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Jurnal Mekanikasista
Published by PPM Sdirjianbang Akademi Militer
ISSN : 23547308     EISSN : 29635365     DOI : -
Core Subject : Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Mekanikasista jurnal yang mempublikasikan dan mewadahi hasil penelitian bidang teknik mesin yang berkaitan dengan perkembangan teknologi miiter yang berfokus pada teknik mesin secara umum. Jurnal ini mempublikasi hasil penelitian yang dilakukan civitas Akmil ataupun berkolaborasi dengan institusi di luar Akmil. Penulis dalam jurnal ini terdiri dari Dosen, Praktisi dan Taruna. Semua hasil penelitian yang akan dipublikasi harus melewati proses review oleh reviwer sebagaimana telah di juntuk, tugas dan janggung jawabnya oleh Penangung Jurnal Mekanikasista. Terbit dua Kali dalam setahun pada setiap bulan Nopember dan Mei
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 6 Documents
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Search results for , issue "Vol. 11 No. 1 (2023): NOVEMBER 2023" : 6 Documents clear
ANALISIS AIRFOIL (SAYAP PESAWAT) TERHADAP COEFESIEN LIFT (CL) DAN COEFESIEN DRAF (CD) DENGAN VARIASI KECEPATAN UDARA Sukahar; Achmad Hafid; Edy Budi Santoso
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Aerodynamic characteristics are a very important thing in the field of aerodynamic application science which is intended to obtain maximum performance from an object shape. This analysis was carried out to determine the effect of fluid flow velocity on symmetrical model aircraft wings. In this research, analysis of aerodynamic characteristics was carried out by testing an object in the form of a symmetrical model of an airplane wing that was supplied with air using a Wind Tunnel and Smoke Tunnel, so that the comparison and air flow produced could be seen. In connection with this, it is certain that we will not be separated from the topic of aerodynamics which is closely related to the characteristics of the object when flying in the air, which in the end will be able to draw conclusions regarding the aerodynamic characteristics of the object. In this final assignment, what will be discussed further are the aerodynamic parameters which in the world of aviation we usually know as the lift coefficient and also the drag coefficient. The method used is the simulation analysis method. The simulation was carried out by making a symmetrical aircraft wing model, then testing it using the Wind Tunnel and Smoke Tunnel tools. The purpose of this analysis is to determine the pressure characteristics of fluid flow on a symmetrical aircraft wing with a speed of 20 m/s and variations in angle of attack ranging from -20°, -10°, 0°, 10°, and 20° to the lift coefficient and drag coefficient and to determine the effect on each wing of a symmetrical model aircraft given speeds ranging from 12 m/s, 16 m/s, and 20 m/s which are fed by air in a wind tunnel using the drag coefficient and lift coefficient methods.
ANALISIS PENGGUNAAN BUSI RACING TERHADAP UNJUK KERJA MESIN TOYOTA AVANZA 1300 CC Budi Harjanto; D.Ricky Lumintang; Edy Budi Santoso
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

To overcome this is certainly a need to increase engine performance either by the use of spark plugs can improve the performance of a gasoline engine. Thus improve fuel efficiency and reduce exhaust gas emissions such vehicles. In the spark ignition engine, the spark plug serves to provide a gap in the combustion chamber so that high-voltage electrical pulses to flow out which will further ignite the mixture in the surrounding areas and then move extends throughout the mass of the mixture in the combustion chamber. No wadays many emerging racing spark plugs are made of iridium alloy with a variety of brands that can improve performance and reduce fuel consumption and exhaust emissions.Test object used is the official vehicle of Toyota Avanza 1300cc. In this study, the machine uses an ignition angle 120 and the fuel used is pertamax octane 92. To determine the increase in torque, power, specific fuel consumption and thermal efficiency of the engine speed is used varies from 1800 rpm, 2000 rpm, and up 2300 rpm.Results showed increased engine performance along with increasing rpm. However, a significant improvement and efficient is shown at speed below 2500 rpm in the use of a standard spark plug of 7,852 kg.m torque, 21,96 PS of power, 0,225 specific fuel consumption, and 26,25% of the thermal efficiency at speed 2000 rpm. This is due to the condition of the test equipment used is relatively old and his condition is not normal that rotation variation used is limited, only at low speed only while iridium spark plugs itself will achieve peak performance and efficient in fuel consumption in high rotation above 6000 rpm. Therefore the use of standard spark plugs is more effectively used on the machine Toyota Avanza 1300cc because the machine is a machine with low compression with factory setting (standard) so it is not compatible when using modern spark plugs with high technology such as racing spark plugs.
ANALISIS PENGKONDISIAN UDARA AC TERHADAP BEBAN PENDINGIN PADA MOBIL DAIHATSU FEROSA Aryananta Lufti; Budi Harjanto; Suparyana
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

