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ROTOR: JURNAL ILMIAH TEKNIK MESIN
Published by Universitas Jember
ISSN : 1979018x     EISSN : 24600385     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
ROTOR merupakan jurnal yang diterbitkan oleh Jurusan Teknik Mesin Universitas Jember yang memuat artikel ilmiah dalam bidang Konversi Energi, Design/Perancangan, Teknik Produksi, Material serta bidang lain yang terkait dengan Teknik Mesin. Semua naskah yang diterima ROTOR diterbitkan secara global dalam bentuk elektronik. Hasil penelitian yang diterbitkan dalam jurnal ini diharapkan dapat menambah khasanah pengetahuan di bidang Teknik Mesin serta menjadikan sarana bagi para profesional baik dari dunia usaha, pendidikan, ataupun peneliti untuk menyebarluaskan perkembangan ilmu pengetahuan dan teknologi di bidang Teknik Mesin melalui publikasi hasil penelitian.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 333 Documents
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PENGARUH PUTARAN SPINDEL, GERAK MAKAN DAN KEDALAMAN POTONG TERHADAP GETARAN SPINDLE HEAD HASIL PROSES DRILLING Hermawan, Yuni
ROTOR Vol 5, No 1 (2012)
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Abstract

The process  of  drilling  or  often  referred  to  as  the  drill  is  the  simplest machining  process  among  other  machining  processes.  Usually  in  the  garage  or workshop process is called the drill, although this term is actually less accurate. The process of the drill is intended as a process of making a round hole by using a drill (twist drill). While the process of drilling is the process to expand / enlarge the hole that can be done with a drill rod is not only done on the drill machine, but it could also machine tool, machine freis, or drilling machines. From the research results can be seen the effect of the parameters used to the chatter values obtained chisel. Can be seen carving the smallest value of the vibration generated from experimental data 1 is =0.6361 m/s2 at n = 136 rpm, f = 0,07 and a = 14 mm. While the biggest chisel vibration acceleration values obtained from experimental data collection to 27 for =,4267 m/s2 at n = 681 rpm, f = 0,22 and a = 20 mm. From the regression equation can be known parameters of the most influential pieces of depth of cut. The results in general that the value of vibration acceleration and determination, after  the meal motion raised the value of vibration acceleration chisel and roundness are also growing, this was due to the greater movement of food is used then the resulting anger is also getting thicker  so that the required cutting force increasing large. Consequently tangential force is also rising and  causing the radial force and moment coupling. Moments and radial forces which cause bending and twisting of the chisel, consequently the greater the roundness deviation. Key words: drilling, feeding, dept of cut, spindle head and vibration.
STUDI EKSPERIMENTAL PERBANDINGAN ALIRAN MELINTASI DUA SILINDER SIRKULAR DAN SILINDER ELIPS TERSUSUN TANDEM DAN INTERAKSINYA TERHADAP DINDING DATAR Helmizar, Helmizar
ROTOR Vol 5, No 1 (2012)
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Abstract

The study was conducted to obtain information about the characteristics of fluid flow that touches the surface of the bluff body.  Bluff body in the form of circular and elliptical cylinders  and brought near a wall. Phenomenon found is used to predict the aerodynamic loads on the bluff body and leads to a drag reduction efforts.Elliptic cylinder and circular cylinder are arranged in tandem position with longitudinal distance (L/D = 1.5) and gap distance variation (G/D) between cylinders and  flat wall are 0.067, 0.133, 0.2, 0.267. Fluid flow characteristics investigated experimentally on open loop wind tunnel. The experimental results are used to explain flow interaction phenomenoum which is resulted coefficient pressure distribution (Cp) on the cylinder, on the flat wall and velocity distribution on the upstream and downstream. The placement of the elliptic cylinder at G/D = 0.267 exhibits the lowest drag. The whole research was done on the Reynolds number 53574 based on circular cylinder diameter. Keywords: circular cylinder, elliptic cylinder, drag force.
PENGARUH KECEPATAN POTONG, GERAK MAKAN DAN KETEBALAN PEMOTONGAN TERHADAP GETARAN BENDA KERJA PADA PROSES SEKRAP Mulyadi, Santoso
ROTOR Vol 5, No 1 (2012)
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Abstract

