Article Per Year (5 Year)
p-Index From 2019 - 2024
0.983
P-Index
This Author published in this journals
All Journal Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur TEKNIK Sinergi Sibatik Journal : Jurnal Ilmiah Bidang Sosial, Ekonomi, Budaya, Teknologi, Dan Pendidikan
I Made Gatot Karohika
Jurusan Teknik Mesin Universitas Udayana, Kampus Bukit Jimbaran Bali
Arts Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Social Sciences

Published : 14 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 14 Documents
Search

 1   2 
Sealing Performance Layered Metal Gasket Based on the Simulation Method Karohika, I Made Gatot; Haruyama, Shigeyuki; Antara, I Nyoman Gde; Budiarsa, I Nyoman; Penindra, I Made Dwi Budiana
TEKNIK Vol 41, No. 1 (2020): May 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (803.986 KB) | DOI: 10.14710/teknik.v41i1.26125

Abstract

Studies for corrugated metal gaskets are still ongoing to improve its performance. This is considered to be a single gasket with SUS304 material when contact with flanges that have greater surface roughness, reduced contact width and plastic deformed contact surfaces are incomplete and cannot fill the surface roughness of flanged flanges. The use of softer material than the base material as a surface covering material is used to improve the performance of the gasket. In this study, therefore the effect of modulus of elasticity ratio and thickness ratio on contact width and contact stress, 25A three-layer metal gasket was investigated using Finite Element Analysis. The results showed that the material with tangent modulus, Ehal = Eal / 150 had the highest slope for contact width. While the contact width of the plastic mode gasket is higher than the elastic mode gasket.
PENERAPAN MESIN PENGEPRES KRUPUK SPIRAL UNTUK MENINGKATKAN EFFISIENSI DAN KAPASITAS PRODUKSI KRUPUK PADA INDUSTRI KECIL Adi Atmika I K; I M. Gatot Karohika; Igp A. Suryawan
Buletin Udayana Mengabdi Vol 10 No 1 (2011): Volume 10 No.1 – April 2011
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (217.851 KB)

Abstract

The process of producing krupuk traditionally passes some steps because it is still used the manual or conventional utensils, however the pressing step requires more sufficient time. Method used to overcome the above problems is by designing and making a machine of semiautomatic pressing row material. This machine is regulated by the electromotor transmission through belt which is fastened upon by pulley, and the rotation is reduced by gear with ratio 50: 1 to get the low rotation at primary axis. This designed machine can make a move to shuffle through as the wanted process. This community service activity was conducted for a group business of krupuk owned by Made Santa in Batubulan village on 25th and 27th August 2009. This Machine application turned out to improve the production capacities reaching 400 %.
Penggunaan Alat Cetak untuk Produksi Jaja Saga Dewa Ngakan Ketut Putra Negara; I M Gatot Karohika; I D M Krishna Muku
Buletin Udayana Mengabdi Vol 15 No 1 (2016): Jurnal Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.512 KB)

Abstract

Every place in Bali has a food specific characteristic. Gianyar region is known with its jaja klepon and Klungkung is famous with serombotan. In Melinggih Kelod Village, District of Payangan is developing a type of food, called jaja saga. Micro industries of producing this food are made by some households in this village. The steps of making jaja saga follow; preparing of row materials (coconut, rice powder, sugar, salt and water), mixing of the row materials, leveling of row materials on the taplon and roasting. After 10 minutes jaja saga has cooked. The final process is packaging. The leveling of row materials on the taplon process is the stage that needs the long enough time; it is about 5 to 8 minutes. To overcome the problem, it is made a molding jaja saga device. The principle work of the device is by pressuring a circle-pressure device with 17.90 cm in diameter trough a mold hole with 18 cm in diameter. Pressuring mechanism is undertaken by chain, sprocket and thread of the screw transmission with handle mover. The results of device test show that device work mechanism has successfully worked but improving regarding with the type of row materials used is needed so better results will be obtained.
PENINGKATAN PRODUKTIVITAS KOPERASI SERBA USAHA ”SUBAK KEDUA”MELALUI PENERAPAN MOBIL SLEP “3 IN 1” Budiana D; A. Subagia; A. Suryawan; G. Karohika
Buletin Udayana Mengabdi Vol 9 No 1 (2010): Volume 9 No.1 – April 2010
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (942.549 KB)

