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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 319 Documents
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PENGARUH VARIASI JENIS CAIRAN PENUKAR PANAS TERHADAP KINERJA PEMANAS AIR TENAGA SURYA SISTEM PELAT DATAR YANG MENGGUNAKAN PRINSIP SIRKULASI PAKSA Arifin, Zainul; Laksana, Dedi Dwi
ROTOR Vol 6, No 2 (2013)
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Abstract

Solar water heater is a device that heats water using solar collectors as heat sink of radiation heat, which is forwarded to the pipe containing the fluid heat exchanger (heat exchanger). In this study, conducted comparative testing of solar water heating performance between the performance of the water heater that uses liquid water heat exchanger, airgaram 3.5%, and palm oil. Data collection was performed by taking the data every 30 minutes for 3 hours is at 9:00 to 12:00 pm and the test done 3 times on different days with variations in the type of fluid heat exchanger. From the study data taken include temperature liquid heat exchanger in and out the collector, and the water temperature in the tank, which is then carried out data processing to determine the mass flow rate, density of the fluid, temperature differences in the liquid heat exchanger incoming and outgoing collector (AT) , the performance of solar water heaters (q), and processing the data graphically. The results of the research of some kind of liquid water heat exchanger, brine 3.5%, and palm oil showed that liquid palm oil heat exchanger with a heat capacity of 1,866 kJ / kg. K and a boiling point of 175 0C is the greatest performance, the performance of the lowest value owned by the water. This is due to the value of palm oil heat capacity smaller than a heat capacity of water and greater than the capacity of brine 3.5%, but it is also influenced by the boiling point of palm oil is the highest of any other heat exchanger fluid. Key Words: Heat exchanger, heat capacity, performance, collector, boiling point.
Pengaruh Parameter Faktor Stir Casting pada Porositas KOmposit Al-SiC Sadi, Sadi; Malau, Viktor; Wildan, M Waziz; Suyitno, Suyitno
ROTOR Vol 7, No 1 (2014)
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Abstract

This research aims to analyze the effect of stir casting factor parameters on  Al-SiC composite porosity using Taguchi method.   Composite materials used aluminum alloy   Al-Si as matrix and SiC particle (silicon carbide) sized -400 mesh as reinforcement.   Al-SiC composites specimen porosity was tested using  Archimedes  principles.  Experimental  design  using  L16  orthogonal  arrays  Taguchi method standard. Factors used  for  the experiment were SiC content, melt  temperature, rotation speed and stirring  time  duration,  each  using  4  variation.  Experimental  results  showed  that  increasing  SiC content parameters and stirring rotation speed from 100 into 300 rpm can increase Al-SiC composite oporosity,  but  increasing melt  temperature  above  700 C  and  stirring  time  from  10-30 minutes  candecrease the porosity. The most significant factor affecting Al-SiC composite porosity was SiC conten with 84,7 % contribution. Microstructures of Al-SiC casting composites were observed using scanning electron microscopy  (SEM). Keywords: Al-SiC composites, porosity,  stir casting, experimental design, taguchi method
PENGIDENTIFIKASIAN ENTALPI BAHAN BAKAR PADAT (CHAR) DAN CAIR (TAR) HASIL PROSES PIROLISIS BIOMASA Wijayanti, Widya
ROTOR Vol 7, No 1 (2014)
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Abstract

