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PROGRAM STUDI TEKNIK MESIN - JURUSAN TEKNIK MESIN DAN INDUSTRI - FAKULTAS TEKNIK - UNIVERSITAS SYIAH KUALA, Jln. Syech Abdul Rauf, No. 7, Darussalam, Banda Aceh 23111, Aceh INDONESIA
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INDONESIA
Jurnal Teknik Mesin
Published by Universitas Syiah Kuala
ISSN : 23018224     EISSN : 26230747     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 106 Documents
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Pengembangan Algoritma untuk Menganalisis Frekuensi Pribadi Poros dengan Rotor Ganda Amir Zaki Mubarak
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Vibration analysis is very essential to be considered in designing a rotor shaft. By the development of computer technology, the vibration analysis of the rotor shaft can be easily performed by numeric method. The objective of this research is to develop an algorithm to determine the natural frequency of a rotor shaft of a dual rotor system. The equation of motion of the system is derived from the kinetic and potential energy. By applying Lagrange’s equation and converting them into matrix form, the equations can be easily solved numerically. Through this approximation is developed computer program. The model is a rotor system built of a rotor shaft and two disks. The rotor shaft is numerically divided into several line elements. From the global matrices of the elements, it is resolved the eigen values of the system which are then converted into the natural frequencies. The validation of the program result with analytical calculation shows a very close result.
Studi Perencanaan, Pembuatan Dan Pengujian Turbin Aliran Aksial Head Rendah - Mursalin; Ahmad Syuhada; - Hamdani
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

The study is done to get an axial low head turbine design that gave good performance by using flat blade to further simplifying manufacture. The study is consists of three stages. First, designing an axial low head turbine. Second, manufacturing it and the last, testing on turbine performance. The testing that conducted to 3 m head use three kind of discharges, 0,14 l/s, 0,12 l/s, and 0,10 l/s. Three kinds of runners with blade angle, 30o, 35o, and 40o are also use in the testing. Based on the result of the test, it is known that the best efficency, 76%, turbine rotation on 613 rpm and power 2,013 kW is given by the blade angle 40o.
Karakteristik Alat Uji Sistem Pendorong pada Autonomous Underwater Vehicle (AUV) Muhammad Tadjuddin
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Aceh marine area has many potential resources that need to be explored, studied, and conserved. These activities require a suitable mean that has capability to bring data collection and observation tools into the seabed. One of the means that can carry out these jobs is the AUV (Autonomous Underwater Vehicle). AUV has an ability to dive without any supporting cables from the surface. It can be programmed to do the required task in the seabed. One of the most important parts on the AUV is the thruster system, a component that provides the thrust force. A thruster is a mechatronic device consists of power source (battery), motor controller, electric motor, and propeller as the main thrust component. A defect in the thruster design will result in the failure of the AUV thus the design of thruster is critical in an AUV unit. In this research, an experiment apparatus was design and fabricated in order to measure the performance of a thruster. The measurement includes the thrust force, the power consumption, and the total effective working time. The proposed experiment apparatus is expected to assist the design stage of the AUV before fabrication in order to minimize the failure caused by defect in the thruster system.
FEM Simulation of Polycarbonate Alloys-made Sheet under a Drop Weight Impact Test: Deformation and Failure Performances M. Nizar Machmud; Zahrul Fuadi
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

This paper presents a study of deformation and failure performances of a plastic sheet made of polymer alloys subjected to drop weight impact of a cylindrical mass with hemispherical tip at a certain velocity by using dynamic explicit finite element code of MSC. Dytran. An available material model in the finite element system, called piecewise linear plasticity, was applied in the simulation for describing the large strain, non-linear behavior of the polymeric materials. Maximum plastic strain failure criterion was used to simulate the impact failure. In the simulation, the mass served as a rigid surface strikes perpendicularly the potential impact region of an arbitrary designed- plastic sheet that was considered in the form of a fully-clamped circular thin plate. Contact between the mass and plate was applied and friction coefficient m between the mass and plate was assumed to be a constant value of 0.3. In order to study effect of the assumed friction coefficient value, additional simulations of the impact test have been performed using m = 0. Some limitations in the use of the material model were illustrated through the analysis of results from two types of tough polycarbonate (PC) alloys: PC/ABS and PC/PBT blends. Impact force-displacement relationships of each alloy were then compared to the test result.
Studi Konduktivitas Panas pada Papan Partikel - Ramadlan; Ahmad Syuhada; Zahrul Fuadi
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Abstract

The purpose of this study is to determine the effect of variations in the use of fillers for particle board. Various composition of fillers from rice husk and wood sawdust were mixed with synthetic glue matrix of PVAC (Poly Vinyl Acetate Co-Acrylic) and port land cement to produce the particle board. Their effects to the thermal conductivity of particle board (fiberboard) is analyzed. Four walls of particle boards of 25 cm2 were installed in the specialy prepared test apparatus. The measurements were conducted for the surface temperature outside and inside with the measurement interval of  70 minutes. From the results of measurements, the smallest thermal conductivity property is given by kayu jati sawdust with a conductivity of 0.020 W/m0C. Rice husk particle board has a conductivity of 0.024 W/m0C, while the highest conductivity is given by rice husk bran particle board, which is 0042 W/m0C.
Analisis Unjuk Kerja Kompresor Sentrifugal Pada Unit Flare Gas Recovery PT. Arun NGL Teuku Juliadi; Ahmad Syuhada; - Hamdani
Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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Abstract

