cover
Contact Name
Nasrul Ilminnafik
Contact Email
jurnal.rotor@unej.ac.id
Phone
+628123290147
Journal Mail Official
jurnal.rotor@unej.ac.id
Editorial Address
Jl Kalimantan 37
Location
Kab. jember,
Jawa timur
INDONESIA
ROTOR: JURNAL ILMIAH TEKNIK MESIN
Published by Universitas Jember
ISSN : 1979018x     EISSN : 24600385     DOI : -
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.
Articles 308 Documents
SIFAT MEKANIK DAN CACAT PENYUSUTAN (SHRINKAGE) AKIBAT VARIASI KOMPOSISI CAMPURAN DAUR ULANG POLYETHYLENE PADA INJECTION MOULDING Dwilaksana, Dedi; Darsin, Mahros; Badri, Muhammad Ghilman
ROTOR Vol 7, No 1 (2014)
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Abstract

Injection moulding is one process to form plastic by compress the melted plastic in a closed die. The raw material for the process either pure plastic pellet or mixed with recycled plastics. this research focused on finding the acceptable percentage of recycled  the raw material in term of tensile strengh and shrinkage. The composition is varied from 0% to 100% of polyethylene. Tensile test shows that the more percentage of recycled the lower is the  tensile strenght. on the other hand, the more the recycled composition the highernis shrinkage number. Both decrease of tensile strengh and increase of shrinkage are linearly. Recycled plastic in the raw material makes the composition be not uniform. It leads misrun defect, i.e. the melted plastic solidified before it reach the destined cavity in the mold. Moreover, it also creates more void in the parts. The highest tensile strength of 19.10 N/mm2 when no recycled mixed in, whereas the minimum of 12.05 N/mm2 achieved when 100% recycled was applied. Recycled Composition of 100% also increased by 9,82% compare to pure plastic. Keywords: Recycled plastic, tensile strength, shrinkage.
RANCANG BANGUN SISTEM PENGAMAN PADA SEPEDA MOTOR DENGAN MEMANFAATKAN SENSOR ENCODER DAN SENSOR PING Artika, Kurnia Dwi
ROTOR Vol 6, No 1 (2013)
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Abstract

The natural wealth of South Kalimantan is no doubt. abundant from across the border, so many stood mining companies, and housing estates. this resulted in local residents income increases. Welfare is increased compared to regions or islands. With geographical location filled with hills, forests, plantations and swamps, became an important means of transportation in the mobilization of the results of mining, plantation and trading activities. Therefore, it takes a vehicle in the path of effective special / alternative narrow, winding, uphill and downhill to the extreme. The access road is worth it difficult to pass by the four wheels though. So one solution is a two-wheeled vehicle, the motorcycle. but the problem is security vehicles lately theft rife in both daytime or at night, in the house or outside the house, still theft can be done.Existing security system is not adequate to cope with theft / vehicle crime lately. so that the necessary breakthrough in addressing this problem by installing two sensors at the same time the ping ultrasonic sensor and encoder sensor. with the provisions of the ideal distance and height is obtained from ping ultrasonic sensor 0.4 meters and encoder sensor 4.92 meters. Keywords: ping ultrasonic sensor, encoder, mikrokontroller, lcd
ANALISIS PENGARUH VARIASI MASSA LPG SEBAGAI REFRIGERAN TERHADAP PRESTASI KERJA DARI LEMARI ES Listyadi, Digdo; Ilminnafik, Nasrul; Perkasa, Alfons Erick
ROTOR Vol 6, No 1 (2013)
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Abstract

Refrigerant is a fluid acting on a cooling machine that plays an important role in a carnot cycle cooling engine. In study was done by looking at the effect of adding refrigerant mass variation of the COP (Coefficient of Performance) by using a refrigerant-based non-Freon refrigerant that use LPG (Petrileum Liquefied Gas). In this study using the LPG mass variations 50 grams, 80 grams and 90 grams and use R-12 refrigerant. From the research conducted, the results obtained from the performance engine cooling using refrigerant 80 grams times higher than that using the mass 50 grams and 90 grams, the highest coefficient of performance that is equal to 6,30 The result of research conducted, the result that the COP of the vapor compression machine (fridge) with a variation of the mass is the mass composition 80 grams is best used to obtain the greatest COP. Keyword : carnot’s siklus, COP (Coefficient of Performance), LPG(Liquefied Petrileum Gas)
Analisa Pengaruh Konfigurasi Pipa Pemanas Air Surya Terhadap Efisiensi Darwin, Darwin
ROTOR Vol 6, No 1 (2013)
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Abstract