An experimental study of pyrolysis method had been conducted to support alternative fuels demand. It was very attractive method to convert the biomass; mahogany wood to be the alternative fuels. For that reason, an appropriate pyrolyzer will be required to support the process. Due to thermochemical process, an occurred energy transfer all through the process considered not only the heat transfer mechanism but also the chemical reaction mechanism producing heat of reaction in the pyrolysis products (enthalpy). Therefore, the study aims to identify the influence of different temperatures on the measured enthalpy of pyrolysis by means of calorimetrical measurement. The biomass samples used mahogany wood that would be pyrolyzed in the experimental run. Afterward, the influence of temperature toward the solid (char) and liquid (tar) yields were investigated. The enthalpy yields formation would be presented by calorific/heating value of formed char/solid yields indicating important-physical properties of fuel. The results referred that the values of solid yield enthalpy were pointed in the increasing values with the increasing of pyrolysis temperature, however,the enthalpy values of tar inclined to temperature of 500°C. It would decline because the viscosity of tar becomes lighter. Keywords: Enthalpy, Char, Tar, Biomass, Pyrolysis
ANALISA VARIASI JUMLAH LILITAN PADA ALAT PENGHEMAT BAHAN BAKAR TERHADAP EMISI GAS BUANG MOTOR BENSIN 4 LANGKAH PEP, Pratama; Listyadi, Digdo
ROTOR Vol 7, No 1 (2014)
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Abstract

Process combustion of fuel in room burn to be influenced by many factor , among others is temperature, closeness of mixture, composition, and turbulensi exist in mixture. When fuel temperature with air mount, hence will progressively easy  to  fuel with  the air  to on  fire.Gas emission  throw away which  is yielded  from combustion  process  at motor  vehicle  can  have  the  character  of  poison  and make  negative  effect  at environment around, the mentioned in causing by less perfect combustion process, gas result of less the combustion perfect for example is CO, HC.The purpose of this study was to determine the effect of the use of electromagnets  in  the  fuel  line gasolin engine 4 step with variations  in  the number of windings on exhaust emissions and  fuel consumption  . The study was conducted  in Laboratory Convert Energi Majors Technical Engineering Faculty Of Technique University Jember . Equipments which  is used  in  the  testing  is Motor gasoline 4 Step with machine brand Honda Supra x  125D, Gas Analyzer , buret, measure glass,  stop wach, tachometer , and accumulator 12 volt. used by materials is Premium RON 88, strand of metal  have diameter to 0,6 cm, pipe  have diameter to 1" with length 12 cm, and ring 18 cm.This study focuses on the variation of the number of windings on fuel saving devices on exhaust emissions of petrol 4 step. Analysis of the data sought includes AFR, Magnetic Field, Ampere each variation, emissions of CO gas (%), CO2 emissions (%), HC emissions (ppm), O  gas emissions (%). Fuel Consumption (FC). From the research  2conducted,  it can be concluded  that  the  larger  the number of winding electromagnets,  the more binding  the amount of oxygen in the combustion chamber , so it would be more optimal combustion. The lower the value of the FC (Fuel Consumtion), the lower the fuel consumption required for the performance of the engine. Variations in the amount of electromagnetic windings affect fuel consumption  . Fuel consumption is  the most efficient use of  the variation  found  in  the number of windings of  the coil 1000  fuel standard state conditions of 0.57 Kg / hr to 0.43 Kg / h at 3000 RPM rotation with increased efficiency of about 8.14% . Although these results are smaller than the results of previous research by 20.35 % , but at engine speed 9000 RPM FC  results of  this  study  resulted  in a  lower ,  ie 0.81 Kg  / hour compared  to 1.19 Kg  / hour.   Keywords : Magnetic Field, Emission Gas  throw away  , Fuel Consumtion.
SMALL-HOLE DRILLING USING DIE SINKER ELECTRICAL DISCHARGE MACHINE Firmanto, Hudiyo; Winarto, Felixtianus Eko Wismo
ROTOR Vol 7, No 1 (2014)
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Abstract

