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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 Diameter Lubang Snifter-Valve Terhadap Peningkatan Tekanan Dalam Tabung Udara Pompa Hydram Made Sucipta; Made Suarda; I Nengah Suweden
Jurnal Energi Dan Manufaktur Vol 12 No 1 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (431.507 KB) | DOI: 10.24843/JEM.2019.v12.i01.p08

Abstract

Pompa hydram telah banyak diaplikasikan terutama di daerah pedesaan atau perbukitan dimana ketersediaan suplai energy listrik menjadi kendala. Pompa hydram adalah pompa mekanis yang memanfaatkan peningkatan tekanan (water hammer) yang terjadi akibat mekanisme penutupan katup limbah secara tiba-tiba. Untuk itu pada badan pompa hydram dipasang tabung udara untuk mengurangi denyutan aliran air hasil pemompaan. Dalam kurun waktu tertentu operasi pompa hydram, jumlah udara yang ada dalam tabung udara akan terus berkurang. Untuk menggantikan volume udara dalam tabung udara tersebut maka pompa hydram dilengkapi dengan katup penghirup udara (snifter-valve). Namun dalam implementasinya, katup ini hanya berupa lubang berdiameter 1 ÷ 2 mm pada jarak sekitar 2 cm di bawah katup tekan pada badan pompa hydram. Namun sampai saat ini belum ada acuan diameter lubang snifter-valve tersebut. Oleh sebab itu, pada penelitian ini diinvestigasi besarnya peningkatan tekanan yang terjadi dalam tabung udara pompa hydram. Pada penelitian ini pompa hydram dilengkapi dengan katup hirup dengan variasi diameter lubangnya yaitu 0,5, 1,0, 1,5, 2,0 dan 2,5 mm. Hasil penelitian menunjukkan bahwa pada model pompa hydram dengan pipa penggerak berdiameter 1¼ inchi yang diuji, peningkatan tekanan yang terjadi dalam tabung udara berkisar antara 0,4 sampai dengan 0,5 bar. Snifter-valve dengan lubang berdiameter 1,5 mm menghasilkan peningkatan tekanan water hammer tertinggi dalam tabung udara sehingga memberikan kerja tertinggi yang terjadi dalam pompa hydram. Hydraulic ram pumps have been implemented and installed mainly in hilly or remote area where they are facing public electrical supply problem. Hydraulic ram pumps are mechanical pumps that utilize the increased water hammer due to the sudden shutdown mechanism of the waste valve. Therefore, the hydraulic ram pump is equipped with air vessel to reduce the pulsation of the pumping water flow. Within a certain period of hydraulic ram pump operation, the amount of air present in the air vessel will continue to decrease. In order to replace the air volume in the air vessel, the hydraulic ram pump is equipped with a snifter-valve. However, in its implementation, this valve is only a hole with a diameter of 1 ÷ 2 mm at a distance of about 2 cm below the delivery valve on the body of the hydraulic ram pump. However, there has not been any reference for determining the diameter of the snifter-valve hole yet. Therefore, in this study, works carried out for investigating the magnitude of the increased pressure that occurs in the air vessel of hydram pump. In this study, a hydraulic ram pump equipped with a snifter-valve with various orifice diameters of 0.5, 1.0, 1.5, 2.0 and 2.5 mm. The results show that for the hydraulic ram pump model with 1¼ inch diameter of the drive pipe that tested, the incrising pressure in the air vessel is about 0.4 up to 0.5 bar. The snifter-valve with 1.5 mm orifice diameter generates the highest incrising pressure of water hammer pressure in the air vessel, therefore, it gives the maximum work in the hydraulic ram pump.
REKAYASA RANCANG BANGUN SISTEM PEMINDAHAN MATERIAL OTOMATIS DENGAN SISTEM ELEKTRO-PNEUMATIK Riccy Kurniawan
Jurnal Energi Dan Manufaktur Vol 3, No.1 Juni 2008
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.79 KB)