PT. Arun NGL has made various efforts torecover losses of energy and water resources during the production process. One of the main focuses for energy conservation is flare gas recovery unit. The flare gas recovery system proposed is skid-mounted type. The primary equipments consists of two compressors that compress the gas from the flare header gas upstream liquid seal drum. The gas is then cooled for reuse in the fuel gas system. The flare gas compressor often experience surge problem due to compressor operating at low flow so that the pressure decreased dramatically while compressor head system stays at high pressure. The compressor playsan important role in generating high-pressure fuel gas. If the compressor is not able to produce enough pressure as required, the production of fuel gas will be disrupted.This analisis focused on the calculation the compressor performance, head, capacity efficiency, and compressor power. Based on the analisys, it is obtained that the flow capacity is 3500 m3/hr, head compressor is 5700 kJ/kg, and the compressor power is 9000 kW. The results show that the operating condition is still whitin the surge limitation.
Low-frequency Stick-slip of A Creep Groan on A Simple Caliper-slider Experimental Model Zahrul Fuadi
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
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Abstract

This paper discussed a preliminary study of low-frequency stick-slip of a creep groan using a simple caliper-slider model. The experiment model is constructed based on the real operating system behind a vehicle braking system. The model consists of a sliding bar, a caliper and an arm. The analysis shows that the main frequency of generated low-frequency stick slip of the creep groan is 100 Hz with sound pressure level of 70 dB. It is found that the low-frequency stick-slip motion the result of the vibration in tangential direction. The frequency of the generated stick-slip is close to the bending natural frequency of the system. Several parameters that are important in the generation of the low-frequency of stick –slip are the sliding velocity and the contact roughness. Therefore, further study of creep groan should take into account these important parameters as well as other operating parameters.
Perancangan Turbin Francis untuk Pembangkit Listrik Tenaga Minihidro di Lhok Sandeng Kabupaten Pidie Jaya - Azwinur; - Hamdani; Ahmad Syuhada
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Abstract

The increase of population, followed by the increasing growth of the industry led to high demand of electricity. Many different ways have been done to find and use natural potential as electrical energy that can be used. The potential energy of water is one of the energy that can be converted into electrical energy maximally. One of still unused water potential energies is the water of Krueng Meureudu in Pidie Jaya. The river location is in Lhok Sandeng village, Meurah Dua sub district, Pidie Jaya. The width of the river ranges from 30 to 50 meter with the debit of about 10÷15 m3/ s. This can be used to generate electricity using Francis type water turbines to meet the energy requirements of the surrounding population. The first step in designing the turbine is to determine the turbine type based on the value of specific rotation (Ns) obtained from the head (H) and debit data (Q). Then, the design of main components, which are runner, shaft, spiral casing, guide vane and draft tube. Thus, based on the calculation, the dimensions and designs of the main components of the Francis turbine are obtained.
Modeling of Underground Heat Exchanger for Heat Pump and Air Conditioning Systems Sarwo Edhy S
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Air conditioning and heat pump systems can use the ground as a medium to dump or absorb heat energy to increase efficiencies. As compared to the air, the ground has lower temperature in the summer and higher in the winter. In this research, the vertical U tube underground heat exchanger that can be used to harvest geothermal energy, has been modeled by using two dimensional finite difference methods. The model is not only able to estimate the water temperatures out of vertical U tube underground heat exchanger, but also capable of calculating the temperature profile change of surrounding soil under various water entering heat exchanger and weather conditions. The heat transfer process between the underground heat exchanger and soil has been investigated and profiles of soil and water temperatures are presented.
Pengaruh Waktu Tahan pada Perlakuan Panas Pasca Pengelasan terhadap Kekerasan dan Kuat Tarik Baja Karbon ASTM A106 Grade B M. Nizar Machmud; Defri Maulana; - Husaini
Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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Abstract

Experimental investigations to study significant effects of employing a post weld heat treatment (PWHT) technique on mechanical properties of the welded carbon steel have been performed. This paper presents a study on hardness and tensile strength characteristics of a carbon steel A106 grade B welded using shielded metal arc welding (SMAW) method with employing normalizing procedures. With the PWHT technique, heating temperature of the steel, that was set up to 850°C, was then maintained for these following set of holding times: 10, 20 and 30 minutes before cooling. Heating and cooling rates of the carbon steel were also slowly maintained. Investigation results under tension showed that the tensile strength of the carbon steel decreased with increase of the holding time. The best tensile strength was achieved by the carbon steel treated with a holding time for 20 min. Toughness of the carbon steel under tension is also discussed in order to correlate the influence of employing the PWHT technique on their fracture modes. Investigation with Vickers hardness test showed that the Vickers hardness on weld metal, weld line, heat-affected zone (HAZ) and base metal of the welded carbon steel, respectively, decreased and tended to be equivalent with the increase of the holding time.

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