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Mirmanto
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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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Pengaruh diameter lubang bubbles generator pada pengikatan karbon dioksida dengan larutan kalium hidroksida 4 molar Bachrudin, M.N.; Sutjahjono, H.; Ramadhan, M.E.
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.v8i2.163

Abstract

Bubble generator is an alternative technology for bubble producers. One of many other functions of bubble generator is as a purification tool. Type of bubble generator that's used in this research is Jet Column bubble generator. The diameter of the bubble hole generator affects the length of bubble life, the length of the bubble trajectory, the bubble shape, and the purification process absorption of CO2. The methods used in the purification process are making a solution 4 KOH molar, making purification tool, installating the output holes, gas purification process and gas testing performed repeated three times in each test process. The output bubble generator hole diameters are 0.08 mm, 0.12 mm and 0.16 mm. The result shows that the greater the diameter of the bubble hole generator of 0.12 mm makes the length of bubble life shorter, the time is 1,77 s and for the smallest hole diameter of 0.08 mm makes the length of the bubble life af about 3.21 s. The hole diameter of 0.08 mm results in the length of bubble trajectory of 1554.289 mm that is  longer than that of the hole diameter of 0.16 mm. The smaller hole diameter produces bubbles with an average length of 6.441 mm and bubble diameter of 1.237 mm. CO2 gas content decreased from 26.8% to 0.00%, and levels of hydrocarbon content increased by 5540 ppm.
EFFECT OF TUBE DIAMETER AND SURFACE ROUGHNESS ON FLUID FLOW FRICTION FACTOR Mirmanto, M.; Yudhyadi, IGNK; Sulistyowati, Emmy Dyah
Dinamika Teknik Mesin Vol 4, No 2 (2014): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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Abstract

Experiments have been performed to investigate the effect of channel roughness and diameter on fluid friction. Three different diameters and roughness of tubes were used to examine the friction factor. The first tube made of stainless steel with an inner diameter of 1.14 mm was investigated at Brunel University, whilst the others made of PVC with diameters of 17 mm and 15.5 mm rough were tested at Mataram University. The stainless steel was equipped with a 200 mm calming section and smooth one. The 15.5 mm diameter tube was coated internally with sand that had an average grain size of 0.5 mm so that the tube had a relative roughness of 0.032.  The last tube with a diameter of 17 mm was smooth as explained  in the H408 Fluid Friction Experimental Apparatus manual.            The results indicate that the flow in the stainless steel tube still obeys the theory and in the 17 mm tube shows a deviation in friction factor with the theory. However, this was due to no calming section installed in the test rig. Flow in the rough tube (15.5 mm diameter) demonstrates that the Reynolds number does not affect the friction factor in turbulent regimes and the experimental friction factors were reasonably in a good agreement with the theory or Moody diagram. Hence, the effect of decreasing in diameter of channels on friction factor is insignificant.
Pengaruh rasio diameter terhadap parameter-parameter energi turbin arus laut horizontal Rumaherang, Wulfilla Maxmilian
Dinamika Teknik Mesin Vol 10, No 1 (2020): 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.v10i1.306

Abstract

The ducted tidal turbine models have been developed to utilize convertion of the kinetic energy on ocean currents. The research on refining the turbine characteristics has been carried out by modifying the turbine’s shape and size. The study of the duct diameter ratio effect on the energy characteristics of the turbine was done in this work. This study was conducted by modifying the duct diameter ratio () with the constant inlet diameter D0 and outlet D2. The flow conditions are analyzed for five cases of turbines with different shapes and diameters to determine the optimum conditions. The optimum value of the diameter ratio could be obtained at the maximum value of power coefficient CP. Flow velocity in the ducted turbine was measured at three turbine sections, namely; the inlet section, the impeller housing section, and the outlet section. The measurement of flow in turbines was carried out at the free stream velocity U0 = 1,5 m/s. The power coefficient CP and thrust coefficient CT were calculated based on flow velocity data on the turbine cVennell sections for each case. The power coefficient CP reaches the maximum value (Betz limit) at the resistance coefficient K = 2 and the value of axial induction factor a = 0,37. These values were founded at diameter ratio d=0,66.  The value of thrust coefficient CT reaches the maximum value at K = 3,9, a = 0,53 and . The optimum value of the diameter ratio was founded at d=0,69.
PEMERATAAN ENERGI GELOMBANG LAUT DENGAN SISTEM BERPISTON AKSI GANDA Adi Sayoga, I Made; Nuarsa, I Made
Dinamika Teknik Mesin Vol 3, No 2 (2013): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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Abstract

