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All Journal Jurnal Teknik Mesin Jurnal Energi Dan Manufaktur Atom Indonesia Journal Proceeding of the Electrical Engineering Computer Science and Informatics Indonesian Journal of Electrical Engineering and Computer Science
R. Soekrisno
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Gadjah Mada, Yogyakarta
Aerospace Engineering Automotive Engineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Karakterisasi Ball Mill Import pada Industri Semen di Indonesia Ratna Kartikasari; R. Soekrisno; M. Noer Ilman
Jurnal Teknik Mesin (Sinta 3) Vol. 9 No. 1 (2007): APRIL 2007
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

The purpose of this research is to investigate the characteristics of import Ball Mill which is used at cement mills in Indonesia. There were two kind of import Ball Mill from PT. Semen Gresik, Tbk that used in this research which are A type (Ø 30 mm) and B type (Ø 40 mm). Visual investigation, chemistry composition, distribution of hardness, and microstructure photograph was conducted characterize these ball mill. Visually, the import Ball Mill has rough surface, white coloring when cut off, and small cracks at all specimens. Type A ball mill contains of 2,934% C, 11,231% Cr, and 0,177% Mo, where type B Ball Mill contains of 2,693% C, 12,31% Cr, and 1,103% Mo. Both are martensitic white cast iron ASTM A532 Class II type A. The surface are harder then the its core. The highest hardness on the surface are 720,82 kg/mm2 (type A) and 746,5 kg/mm2 (type B), where as lowest hardness on the core are 631,1 kg/mm2 (type A) and 544,0 kg/mm2 (type B). Microstructure investigation shows Perlit, Cementit, and Martensit. Abstract in Bahasa Indonesia : Penelitian ini bertujuan untuk mengetahui karakteristik Ball Mill import yang digunakan oleh pabrik semen di Indonesia. Bahan yang digunakan adalah ball mill import di PT. Semen Gresik, Tbk dari 2 merk berbeda, yaitu merk A (f 30 mm) dan merk B (f 40 mm). Karakterisasi Ball Mill import dilakukan dengan pengamatan visual, uji komposisi kimia, uji distribusi kekerasan dan foto struktur mikro. Secara visual terlihat bahwa Ball Mill import memiliki permukaan kasar, hasil potongan berwarna keputihan dan terdapat retakan-retakan kecil pada semua specimen. Hasil uji komposisi kimia menunjukkan bahwa Ball Mill import f 30 mm mengandung 2,934% C, 11,231% Cr, dan 0,117% Mo sedangkan f 40 mm mengandung 2,693% C, 12,313% Cr dan 1,103 Mo, termasuk dalam kelompok Martensitic white cast iron ASTM A532 Class II Type A. Hasil uji distribusi kekerasan menunjukkan bagian permukaan lebih keras dibandingkan bagian pusat dengan nilai kekerasan tertinggi 720,82 kg/mm2 (f 30 mm) dan 746,5 kg/mm2 (f 40 mm) sedangkan nilai kekerasan terendah 631,1 kg/mm2 (f 30 mm) dan 544,0 kg/mm2 (f 40 mm). Hasil pengamatan foto struktur mikro menunjukkan bahwa struktur terdiri dari Perlit, Cementit dan Martensit. Kata kunci: ASTM A532, bola penggiling, besi tuang putih martensitik.
Modifikasi Sifat Mekanik dan Ketahanan Korosi Paduan Fe-1,52Al-1,44C dengan Proses Tempiring Ratna Kartikasari; Sutrisna Sutrisna; Suyitno Suyitno; Soekrisno Soekrisno
Jurnal Teknik Mesin (Sinta 3) Vol. 10 No. 2 (2008): OCTOBER 2008