Banyak kesulitan dihadapi pada pemesinan lubang kecil. Terutama jika prosesnya dilakukan dengan proses drilling mekanik. Untuk mengatasi kendala yang dihadapi, proses pemesinan non-tradisional seringkali diterapkan. Tulisan ini melaporkan hasil studi pemesinan lubang kecil (diameter kurang dari 1 mm) menggunakan EDM die sinker. Lubang dibuat pada aluminium dengan ketebalan 3 mm. Kawat tembaga berdiameter kurang dari 1 mm dipergunakan sebagai elektroda. Untuk menghindari keausan elektroda yang berlebihan, pemesinan dilakukan dengan menggunakan parameter yang menghasilkan energi rendah. Pemilihan parameter ini juga dimaksudkan untuk mendapatkan kualitas lubang yang baik. Pengamatan dilakukan terhadap kualitas lubang yang dihasilkan. Selain itu studi juga dilakukan pada pengaruh parameter pemesinan terhadap keausan elektroda dan waktu pemesinan. Hasil studi menunjukkan bahwa lubang dengan diameter kurang dari 1 mm berhasil dibuat dengan mesin EDM die sinker. Waktu yang diperlukan untuk pemesinan berkisar antara 5 – 6 menit. Lubang yang dihasilkan memiliki kebulatan yang relative baik dan permukaan yang tajam. Peningkatan energi pemesinan menambah keausan elektroda dan memperpanjang waktu pemesinan.   Keywords: EDM, small hole, drilling, electrode wear
PENURUNAN KADAR CO2 PADA BIOGAS DENGAN ABSORBSI NaOH TERHADAP KECEPATAN RAMBAT API GA, As’adi; Ilminnafik, Nasrul; Syuhri, Ahmad
ROTOR Vol 7, No 1 (2014)
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Abstract

Biogas is produced from the fermentation process and generate gases: CH4, CO2, H2, N2, O2, and H2S. The biogas content on there are still many impurities (inhibitors) in affecting the quality of the biogas biogas, one of which is CO2. Carbon dioxide is a molecule that can inhibit and decrease the rate of the combustion reaction, because the carbon dioxide would disrupt the chain of chemical reactions of combustion, so the chemical reaction of combustion is inhibited. This study was to determine the effect of variations in the concentration and duration of contact NaOH to the reduction of CO2 levels shown in the figure the distance between the flame propagation speed of propagation of fire and flame. Observations carried out experiments with burning stoichiometric mixture (methane and air) that has been purified in the combustion chamber Helle-Shaw Cell 1cm x 20cm x 60cm. The results showed that the concentration and contact time can reduce the levels of CO2 in the biogas yield faster flame propagation speed.   Keywords: Cepat Rambat Api, Karbon dioksida, Konsentrasi NaOH, Waktu kontak
EFEKTIVITAS VARIASI CAMPURAN RADIATOR COOLANT DENGAN AIR TERHADAP LAJU PEMBUANGAN PANAS Hadi, Badrul; Muttaqin, Aris Zainul
ROTOR Vol 7, No 1 (2014)
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Abstract

Radiator adalah alat yang berfungsi sebagai alat untuk mendinginkan air yang telah menyerap panas dari mesin dengan cara membuang panas air tesebut melalui sirip-sirip pendinginnya. Penelitian bertujuan untukmengetahui laju pembuangan panas dan efektifitas pada radiator dengan beberapa komposisi campuran air dengan radiator coolant.Dalam penelitian ini, dilakukan pengujian perbandingan laju pembuangan panas antara komposisi campuran 90% air dengan 10% radiator coolant, 70% air dengan 30% radiator coolant, 60% air dengan 40% radiator coolant, dan 50% air dengan 50% radiator coolant. Pengambilan data dilakukan dengan mengambil data setiap 5 menit selama 30 menit. Dari penelitian tersebut diambil data antara lain temperatur masuk dan keluar radiator dan volume aliran fluida (Q) yang kemudian dilakukan pengolahan data untuk menentukan laju aliran massa (), panas spesifik fluida (Cp), laju pembuangan radiator (q), dan pengolahan data secara grafik. Hasil penelitian dari beberapa komposisi campuran air dengan radiator coolant menunjukkan bahwa variasi dengan = 1,02 yaitu pada komposisi campuan 70% air dengan 30% radiator coolant yang memiliki nilai laju pembuangan panas yang paling tinggi, hal ini disebabkan nilai Cp pada komposisi ini lebih besar dibandingkan dengan yang lain. sedangkan untuk nilai efektifitas paling tinggi untuk variasi komposisi campuran dimiliki 50% air dengan 50% radiator coolant, hal ini disebabkan (beda suhu rata-rata) berbeda jauh dibandingkan variasi komposisi campuran yang lain.   Kata kunci: Radiator, air, radiator coolant, heat exchanger
PENGARUH VARIASI WARNA PLAT KOLEKTOR SURYA TERHADAP KINERJA PEMANAS AIR TENAGA SURYA SE, Harizalni; Muttaqin, Aris Zainul; Mulyadi, Santoso
ROTOR Vol 7, No 1 (2014)
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Abstract