Shaping  machine  is  a  machine  tool  used  to  modify  the  surface  of  the workpiece into a flat surface, good story, angled, and the flow corresponding to the shape  and  size  desired.  Shaping  process  is  a  process  similar  to  the  lathe,  the difference is in motion the process of intersection. In the process shaping machine tools with straight main motion back and forth vertically or horizontally. Chisel cut motion  in  a  straight  motion  of  the  workpiece  is  translational.  In  this  case  the workpiece and cutting tool is at rest moving straight translation. At the chisel to move back, move the workpiece also bait (feeding). So your back will chisel stuck in a moving workpiece. Shaping machinery industry in the world used to work on areas of flat, convex, concave, disorderly, in a horizontal position, vertical, or oblique, etc. From the research results can be seen the effect of the parameters used to the chatter values obtained chisel and roundness. Can be seen carving the smallest value of the vibration generated from experimental data 1 is =0.5562 m/s2 at n = 5 m/min, f = 0,2 and a = 1 mm. While the biggest chisel vibration acceleration values obtained from experimental data collection to 27 for = 5,1659 m/s2 at n = 11 m/min, f = 0,6 and a = 2 mm. The results in general that the value of vibration acceleration, after the feeding motion raised the value of vibration acceleration of the workpiece increases, this is because the larger the feed motion is used then the resulting anger is also growing thicker so that the necessary cutting force increases. As a result, the tangential force is also up and cause the radial force and moment coupling. Keywords: cutting speed. feeding, dept of cut,  workpiece and vibration.
EVALUASI KOROSI BAJA KARBON RENDAH ASTM A36 PADA LINGKUNGAN ATMOSFERIK DI KABUPATEN JEMBER Sumarji, Sumarji
ROTOR Vol 5, No 1 (2012)
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Abstract

Atmospheric corrosion is corrosion or degradation of materials in the atmosphere that occurs naturally. The corrosion rate varies for different materials and is influenced by several environmental factors, such as: humidity, temperature, and pollutant (NOx, SOx, Cl-, CO2). This research studies the corrosion rate of low carbon steel ASTM A36 in kabupaten Jember environment with different area. The location of research was done in the side of beach (Watu Ulo), the centre of city (Gajah Mada street) and the mountain range (Rembangan). The dimension of test racks and specimens for atmospheric exposure were prepared in accordance with the ASTM G 50 – 76. The cleaning of all corrosion products were done in accordance with the ASTM G 1- 90. The result shows that the highest corrosion rate is in the Watu Ulo as big as 2,82 mpy, than Gajah Mada street as big as 0,919 mpy. The lowest corrosion rate is in Rembangan as big as 0,844 mpy. From the micro photographs, it is found that low carbon steel ASTM A36 corrode by uniform and pitting formation. Keywords: atmospheric corrosion, uniform, pitting
STUDI PERBANDINGAN KETAHANAN KOROSI STAINLESS STEEL TIPE SS 304 DAN SS 201 MENGGUNAKAN METODE U-BEND TEST SECARA SIKLIK DENGAN VARIASI SUHU DAN PH Sumarji, Sumarji
ROTOR Vol 4, No 1 (2011)
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Abstract

There are many failures in a structure that is caused by the damage of the metal that support them. One of the problem which can cause the damage of the metal is corrosion. With its action, corrosion can make a metal  become thin, and in some cases can make a crack and fracture. Some factors are determine how fast the process is occured in corrosion process, for examples are the oxygen concentration, degree of acidity, and temperature. The purpose of this research is to know how is the role of that factors in corrrosion process. This research is implemented in three condision of temperatures (300 C, 500 C, 700 C), variation of HCl’s pH (0, 1, 2), and cycle environments condition. That will be combined and will be tested for about 7 days. After this execution, material will be measured for the decrease of the weight to give the value of corrosion rate. From this experiment, the rate of corrosion rises by increasing temperature and the decreasing pH condition. In all condition of this experiment, the SS 304 Stainless Steel has the better resistant to the corrosion in HCl environment.  The highest corrosion rate of cycle condition is 36.119,4 mpy for SS 201 Stainless Steel, and 515,5 mpy for SS 304 Stainless Steel. Form the micro photographs of corrosion happened on SS 201 Stainless Steel is pitting corrosion and SS 304 Stainless Steel is uniform corrosion. Keywords: Stainless Steel, Cycle and Corrosion
PENGARUH PEMASANGAN SIRIP PENGARAH PADA BUFFER TERHADAP UNJUK KERJA MOTOR BENSIN Kustanto, Muh Nurkoyim
ROTOR Vol 4, No 1 (2011)
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Abstract

Perfect combustion can improve engine performance and save fuel consumption. One of the requirements perfect combustion is a homogeneous mixture of fuel and air when entering the combustion chamber. Air and fuel mixture to become homogeneous in case of turbulence in the mixing. Buffer with director fin is used to provide additional mixing time between air and fuel at the same time create a turbulent flow before entering the combustion chamber. In this study the buffer fitted with director fins with different variations. The number of fins variation used in this study are 3, 4, 6, 8 and 10 with a variation of the angle are 45o and 60o. The analysis was conducted on the effective power and torque output and the FC (Fuel Consumption) needed from each variation condition buffer. From the results of testing on the condition of the buffer with 3 fins angled 60o obtain the highest effective power increase 5.92% and increase in the highest torque 2.66% when compared with the buffer without fins. The lowest FC (Fuel Consumption) in the buffer with 3 fin angle 60 ° when compared with the buffer without any fins at 4000 rpm with a 11.15% difference. Keywords: homogeneous, turbulent, buffer and fin
ANALISA PENGARUH KARAKTERISTIK KEKUATAN PERSAINGAN PORTER TERHADAP KINERJA SEKOLAH DENGAN PENDEKATAN BALANCED SCORECARD Sidhartawan, Robertus
ROTOR Vol 4, No 1 (2011)
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Abstract

