Garuda - Garba Rujukan Digital

ANALISIS AIRFOIL (SAYAP PESAWAT) TERHADAP COEFESIEN LIFT (CL) DAN COEFESIEN DRAF (CD) DENGAN VARIASI KECEPATAN UDARA Sukahar; Hafid, Achmad; Budi Santoso, Edy
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v11i1.136

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.

PENGARUH SIFAT FISIS DAN MEKANIS DISC BRAKE SETELAH DIPANASKAN 2000 C PADA TRUK UNIMOG Sukahar; Hafid, Achmad; Suparja
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v11i1.139

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 PROSES QUENCHING DAN HEATTREATMENT PADA VELG BESI MOBIL TOYOTA KIJANG LGX HP, Bambang; Hafid, Achmad; Lufti, Aryananta
JURNAL MEKANIKASISTA Vol. 11 No. 1 (2023): NOVEMBER 2023
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v11i1.141

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 .

ANALISIS PERBANDINGAN SIFAT FISIS DAN MEKANIS PADA PISTON MOTOR PRODUK CHINA (KANZEN) DAN MOTOR PRODUK JEPANG (HONDA GL) Sukahar; Hafid, Achmad; Suparja
JURNAL MEKANIKASISTA Vol. 11 No. 2 (2024): MEI 2024
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v11i2.185

This research is about comparing the physical and mechanical properties of motorbike piston made in China (Kanzen) and motorbike pistons made in Japan (Honda GL). The aim is to find out which material structure is better between motorbike piston made in China and motorbike piston made in Japan. Because in field use Japanese motorbike pistons are superior to motorbike piston made in China.The piston is an engine component that changes or transfer combustion pressure into straight motion (sliding) which then, through the piston rod, piston rod and crankshaft, converts the straight motion of the piston into rotary motion. This piston has an aluminum alloy composition with the dominant elements, namely Mn, Zn, Ti, Cr, Pb, and Sn.From the test of the material composition of these two pistons, the material elements are almost the same, but the Honda GL motorbike pistons is better than the Kanzen motorbike pistons, judging from its elements. From the hardness test, it turns out that motorbike pistons made in China (Kanzen) are superior to pistons made in Japan (Honda GL) but that doesn’t mean that hard is good for the piston, then from the micro structure the piston of Japanese motorbikes (Honda GL) are better than Chinese motorbikes (Kanzen) because the crystals spread out so that they can cause cracks in the piston more quickly.

ANALISA PERBANDINGAN PENGGUNAAN BIODIESEL DAN DIESEL SHELL TERHADAP UJI PRESTASI MESIN DIESEL PADA ISUZU PANTHER 95 Sukahar; Hafid, Achmad; Suparja
JURNAL MEKANIKASISTA Vol. 12 No. 1 (2024): NOPEMBER 2024
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v12i1.237

The engine capacity of a vehicle, especially a diesel engine, is greatly influenced by the fuel used, in this case the diesel used. What is meant by engine capacity is the performance produced by the engine, including the power produced by the engine, the specific fuel coefficient, and others. Therefore, choosing the right diesel will certainly make the engine able to produce good performance but diesel consumption remains efficient. So an alternative replacement is needed when the diesel runs out, one of which is using biodiesel. Biodiesel is a fuel made from base oil or renewable oil sources that are transesterified lipids into the desired ester by removing fatty acids. So biodiesel is the closest alternative to replacing fossil fuels which are the main source of transportation energy. Based on the test experiments of diesel engine performance using biodiesel and Shell diesel, namely at 2500 rpm, 2300 rpm, 2000 rpm, 1800 rpm, and 1600 rpm, there are differences in engine performance, although not significant, but can still be used as a guideline for choosing the right fuel, especially for vehicles in the Indonesian Army and if later biodiesel is known to the wider community, it can be used as an alternative fuel and can be considered to be used as fuel for diesel vehicles in the Indonesian Army.

PERANCANGAN ULANG SISTEM SUSPENSI SHOCKBREAKER PADA KENDARAAN BIMANTARA NENGGALA Sukahar; Hafid, Achmad; Suparja
JURNAL MEKANIKASISTA Vol. 12 No. 2 (2025): MEI 2025
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v12i2.309

This study focuses on redesigning the shock absorber suspension system of the Bimantara Nenggala vehicle, which is used as a service vehicle at the Military Academy, to enhance durability on rough road surfaces. The modification was carried out by increasing the diameter of the steel spring wire from 14 mm to 16 mm. The results indicate that this change increased the solid length of the spring from 56 mm to 96 mm, the number of coils from 2.5 to 4.5, and the spring deflection from 39.38 mm to 41.48 mm. This redesign demonstrates that using a 16 mm wire diameter provides better performance compared to the 14 mm wire, with improved durability, deflection, and coil count for optimal suspension efficiency.

ANALISIS STAKEHOLDER DALAM PROGRAM SWASEMBADA PANGAN DI WILAYAH (PROGRAM UPSUS PAJALE DI KABUPATEN BENGKULU UTARA) Hafid, Achmad; Munandar, Adis Imam
Jurnal AGRISEP JURNAL AGRISEP VOL 18 NO 01 2019 (MARCH)
Publisher : Badan Penerbitan Fakultas Pertanian, Universitas Bengkulu

This study aims to determine the role and level of importance, level of strength and level of legitimacy in food self-sufficiency programs implemented in the region. Food self-sufficiency is a food security program that is very important so that the program involves many stakeholders and the role of each stakeholder in the success of the program. This study uses a stakeholder management approach in the data analysis used. This research was conducted in North Bengkulu Regency in the UPSUS PAJALE program. The results of the study are the role of the local government stakeholders, the Food Crops and Extension Agency has a high level of importance, strength and level of legitimacy compared to other stakeholders so that the level of coordination and collaboration between stakeholders is needed so that the UPSUS PAJALE program can run smoothly and successfully.

ANALISIS PERBANDINGAN UJI KEAUSAN ANTARA KAMPAS KOPLING KUALITAS 1 DENGAN KUALITAS 2 PADA KENDARAAN SUZUKI KATANA Sukahar; Hafid, Achmad; Suparja
JURNAL MEKANIKASISTA Vol. 13 No. 1 (2025): NOVEMBER 2025
Publisher : PPM Sdirjianbang Akademi Militer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63824/jtmp.v13i1.391

To support high mobility and varied terrain, vehicles must have optimal engine performance, especially in the clutch system, which is prone to slipping due to clutch lining wear, increasing the risk of accidents. This study analyzes the wear level of Suzuki Katana clutch linings by comparing KW 1 and KW 2 through hardness, wear, and carbon content tests. The results indicate that KW 1 has a hardness of 251.34 kg/mm², higher than KW 2, which is only 67.82 kg/mm². The wear value of KW 1 is 0.003×10⁻⁴ mm³/kg.m, lower than KW 2 at 0.0086×10⁻³ mm³/kg.m. The carbon content in KW 1 reaches 44.0739%, higher than KW 2 at 32.3462%. These findings show that the higher the hardness of the clutch lining, the lower its wear rate, making KW 1 a better choice as it is more durable and resistant to wear.

Title

Found 8 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 8 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 8 Documents
Search