In order to reduce or replace the use of wood fuel, oil and natural gas to heat water, has a lot of research being done to find alternative energy sources. Solar energy is one alternative energy that can be used to heat water. Solar collector is a device that serves to collect the incoming solar energy and convert it into heat energy which in turn forwarded to the working fluid. The purpose of this study solar water heater is to compare the influence of the configuration of pipes and pipe parallel series with the addition of the collector absorber plate honeycomb shaped the performance of solar energy water heater so that in can be efficiency. From research result obtained temperature irrigate in parallel pipe collector tank at angle 5o equal to 52 oC and also reached efficiency that is 46,16 %, at angle 10o equal to 54 °C reached efficiency 48,15 %, at angle 15o equal to 51 oC reached efficiency 45,10 % and at angle 20o equal to 48 °C and also reached efficiency that is 39,60 % while the water temperature inside the tank to the collector pipe series at angle 5 o equal to 48 oC reached efficiency is 41.67 %, the angle at 10 o equal to 49 oC reached efficiency is 42.86 %, angle 15 º equal to 47 °C reached efficiency is 40.43 % and at an angle 20o equal to 46 °C and also reached efficiency that is 39,14 %. In general, the obtained results indicate that the solar collector with parallel pipe configuration has better efficiency compared to solar collector with series pipe configuration. Keywords: Solar Energy, Solar Collectors, Series Pipe, Parallel Pipe, Efficiency
ANALISIS PENGARUH VARIASI GRADE BIOETANOL TERHADAP DISTRIBUSI TEMPERATUR NYALA API DAN UNJUK KERJA PADA KOMPOR BIOETANOL TANPA SUMBU TIPE TOP BURNER Sutjahjono, Hary; Sanata, Andi; Pratama, Adhitia Yanuar
ROTOR Vol 6, No 1 (2013)
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Abstract

Top burner cotton less bioethanol stove is one of the appliances that apply the use of renewable fuels for domestic capacity. Application of this stove burner is a solution for scarcity of fossil fuel supplies. This study focused on variations in the distribution of flame temperature and performance on the top burner as grade of bioethanol varies at value of 55%, 70%, 85%, and 97%. Flame temperature distribution measured at of their hot spots and then simulated using Matlab R2011a to obtain isothermal contour flame shape and determine the flame temperature distribution of the flame. Performance testing used Standard International Water Boiling Test version 4.1.2 to determine the power, thermal efficiency, specific fuel consumption, and heat transfer. Results obtained that the flame temperature distribution, in the form of profiles and contours isothermal flame, reached its optimum when using bioethanol grade of 97%. Optimal performance on a stove burner using bioethanol 97% with power stove equal to 1.85 kW, the thermal efficiency of 72.21%, specific fuel consumption (Sfc) 0.512 kgbb/kguap, and heat transfer at value of 2,959 kW was also achieved at the same grade. The higher grade bioethanol used to increase the flame temperature distribution and performance of the stove. Keywords: Bioethanol, Stove, Temperature Distribution, Performance
PEMANFAAT FREKUENSI BUNYI MATERIAL SEBAGAI DASAR PENGUJIAN MODULUS ELASTISITAS PADA PENGUJIAN TANPA MERUSAK (NON DESTRUCTIVE TEST) Choiron, Moch. Agus; Djaelani, Abdul Hadi; Hentihu, M. Fahrur Rozy
ROTOR Vol 6, No 1 (2013)
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Abstract

Elastic modulus of material are usually obtained from tensile test. Tensile test categorized as destructive test. One of destructive test weakness is the testing specimen can not be reused. So we need alternative on elastic modulus test without damaging the specimen (non destructive test). This research aims to determine whether the sound frequency of material can be used as a basic for elastic modulus test as a non destructive test. On this research, two different test performed on the same specimen. First test is testing elastic modulus using sound frequency test (non destructive test) and second test is testing elastic modulus using tensile test (destructive test). Percentage error obtained from comparing percent error between those two tests. The results showed, in testing the elastic modulus of brass specimen has an error percentage of 10.33%, in testing the elastic modulus of aluminium specimen has an error percentage of 4.39%, and in testing the elastic modulus of steel specimen has an error percentage of 1.89%. Keywords: Elastic modulus, Non destructive test, Sound frequency
PENGARUH VARIASI BEBAN PENDINGIN TERHADAP PRESTASI KERJA MESIN PENDINGIN DENGAN REFRIGERAN R12 DAN LPG Listyadi, Digdo; Ilminnafik, Nasrul; Rizal A. Y., Moch.
ROTOR Vol 6, No 1 (2013)
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Abstract

