variasi jaringan irigasi tetes PVC ber-amiter pada lahan bertingkat untuk mendukung kegiatan pertanian di permukiman perkotaan I D.G.J. Negara; L. Hanifah; A. Supriyadi; E. Pradjoko; A. Pracoyo
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.v14i2.833

Abstract

 This study aims to determine the effect of variations in the drip irrigation network of pvc pipes with amiter on irrigation distribution, irrigation uniformity, and soil moisture achievement on variations in irrigation duration. The test was carried out on four variations of the water level of the tower and four variations of the pvc drip irrigation network on the multi-level system, with four variations of irrigation duration t1 = 5 minutes, t2 = 10 minutes, t3 = 15 minutes and t4 = 20 minutes. The test data analyzed includes irrigation distribution data and irrigation uniformity (Cu) and soil laxative (Wt). The results of the analysis showed that with a deviation of about 1 ml, the average Cu above 97% was very good. The best drip irrigation distribution was obtained in the network of variation 3 with a range of 43.6 ml with a deviation of about 1 ml, while in variation 1 the distribution was above 210 ml with a deviation of 1-5 ml. Wt soil moisture obtained from drip irrigation variation 3 at t1-t4 duration at a depth of 20 cm, at L1 ranged from 0.69% - 21.65%, at L2 around 2.16% - 21.65%, at L3 by 2.19% - 21.68% and at L4 by 10.41% - 28.66%.  In 15 minutes of irrigation, the addition of soil lengas (w) is obtained about 7-9% with a depth of 5 cm -15 cm and at a duration of 20 minutes about 21% w is obtained for a depth of 20 cm – 25 cm.
Pengaruh variasi besar butir dan variasi komposisi bahan terhadap kinerja briket arang tempurung kelapa dan sekam padi Joniarta, I.W.; Wiratama, I.K.; Wijana, M.; Sujita, 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.v14i2.925

Abstract

Abundant biomass waste is often thrown away. Careless disposal of waste will have a negative impact on environmental quality. Research regarding variations in composition and grain size of biomass waste charcoal briquettes on briquette performance is feasible. The aim of the research is to obtain briquettes that have high performance. The research method used was experimental research, coconut shell charcoal and rice husk charcoal, made in sizes 20 mesh, 60 mesh and 100 mesh. Then mixed with 15% starch adhesive with variations in the composition of coconut shell charcoal (TK): rice husk charcoal (SP), namely: I (75%:25%), II (50%:50%) and III (25%:75% ), After printing, the biket is dried in the sun and in the oven until it reaches a moisture content of (14-15)%. After the briquettes are dry, the heating value, flame duration and water boiling time are tested. In the calorific value test, the greater the composition (TK), the greater the calorific value produced. The highest heating value of 5937 kcal/kg was obtained from composition I, mesh 60 and the lowest heating value of 3714 kcal/kg was obtained from composition III mesh 60. The shortest flame duration of 1386.6 seconds occurred in mesh 20 composition III and the longest flame duration was 1933.2 seconds. obtained on mesh 100 composition I. In the Boilling Time test, it was found that the larger the grain size and the greater the composition of the coconut shell charcoal mixture in bioarang briquettes, the faster the water boiling time.
Nilai kekerasan permukaan pada beberapa tipe beton dengan agregat buatan dan korelasinya terhadap kuat tekan N.N. Kencanawati; H. Hariyadi; N. Ngudiyono; B. Anshari; L.G.A. Mukti
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.v14i2.835

Abstract

Along with the development of technology to utilize waste in order to create sustainable concrete materials; therefore, this research tries to apply several artificial aggregates derived from concrete waste and fly ash. The test object was a standard concrete cylinder measuring 150 mm in diameter and 300 mm in height. Concrete was made from geopolymer coarse aggregate, treated recycled coarse aggregate, and conventional coarse aggregate. The surface hardness value was measured using a hammer test to obtain the rebound number (RN). Tests were also conducted on concrete with natural aggregate. The results show that the RN value of treated recycled coarse aggregate concrete is in the second place after normal aggregate concrete, followed by the RN value of conventional recycled coarse aggregate. Concrete with geopolymer coarse aggregate is concluded to be lightweight low strength concrete based on the RN value and compressive strength obtained. Furthermore, the relationship between RN values and compressive strength for other concretes is shown by the correlation of y = 0.837 x + 3.627, where y is the concrete compressive strength (MPa) and x is the surface hardness value (RN).
Peranan medan magnet dan campuran etanol-biodiesel minyak jelantah pada pembakaran droplet terhadap perilaku api dan emisi gas buang Perdana, D.; Fiyanto, S.F.W.A.
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.v14i2.924

