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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 7 Documents
 1 
Search results for , issue "Vol 1, No 1 (2012)" : 7 Documents clear
Pengaruh Komposisi Paduan Al-Si Terhadap Kerentanan Hot Tearing - Akhyar; - Suyitno
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Hot tearing and hot cracking is a metal alloy casting product defects caused by several factors such as alloy composition, casting temperature, mold temperature, mold shape and even casting system itself. The study has been developed to find the phenomenon of the hot tearing by varying the alloy composition, techniques and methods. Increasing Si alloy composition can improve hot-tear, mold modification CRCM (constrained Rod Casting Modified) Horizontal method can be used to analyze the hot tearing. The material used is aluminum with Si composition is 0.24pwt as base and material ADC12 as additive with Si composition is 10.56pwt to increase Si composition. Hot-tearing sensitibility value obtained by using the equation then showing into the chart HTS footprint. HTS values ​​for Si alloy with a composition of 0.24pwt is 12 and the HTS value for alloys with compositions 1.05pwt Si is 18. Cracks formed in the product starting with the smooth (hairline cracks) category to the complete (specimen broken) category. The higher Si content can increase the cracked in product castings, so that the higher Si composition more tendency to tear.
Kaji Optimasi Desain Cetakan Injeksi Moulding pada Unit Pengolahan Limbah Plastik Dinas Kebersihan dan Pertamanan Kota Banda Aceh Masri Ibrahim; - Irwansyah; Eddi Safrizal
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

High impact of product damage by injection molds process on polymer waste processing unit was seriously affected to quality and sustainability production. In this study effect of injection mold design was minimized by investigated and redesign injection molding system. The main equipments of injection molding system which is available at Unit Pengolahan Limbah Plastik Dinas Kebersihan dan Permanan Kota Banda Aceh are polymer waste cutting, splitting and cleaning devices and injection molding machine. According to observation conducted previously on current injection molding product and mold found that failure of product caused by mis-design of mould. Products defects occurred are sink mark, weld line and air trap. Mold-Flow software was used to modeling and simulating injection mold process. Based on simulation result and discussion found that defected products have been able minimized. By modifying sprue location and redesign mold, products defect minimized and injection pressure still remain to push polymer to mold inlet  at range 0,72-0,48 Mpa
Analisis Penjalaran Retakan pada Pipa Transmisi Gas Jenis SUS 304 Menggunakan Metode Elemen Hingga Asbar R
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

A method developed to predict the failure that occurs at gas transmission pipe caused by loading with peak angle crack opening is described in this paper. There are two aspects become the main consideration; the maximum crack peak angle opening for the given load and space, and the determination of the critical stress intensity factor to search at what degree of loading the crack on the gas transmission pipe experiencing creep or failure. This research uses arc-shaped tension specimen and the analysis is carried out by finite element method using ansys ™ rel 5.4. In order to get the stress intensity factor, the loading is varied from 1 KN to 160 KN. Based on finite element method, the maximum stress intensity factor occurs at the range of loading of 16-160 KN, which is 5.67 x 1016 MPa.m1/2, and the minimum factor occurs at the range of loading of 0.5-1 KN, which is 3.76 MPa.m1/2. The stress intensity factor result is also validated with the analytical result. The maximum crack peak angle opening occurs at the range of loading of 16-160 KN which is 250, the stage that is able to cause pipe failure.
Complex Eigenvalue Analysis of A Motorcycle Disc Brake Squeal Zahrul Fuadi; Muhammad Nizar Machmud
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

This paper discusses the phenomenon of brake squeal of a disc brake system used at motorcycle with a capacity of 125 cc. The occurrence of disc brake squeal is associated with the dynamic instability of the system with the influence coefficient of friction. The dynamic instability of the system is predicted using finite element complex eigenvalue analysis. The analysis predicted three unstable modes in the frequency range below 5 kHz. The unstable modes occurred at the frequency of 1250 Hz, 1920 Hz, and 2306 Hz. The occurrence of unstable mode is indicated by the presence of positive real part of the corresponding complex eigenvalue. Unstable mode is shown by the occurrence of coupled vibration between eigenvectors of disc and brake pads vibrating at similar frequency which consists of diametral mode of disc and bending modes of pads. The analysis also showed that the unstable condition could occur at a value of coefficient of friction as low as 0.2.
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.
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.
Evaluasi Pembangkit Listrik Tenaga Angin Kecepatan Rendah Sebagai Penggerak Refrigerator Es 300 Kg/Hari Untuk Nelayan Adi Saputra Ismy; Ahmad Syuhada; - Hamdani
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

Generally, the fishermen in the fishing village of Lancang only 20 trips/month of the year. The average total amount of ice required for the first type of fishing boat is 300 kg ice/day and 150 kg of ice/day for both types of fishing vessels. So, based on the total number of observations of ice demand data is 9000 kg/month (300 kg ice/day). One solution that can be taken is the utilization of wind energy resources owned by the village to generate electrical energy as the driving engine refrigerator. Methods of research conducted in three phases, the first stage is filled with wind potential measurement, processing and analysis of wind speed data. In the second stage of the development of modeling performed to evaluate the performance of Genesis turbines based on the data load and wind potential. The third stage is filled with measurements of 10 KW wind turbine performance and then made ​​comparisons with modeling results. From the analysis of wind speed data obtained from the measurement results obtained by the average wind speed reaches the village of Lancang 3-5 m/s at a height of 15 m above sea level. Based on analytical results obtained using the software Homer wind turbine energy production is 7.474 kWh/year and the results of measurements of overall performance of the turbine can be concluded that wind turbines are the object of study is only able to deliver an average power 3-7 KW.

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