Abstract

ABSTRAC Peguyangan Kangin village has rice land about 77.65% of the total area of the village, and 37.33% of the population in the village has a daily job as farmers and laborers of farms.Most of the farmers and rural laborers in Peguyangan Kangin has joined 3 subak organisations. One of the Subaks is the second subak Peguyangan Kangin having Koperasi Serba Usaha. Types of the cooperation operation are such as savings and loan units, units of livestock, fisheri existes units, and units of service. Based on profile data Peguyangan Kangin village in 2008, control of economic assets was handled by the public in the form of assets and agricultural machinery industry . There are only 2 engines and 3 rice mills tractor operates in this village, and they belong to personal property ownership status. if the ratio is calculated using the average means the rice milling machine 1 serving approximately 151.9 hectares of rice fields. It means facilities of agricultural machinery is still unadequate and the distance from the fields to place far enough away so that the mill needs transport that eventually lead to the transportation costs burdening farmers. Through the program ‘vucer team’ that has been successfully designing and building cars slep 3 in 1 whereas the car is equipped with a diesel engine dafa 24 pk brand that serves to move the 3 engines at once; slep machines, polishing machines, and machine rice thresher. From the results of experiments or demonstrations using cars slep 3 in 1 is obtained very satisfactory results, which in this 1-hour car can get as much slep dried grain with 125 kg of very clean rice yields.
PENINGKATAN PRODUKSI DAN DIVERSIFIKASI PRODUK DENGAN MESIN TEKNOLOGI TEPAT GUNA I.K. A. Atmika; I.G.A.K. Suriadi; I.M.D. Budiana; I.M.G. Karohika
Buletin Udayana Mengabdi Vol 18 No 2 (2019): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.625 KB) | DOI: 10.24843/BUM.2019.v18.i02.p16

Abstract

Industri kecil menghadapi sejumlah permasalahan terkait produksi antara lain : 1)Proses penyangraian kacang menggunakan mesin penggulingan yang relatif sederhana dengan daya tampung yang terbatas berbahan dasar plat baja serta mudah berkarat. 2)Pengemasan produk yang masih manual dengan tangan dan menggunakan lilin untuk merekatkan plastic pembungkus. 3)Pengadukan bumbu masih secara manual sehingga kurang merata. Kegiatan pengabdian dimulai dari perancangan teknis dan pembuatan alat/mesin, kemudian kegiatan di lapangan dilaksanakan untuk pengenalan/peragaan alat serta pengenalan keselamatan kerja di UD Mekar Sari dilaksanakan. Kegiatan lapangan dilaksanakan pada tanggal 04 Agustus 2018. Kegiatan diikuti oleh 15 orang peserta dari berbagai pihak antara lain anggota UD Mekar Sari, tim pelaksana pengabdian, mahasiswa Teknik Jurusan Teknik Mesin Universitas Udayana, beberapa wakil dari masyarakat setempat. Setelah pengujian dilapangan terdapat peningkatan produksi sebesar 498% atau hampir lima kali lipat. Setelah dilakukan kegiatan pengabdian dapat disimpulkan bahwa kegiatan penyuluhan tentang pentingnya teknologi tepat guna terutama yang berkaitan dengan usaha mereka serta demo dan penyerahan alat hasil rancangan mendapat respon yang baik. Kata kunci : diversifikasi, mesin sangrai, daya tampung, pengabdian, peningkatan produksi.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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
Proses Pembentukan Gasket berlapis dengan Metode Elemen Hingga I Made Gatot Karohika; I Nyoman Gde Antara
Jurnal Energi Dan Manufaktur Vol 11 No 2 (2018): Published in Oktober 2018
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (743.99 KB) | DOI: 10.24843/JEM.2018.v11.i02.p06