Solar water heater  is a device  that heats water using  solar collectors as a heat absorber of  solar  radiation  that is  transmitted  to  the pipe containing water  . In  this research, comparative performance  testing of solar water heating to solar collector plate color variations . Variations of color used is black ( black ) no. ( 39 ) with the brand of quick drying formula zuper spray acrylic spray paint , red ( red signal ) no. ( 23 ) with rj LONDON acrylic paint brand epoxy spray paint  , and blue  ( blue  fluorescent  ) no.  ( 1004) with rj LONDON acrylic paint brand spray paint epoxy Data collection was performed by  taking data every 30 minutes  for 3 hours are 9:00 to 12:00 pm at the clock and the test performed 3 times on different days . Data taken from the study include inlet and outlet water temperature collectors , and the temperature of the water in the tank , which is then carried out data processing  to determine  the  flow rate  ,  the density of water  ,  the water  temperature difference in and out collector  ( ÄT  )  ,  the performance of solar water heaters  ( q  )  , and processing  the data graphically . The results of the study of each color plate solar collector plate showed that the color black has the highest absorption compared with red and blue , because the color black has emissivity close to 1 ( objects that are almost black)  is a  transmitter as well as a good heat absorber. Kata kunci: Kolektor, emisivitas, warna plat, air
PENGARUH BENTUK PENGARAH ANGIN (DEFLECTOR) TERHADAP KARAKTERISTIK AERODINAMIS KENDARAAN NIAGA (TRUCK) Wahyudi, Wahyudi; Rubiono, Gatut; Mujianto, Haris
ROTOR Vol 7, No 1 (2014)
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Abstract

Aerodynamic is a branch of science which study the effect of wind to an object. Transport vehicle (truck) is one of the object in this field. A deflector is use to direct the wind for aerodynamics aspect. The research is conduct in a small scale wind tunnel with 40 cm x 40 cm cross section and 300 cm length. A truck model is varied without deflector, flat deflector, convex deflector and concave delector. The wind speed is varied at 1,9; 2,31 and 3,23 m/s by a fan. U type manometers with 30o inclination are used to measure height difference (Dh) of the water column at 3 pointsabove the deflector. The data are used to count the wind pressure and the wind speed.Aerodynamic performance is described as a capability to maintain the wind speed at measurement points.The research result shows that the deflector has effect due to aerodynamics characteristic of truck model. Convex deflector has the best performance. Flat and concave deflectors are next.   Keywords: aerodynamics, truck, deflector
Analisis Cacat Casting Akibat Variasi Lama Waktu Pengerasan dan Persentase Binder di PT. Barata Indonesia Ramadhanu, Arya; Syuhri, Ahmad; Djumhariyanto, Dwi
ROTOR Vol 7, No 1 (2014)
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Abstract

Sand inclusion and pin hole are surface defects caused by molding sand. Therefore need by varying age sand and percentage of binder in sand molds. The purpose of this research to improve the quality of the product. Each treatment will through tensile strength test, then make a plate pattern for casted . Each plate will checked defects that occur, sand inclusion and pin hole . Data from this research will be analyzed using ANOVA factorial design 2x3. The results of this research with a percentage of 1.5% binder and age sand 24 hour produce sand inclusion of 0% and pin hole, 2 holes. Keywords: Sand inclusion, pin hole, binder, age sand

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