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INDONESIA
Jurnal Energi Dan Manufaktur
Published by Universitas Udayana
ISSN : 23025255     EISSN : 25415328     DOI : -
Core Subject : Science, Engineering,
Energy Industrial & Manufacturing Engineering
"Jurnal Energi dan Manufaktur" is a journal published by Department of Mechanical Engineering, University of Udayana, Bali since 2006. During 2006-2011 the journal's name was "Jurnal Ilmiah Teknik Mesin CAKRAM" (Scientific journal in mechanical engineering, CAKRAM). "Jurnal Energi dan Manufaktur" is released biannually on April and October, respectively. We invite authors to submit papers from experimental research, review work, analytical-theoretical study, applied study, and simulation, in related to mechanical engineering (energy, material, manufacturing, design) to be published through "Jurnal Energi dan Manufaktur".
Arjuna Subject : -
Articles 387 Documents
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Pengaruh Penempatan Penghalang Berbentuk Silinder Pada Posisi Vertikal Dengan Variasi Jarak Horisontal Di Depan Silinder Utama Terhadap Koefisien Drag Si Putu Gede Gunawan Tista
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

One of the ways to reduce energy consumption on the air plane and the other bluff bodies are by decreasing the drag. Dragis closely related to the flow separation. The earlier separation, then the drag will increase more. Based of the fact the effortto decrease drag is conducted by manipulating the field of fluid flow. Stream manipulation was be done by installingcylindrical obstacle in front of main cylinder. The purpose of this research is to analyze the effect of placement cylindricalobstacle at vertical position in the various horizontal distance in front of main cylinder on drag coefficient . In thisresearch, the experiment was conducted in the wind tunnel, which consisted of blower, pitot pipe, manometer, cylinder pipe,and cylinder rod. The cylindrical obstacle was positioned at vertical (y=14 mm) in the various horizontal distanceL/D = 1.41, L/D = 1.56, L/D = 1.72, L/D = 1.88, L/D = 2.03, L/D = 2.19, and L/D = 2.81 by upstream from the maincylinder. Diameter cylinder obstacle was 8 mm.. The Reynolds number based on the main cylinder diameter (D = 42 mm)was Re = 3.42 x 104. The research results showed that the cylinder rod could decrease the drag coefficient of main cylinder.Drag coefficient for cylinder without cylinder rod was 0.167 while the biggest decrease of coefficient of drag with cylindricalobstacle was happened at L/D = 1.72 which was 0,0593. It means that the drag coefficient of main cylinder with cylindricalobstacle was 64.5% lower than the cylinder alone.
Fuel Feeder of Screw Type for Biomass Fuel I Nyoman Suprapta Winaya; I B Ardhikayana; I Gst. Ngrh.Pt. Tenaya
Jurnal Energi Dan Manufaktur Vol 3, No.2 Oktober 2009
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Fuel Feeder of Screw Type for Biomass Fuel
Perancangan Rasio Sistem Transmisi Kendaraan Penggerak Roda Belakang Untuk Meningkatkan Kinerja Traksi IGAK Suriadi; I Ketut Adi Atmika
Jurnal Energi Dan Manufaktur Vol 9 No 1 (2016): April 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Gaya traksi yang terjadi pada bidang kontak roda penggerak dan jalan dipengaruhi oleh banyak faktor diantaranyaadalah: karakteristik torsi mesin, karakteristik kopling, rasio dan tingkat transmisi, rasio gardan, karakteristik propellershaft, diameter efektif roda, karakteristik kontak roda dan jalan. Dari sekian banyak parameter yang mempengaruhisalah satu yang sangat besar pengaruhnya adalah rasio dan tingkat transmisi atau disebut rasio sistem transmisi.Besarkecilnya traksi untuk setiap tingkat