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Aluminum is third of biggest element in the world and cheaper relatively. The Fe-Cr-C alloy is promised alloy to replace the Fe-Cr-C alloy. The purpose of the research is to investigate influence of temperature to microstructure, tensile strength, hardness, and corrosion resistance of Fe-Al-C in the 3.5% NaCl solution. Raw material for casting is low Mn steel, FeMn HC, pure aluminum, slag remover. The melting used low frequency induction furnace which has 50 kg capacity. Hardening at 900oC, and then quenching in the water, the last temper along 1 hour with various temperature; 250oC, 300oC, 350oC, 400oC, 450oC and cooling in the air. Chemical composition, microstructure, tensile strength, hardness, and corrosion resistance of Fe-Al-C in the 3.5% NaCl solution were investigated. The result of the chemical composition investigation showed that Fe-Al-C alloy contained 1.52% Al, and 1.44% C. The microstructure of Fe-1.52 Al-1,44C alloy is ferrite and pearlite. The tensile strength of Fe-1.52 Al-1,44C alloy is 33.77 kg/mm2. The tensile strength raised after hardening process became 74.44 kg/mm2 and turn off again after tempering process. The Vickers hardness investigation showed that the Fe-1.52 Al-1,44C alloy has 232.4 VHN and raised after hardening became 298.7 VHN. Highest corrosion rate is 0,927 mm/year after hardening and lowest is 0.196 mm/year after tempering at 300oC (good category corrosion resistance). Abstract in Bahasa Indonesia: Aluminium merupakan unsur terbanyak ketiga di bumi yang harganya relatif murah. Paduan yang sangat menjanjikan untuk menggantikan Fe-Cr-C adalah Fe-Al-C. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur temper terhadap struktur mikro, kekuatan tarik, kekerasan, dan ketahanan korosi paduan Fe-1,52Al-1,44C dalam larutan 3,5% NaCl. Bahan baku peleburan yang digunakan adalah: Baja low Mn, FeMn HC, aluminium murni dan slag remover. Peleburan menggunakan dapur induksi frekwensi rendah kapasitas 50 kg. Hardening pada temperature 900oC, quenching dalam air, dan temper dengan variasi temperatur 250oC, 300oC, 350oC , 400oC, 450oC, selama 1 jam kemudian didinginkan di udara. Pengujian yang dilakukan adalah pengujian komposisi kimia, uji struktur mikro, uji tarik, uji kekerasan, dan pengujian korosi dalam media 3,5% NaCl. Hasil pengujian komposisi kimia menunjukkan bahwa paduan Fe-Al-C mengandung unsur Al sebesar 1,52% dan C sebesar 1,44%. Struktur mikro yang terbentuk dalam system paduan adalah ferit dan perlit dengan kekuatan tarik sebesar 33,77 kg/mm2. Terjadi peningkatan kekuatan tarik setelah proses hardening yaitu menjadi 74,44 kg/mm2 dan menurun kembali setelah proses temper, dengan kecenderungan semakin rendah dengan semakin tinggi temperatur temper. Nilai kekerasan sebesar 232,4 VHN, dan mengalami peningkatan pada proses hardening yaitu menjadi 298,7 VHN. Laju korosi paling tinggi terjadi setelah hardening yaitu 0,927 mm/th, dan laju korosi terendah terjadi setelah proses temper 300oC sebesar 0,196 mm/th, termasuk katagori baik. Kata kunci: Ferittic stainless steel, paduan Fe-1,52 Al-1,44C, hardening, quenching, temper.
Efek Dendrite Arm Spacing terhadap Sifat Mekanis Paduan Perunggu Cu-20%Sn I Ketut Gede Sugita; R. Soekrisno; I Made Miasa; Suyitno -
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The purpose of this work is to investigate the effect of dendrite arm spacing on mechanical properties bronze20%Sn alloys The commercial pure copper and tin were melted in crucible furnace at temperature 1000oC. The molten metalwas casted in permanent moulds which have variation temperature, i.e. 35oC, 200oC, 400oC. The history of coolingtemperature on castings was recorded using a computer aided data acquisition Lab view 8.2 system.The microstructure and mechanical properties of this alloy have been investigated. The results of this researchindicate that decreasing the mould temperature affected on increasing solidification rate that caused to reduce thesolidification time. On the other hand, the difference of solidification rate have effected on microstructure forms. Thedendrite arm spacing (DAS) decreases with increasing solidification rate. DAS affected on mechanical properties i.e.ultimate tensile strength and hardness as cast. The mechanical properties increase with decreasing DAS.