Abstract

Dalam bidang perindustrian sekarang ini diperlukan suatu peralatan yang dapat bekerja secara otomatis untuk meningkatkan produktivitas, mempersingkat waktu produksi, menurunkan biaya produksi dan meniadakan pekerjaan-pekerjaan rutin dan membosankan yang harus dilakukan manusia. Salah satu alternatif yang dapat bekerja otomatis yaitu dengan menggunakan sistem pemindah material otomatis. Pada makalah ini akan dipaparkan mengenai perancangan sistem pemindah material otomatis yang menggunakan Programmable Logic Controller (PLC) sebagai pengendali, elektro-pneumatik sebagai aktuator dan dioperasikan secara otomatis. Hasil rancangan menunjukkan bahwa sistem ini memuaskan dan membutuhkan waktu 20 detik untuk melakukan satu siklus proses.
Kajian Eksperimental Parameter Modal Massa Raket Tenis dengan Tumpuan Bebas-Bebas Deli Usman; Mulyadi Bur; Meifal Rusli
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Olahraga tenis merupakan olahraga yang menggunakan raket sebagai alat untuk memukulbola. Dalam permainan, raket akan mendapatkan gaya gangguan berupa gaya impak dari bolayang akan menimbulkan getaran dan menghasilkan frekuensi pribadi. Jika hal ini terjadi terusmenerus sehingga raket bekerja pada frekuensi pribadinya, maka akan memyebabkanterjadinya kegagalan pada struktur raket. Untuk itu dilakukan penelitian agar dapat mengetahuikarakteristik dan frekuensi pribadi pada struktur raket tenis. Dalam penelitian ini, dilakukanpengujian terhadap raket tenis merk Wilson dengan berat 320 gram dan panjang 697 mm yangdigantung vertikal dengan kondisi tumpuan bebas-bebas. Accelerometer ditempatkan pada 8titik berbeda dengan satu titik eksitasi. Kemudian dilakukan pengukuran respon denganmencatat grafik FRF yang disimpann dalam format *txt. Secara umum diperoleh hargafrekuensi pribadi terendah struktur untuk modus pertama, kedua, ketiga dan keempat berturutturut: 174.3 Hz, 498 Hz, 1014 Hz, 1448 Hz, dengan masing – masing rasio redaman strukturberturut-turut: 0,759%, 0,543% , 0,785% dan 2,65%. Untuk setiap titik pengujian mempunyairasio redaman yang berbeda. Kemudian juga diperoleh modus getar dari sistem tergantungbebas yaitu, modus pertama berupa grafik setengah gelombang, modus kedua, ketiga dankeempat berupa grafik satu gelombang membentuk satu puncak satu dan lembah, namuntinggi masing – masingnya berbeda.Kata kunci: raket tenis, frekuensi pribadi, rasio redamanTennis is sport that uses a racquet as a tool to hit the ball. During the game, the racquet will geta stylish disruption of the impact force of a ball that would cause vibration and produce naturalfrequency. If this happens continuously so that the racquet works on his natural frequency, itwill cause failure of the structure of the racket. It is conducted the study in order to investigatethe characteristics and structure of the natural frequency of tennis racquet. In this study, testingof brands Wilson tennis racquet was conducted with a weight of 320 grams and a length of 697mm which are suspended vertically with the support of the free-free condition. Theaccelerometer is placed at 8 points with one point of excitation. The response was measured byrecording in a FRF chart and saved in txt format. In general, the value obtained for thestructure of the lowest natural frequency mode of the first, second, third and fourth respectively:174.3 Hz, 498 Hz, 1014 Hz, 1448 Hz, with individual structural damping ratio, respectively:0759%, 0543%, 0785% and 2.65%. Each test point has a different damping ratios. Thenvibration mode also obtained from a system that hang freely, namely: the first mode half-waveform chart, the second mode, third and fourth in the form of a graph of the wave form of thepeaks and valleys one, however each value have different height.Keywords: tennis racquet, a private frequency, damping ratio
Simulasi dan Studi Eksperimen Defleksi Beam Bright Mild Steel Akibat Variasi Beban Horisontal Dewa Ngakan Ketut Putra Negara; Si Putu Gde Gunawan Tista
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Beam is a structural member whose cross-sectional dimensions are relatively smaller than its length. Beams play significantroles in many engineering applications, including buildings, bridges, automobiles, and airplane structures. Beams arecommonly subjected to transverse loading, which is a type of loading that creates bending in the beam. In designing of amachine component or structure, deflection has an important role to be considered. If deflection occurred exceeds limitallowed, it can affect serious hazard on machine elements or structure due to it can affect of component deviate from its mainfunction. In this research, material to be used was Bright Mild Steel (ASTM 1060), with specimen in the form of portal beam.Physical condition of beam was modeled use of BEAM3 2D. Variation of loads to be applied were W = 100, 150, 200, 250,300, 350, 400, 450, 500, and 550 gr and concentrated in the one of portal in vehorizontal direction. The result of simulationwas verificated by experimental data. Evaluation was carried out by statistical test (t-test). The result of simulation iscategorized to be good if the result of simulation is same with experimental data. The result of research shows thatloading has a significant effect on the deflection. The higher load affect the higher of deflection Modeling use of BEAM3 2Dgave good result of deflection. This is showed from t-test have done, where the result of simulation was same withexperimental data.
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.
Karakterisasi Serbuk Hasil Produksi Menggunakan Metode Atomisasi M. Halim Asiri
Jurnal Energi Dan Manufaktur Vol 7 No 1 (2014): April 2014
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (405.67 KB)