gigi serta kecepatan kendaraan yang mampu dicapai dapat dikendalikan denganmengatur atau merancang rasio dan jumlah tingkat kecepatan gigi transmisi, sehingga didapatkan kinerja traksi yangoptimum.Penelitian ini bertujuan untuk menguji dan mengkaji kinerja traksi sistem transmisi kendaraan roda empatkondisi standar dengan penggerak roda belakang, memodifikasi/merancang sistem tersebut. Kemudian melakukananalisa kebutuhan gaya traksi yang diperlukan serta kemampuan traksi yang mampu dihasilkan sistem transmisistandar dan sistem transmisi hasil perancangan ketika melewati berbagai kondisi jalan.Metode penelitian yangdilakukan dimulai dengan pengujian/eksperimen, dimana pengujian dilakukan untuk menguji mesin kendaraanpenggerak roda belakang pada chassis dinamometer untuk mendapatkan data besarnya daya di poros penggerak, torsidan kecepatan yang mampu dihasilkan oleh kendaraan pada setiap interval kenaikan mesin pada tiap rasio gigitransmisi. Selanjutnya dari data-data yang terkumpul dilakukan modeling, simulasi, dan analisa dengan menggunakansistem transmisi standar, sistem transmisi hasil perancangan dengan progresi geometri bebas terhadap kebutuhantraksi pada kendaraan ketika melintasi kondisi jalan tertentu. Sistem tranmsisi hasil rancangan menghasilkan traksimaksimum sebesar 12000 N sedangkan sistem transmisi standar sebesar 10500 N, denganjarak antara kurva gigi yangberdekatan semakin dekat. Perancangan atau modifikasi ratio dengan 6 tingkat kecepatan menghasilkan kinerja traksiyang paling baik.Kata kunci: Gaya traksi, rasio gigi, jumlah tingkat kecepatan, progresi geometri bebasAbstract:Traction force that occurs in the contact area and the drive wheel is influenced by many factors such as: thecharacteristics of the engine torque, clutch characteristics, ratio and rate of transmission, axle ratio, and characteristicsof the propeller shaft, the effective diameter of the wheels, the wheels and the road contact characteristics. Of the manyparameters which affect one of the very big influence is the ratio and the level of transmission or the ratio transmissionsystem. The traction for any level of gear and vehicle speed that can be achieved can be controlled by designing ratiosand the number of levels of the transmission gear speed, so we get optimum traction performance. This study aims toexamine and assess the performance of traction transmission system of vehicles with the standard conditions ofrearwheel drive, modify/designing the system. Then do a needs analysis and the traction force necessary tractioncapabilities are able to produce a standard transmission systems and transmission system design results when passingthrough various road conditions. Research methodology begins with experimentation, where testing is done to test theengine rearwheel drive vehicle on the chassis dynamometer to obtain the magnitude of the driving shaft power, torqueand speed that can be produced by the vehicle at each interval increment on each engine transmission gearratios.Furthermore, from the data collected do modeling, simulation, and analysis using a standard transmissionsystem, transmission system design results in geometric progression independent of the need for traction on a vehiclewhen passing certain road conditions. Tranmsisi system design results generate maximum traction at 12000 N while thestandard transmission system amounted to 10500 N, with the distance between adjacent tooth curves getting closer.The design or modification ratio with 6 levels of speed to produce the most good traction performance.Keywords: Traction, gear ratio, amount level stage, rolling resistance
Rancangan alat potong tebu semi otomatis yang ergonomis Dirgahayu Lantara; Nurhayati Rauf; Muhammad Dahlan; A. Pawennari