In this research discusses the influence of the cooling load variations on job performance refrigeration includes refrigeration capacity, coefficient of performance and cooling time, the compressor, the impact of refrigeration and compression work with refrigerants R12 and LPG. This study uses a variation of the load is light 20watt, 40Watt, 60Watt, and 80watt at the time of the study for 30 minutes for each of the cooling load, the file retrieval is done use the cooling machine refrigerator sanyo type with dimensions of 90 cm x 45 cm x 45 cm. The results showed the optimum value of COP (coeficient of Performance) of the fridge that I use on the refrigerant R12 and LPG with a load of 40 watts and 30 minutes was 4.75 for R12 and 5.00 for LPG,Obtained that use LPG refrigerant temperature produced less than R12 at the same time that is 30 minutes, the temperature on LPG without cooling load is 10 oC, the load is 11 oC 20 watt, 40 watt load by 12 oC, 60 watt load of 15 oC, and for a load of 80 watts by 17 oC and R12 produced no load temperature is 12 oC, 20 watt load as big as 13 oC, 40 oC as a 15 watt, 60 watt load of 16 oC, and for a load of 80 watts of 18  oC it is seen that the use of LPG refrigerants better because it has a pretty good engine performance compared to R12 views of COP obtained from the same load. Key word: Cooling load ,COP, LPG, refrigerant
PENGARUH MICROEXPLOSION TERHADAP KARAKTERISTIK PEMBAKARAN BAHAN BAKAR MINYAK JARAK PAGAR (JATHROPA CURCAS L.) PADA BERBAGAI DIAMETER DROPLET Rosyadi, Ahmad Adib
ROTOR Vol 6, No 1 (2013)
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Abstract

Insights to develop alternative energy sources comes as the depletion of fossil fuel reserves . One is the use of Jatropha or Jatropha curcas Linnaeus . Plants that can be grown on degraded land and does not require much water and fertilizer proved to be extremely effective if the fruit or seeds developed into biodiesel as an alternative energy to replace diesel oil, fuel oil , even kerosene. Jatropha oil has properties that approach the characteristics of liquid fuel especially diesel oil . This prompted the researchers conducted a study of castor oil to find alternative fuels as a substitute for petroleum. In this study the method used is a true experimental research , by comparing one or more test groups with treatment and without treatment . This study uses a variation of the independent variable droplet diameter to the size of 1.75 mm, 1.88 mm , and 1.98 mm . Dependent variable is the temperature of combustion , burning time , the sound frequency fluctuations and flame visualization The results showed that the larger the droplet diameter greater likelihood microexplosion . From observation of the flame burning with microexplosion found that the larger the droplet diameter , the height and width of the flame will tend to increase. Microexplosion make a bigger flame. Burning castor oil to produce ignition delay time microexplosion sooner. Microexplosion castor oil combustion also generates burning with a good rate . It is approaching the character of diesel oil , the ignition delay time is fast but the diesel combustion temperature is lower than pure castor oil. Keywords : microexplosion, burning rate, castor oil
PENGARUH KECEPATAN RELATIF PERMUKAAN GESEK DAN TEMPERATUR TERHADAP KOEFISIEN GESEK BLOK REM KOMPOSIT KERETA API Triono, Agus
ROTOR Vol 6, No 1 (2013)
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Abstract

Braking system is an important thing on safety of the train. In that process, kynetic energy  changed into thermal energy that would be known by the increasing of temperature at the surface and around the area of contact between the wheels and brakes. From research before, the increasing of contact temperature would lead a thermal crack on the wheel. Failure could be occure by that crack. Based on that results, research on the phenomenon of rising temperatures due to friction between wheel and railwould be very needed. In this paper,the effect of temperature and relative velocity of the surface to coefficient of friction would be studied. Experimental study of this paper using pin on disc test with 2 kg load and relative velocity variated from 4,61 m/s(400 rpm); 5,76 m/s(500 rpm) and 6,91 m/s(600 rpm).Results of this research shows that increasing temperature and relative velocity would lead an increasing of friction coefficient. Key word: brake, composite, temperature, friction coefficient, relative velocity
Analisis Kekuatan Tarik dan Kekasaran Kawat Tembaga Hasil Drawing akibat Variasi Persentase Reduksi Arbiantara, Hari; Darsin, Mahros; Firman, Mohammad
ROTOR Vol 6, No 1 (2013)
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Abstract

Wire drawing is cold working process to reduce the cross-sectional area. The value of reduction is different in every process, depend on the needs and working parameters. The degree of reduction causes differences of copper wire rod in the characteristics and quality, such as its tensile strength and roughness. The purpose of this research is to determine the influence degree of reduction to the tensile strength and roughness of copper wire. The research method is comparing the tensile strength and roughness of copper wires control with drawed copper wires, without repetition stage. The speciments used in this research are pure copper rods (99.9%) with 3.1 mm, 3.2 mm and 3.25 mm in diameter and 2.8 mm of die output, so will get the degree of reductions are 19%, 23% and 26%. The results of this research was the wire drawing process increase the tensile strength of copper rods from 86.87 MPa to 100.74 MPa on 19% reduction. On 23% reduction the tensile strength increase from 82.24 MPa to 105.62 MPa. The greatest increase of tensile strength was result by 26% reduction, it was from 86.87 MPa to 115.36 MPa With the more of degree of reduction on the drawing process led the increase of tensile strength will be greater. This research also obtained the result that the wire drawing process result the decrease roughness of copper rods from 0,144 μm to 0,089 μm on 19% reduction, from 0.146 μm to 0.087 μm on 23% reduction and the copper rod roughness decrease from 0.159 μm to 0.083 μm on 26% reduction. The increase of degree of reduction produce insignificantly result of surface roughness changing. Keywords: Roughness, Tensile Strength, Wire Drawing, Reduction, Copper

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