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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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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: 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.v14i1.759

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: 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.v14i1.648

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.
Simulasi Pengaruh Jumlah Palang Rim Sepeda Motor Terhadap Equivalent von Mises stress dan Safety Factor Menggunakan Software Ansys Dwilingga, I.; Sugiman, S.; Catur, A.D.
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.v14i1.786

Abstract

Rim or wheels have various types of model designs and the number of spokes. Therefore, those wheels can have a different response on each rim model when subjected to loads such as impact loads. In this simulation, impact load testing is carried out on the rim, with variations of 4 types of geometry where this geometry differs in the design of the number of spokes. By finding the Safety Factor value on each rim,  the most optimal rim design can be determined. Explicit Dynamics can solve this problem because the impact on the simulation occurs in a very short time. In this study, the design of a cast wheel type motorcycle rim with spokes number of 5, 6, 10 and 12 with a uniformly applied impact speed of 10 km/h. The rim material used was aluminum 6061 T6 and the projectile material used was aluminum alloy. The designed rim has a diameter of 35.56 cm and a width of 4.01 cm and a mass of 2415 gram. Solidworks and Ansys software based on the finite element method were used to make it easier to design cast wheel rims. By using this software, the rim can be designed so that it can be analyzed for stresses and strains that occur when simulating impact loads on the rim plane. The simulation results show that rims with spoke 10 and 12 are categorized as safe because they have a lower average stress value than rims 5 and 6 and have a Safety Factor value above 1. In other words, rims with 10 and 12 number of spokes are the optimal design in terms of cost and strength.
Pengaruh laju pemakanan proses milling terhadap perubahan temperatur pada pahat endmill karbida Putra, H.S.; Rumbiak, A.S.; Lubis, S.Y.; Darmawan, 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.v14i2.881

Abstract

Cutting Tool temperature has a significant role in the machining process in terms of tool life and workpiece properties. In dry machining process, cutting temperature condition must be monitored as excessive temperature rise can cause tool wear and damage to workpiece. Research on cutting heat has existed along with the development of metal cutting technology. Scientists have made many attempts to determine the cutting heat through theoretical analysis, numerical simulation, and experimental research. Measurement of cutting tool temperature requires a certain method because in milling process the cutting tool rotates to cut the workpiece. This research was condusted with an experimental research using an infrared thermal imager to obtain the result of carbide endmill toll in the face milling process of SKD61 (Special Kogyo Die)steel. The cutting parameters used were 1320 RPM spindle speed, 42, 98, 230 mm/min, and 0.5mm depth of cut. The milling process carried out with a time frequency of 5 minutes. The results of carbide endmill tool temperature measurement show that increasing the feed rate affects the temperature rise of the carbide endmill tool. At the feed rate of 42 mm/min, the highest temperature recorded was 152.3 ˚C, then at the feed rate of 98 mm/min, the highest temperature was 195 ˚C, and the feed rate of 230 mm/min had the highest temperature in this study, which was 219.4 ˚C.
Kinerja mesin air water harvester dengan evaporator koil pada berbagai kecepatan udara masuk Mirmanto, M.; Alit, I.B.; Maulana, A.
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.v14i1.828

Abstract

An experimental study regarding the performance of air water harvester was conducted at the natural ambient conditions. The air water harvester consisted of 3 coil evaporators and used R134a as the working fluid. The coil evaporators were constructed from copper tubes with a diameter of 6.35 mm, coil number of 26, and coil diameter of 8 cm. The air intake velocities were 4 m/s, 5 m/s, 6 m/s. The results show that the highest water mass is 1.72 kg for 7 hours at the air velocity of 6 /s, and the total heat transfer rate is 582 J/s. Increasing the air intake velocity raises the fresh water mass and the total heat transfer rate. Based on EUR the machine is not effective yet but based on the price of the water the machine gives benefit.
Variasi aktivator H2SO4 dan NaOH untuk pemurnian oli bekas dan emisi pengujian gas buang yang dihasilkan Sasmita, A.; Reza, M.; Azzahra, N.W.
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.v14i1.710