Jurnal Energi Dan Manufaktur Vol 10 No 1 (2017): April 2017
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak Penebangan tebu yang dilakukan pada lokasi perkebunan tebu PT. Perkebunan Nusantara XIV (Persero), yang dilakukan oleh petani pemotong tebu yang berada disekitar lokasi perkebunan pabrik, dengan menggunakan alat tradisional (Parang). Sedangkan tenaga kerja yang didatangkan dari luar Sulawesi – Selatan dengan menggunakan sabit. Alat potong tebu Semiautomatis Yang Ergonomis, dirancang berdasarkan Ukuran tubuh (badan) Petani pemotong tebu, tinggi batang tebu, diameter batang tebu, kondisi lahan dan cara kerja petani pemotong tebu pada saat melakukan aktivitas penebangan. Sehingga Alat Potong Tebu Semi Otomatis yang Ergonomis ini diharapkan memberikan hasil tebang yang lebih baik dari alat potong yang digunakan saat ini. Disamping itu energi yang digunakan pada saat melakukan aktivitas penebangan lebih kecil, agar petani pemotong tebu dapat tahan lebih lama untuk bekerja. Percobaan Alat Potong Tebu Semi automatis yang ergonomis ini dilaksanakan pada lokasi perkebunan Pabrik Gula Bone. Kata kunci: Petani, Tebu, Ergonomi, Rekayasa Teknik Abstract Cane harvesting that conducted on cane plantations site at PT. Perkebunan Nusantara XIV (Persero), by cane farmers in around the plant’s plantation site by using traditional tools (machetes). While labor brought in from outside South Sulawesi by using a sickle. Egronomic cane harvester semi-automatic, designed based on the farmer’s body size, stalk height of cane, diameter of cane, soil conditions and the procedure of farmer’s cane cutters at the time of harvesting activities. So that the egronomic cane harvester semi-automatic is expected to give better harvest results of harvester used today. In addition, the energy used at the time of harvesting is smaller, so that care farmers able to work in a long time. The testing of egronomic cane harvester semi-automatic was conducted on the sugar mills plantations of Bone. Keywords: Farmers, Sugarcane, Ergonomics, Engineering design
Karakteristik Kekuatan Bending Kayu Komposit Polyester Diperkuat Serat Pandan Wangi dengan Filler Serbuk Gergaji Kayu Nasmi Herlina Sari; IGNK Yudhyadi; Emmy dyah S
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

AbstrakBeberapa kelemahan kayu yang tidak memungkinkan mendapat papan yang lebar dan stabil,maka dimulailah dibuat papan buatan dengan berbagai cara pengerjaan dan jenis papanbuatan. Penelitian ini bertujuan untuk mengetahui karakteristik kayu komposit polyester yangdiperkuat oleh serat pandan wangi dan serbuk kayu gergaji. Pembuatan kayu kompositdilakukan dengan menggunakan teknik hand lay up. Material penyusun kayu komposit adalahserat pandan wangi dengan variasi panjang serat 15 mm, 20 mm, 25 mm, 50 mm dan 100 mm,dan fraksi volume serat 20% dan 30% dan filler serbuk kayu gergaji sengon 5% (fraksivolume). Perekat yang dipakai adalah resin polyester dengan hardener 1% metil etil peroksida.Pengujian bending telah dilakukan dengan metode three point bending dan telah dianalisisstatistik menggunakan Two Way ANOVA. Hasil penelitian menunjukkan bahwa pada fraksivolume 20% serat, menunjukkan terjadinya kecenderungan peningkatan kekuatan bendingpada variasi panjang serat 15, 20, 25, 50 (mm) dengan rata-rata kekuatan bending secaraberurutan masing-masing sebesar 56,7 Mpa, 67 Mpa, 90 Mpa dan 93.33 Mpa. Selanjutnyanilai terendah dimiliki oleh kayu komposit dengan panjang serat 100 mm yaitu sebesar 78.3Mpa. Sedangkan pada fraksi volume serat 30% dengan variasi panjang serat yang samacenderung meningkat pada variasi panjang serat 15 mm, 20 mm dan 25 mm secara berurutanyaitu sebesar 