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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 12 Documents
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LAJU PEMBUANGAN PANAS PADA RADIATOR DENGAN FLUIDA CAMPURAN 70% AIR DAN 30% RADIATOR COOLANT DENGAN RPM 2000 TOYOTA AVANZA Heri Wijanarko; Sugihandoko; Suparyana
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Cars that are used to travel long distances are usually driven at a fairly high speed with engine speed ranging from 2000 rpm and in a fairly long period of time. In order not to happen things that are not desirable due to the engine temperature exceeds the normal temperature of the machine when working, then this study needs to be done. In this study conducted comparative testing of engine heat dissipation rate between the use of 100% water with a mixture of 70% water and 30% radiator coolant with paired comparison method at rpm 2000. From the research, data were taken, among others, the temperature of the radiator Inlet and outlet, and the volume of radiator fluid flow (Q) which is then processed data to determine the mass flow rate (m), the specific heat of the fluid (Cp), the rate of heat dissipation radiator (q), and statistical data processing. The results of testing of a mixture of 70% water radiator fluid and 30% radiator coolant showed an average difference between the inlet temperature of the radiator with a higher radiator outlet temperature of 4.7250 C and the average heat dissipation rate of the radiator is also higher at 8.02931 kJ/s. This condition shows that at 2000 rpm, a mixture of 70% water and 30% radiator coolant has a higher engine heat absorption and dissipation capability than 100% water.
PERANCANGAN KATROL PADA CRANE PORTABLE KAPASITAS 300 KG GUNA ALAT BANTU DI BENGKEL PERALATAN AKADEMI MILITER Juniarto Satryo; Sukahar; Suparyana
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Military Academy equipment workshop one of the main tasks is to carry out the supply and maintenance of weapons, munitions and vehicle commodities to support the smooth running of education in the Military Academy environment. In the maintenance of vehicles often found a damaged vehicle engine so it needs to be repaired by lowering the vehicle engine. One of the tools needed is a crane. Crane is needed to move an item from one place to another. In the design of making this portable crane using steel rope type calculation according to United Rope Works Standard, Rotterdam Holland. Where the weight of the cargo lifted on this plan is 300 kg. Because the lifting is influenced by several factors, such as overload, dynamic conditions in operation and unexpected air changes, it is estimated that the additional load of 10% of the original load so that the weight of the cargo lifted to 330 kg. The maximum allowable stress value of steel rope is 362.946 kg, the permissible tensile stress is 59 kg/mm2, the cross-sectional area of steel rope is 0.088 cm2, the tensile stress that occurs on the rope is 41.24 kg / cm2. The calculation results are based on the selected type of steel rope according to United Rope Works Standard, Rotterdam Holland, which is 6 x 37 +1 fiber core. it is expected that planning steel rope is safe to use because the planned maximum tension (S) is smaller than the permit maximum tension ( S ) i.e. : 362.946 kg < 433.33 kg. And the planned tensile stress is smaller than the allowable tensile stress is : 41.24 kg/mm2< 59 kg/mm2.
PEMBUATAN ETHANOL GEL SEBAGAI BAHAN BAKAR ALTERNATIF PENGGANTI BAHAN BAKAR PADAT PARAFIN DI MEDAN LATIHAN Sukahar; Achmad Hafid; Suparja
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Bioethanol is a potential alternative fuel because the source is easily renewable. However, the use of bioethanol as a fuel substitute for kerosene is still rare. This is due to the plant that produces bioethanol is limited and constrained when the distribution is easy to spill. In addition, liquid bioethanol is more at risk of spilling and exploding easily because of its volatile nature to overcome these problems, liquid bioethanol is converted into gel bioethanol. This study aims to find the effect of water and carbopol on flash point, calorific value, and viscosity of bioethanol gel produced. The control variable in this study is bioethanol 90% (weight); stirring time is 1 hour and the variable is carbopol 0,85% ; 1,05% ; 1,25% (% weight and water 7,5% ; 7,9%; 8,3% (% weight).The Data in this study will be processed using the Surface Response method to obtain the results of the influence of each variable on the bioethanol produced and optimum operating conditions.From the research obtained, flash point is influenced by the percentage of water and the percentage of carbopol; calorific value is influenced by the percentage of water, the percentage of carbopol, and the interaction of both; viscosity is influenced by carbopol. Optimum flash point value of 21 0C and optimum calorific value of 4000 cal/g obtained under operating conditions the percentage of water is 7.9% and the total percentage of carbopol 1.09%.  
PENGARUH PENGGUNAAN EXPANSION VALVE BERBAHAN DASAR MATERIAL KONDUKTIVITAS RENDAH TERHADAP PERFORMA AC MOBIL DINAS TNI-AD JENIS ISUZU PANTHER Bambang HP; Taufan Tjandra_Kusuma; Suhendro Oktosatrio
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Comfort in vehicles is usually by using a conditioning system (Air Conditioning system).AC is a type of engine that works that follows the 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. Compressor is a tool for pumping refrigerant (refrigerant) to keep circulating in the system. The performance of the car air conditioning compressor is controlled by a thermostat, where this thermostat gives an active or inactive signal adjusted in the car temperature has been reached or not the temperature in the car. This study includes variations in cooling load with a fixed compressor rotation is 759 RPM, each variation of the cooling load is tested with a fixed compressor rotation of 759 RPM by using one refrigerant R-134a to determine the COP, then this study continued by calculating the time of life and death of the compressor to save energy used.The results of the research conducted that the greater the cooling load, the pressure in the compressor and the pressure out of the compressor (3P = P1 – P2 ) the greater.
PENGARUH LOKASI KETEBALAN MAKSIMUM AIRFOIL SIMETRIKAL TERHADAP COEFFICIENT DRAG DAN COEFFICIENT LIFT PADA MAIN ROTOR HELIKOPTER BELL 412 Indra Diantoro; Ardianto Darmanto; Lalu Saefullah
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