Abstract

Perkembangan metode elemen hingga memberikan kemudahan bagi para peneliti untuk memprediksi proses dan hasil forming suatu produk sehingga kegagalan bisa dicegah lebih awal dan biaya karena cacat produk bisa dihindari. Pada penelitian ini, proses forming metal gasket three-layer bentuk bergelombang akan di investigasi dengan analisa simulasi yang menggunakan metode elemen hingga. Kesesuaian bentuk produk gasket dengan cetakan mempengaruhi performance gasket tersebut saat proses tightening. Dimensi cetakan gasket menggunakan cetakan gasket 400MPa-mode dengan variasi ketebalan surface layer. Base material menggunakan SUS304 dan surface layer menggunakan ratio modulus elastis 0.1 dan 0.5. Hasil simulasi menunjukkan bahwa gasket forming tidak memenuhi cetakan dan pada bagian puncak gelombang gasket terjadi lekukan. Besarnya lekukan pada puncak gelombang menurun dengan naiknya ketebalan surface layer. The development of finite element methods help the researchers to predict the process and the result of product forming so that failure can be prevented earlier and costs due to product defects can be avoided. In this study, the process of forming metal gaskets of corrugated three-layer forms will be investigated by simulation analysis using finite element method. The suitability of the shape of the gasket product with the mold affects the performance of the gasket during the tightening process. Gasket mold dimensions use 400MPa-mode gasket molds with surface layer thickness variations. Base material using SUS304 and surface layer using Aluminum. The simulation results show that the forming gasket did not fill the mold and at the peak of the gasket convex occurs indentation. The amount of indentation at the convex of the wave decreases with the increase in surface layer thickness.
The Influence of Flow and Type of Variation in The Welding Electrode SMAW Against Carbon Steel Mechanical Propertis I Made Gatot Karohika
Jurnal Energi Dan Manufaktur Vol 3, No.2 Oktober 2009
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.353 KB)

Abstract

Welding is a joining process of 2 or more metal that is widely used in industry. To obtain good welding result it is needed appropriate filler and weld parameters to avoid weld defect and wide deference of mechanic properties between welded metal and base metal.In this experiment we used different filler and current (E 6010, 7018 ? 2,5mm ? 350mm , 100 dan 130 A)and use material carbon steel AISI 1045 and SMAW welding method. Rockwell C Hardness tested in welded metal, HAZ, and base metal area.The hardness number in welded metal and HAZ is reported higher than base metal area, the hardness number of welded metal and HAZ that use current 130 is higher than that one than use current 100 A,and hardness number in base metal relatifely similar. The hardness number of welded metal that use electrode 7018 is higher than hardness number of welded metal that use electrode 6010, and hardness number of HAZ and base metal is not affected significantly by the types of electrode.
Sifat Mekanis Komposit Polyester dengan Penguat Serat Sabut Kelapa I Made Astika; I Putu Lokantara; I Made Gatot Karohika
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (400.971 KB)