77 Mpa, 86.1 Mpa, dan 93.6 Mpa tetapi kayu komposit dengan panjang 50 mmdan 100 mm cenderung menurun dengan nilai kekuatan bending berurutan yaitu sebesar76.11 Mpa dan 73.6 Mpa.Kata kunci: Kayu komposit, serat pandan wangi, filler, serbuk gergaji kayu, polyesterAbstractSome disadvantages of wood that does not allow the board received a wide and stable, thenbegan the boards made workman ship made in various ways and types of artificial board. Thisstudy aimed to investigate the characteristics of composite wood polyester reinforced bypandannus amaryllilofius fiber and sawdust. Manufacture of wood composites made usinghand lay-up techniques. Constituent materials of the composite wood is fiber length variation offiber 15 mm, 20 mm, 25 mm, 50 mm and 100 mm, and the fiber volume fraction of 20% and30%, while sengon sawing wood dust 5% filler (volume fraction). the matrix is using polyesterresin with 1% hardener from metal etil keton peroxide. And then bending testing was done withthree point bending method. and then statistic analysis was done using two way ANOVA. Theresults showed that at 20% fiber volume fraction, showed an increasing trend in the variation ofbending strength fiber length 15, 20, 25, 50 (mm) with an average bending strengthsequentially respectively 56.7 MPa, 67 MPa, 90 MPa and 93.33 MPa. Furthermore, the lowestvalue is owned by a wood composite with a fiber length of 100 mm is equal to 78.3 Mpa. Whilethe fiber volume fraction of 30% with a variation of the same fiber length is 15 mm, 20 mm, 25mm, 50 mm and 100 mm are also experiencing an increasing trend in the variation of fiberlength of 15 mm, 20 mm and 25 mm respectively amounting to 77 Mpa , 86.1 MPa and 93.6Mpa. But composite wood with a length of 50 mm and 100 mm tends to decline with successivebending strength value that is equal to 76.11 MPa and 73.6 MPa.Key Word: Composites wood, pandanus amaryllifolius of fiber, filler, sawdust wood, polyester
Perilaku kekuatan fatigue paduan aluminium seri 2014 akibat proses termomekanikal aging Sujita -
Jurnal Energi Dan Manufaktur Vol 3, No.2 Desember 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Aluminium alloy seri 2014 is material which is often used in industry. Because excellence of mechanic properties. But also have the weakness at properties of strength fatigue. Though fatigue strength is important parameter in desain, especially if application at condition of dinamic loading, so that need the treatment to improve it. Fatigue strength go together the micro structure and mode of failure of failure of effect of stress concentration. Aging treatment ordinary done not yet given the influence which even on the contrary. Inconsistence of fatigue strength alluminium alloy show the phenomenon which must be research instructing at repair of fatigue strength , so that need the advanced treatment in the form of termomechanical aging. The research conducted by using alluminium alloy series 2014 formed by specimen fatigue test of the size diameter 8 mm and long 87 mm relate at standart (ASTM E 513), continued treatment of termomechanical aging, tested the fatigue, and monitoring microstructure of change. By structure micro, the treatmentTMA have the effect which sicnificant to improvement of Alluminium alloy series 2104 fatigue strength. Generally entire process TMA improve of limit fatigue from specimen at condition early of limit fatigue 48.3 N / mm2 (48.3 MPA), mounting to become 50 until MPA, or mount 3.4 % until 44.9%. With the process of termomechanical aging TMA I, happened the increasing of cycle number equal to, 26.3 %, at treatment of TMA II go up equal to 62 % and 89.8% at process of TMA III, at maximal loading (180 Mpa).