The principle of objects that can move or forces arising from the movement between an object and air is studied in the science of aerodynamics. Great pressure and speed are gaining the science of aerodynamics. In this study, the analysis of aerodynamic characteristics is carried out by testing the object in the form of a model of an aircraft wing or airfoil of similar shape with 3 types of different thicknesses in small scale sizes. The three models were tested using wind tunnel and smoke tunnel to see the resulting air flow and the resulting lift force comparison.In this final project that will be discussed further is the influence of aerodynamics in the world of aviation we are familiar with the coefficient of lift, the coefficient of drag force and also the distribution of the resulting pressure.The method used is simulation analysis method. Simulation is done by making a model of a similar-shaped aircraft wing with a thickness of 15%, 20% and 30%, then tested using a Wind Tunnel and Smoke Tunnel.The purpose of this study was to determine the results of the study variations in the maximum thickness of the symmetrical airfoil using a fixed speed of 20 m/s and an angle of attack of-9o, -6o,-2o 0o, 5o, 10o, 15o against the coefficient of lift, drag coefficient and the maximum pressure distribution.
PERANAN UDARA PANTAI TERHADAP KOROSI BALING-BALING HELIKOPTER HUGHES-300C Aryananta Lufti; Budi Harjanto; Frangky Silitonga
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

The purpose of this study includes three important things, including the effect of coastal air on the coastal environment, corrosion rate, and hardness of the Heli Hughes-300C propeller. The method used is a qualitative approach using a corrosion rate measuring device, namely Cell 3 Electrodes with liquid seawater from Maron Beach, Semarang as a corrosion medium. Each specimen will be tested for composition, calculated corrosion rate and tested for hardness. Specimen Making: Specimen making for this test was carried out by taking part of the Hughes 300C Helicopter propeller and then forming it to the size of the tube. Composition test: The composition test was carried out at the UGM Engineering Materials Laboratory using a spectrometer. Based on the results above, it was found that the Hughes 300C propeller after being corroded had a higher hardness value (average VHN 135.75kgf/mm2) compared to the one before it was corroded (average VHN 128.79 kgf/mm2). These results indicate that the propeller after being corroded will be more rigid, where there is a shift in the hardness standard value of the propeller. A brittle propeller will break more easily when it hits a hard impact in the air compared to a low-friction propeller due to the movement of the flap on the propeller when the blade angle changes and the push from the wind when flying.
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.

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