Abstract

Petroleum reserves are increasingly depleting, causing a scarcity of petroleum fuel caused by the rapid progress of transportation and the manufacturing industry. This condition forces researchers to search for and develop new renewable energy source. The purpose of research is to understanding and determines role of north-south (U-S) and south-south (S-S) magnetic fields to blend waste cooking oil biodiesel-ethanol on flame evolution, flue gas emissions, and temperature during droplet combustion. Waste cooking oil biodiesel and ethanol were used in this research by adding variations in the direction of repulsive and attractive magnetic fields with an intensity of 11000 gauss. Diameter of droplets tested was 0.3 mm and was placed on a type K thermocouple wire with diameter of 0.1 mm. This research found the role of attractive magnetic field (U-S) in blend waste cooking oil biodiesel-ethanol 20% to produce the shortest flame evolution of 704 ms, lowest CO of 165 ppm, and highest temperature of 828.5 oC. This happens because ethanol has a low flash point and large oxygen content, causing the combustion reaction to occur rapidly. The attractive of magnetic field (U-S) plays a role on attracting oxygen around flame to enter combustion reaction, while the H2O resulting from combustion is pumped out of flame.
Studi sifat mekanis dan elektrik paduan Cu-Ni-Wx (2 ≤ x ≤ 5wt.%) disintesis menggunakan cold compaction S. Suprianto; D. Hadiarsa; A. Syahputra; M. Mahadi; A. Pintoro
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.v14i2.839

Abstract

Copper-based alloys are common material which are widely used as electrodes for electrical discharge machining (EDM) due to their good electrical conductivity, but low mechanical properties. This problem can be solved by addition of some elements and also correct selected of the process parameter, in such compaction pressure in the powder metallurgy (PM) stages. The aim of this study to investigates the effect of W-refractory element and compaction pressure on the mechanical and electrical properties of the Cu-Ni-Wx based alloy. The research was conducted with varying (190, 220, and 250 MPa) of compaction pressure and Wx (x=2, 3, 4, and 5wt.%). Horizontal milling with 300 rpm has been used to mixing powder material. Furthermore, the sintering process at 770oC for 60 minutes by using a conventional furnace was conducted. In this current study, the maximum results of 123.2 VHN of the hardness, 325 MPa of compressive strength at 200 kN of the maximum load, and  4.62 x 107 (S/m) of the electrical conductivity were obtained at 250 MPa compaction pressure. The addition of W into Cu-based alloy tends to increase of the mechanical properties, however, reduce the electrical conductivity. On the other hand, microstructure observation shows that the increasing compaction pressure increases the solid solution phase between Cu-Ni and reduces the porosity.
Analisis performa inkubator grashof dengan menggunakan lampu LED sebagai pemanas Putra, R.O.; Tarigan, B.V.; Jasron, J.U.
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.v14i2.868

Abstract

The high infant mortality rate that occurs between the time after the baby's birth and the time when the baby is not exactly one year old is due to hypothermia/hypertermia, insufficient access to doctors and inability to pay for the use of pre-natal care equipment. Research has been conducted on the analysis of the performance of grashof incubators using LED lamps and copper fiber as heaters to determine the efficiency of LED lights when used for heating in a baby incubator (grazhof inkubator). The results of the research show that 20 watt LED lamp with the addition of fibre as a medium for the heating of air inside incubators is more efficient in tempering the air to reach a temperature of 35oC compared to a 25 watt fiber lamp that does not use a heater fiber. Temperature testing in a baby incubator is measured using a K-type thermocouple due to good accuracy and high sensitivity to temperature changes that need to be monitored in real time. From the results of the analysis of energy efficiency and heating speed (free convection) obtained results that show that with the addition of copper syrup as a heating medium in the incubator has a real influence on the speed of heating air inside the incubators.
Utilization of outdoor units as freshwater freezing machines on various masses of salt solution Mirmanto, M.; Sayoga, I.M.A.; Waasi, A.
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.v14i2.947

Abstract

The effect of solution mass on freezing the freshwater using an AC outdoor unit was investigated. The AC outdoor capacity was ½ PK and the evaporator to absorb the heat from the freshwater was designed in the form of a square spiral placed in a freezing box. The outdoor used R32 as the working fluid. The solution mass variations were 10 kg, 12 kg and 14 kg.   The freezing box was filed with saline solution with a concentration of 20%. The mass of fresh water that was frozen was wrapped in plastic with a mass of water per package of 500 grams. The total mass of the freshwater was 10 kg. The results show that the fastest freezing time occurs at a mass of 10 kg of salt solution with a freezing time of 3.5 hours and the longest freezing time is at a mass of 14 kg of solution with a freezing time of 6 hours. The highest total heat flow rate is 554 W found in the variation of 10 kg solution mass. The AC outdoor unit is very effective to be used as a freezing machine with an EER of 5.8.
Desain dan simulasi uji pembebanan statis pada jig and fixture bor dan gerinda portable F. Kurniawan; A.K. Faizin; M.A.S. Atmojo; M.D. Lisanto
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.v14i2.879

Abstract

Jig and fixture is a tool that is designed to pay great attention to the operator's ease and comfort in operating the tool. A drilling machine is a tool used to make holes in work pieces, while a grinding machine is a tool used to cut work pieces. The primary objective of this study is to assess the performance of jig and figture design under static loading confitions. Solidworks software wa employed to conduct a static load simulation. The simulation result indicate a maximum displacement 4.731 x 10-3 mm at a load of 800 N and a safety factor of 91,79. Thus, jig and fixture design can safely accommodate load of up to 80 kg (or 800 N) applied to the vise bracket holding the workpiece.

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