Abstract

AbstrakPenggunaan serat alam sebagai penguat komposit dalam beberapa tahun terakhir inimengalami perkembangan yang sangat pesat. Salah satunya adalah serat sabut kelapa.Potensi sabut kelapa yang begitu besar belum dimanfaatkan sepenuhnya untuk kegiatanproduksi yang mempunyai nilai tambah ekonomis. Dengan tidak adanya pemanfaatan yangoptimal, sabut kelapa ini hanya akan menjadi limbah dan menimbulkan masalah lingkungan.Penelitian ini bertujuan untuk menyelidiki sifat mekanis yaitu kekuatan tarik, impact dan lenturdari komposit polyester yang diperkuat dengan serat sabut kelapa. Di masa depan, kompositini dapat digunakan sebagai asesoris kendaraan, plafon ataupun papan sebagai penggantikayu, eternit, bambo dan gipsun yang harganya mahal dan relatif tidak tahan air. Kompositdibuat dengan memanfaatkan serat sabut kelapa dan matriks resin Unsaturated-Polyester(UPRs) jenis Yucalac 157 BQTN, campuran 1 % hardener jenis MEKPO (Methyl Ethyl KetonePeroxide) dan perendaman serat dalam larutan alkali NaOH 5%. Metode produksi yangdigunakan adalah press hand lay up dengan orientasi serat acak. Desain komposit denganvariasi fraksi volume serat 20, 25 dan 30% dan variasi panjang serat 5, 10 dan 15 mm. Hasilpenelitian menunjukkan bahwa semakin besar fraksi volume dan panjang serat dalamkomposit maka kekuatan tarik, impact dan lentur semakin tinggi. Mode patahan yang teramatiadalah patah getas, debonding, pullout dan crack deflection.Kata kunci: Komposit, sabut kelapa, sifat mekanis, mode patahanAbstractThe use of natural fibers as reinforcement of composites in recent years has been developingvery rapidly. One of the natural fiber, coconut coir fiber has not been fully utilized for theproduction activities, so it is just going to be a waste and cause environmental problems. Thepurpose of this study is to investigate the mechanical properties i.e. tensile strength, impactstrength and flexural strength of composites coir fiber. In the future this material can be usedfor vehicle accessories, ceilings and cabinet and will be able to replace the wood, eternit,bamboo and gipsun which are high price and lower water resistance.The research materialmade with coconut coir fiber as reinforcement and matrix resin unsaturated polyester (UPRs)type Yukalac BQTN 157, with 1% hardener types MEKPO (Methyl Ethyl Ketone Peroxide) andfiber treatment by 5% NaOH. Production methods are press hand lay-up and the variations offiber volume fraction are 20, 25 and 30% and fiber length are 5, 10 and 15 mm. Testing ofmechanical properties are impact test (ASTM - D256), tensile test (ASTM - D3039) and flexuraltest (ASTM - D790). The results of research show that the longer of fiber and the bigger offiber volume fraction, the higher of tensile strength, impact strength and flexural strength areobtained. The fracture mode are overload, debonding , pullout and crack deflectionKeywords: Composites, coir fiber, mechanical properties
Pendekatan Malcolm Baldrige Criteria For Performance Excellent (Education Criteria) dalam Perancangan Sistem Pengukuran Kinerja Fakultas Teknik Univeritas Udayana menuju Sertifikasi AUN-QA I Made Dwi Budiana Penindra; I Made Gatot Karohika
Jurnal Energi Dan Manufaktur Vol 13 No 2 (2020)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JEM.2020.v13.i02.p06

Abstract

The Faculty of Engineering, Udayana University is one of the faculties in Udayana University. The Faculty of Engineering has 5 departments that have a lot of interest. Currently, the Faculty of Engineering is preparing to support Udayana University in obtaining the Asean University Network - Quality Assurance (AUN-QA) certification which is targeted for a visitation in 2021. One of the supporters in obtaining this certification is that the Faculty of Engineering must have a performance measurement system. In this research using an integrated performance measurement system that designed through the Malcolm Baldrige Criteria For Performance Excellent (Education Criteria) approach which is integrated with several methods, namely IPMS in determining the Key Performance Indicator (KPI) which becomes a determining indicator of later performance. assisted by using the Analytical Hierarchy Process (AHP) method in giving the weight of each KPI. After the KPI has a weight, then a comprehensive scoring is carried out using the Objectives Matrix (OMAX) method so that an index number per period is generated which is the reference for the level of performance of the department, as well as a Traffic Light System (TLS) to find out which KPIs require improvement based on color. With the creation of an integrated performance measurement system, it is hoped that the Faculty of Engineering can make continuous improvements. The results showed that the Performance Indicator from the Faculty of Engineering in this period was 427.19 with 24 KPIs being measured. The Performance Indicator shows that the overall performance of the Faculty of Engineering is above average (300). Only 2 categories are in the red zone of 21%, namely Student Criteria (KPI 1 and KPI 4) and Management Criteria (KPI 18, KPI 19, and KPI 20). In the following year, the Faculty of Engineering must focus on the five KPIs so that later they can improve performance.
Co-Authors A. Suryawan Bagus Gde Didit Citra Anggarana Budiana D Dewa Ngakan Ketut Putra Negara Haruyama, Shigeyuki I D M Krishna Muku I Dewa Gede Ary Subagia I Gusti Agung Kade Suriadi I Ketut Adi Atmika I Made Dwi Budiana Penindra I Made Parwata I Made Widiyarta I Nyoman Budiarsa . I Nyoman Gde Antara I.K. A. Atmika I.M.D. Budiana Igp A. Suryawan M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Made Arie Satryawan Nanda - NPG Suardana Putu Lokantara Shigeyuki Haruyama