Studi Kemampuan Tanaman Rumah dalam Penyerapan Panas Matahari untuk Mengatasi Panas Lokal Ahmad Syuhada; Dharma Dawood
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Energi matahari sangat dibutuhkan oleh seluruh makhluk hidup untuk berbagai macamkeperluan kehidupan. Pemakaian dengan jumlah yang tepat untuk setiap makhluk hidupmerupakan usaha untuk kelangsungan hidupnya. Tetapi apabila berlebihan akan sangatmengganggu kenyamanan thermal hidupnya. Banyaknya keluhan dari masyarakat yangmengatakan bahwa keadaan cuaca semakin panas khususnya di perkotaan, keadaan ini terjadiakibat tidak seimbangnya banyak bangunan dan jumlah tanaman yang ada sehingga penyerappanas radiasi yang dipancarkan matahari berkurang drastis. Untuk mengurangiketidaknyamanan thermal lokal di Banda Aceh dan sekitarnya dilakukan dengan caramemperbanyak pepohonan, dimulai dari lingkungan pekarangan rumah masing-masing, tamankota maupun taman-taman pekarangan rumah, sehingga akan tercipta kenyamanan thermal dilingkungan sekitarnya, karena fungsi tanaman adalah menguraikan karbondioksida menjadiOksigen serta menyerap panas matahari yang digunakan pada proses fotosintesis. Untukmemilih tanaman yang akan di tanam di pekarangan rumah supaya dapat mengurangi panas,diperlukan pengetahuan tentang kemampuannya tanaman dalam menyerap panas matahari.Karena itulah perlu kajian untuk mengetahui jenis tanaman yang paling banyak menyerappanas akibat radiasi matahari. Tanaman yang dikaji adalan tanaman yang biasa ditanam olehmasyarakat disekitar rumahnya seperti tanaman melinjo, jeruk nipis, mangga dan jambu.Manfaat yang diharapkan dari penelitian ini adalah dapat memberikan informasi bagimasyarakat khususnya di Banda Aceh tentang kemampuan masing-masing tanaman dalammenyerap panas untuk kenyamanan thermal di linkungan perumahan, dan tanaman mana yanglayak dan bagus untuk menjadikan suasana rumah sejuk dan nyaman terhadap panas.Kata kunci: panas, matahari, tanaman, kenyamanan termalSolar energy is needed by all living beings for various purposes of life. The use of the rightamount for every living being is an attempt for survival. But it would be very disturbing ifexcessive thermal comfort of his life. The number of complaints from people who say that theweather is getting hot, especially in urban areas, this situation occurs due to an imbalance ofmany buildings and the number of existing plants so that the heat absorbing radiation emittedby the sun is reduced drastically.To reduce the local thermal discomfort in Banda Aceh and itssurroundings is done by multiplying the trees, starting from the environment each home yard,city park and gardens, that will create thermal comfort in the surrounding environment, becausethe plant is to break the functions of carbon dioxide into oxygen and absorb solar heat used inthe process of photosynthesis.To choose of the plants types that will be planted in the homeyard in order to reduce the heat, the necessary knowledge of the plant's ability to absorb thesun's heat. It is needed the study of how to know the types of plants that absorb most of theheat due to solar radiation. Plants were assessed are plants that commonly grown by thepeople around her house like melinjo plants, lemon, mango and guava. The expected benefitsof this research is to provide information for people, especially in Banda Aceh on the ability ofeach plant to absorb heat for thermal comfort in residential environments and plants which areworthy and good to make the house cool and comfortable atmosphere to heat.Keywords: heat, sun, plants, thermal comfort
Prediksi Kurva P-h dan Nilai Kekerasan pada Indentasi Bulat Berbasis Pendekatan Tegangan Representatif (?r) I Nyoman Budiarsa
Jurnal Energi Dan Manufaktur Vol 9 No 1 (2016): April 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Dalam penelitian ini model elemen hingga untuk indentasi bulat (Spherical) telah dikembangkan dan divalidasi. Sebuahpendekatan untuk memprediksi kurva P-h dari sifat material konstitutif telah dikembangkan dan diuji berdasarkanhubungan antara kelengkungan dan sifat-sifat material dan stres representatif (?r) Hubungan antara parameterkonstitutif material (di tetapkan sebagai yield stress (?y) dan koefisien pengerasan regang (n)) bahan elastis-plastik,kurva P-h (kurva tegangan-kedalaman indentasi) dan kekerasan (hardness) pada indentasi bulat telah diselidiki secarasistematis dengan menggabungkan analisis tegangan representatif dan pemodelan elemen hingga (Finite Elemen)menggunakan baja. Parametrik Finite elemen model indentasi bulat (Spherical) telah dikembangkan sebagai rangesimulasi. Dua pendekatan baru untuk