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All Journal Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur Rekayasa Mesin Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Mesin
I Made Parwata
Fakultas Teknik, Universitas Udayana
Education Energy Industrial & Manufacturing Engineering Mechanical Engineering

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PENYELESAIAN PENDEKATAN PROBLEM KONTAK HERTZIAN PADA KASUS KONTAK ANTARA RODA DAN REL Parwata, I. M; Puja, I. W; Budiwantoro, B; Brodjonegoro, S. S
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (707.479 KB)

Abstract

In this paper, an approach of the formulation for Hertzian contact problem between wheel and rail is presented. This formulation used analytic and numerical approach, especially in solving elliptic integrals in order to obtain dimension relations of the contact, deformation, contact pressure and stress contours. The main curvature radius range of the smaller rail are from 300-260 mm. Modeling with finite element solution was also performed as an alternative approach solution to the contact pressure. Besides, it is with Finite Element Method (FEM) can show the contact stress distribution and the influence of contact at a certain depth. The result of this formulation and Finite Element approach are compared with the model equation by Fischer and Wiest [1] and the exact value calculated by Hertzs equation [2]. The results showed that the calculation of the contact dimensions and maximum contact pressure give more conform results. The difference results obtained by the method of Hertz are between 1.47-2.37% for the maximum contact pressure and 2.45-3.02% for the major axis the ellipse. The difference results using finite element method also gives conforming results of 0.09-3.5% for the maximum contact pressure.
Wear of Medium Carbon Steel under Friction Loading with Various Contact Surface Temperature Widiyarta, I Made; Parwata, I Made; Lokantara, I Putu; Dwipayana, Dwipayana
Jurnal Rekayasa Mesin Vol 12, No 1 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.01.17

Abstract

The work presented in this paper is to investigate the wear rate and wear mechanism of medium carbon steel with carbon contents of about 0,5 wt.% under the friction load with various contact surface temperatures. The wear test was performed by using the linear reciprocating ball-on-flat wear test machine. To develop the elevated temperature on the surface of the wear test specimen, the heater assembled into the wear test machine. The surface temperature of the wear specimen was set in the range of 30 ºC up to 250 ºC. The test was taken under 5000 cycles of friction loading with a maximum of the normal load of 25N. The experiment results show that the change in the contact surface temperature in the range of 30 ºC up to 250 ºC causes the wear rate to increase slightly. This is because the elevated temperature at the surface was not high enough to cause the hardness of the material to decrease significantly. The worn surface looks very thin scratches and slightly deformed layers, and the wear mechanism had identified as oxide wear.
KAPASITAS PRODUKSI BUBUR KEDELAI BAHAN BAKU TAHU DENGAN VARIASI DEBIT AIR PROSES PENGGILINGAN I. M. Widiyarta; I. M. Parwata; W. Putra; A. A. G. Wirayoga
Buletin Udayana Mengabdi Vol 15 No 2 (2016): Jurnal Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

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Abstract

Soybean grinding machine has been used by many small industrial for tofu production to increaseproductivity. The addition of the water container with tap water on soybean grinding machine intended tohelp the soybean grinding process becomes faster and constant. How the changing of the flow water is canaffect the speed of production need to research in order to make predictions of tofu production.In this article, the extra water in the process of grinding soy is regulated varies (by opening the tap water of30°, 45°, 60°, 75° and 90° (full aperture)) to determine the speed of the production of soy porridge with tofuraw materials. The result has shown the greater water discharge the faster the soy pulp production process.
APLIKASI INJEKTOR PADA TUNGKU PELEBURAN PERUNGGU UNTUK MENINGKATKAN KINERJA PRODUKSI GAMELAN BALI I G N Priambadi; I. G. K Sugita; I Putu Lokantara; I. M. Parwata; K Astawa
Buletin Udayana Mengabdi Vol 13 No 2 (2014): Vol 13, No. 2 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