Semakin menipisnya cadangan minyak dunia menyebabkan harga bahan bakar minyak (BBM) terus melambung. Kondisi ini menyebabkan masalah yang serius yang perlu diatasi. Potensi energi yang diperbaharui seperti : energi angin, matahari dan gelombang laut  perlu segera dilirik walaupun mungkin sudah terlambat. energi potensial dan kinetik yang terkandung pada gelombang laut dapat  dikonversikan untuk pemanfaatan tenaga listrik maupun pompa air bersih dan irigasi. Tujuan penelitian adalah untuk memanfaatkan potensi energi gelombang untuk dikonversi menjadi tenaga listrik.  Adapun manfaat penelitian ini adalah akan diperoleh metode dan sumber energi alternative yang ramah lingkungan serta tidak membutuhkan bahan bakar minyak. Energi alternatif ini ditunggu pemanfaatannya oleh masyarakat.    Kegiatan penelitian diawali dengan studi literatur untuk mengkaji penelitian yang terdahulu, mencari perumusan dengan teori yang ada. Hasil studi literatur dilanjutkan membuat disain atau rancangan alat dengan perhitungan–perhitungan. Perhitungan mengacu pada prinsip pemanfaatan energi gelombang laut semaksimal mungkin. Dari perhitungan tersebut sangat menentukan langkah selanjutnya seperti pembuatan bentuk, pemilihan bahan, menentukan alat ukur dan model pengukuran.             Konversi energi dari gelombang ke piston yang paling efektif terjadi pada saat pelampung (piston) diberikan beban W setengah dari Fa Total (W=Fa/2 total) dibandingkan pada saat tak berbobot (W=0) maupun pada saat piston diisi penuh (W=Fa total).            Dari hasil pengujian ternyata prototype pemerataan gelombang laut dengan sistem aksi ganda mampu menghasilkan energi listrik. Pada saat gelombang naik, energi gelombang menekan tuas melalui pelampung yang selanjutnya memutar roda gigi yang telah terhubung dengan generator listrik. Sedangkan pada saat gelombang turun roda gigi juga berputar akibat berat pelampung yang telah diiisi pemberat air. 
Rancang bangun dan uji performansi mesin pencampur beberuk, makanan khas Lombok Ansar, A.; Muttalib, S.; Sabani, R.; Kustina, R.
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.v11i1.359

Abstract

During this time the process of making beberuk was still done traditionally using a mortar as a mixer, so that production is very limited, while the market demand is quite high. To increase productivity, it is necessary to design a machine that can increase the production capacity of the beberuk. The research method begins with the mixing machine design process, then continues with the assembly process and engine performance test. The design of the mixing machine is done with two approaches namely functional approach and structural approach. Test engine performance on 3 power variations namely 144, 168, and 192 watts and 3-time variations namely 30, 45, and 60 seconds. The results showed that the cylindrical mixing chamber has a diameter of 20 cm and a height of 50 cm. The mixing tube has a rectangular hopper with dimensions of 37 cm long and 9 cm wide. Engine performance test results showed the best results on 168 watts of power treatment and 30 seconds with the results of mixing not bubbly and still looks tomato chunks and is not too smooth according to the standard beberuk food.
Performance of crusher machine for crushing coconut coir into cocopeat and coco fibre Anugrah, R.A.
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.v12i2.517