Abstract

Oil consumption has increased every year in line with the increase in used oil produced. Used oil is included in the waste of Hazardous and Toxic Materials which have a bad impact on the environment. One of the technologies that can be utilized in processing used oil is refining because used oil contains base oil so that it can be reused as fuel. This study aimed to determine the best variation of using H2SO4 and NaOH in refining used oil, then the characteristics of the refined used fuel oil are tested for density, specific gravity, calorific value, viscosity, and moisture content, as well as exhaust emissions produced. The research method used was the acid and clay method with variations of H2SO4 and NaOH with the same values of 4% (P4), 5% (P5), and 6% (P6). The results showed that P6 type fuel is the best variation that comes closest to the diesel quality standard according to the Decree of the Directorate General of Oil and Gas 146 K/10/DJM/2020. In addition, the resulting emission also has the lowest value compared to the other two variations. The density values obtained were 857 kg/m3, a specific gravity of 0.857, a heating value of 47465 kJ/kg, a viscosity of 1.24 mm2/s, and a water content of 43.887 mg/kg. Meanwhile, in the exhaust emission testing, CO emissions were 0.030%, CO2 was 4.590%, HC was 19.50 ppm, and ƛ was 2.75.
Simulasi pengaruh bentuk piston bowl dan dome terhadap perubahan sifat mekanik menggunakan software Ansys dengan metode finite element analysis Zukfikar, M.P.; Setyawan, P.D; Rachmanto, T.
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.v14i1.720

Abstract

A piston is a component of an internal combustion engine. This study numerically investigated variations in the shape of the piston head to determine mechanical changes affected by static surface pressure and temperature. The method used is FEA (Finite Element Analysis) with steady-state thermal and static structural simulations. This study aims to determine the effect of changes in the shape of the Piston Head Bowl and Piston Head Dome on the value of Von Mises stress, strain, deformation, and safety factors using Ansys software. This research was conducted numerically with a variety of concave piston heads (bowl) with surface lengths of 3 mm, 5 mm, 7 mm, 9 mm, and 12 mm with a depth of 1.2 mm and convex piston heads (dome) with surface lengths of 3 mm, 5 mm, 7 mm, 9 mm, and 12 mm with a slope of 182⁰. The results showed that the variation of piston head shape affects the value of von Mises stress, strain, deformation, and safety factor. where the convex piston head (dome) has a lower von Mises stress value and maximum strain than the concave piston head (bowl), the deformation value of the dome piston head is higher, and the minimum safety factor value of the dome piston is higher. The lowest Von Mises stress value is 611.42 MPa on the piston head dome, the maximum strain value is 0.007741, the highest maximum deformation value is 0.055 mm on the piston head dome with a surface length of 12 mm, and the best minimum safety factor value is 0.515 on the piston head dome.
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: 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.v14i2.845

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.
Analisa sifat mekanik material logam melalui pemodelan dan simulasi uji tarik berdasarkan metode elemen hingga Susanto, A.; Mahendra, M.T.; Andriyani, R.P.
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.v14i1.824

Abstract

Mechanical properties of material are attributes that should be known by engineers and product designers to determine the suitability of the structure being designed. One of the ways to determine the mechanical properties of a material is generally conducted by well-known tensile test. By the test, it will inform the elastic, plastic and fracture areas are known in the strain-stress diagram. Apart from that, the yield strength and maximum tensile strength can also be observed. The obstacle factor in experimentally tensile testing is the expensive costs, both for renting and procuring a tensile testing machine, which is called universal testing machine (UTM). This research aims to provide an alternative tensile test method, namely modeling and simulation techniques based on the finite element method (FEM). The workpiece material applied was ST37 Steel. This material is widely utilized in various types of industry, including the automotive, railway, and construction industries. The results show that the simulation can display all events that tensile tests may not be able to display experimentally, such as information on stress distribution and also elongation during the test. In addition, the mechanical properties of the ST37 material were obtained, including the yield strength of the material (yield point, Y) and the maximum tensile strength (ultimate tensile strength, σmax) which were 812.3 and 928.1 MPa, respectively.
Evaluasi perpindahan panas dan efisiensi superheater pada unit multi fuel boiler Panjaitan, J.R.H.; Sihotang, J.S.; Sirait, K.M.; Pakpaha, R.
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.v14i1.761

Abstract

The heat exchanger was used to carry out the heat exchange process between two fluids. One of the heat exchangers is the Multi Fuel Boiler. In multi-fuel boilers, there was a superheater which functions to convert saturated steam into dry steam. In this research, the evaluation of superheater heat transfer efficiency in Multi Fuel Boiler Units will be studied. The results showed that the highest heat transfer coefficient for the superheater was on day 6 at 141,942.81 W/m2K with 56.51% efficiency. Meanwhile, the highest superheater efficiency was 58.72% on day-7 with the heat transfer coefficient being 130,755.76 W/m2K. Factors such as steam temperature, flue gas temperature, steam and flue gas flow rate, heat transfer area and soot blower influence the heat transfer coefficient and efficiency of the superheater.

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