There are components in a vehicle that are supporting components that are important in driving comfort that the air conditioning system components, air conditioning systems is something that appeals to the vehicle due to the kind of machine that works following the thermodynamic cycle. Air-conditioning or airconditioner in passenger cars, usually used to control the temperature of the moisture so the air remains fresh and clean. The main source affecting the cooling load is derived from direct solar radiation and also of the rider or passenger. The purpose of this planning design alone - the eye to provide a basis for estimating the thermal load in the vehicle cabin. From the calculation of the load, the cooling capacity can be calculated so as to enable us to know the size of the cooling load in need. The scope includes design planning of the outdoor heat load that includes loads of heat from sunlight through glass windows as well as loads of heat from sunlight through the walls or roof, while for the heat load of the room includes heat load of the occupants of the room. The amount of cooling load occurs in accordance with the geometric size of the car that is designed for 6 people was 3.66 kW. This burden is still able to be solved by setting the engine coolant, which for the overall heat that can be absorbed by the cabin was 5.26 kW.
PENGARUH SIFAT FISIS DAN MEKANIS DISC BRAKE SETELAH DIPANASKAN 2000 C PADA TRUK UNIMOG Sukahar; Achmad Hafid; Suparja
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

This research is about analysis physical and mechanical character of Truck Unimog disc brake after heated with 2000C. The purpose is considerate for TNI-AD leader specifically for squad the apply and use to overcome the weakness of disc brake. Weighing 7,5 tons, Unimog mobility is fairly high, this truck with 60000 cc capacity engine can through the field very well as towing cannons truck and have reliable power to through altitude and rugged terrain. Common cause frequent fractures until crooked of disc brake part there at time the truck doing mobility with fast and long through time, and when hit by hard object in the field of Indonesia have many rocky terrain, hills, hard soil structure, as well as weakness material of that disc brake. Therefore at the Unimog truck disc brake it will be tested about microstructure, disc brake material composition and hardness. Be based the result of disc brake, evenly this material having hardness value before heated is about 236, 213 kg/mm2 and after heated is 275, 318 kg/mm2 where more and more result has gotten, and then more and more hardness too that material. And in this test a steel disc brake after heating 2000C has a greater value in comparing pre-heated it is clear that the steel brake disc is resistant to heat and friction. so that the future does not happen again broke or bent the brake disc so that it is not an accident or accident that occurred at the time of mobility and the driver can easily operate these vehicles is that the brake disc can work well then the user not to place excessive heat later also necessary maintenance and routine and periodic maintenance of the braking system, especially on the brake lining and brake disc so as to prevent damage to both the brake disc itself or on the vehicle.
PENGARUH PENGGUNAAN EXPANSION VALVE BERBAHAN DASAR MATERIAL DENGAN KONDUKTIVITAS RENDAH TERHADAP PERFORMA AC MOBIL DINAS TNI-AD JENIS ISUZU PANTHER DENGAN VARIASI BEBAN PENDINGINAN Heri Wijanarko; Sugihandoko; Sukahar
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Comfort in a vehicle usually uses an air conditioning system. AC is a type of machine that works following a thermodynamic cycle, namely the vapor compression cycle. A refrigeration machine depends on the ability of the compressor to meet the amount of refrigerant gas that needs to be circulated. The compressor is a tool for pumping cooling material (refrigerant) so that it continues to circulate in the system. The performance of the car's AC compressor is controlled by the thermostat, where the thermostat signals whether it is active or not active depending on whether the temperature in the car has been reached or not.This research includes variations in cooling load with a fixed compressor rotation of 759 RPM, each variation of cooling load is tested with a fixed compressor rotation of 759 RPM using one R-134a refrigerant to determine the COP, then this research is continued by calculating the on-off time of the compressor. to save energy used.The results of the research carried out show that the greater the cooling load, the greater the compressor inlet pressure and compressor outlet pressure (∆P = P1 – P2).
PENGARUH PROSES QUENCHING DAN HEATTREATMENT PADA VELG BESI MOBIL TOYOTA KIJANG LGX Bambang HP; Achmad Hafid; Aryananta Lufti
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Iron precious metals have been used since antiquity, although those with lower melting points, which were used earlier in human history, pure iron are relatively softer but cannot be obtained through smelting. This material hardens and is significantly strengthened by carbon impurities, especially in the smelting process. With a certain proportion of carbon (between 0.002% and 2.1%) it will produce harder steel than pure iron which may reach 1000 times. Iron compounds have many benefits in daily life. Iron has a very high economic value so many people make iron as a business land. Most of the usefulness of iron is in the world of construction. Many material elements are used in the world of iron-based construction because the strength of the modified iron is more beneficial and useful. This is because the cast properties of this alloy are classified as good, in addition to corrosion resistance and easy to process machines, alloy types this is widely used in the automotive industry object used is the LGX Toyota kijang alloy wheels. In this study, to obtain data, several tests were carried out, namely Heat Treatment, Quenching, Aneling, composition testing, and tensile testing. The results showed that the effect of heat treatment and quenching on iron alloy specimens was the increase in the value of hardness and tensile strength values, when compared with non-heat treatment specimens. While the strength of the pulses is not measurable because the specimens are too brittle .

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