Pengaruh Perubahan Bentuk Bead Panel Kendaraan terhadap Frekuensi Alamiah pada Kondisi Batas Bebas-Bebas Sukanto Sukanto; I Made Miasa; R. Soekrisno
Jurnal Energi Dan Manufaktur Vol 7 No 2 (2014): Oktober 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Setiap kendaraan perlu dinding, baik atap maupun lantai. Dinding yang polos biasanyamudah bergetar. Untuk mengurangi getaran perlu dibuat kaku dengan cara penambahanbeberapa bentuk alur atau bentuk bead. Tujuan penelitian ini adalah untuk mengetahuipengaruh stiffness panel terhadap peningkatan frekuensi alamiah pada panel kendaraan.Penelitian ini menggunakan pendekatan ekperimental dengan prinsip meningkatkankekakuan panel melalui rekayasa pembentukan logam secara mekanis. Material pelat bajaASTM A 29 didisain secara manual sehingga memiliki bentuk pola bead tertentu. Panelberpola bead tersebut didisain dengan memiliki total volume yang sama, dengan tebal pelatyang digunakan adalah 1,2 mm dan ukuran spesimen adalah 530 mm x 530 mm.Selanjutnya spesimen panel diukur pada kondisi bebas-bebas. Spesimen diberikan eksitasisehingga nilai frekuensi alamiahnya terekam pada piranti instrument pengukur getaran yangdilengkapi program berbasis LabView. Hasil penelitian ini adalah dengan pembuatan polabead pada panel kendaraan, frekuensi alamiah panel dapat meningkat mulai dari 2 kalisampai dengan 4 kali, dibandingkan dengan panel datar tanpa bead. Peningkatan rasiofrekuensi alamiah tiga panel yang paling tinggi dicapai pada panel berbentuk thirteen-plusbead, panel berbentuk thirteen-square bead dan panel berbentuk nine-plus bead, yaituberturut-turut 636,6 Hz, 258,62 Hz dan 248,79 Hz dari 156,6 Hz panel tanpa bead.Kata kunci: Getaran, panel bead, frekuensi alamiah, dan kekakuan.Each vehicle needs wall, both the roof and the floor. The plain wall is usually easy to vibrateso to reduce vibrations need to be made rigid by the addition of some form of groove or beadform. The purpose of this study was to determine the effect of the increase in panel stiffnessat the natural frequency of the vehicle panel. This study uses an experimental approach tothe principle of increasing the rigidity of the panel through mechanical engineering metalforming. Steel plate ASTM A 29 designed manually so that it has a certain shape beadpatterns. The bead-patterned panels designed to have the same total volume, with platethickness used is 1.2 mm and the size of the specimen is 530 mm x 530 mm. Furthermore,the panel specimens measured at the free condition. Specimens are given excitation so thatthe value of the natural frequency of the measuring instrument recorded on devicesincorporating vibration Lab View based program. Results of this study was to manufacturebead pattern on the vehicle panel, the natural frequency of the panel can be increased from2 times to 4 times, compared with a flat panel without bead. Increased natural frequencyratio of the three panels are the highest achieved in thirteen-plus bead panel, thirteen-squarebead panel and nine-plus bead panel, respectively 636.6 Hz, 258.62 Hz and 248.79 Hz from156.6 Hz without bead panel..Keywords: Vibration, panel bead, natural frequency and stiffness
Assessment of Nugget Size of Spot Weld using Neutron Radiography Triyono Triyono; Jamasri Jamasri; M.N. Ilman; R. Soekrisno; Sutiarso Sutiarso
Atom Indonesia Vol 37, No 2 (2011): August 2011
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2011.65