The Schools have to anticipate the influence of external environments. The external environment analysis consist of the macro and micro analysis. The micro analysis used Porter`s five force model of competitiveness consist of threat of new entrans, the bargaining power of supplier, the bargaining power of customer, threat of substitutes schools  and rivalry among existing schools. The purpose of this study was to examine the Porter`s five force model of competitiveness on organizational performance of  school in balanced scorecard approach. Data for this study were collected from middle schools using a self-administered survey questionnaire. Hypothesis test showed that threat of new entrans, the bargaining power of supplier, the bargaining power of customer, threat of substitutes schools  and rivalry among existing schools examined had a significant impact on school performance in balanced scorecard approach.  but partially only threat of new entrans, the bargaining power of supplier, and rivalry among existing schools are significantly influence on schools performance in balanced scorecard approach. but for  the bargaining power of customers, and the threat of substitutes schools aren’t significantly influence on schools performance in balanced scorecard approach. Keywords: external environment,  micro environment analysis, Porter`s five force model of competitiveness, performance, balanced scorecard
PENGARUH BESAR ALIRAN GAS TERHADAP CACAT POROSITAS DAN STRUKTUR MIKRO HASIL PENGELASAN MIG PADA PADUAN ALUMINIUM 5083 Junus, Salahuddin
ROTOR Vol 4, No 1 (2011)
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Abstract

The amount of gas flow speed is a parameter of classification that can affect the quality of results of the classification and structure of the micro. One of the functional use of protective gas to protect the molten metal (weld pool) of elements in atmosfer. The use of high-speed gas flow is used to examine the influence of gas flow to the disabled porosity that occurred in the classification of MIG on aluminum alloy 5083. There are three variations gas flow speed is used to examine the influence of impaired quality of welded porosity that occurred in the classification of MIG. Test results obtained by the largest defect porosity occur at the speed of gas flow 12 liters/minute with a density of 2.2 g / cm ³ and the porosity as much as 46% with the lowest value of pull strength 51.150 MPa. Grants flow speed gas is an increasingly large number of particles of magnesium silicate (mg2si) and will mg2al3 reliability increased material, the content of zirconium (Zr) and some titanium (Ti) role as the resultant refiner details (grain-refiner), increased levels of refinement details with increasing heat input and speed welding. Keywords: aluminium welding 5083, gas flow, radiography test, penetran test, density, porosity, tensile strenght, micro structure
PENGARUH DIAMETER PIPA SALURAN GAS BUANG TIPE STRAIGHT THROW MUFFLER TERHADAP UNJUK KERJA MOTOR BENSIN EMPAT LANGKAH Sanata, Andi
ROTOR Vol 4, No 1 (2011)
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Abstract

Exhaust muffler system is commonly called is one vital part of a motor vehicle. This serves as an exhaust silencer is removed from the machine until at a certain noise level permitted with little possibility of a decline in torque and engine power. This study aims to determine the influence of the exhaust pipe diameter of straight throw gasoline engine performance, pressure, exhaust gas flow rate and intensity of noise generated. From the results of research in getting that throw straight exhaust pipe diameter which was able to improve gasoline engine performance, pressure, flow rate of exhaust gas and noise intensity. This is evident from the results of research that shows that there was an increase by using a exhaust pipe diameters greater straight throw. Keywords: exhaust pipe, exhaust silencer and straight throw
PENGEMBANGAN DAN ANALISIS ERGONOMI KURSI OPERATOR MESIN VULKANISIR BAN DENGAN METODE REVERSE ENGINEERING Hermawan, Yuni
ROTOR Vol 4, No 1 (2011)
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Abstract

The likelihood of complaints occurring in the tire retreading machine operator is very possible especially if the seats are not as ergonomic. This situation occurs and will be redesign chair  process machine operators with a method of tire retreading Reverse Engineering (RE) with respect to ergonomic aspects. By analysis using finite element software simulations, we can determine the voltage that occurs in part the concept of tire retreading machine operator seat. So it can be seen clearly the force distribution that occurs in material unit concept tire retreading machine operator seat. To calculate the material strength analysis by finite element software can use the help of CATIA V5R14 software. This is intended to get maximum results and an accurate analysis. After the experiment, the voltage that occurs on a cushion of 1.81x106 N/m2 located on the bottom face of the middle cushion while the minimum working voltage is 1.81x105 N/m2 located on the bottom front cushion edges. The voltage that occurs on a cushion of 1.27x108 N/m2 located at the base of the curved pipe connections while the minimum working voltage is 1.27x107 N/m2 located at the base of a straight pipe connection. Ergonomics analysis obtained by using the method Rula when operators run the machine has the injury risk rate value is 2, which shows the attitude of the body is acceptabel and do not need to be changed for the long term. Keywords: ergonomic, chair operator and reverse engineering

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