mengkarakterisasi kurva P-h untuk indentasi bulat (Spherical) telahdikembangkan dan dievaluasi. Melalui pendekatan fitting kurva penuh dan pendekatan kedalaman indentasi(indentation depth). Kedua pendekatan tersebut terbukti memadai/efektif dalam memprediksi kurva P-h indentasibahan. Konsep dan metodologi yang dikembangkan kemudian digunakan untuk memprediksi nilai kekerasan (HRB)Rockwell B hardness melalui analisis langsung dan divalidasi dengan data eksperimen pada sampel yang dipilih daribajaKata kunci: Indentasi Bulat, stres representatif, koefisien pengerasan regang, Kurva P-h, HRBAbstract:In this work, the finite element model of spherical indentation has been developed and validated. An approach to predictthe P-h curve of the material constitutive properties have been developed and evaluated based on the relationshipsbetween curvature and material properties and representative stress (?r). The relationships between constitutiveparameters of the material (in the set as the yield stress (?y) and strain hardening coefficient (n) ) of elastic-plasticmaterial, P-h curve (Force-indentation depth curve) and hardness in the spherical indentation has been investigatedsystematically by combining the representative stress analysis and finite element modeling using steel. ParametricFinite element model of spherical indentation has developed a range of simulation. Two new approaches to characterizethe P-h curve for spherical indentation has been developed and evaluated. One is the full curve fitting approach whilethe other is depth indentation base approach. Both approaches proved to be adequate / effective in predicting theindentation P-h curve material. The Concepts and methodology developed is to be used to predict the value of hardness(HRB) Rockwell B hardness through direct analysis and validated with experimental data on selected samples of steel.Keywords: Spherical Indentation, representative stress, strain hardening coeff., P-h curve, HRB
Pengaruh Jumlah dan Posisi Pemasangan Guide Vanes Pada Elbow Ducting Terhadap Besarnya Pressure Drop A.A.N.B Mulawarman; I Gusti Bagus Wijaya Kusuma
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Duct system is connecting between the refrigeration system and room to be conditioned. Room airstreamed into the cooling coil through the return duct intake, air filters. Furthermore, the air sucked by theblower, which flowed into the evaporator. Through the register box, air conditioned which has flowed backinto the room. When flowing inside the duct, the air has obstacle. One inhibiting factor is the change indirection of flow due to bends. That occurs at elbow is caused by friction (friction loss) and flow separation(separation loss). The aims of this research is to examine the phenomenon of the flow with Re = 3824 x104 on a rectangular elbow as well as knowing how to influence the guide vanes at the elbow ductingchannels. Based on data from research results, the number of guide vanes and position affects thepressure drop. From the graph shows that the installation of guide vanes to reduce pressure drop whenfluid flows through the elbow. Installation guide vanes with the number five result in the smallest pressuredrop of 9.1%. Efficiency caused by the installation of guide vanes reached 27.6%. Can be concluded thatthe installation of guide vanes on the elbow can be used as a reference in the design of ducting so asreduce the energy consumption.
Machinability baja AISI 1040 pada proses bubut dengan variasi cutting speed dan feed rate AAIA Sri Komaladewi; DNK Putra Negara
Jurnal Energi Dan Manufaktur Vol 1, No.2 Desember 2006
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

In order to obtain desired results of machining process (turning), parameter of process and material characteristic to be machined should be well known. This is due to different machining conditions and material yield different material machinability as well. It is needed to investigate of material machinability (AISI 1040) such as force, power and shear angle under different cutting speed (80, 160 and 240 m/min) and feed rate (0.1, 0.2, and 0.3 mm/rev). The results of investigation show that; at the same cutting speed the higher feed rate the higher cutting force needed; the higher cutting speed and feed rate, the higher power needed; at feed rate 0.1 mm./rev and 0.3 mm/rev, the higher cutting speed the shear angles has a trend to incline; at feed rate 0.2 mm/rev, cutting speed from 80 to 160 m/min yield increasing of shear angle, however, from 160 to 240 m/min shear angle declines.

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