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Abstract

Gamelan melting process (casting) plays a role in the process of making Balinese gamelan. Furnace is a major component in this melting process. Craftmen use traditional melting furnace with an open form in which the air flow is needed in the injector fuel combustion using the straight shape. Injector of this model provides less air flow evenly so that the combustion process takes quite a long time. Ergo thermal injector has been introduced in service activities in the village craftmen group Tihingan Banjarangkan District of Klungkung. This furnace has the airflow coming out of the blower which then flows in a flow-shaped convergent-divergent. The function of this model is that the pressure of the incoming air flow passes into the air injectors to increase and spread evenly in the furnace chamber. Craftmen were trained directly how to make this model kitchen and directly transform traditional stoves with models furnace injector is introduced. The results showed that the combustion of fuel use was decreased by 12.96%. Fuel savings resulting from the latest injector models can provide the required distribution of air in the combustion process fuel (charcoal) to be more perfect and resulting high temperatures generated high. Supply of combustion air more evenly on the charcoal have an impact on the optimum combustion processKeywords: gamelan, injector, bronze alloys, smelting
Mekanisme Aus Baja Karbon AISI 1065 pada Permukaan Kontak Basah Akibat Beban Kontak Gelinding-Luncur I Made Widiyarta; I Made Parwata; I Made Gatot Karohika; I Putu Lokantara; Made Arie Satryawan
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Dalam proses kontak gelinding-luncur, permukaan kontak yang basah karenaterperangkapnya air di daerah permukaan kontak dapat mengurangi kontak adhesi [Chen etal., Wear 253 (2002)]. Kondisi tersebut mungkin dapat mempengaruhi mekanismekegagalan aus material. Pada penelitian ini, tingkat keausan dan mekanisme aus materialakibat beban gelinding-luncur pada kondisi permukaan kontak basah diinvestigasi. Ujikeausan dilakukan dengan alat uji kontak dua disk dan material uji dipilih adalah baja karbon0.65%C dengan tekanan maksimum 750MPa dan rasio slip-roll 5%. Untuk uji aus padakondisi kontak basah, air diteteskan secara kontinyu pada permukaan kontak disk. Dari hasiluji terlihat dengan adanya air dipermukaan kontak, tingkat keausan yang terjadi mengalamipenurunan yang cukup besar sekitar 50% yaitu dari 6x10-4 ?m/putaran untuk kontak keringmenjadi 3x10-4 ?m/putaran pada kontak basah. Hal ini dapat terjadi mungkin diakibatkanoleh air yang ada dipermukaan kontak mampu membatasi areal kontak antara dua meterialkontak tersebut sehingga menurunkan gesekan yang terjadi dan mengakibatkan keausanmenurun. Pada kontak basah, material yang mengalami regangan geser plastis hanyaterjadi higga kedalaman kurang dari 100 ?m dan pada kontak kering regangan geser plastisdapat terjadi hingga kedalaman sekitar 400 ?m.Kata kunci: Baja karbon, kontak basah, ausIn rolling-sliding contact, the wet surface as a result of water trapped in the contact area canreduce adhesion [Chen et al., Wear 253 (2002)]. This condition may influence themechanism of wear on the contact material. In this work, the wear rate and wearmechanism of material on the wet contact surface were investigated. Wear test wasconducted using disc-to-disc contact test and carbon steel (0.65%C) was chosen as the testmaterial with the maximum pressure of 750MPa and slip-roll ratio of 5%. For the wear testwith the wet contact, water was dropped continuously on the contact surface. The resultsshow the wear rate on the material with wet contact was decrease significantly by about 50%i.e., from about 6x10-4 ?m/cycle for the dry contact to about 3x10-4 ?m/cycle for the wetcontact. This may be caused by the water trapped on the contact area reduces the contactadhesion between both the contact materials and causes the friction to decrease, andresulting wear to decrease. For the wet contact, the plastic shear strain on material occurredinto depth less than 100 ?m, and for the dry contact, the plastic shear strain on materialoccurred into depth about 400 ?m..Keywords: Carbon steel, wet contact, wear
Kekasaran Permukaan Baja Karbon Sedang Akibat Proses Sand-Blasting dengan Variasi Jarak Nosel I Made Widiyarta; I Made Parwata; I Putu Lokantara
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Proses sand-blasting merupakan proses yang dilakuan untuk membersihkan dan merubah kekasaran permukaan material. Proses ini umumnya dilakukan sebelum melakukan proses pelapisan permukaan material dengan tujuan untuk meningkatkan daya rekat lapisan pada permukaan material yang dilapisi. Pada penelitian ini, proses sand-blasting dilakukan pada baja karbon sedang dengan variasi jarak nosel untuk memperoleh perubahan kekasaran permukaan material. Hasil pengujian menunjukkan perubahan jarak nosel pada proses sand-blasting memberikan pengaruh yang cukup signifikan pada kekasaran permukaan. Kata kunci: sand-blasting, baja karbon sedang, kekasaran permukaanAbstract:Sand-blasting is a process of surfaces treatment to clean and to roughen surface of material. This process is commonly used in preparing the surface before the coating process in order to increase the bond strength of the coating material on the surface of substrate material. In this work, sand-blasting process is conducted to the medium carbon steel with varying nozzle distance to the surface of material. The experiment results show the different nozzle distance causes the change of surface roughness significantly. Keywords: sand-blasting, carbon steel, surface roughness
Perbandingan karakteristik shock breaker standar dan modifikasi pada sepeda motor I Made Parwata; IGN Nitya Santhiarsa; Benatyar -
Jurnal Energi Dan Manufaktur Vol 1, No 1 Juni 2006
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