Abstract

Resistance spot welding (RSW) has been widely used for many years in the fabrication of car body structures, mainly due to the cost and time considerations. The weld quality as well as the nugget size is an issue in various manufacturing and processes due to the strong link between the weld quality and safety. It has led to the development of various destructive and non-destructive tests for spot welding such as peel testing, ultrasonic inspections, digital shearography, and infrared thermography. However, such methods cannot show spot weld nugget visually and the results are very operator’s skill dependent. The present work proposes a method to visualize the nugget size of spot welds using neutron radiography. Water, oil and various concentrations of gadolinium oxide-alcohol mixture were evaluated as a contrast media to obtain the best quality of radiography. Results show that mixture of 5 g gadolinium oxide (Gd2O3) in 25 ml alcohol produces the best contrast. It provides the possibility to visualize the shape and size of the nugget spot weld. Furthermore, it can discriminate between nugget and corona bond. The result of neutron radiography evaluation shows reasonable agreement with that of destructive test. Received: 13 October 2010; Revised: 25 August 2011; Accepted 26 August 2011
Detection and Identification of Detonation Sounds in an Internal Combustion Engine using Wavelet and Regression Analysis Agus Sujono; R. Soekrisno; Eka Firmansyah; Oyas Wahyunggoro
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1248.973 KB) | DOI: 10.11591/eecsi.v1.392

Abstract

Improving efficiency and power in an internal combustion engine is always impeded by detonation (knock) problems. This detonation problem has not been explained fully yet. Quick and accurate detection of detonation is also in the development stage. This research used a new method of detonation sound detection which uses microphone sensors, analysis of discrete wavelet transform (DWT), and analysis of the regression function envelope to identify the occurrence of detonation. The engine sound was captured by the microphone; it was recorded on a computer; it was proceeded using a DWT decomposition filtering technique; it was then subjected to normalization and regression function envelope to get the shape of the wave pattern for the vibration. Vibrational wave patterns were then compared to a reference using the Euclidean distance calculation method, in order to identify and provide an assessment decision as to whether or not detonation had occurred. The new method was applied using Matlab and it has yielded results which are quite effective for the detection and identification of detonation and it is also capable of producing an assessment decision about the occurrance of detonation.
Power Optimization of Spark Ignition Engine by Fuzzy Logic Ignition Controller Based on Knock Detection Agus Sujono; Raden Soekrisno; Eka Firmansyah; Oyas Wahyunggoro
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 2: May 2015
Publisher : Institute of Advanced Engineering and Science

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Abstract

Spark ignition engines have many advantages, but to increase the power and efficiency, they have a problem to set the right ignition timing, at which the maximum power can be delivered. In reality, the optimum ignition time is immediately prior to, or close to, the moment of detonation (knock). On the other hand, the value of this optimum ignition timing is dependent primarily on the rotation of the crank shaft and the level of throttle openings. To provide the right  timing proficiency level, it is very difficult to overcome the mechanical control system as found in conventional engines. So, in this study, a new electro-mechanical method based on Fuzzy Logic Ignition Controller (FLIC) which follows the pattern of the timing in the detonation chart was created. The results of the FLIC study, in fact, are able to provide correction for each spark plug ignition, according to the data on the chart of the optimal ignition timings for all combinations of engine rotations and throttle openings. From the final data recorded, it can be said that the FLIC influence on the power output which increases of up to 15% above normal. DOI: http://dx.doi.org/10.11591/telkomnika.v14i2.7597
Co-Authors Agus Sujono Agus Sujono Eka Firmansyah Eka Firmansyah I Ketut Adi Sugita I Made Miasa Jamasri . M. Noer Ilman M.N. Ilman Oyas Wahyunggoro Ratna Kartikasari Solly Aryza Sutiarso Sutiarso Sutrisna Sutrisna Suyitno - Suyitno Suyitno Triyono Triyono