Abstract

The abundant resources of coconut coir in Indonesia, especially a tiny village in Kulon Progo district, namely Kadigunung, hadn't been used before this research. It was thrown away and mostly just burned by the villagers. Even though it can be used to become natural organic fertilizer for agriculture, most of the population members are making a living as farmers. But there is a problem when processing to make the fertilizer, and it is the use of conventional manner to crush the coconut coir into cocopeat and coco fibre. So they needed appropriate technology and crusher machines. It is a gasoline-powered crushing device with 5.5 hp and 2000 rpm. It has 21 moving and 12 fixed blades. The research data were obtained by digital tachometer and sound level meter measurements. Other data were also measured by formula calculation. The results of this research involved the data of fuel consumption, the machine's capacity, depreciation of raw coconut coir, noise level, linear v-belt velocity, and rpm of the blade shaft. They were 1.8 L, 0.05 kg, 99.3 dB, 2π m/s, and 330 rpm, respectively. So it can be inferred that the crushing machine is a good performance.
Pengaruh Posisi Penyemprotan Bahan Bakar Gas Lpg Pada Intake ManifoldTerhadap Konsumsi Bahan Bakar Pada Mesin Bensin Empat Langkah Satu Silinder (Honda Supra X) Nuarsa, I Made; Mara, I Made; Riskon, Riskon
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

One of major sources of air pollution is the result of combustion exhaust gases of automotive engines. As it is known that the process of fuel combustion from motor fuel produces exhaust gases which theoretically contain elements of CO, NOx, HC, CO2, H2O and N2, where many of which are polluting the surrounding environment in the form of air pollution. The use of LPG fuel for gasoline engine can be done by adding a piece of equipment called a conversion kit. In this study the fuel in the LPG gas injected in the intake manifold with some variation of spin injection with 3000 rpm, 4500 rpm and 6000 rpm for each transmision rate (Neutral s / d Gear 4). The result showed that the injection of fuel gas LPG in the rear position (P3) in getting a decrease in fuel Consumtion (FC) is optimal compared to other injection position (P1, P2). In addition the maximum fuel. Consumtion obtained at transmission rate at each round of variation mesin. Lowes CO emission levels found in LPG fuel injection in the rear position (P3) on the engine rev 3000 rpm kadar CO2 in round 3000 engine rpm optimum obtained from the use of LPG gas fuel injection in the rear position (P3) fornearly all transmision levels. Lowest HC emission values obtained on the location of the feul gas injection LPG rear position (P3) at 3000 rpm rotation at the 4th gear.
Analisis performa inkubator grashof dengan menggunakan lampu LED sebagai pemanas Putra, R.O.; Tarigan, B.V.; Jasron, J.U.
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.v14i2.868

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.
Pembuatan mesin uji tarik kapasitas kecil: bagian data akuisisi Pandiatmi, Pandri; Okariawan, IDK; Sulistyowati, Emmy Dyah; Salman, S.; Adhi, IG.A.K. Chatur
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.v7i1.6

Abstract

For the purposes of practicum and student research in the field of materials, tensile test equipment is very important. But the test equipment that is in the Department of Mechanical Engineering, University of Mataram has a very large capacity so it is not suitable for testing materials such as plastics and composites so this study bertujuann to make small capacity tensile testing machine for purposes of practicum and student research in the field of polymer materials and composites. Due to limited funds, the research is focused on making data acquisition tensile testing machine. Necessary materials are on site, cable, lead solder, lacquers cable socket and supported by laboratory equipment mechanical engineering majors who have been there, but some of the components to be purchased as load cell, electronic extensometer, and the operational amplifier module arduino uno boad. Design data acquisition consists of a sensor that is load cell, extensometer electronic, signal conditioning is an operational amplifier that is arduino uno data recording boad connected with the personal computer and data processing using LabView software so that the output of the data acquisition is in the form of tables and graphs. With their small capacity tensile testing machine is expected to provide an additional means of learning in the laboratory and student research.
Pengaruh sudut alur sekat terhadap unjuk kerja menara pendingin (cooling tower) Ardani, A.; Qiram, I.; Rubiono, G.
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.v8i1.136

Abstract

Cooling tower is an equipment that use to decrease water temperature by extracting heat and emitting it to atmosphere. Cooling tower buffle is an important component that effect water flow. This research is aimed to get the effect of cooling tower buffle due to its performance which are range, heat transfer rate and efficiency. The research is done by experiment. Cooling tower buffle are varied in plot angle which are 5o, 10o, 15o dan 20o. Water volume flow rate are varied as 50, 75, 100 and 125 ml/s. Inlet water tempersatur are varied as 50o, 60o and 70oC. The measurements are done for water and air temperature at inlet and outlet points. The result shows that buffle plot angle has effect due to cooling tower performance.

Page 38 of 46 | Total Record : 452

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