During driving, vibration is one of some comfortable point. Vibration can appear as the result of road surface beside itsengine vibration. To decrease vibration caused road surface the vehicle was completed with shock breaker. This experiment was conducted in order to investigate the effect of vibration on the comfortable in driving. The shock breaker and body of vehicle will be modeled in single degree of freedom in the vibration system. By using two-model shock breaker standard and modification hence the model was tested, and then the results were applied to Janeway criteria to examine its comfortable. From both the experiment and calculation, it was found that the amplitude of standard and modification shock breakerexceeded the maximum allowable amplitude of Janeway comfortable criteria.
KARAKTERISTIK LAPISAN NiCr PADA BAJA KARBON SEDANG DENGAN METODE PELAPISAN FLAME SPRAY COATING DENGAN VARIASI JARAK SEMPROTAN I Made Widiyarta; I Made Parwata; I Putu Lokantara; Davin Perangin-Angin
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 2 No 1 (2016)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Karakteristik lapisan NiCr pada baja karbon sedang dengan proses pelapisan powder flame spray coating dengan variasi jarak nosel penyemprotan terhadap permukaan material yang dilapisi (20 mm, 30 mm dan 40 mm) diinvestigasi. Hasil lapisan menunjukkan pada jarak penyemprotan 20 mm dan 30 mm terlihat hasil lapisan merata dan tidak terdapat celah antara material pelapis dan material induk. Sedangkan untuk hasil pelapisan pada jarak penyemprotan 40 mm memperlihatkan munculnya porosity, partikel pelapis yang tidak cair dan terdapat oksidasi/jarak antara material pelapis dan material induk.
Karakteristik kekerasan material dibawah permukaan akibat pemanasan-awal substrate dalam proses thermal coating Mustika Mustika; I Made Widiyarta; I Made Parwata; I Putu Lokantara
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 1 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Dalam proses flame spray coating, pemanasan awal terhadap material inti sangat diperlukan untuk mengurangi tegangan sisa dan menyatunya material pelapis pada permukaan substrate material menjadi lebih baik. Suhu pemanasan awal tersebut tentunya akan mempengaruhi sifat kekerasan substrate material hingga kedalaman tertentu.Pada penelitian ini, pelapisan panas (flame powder spray coating) dilakukan pada baja karbon sedang dengan material pelapis NiW. Pemanasan awal dilakukan pada permukaan substrate material dengansuhu yang bervariasi (300ºC, 400ºC dan 500ºC). Dari penelitian yang telah dilakukan dapat diketahui bahwa tidak ada pengaruh antara variasi preheating dengan kekerasan material pelapis Ni-W hasil dari powder flame spray coating. Semakin ke dalam kekerasannya semakin berkurang hingga mencapai kekerasan material inti yang seragam. Material substrate mengalami sedikit pengerasan hingga jarak 0.5 mm dari boundary. In the process of the flame spray coating, pre-heating of the substrate is required in order to reduce residual stress and to improve the adhesion of the coating material on the substrate. The pre-heatingtemperature also has an effect on the hardness of substrate material into a certain depth. In this study, flame powder spray coating was performed on the medium carbon steel with the coating material NiW. Pre-heating on the substrate material was varied of about 300ºC, 400ºC and 500ºC. From the experiments, the variation of pre-heating was not affect the hardness of coating material NiW. The increase of depth form the surface, the hardness of the material decrease until the hardness of the material is uniform. The hardness of the substrate material was change into depth of about 0.5 mm from boundary layer.
Co-Authors A. A. G. Wirayoga Benatyar - Brodjonegoro, S. S Budiwantoro, B Davin Perangin-Angin Dwipayana, Dwipayana I Gusti Ngurah Nitya Santhiarsa I Gusti Ngurah Priambadi I Ketut Adi Sugita I Made Gatot Karohika I Made Widiyarta K Astawa Made Arie Satryawan Mustika Mustika Puja, I. W Putu Lokantara W. Putra