Abstract

Abstrak : Metalurgi serbuk (powder metallurgy),yaitu merupakan teknologi produksi logam dengan bahan dasar Aluminum dengan unsur lain Ti,Mn,Mg,Si,sebagai unsur penguat sebelum diproses pencairan terlebidahulu melakukan pengujian sifat mekanik antara lain uji struktur makro dan mikro kemudianuji kekerasan (hardness tes), uji kekuatan (tensile strength). Setelah selesai diadakan pengujian sifat-sifat mekanik terhadap logam dasar, maka proses selanjutnya mencairkan logam dasar denganmelalui dapur peleburan (fornaices) dengan temperature panas sekitar 1200 s/d 1350? dan titik cair logam aluminum 650?. Setelah mencair kemudian di holding time selama 20 menit selanjutnya pembuatan proses granulasi (pembutiran) dengan menggunakan sistim Atomisasi Air (water atomization) dengan menggunakan variasi tekanan penyemprotan sebesar 20 s/d 25 Psi, dengan debit 4 l/s,variasi waktu yg digunakan 6 s/d 8 detik. Hasil dari proses sistim metode Atomisasi ini kita dapatkan macam-macam karakteristik bentuk butiran mulai dari Mesh 8 (2360????m),mesh 16 (1180????m), mesh 30(600????m), mesh 50(300????????),mesh 100 (150????m),mesh 200 (75????m). Untuk mengetahui data-data ini melalui pengamatan dengan menggunakan mikroskop makro dan mikro.Selanjutnya bisa juga melakukan pengujian dengan menggunakan alat uji SEM dan X – Ray (XRD).Kata kunci: uji sifat – sifat mekanik, sifat bahan, komposisi kimia dan porositas (civitis)Abstract : Powder metallurgy (powder metallurgy), which is a production technology with basic materialsAluminum metal with other elements Ti, Mn, Mg, Si, as a reinforcement agent before beingprocessed casting prior testing of mechanical properties among others, macro and micro structuraltest then hardness test, test of strength. After completion of the testing of mechanical properties ofthe base metal, then the next process with the base metal melt through the furnace with atemperature of about 1200 s / d in 1350 and the melting point of aluminum is 650C. After melt laterwith holding time for 20 minutes further manufacture granulation process (granulation) using wateratomization system by using a spraying pressure variation at 20 s / d 25 Psi, with discharge 4 l / s,the time variation are 6 s / d 8 seconds. Results from the process system atomization method isobtained variety of characteristics of the form of granules ranging from Mesh 8 (2360 m), 16 mesh(1180 m), 30 mesh (600 m), mesh 50 (), 100 mesh (150 m), 200 mesh (75 m). To determine thesedata through observation using a microscope macro and mikro and perform testing using testequipment SEM and X - Ray (XRD).Keywords: Test mechanical properties, material properties, chemical composition and porosity(cavities)
Analisis Performansi Sistem Pendingin Ruangan Dikombinasikan dengan Water Heater I Gusti Agung Pramacakrayuda; Ida Bagus Adinugraha; Hendra Wijaksana; Nengah Suarnadwipa
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Pada umumnya AC Window digunakan untuk mengkondisikan udara ruangan agar berada pada kondisi udara yang diinginkan.Panas pada kondensor dapat dimanfaatkan untuk fungsi yang lain sehingga tidak ada panas yang terbuang percuma.Memodifikasi AC Window dengan penambahan tabung pemanas air bertujuan untuk memanfaatkan panas yang akan dibuangkondensor menuju lingkungan untuk memanaskan air.Tabung Pemanas dipasang pada Penelitian dilakukan dengan melihat pengaruh penambahan suatu tabung pemanas air terhadapCOP (Coefficient of Performance), laju pendinginan ruangan, serta laju pemanasan air dalam tabung pada AC Window.Dari hasil penelitian yang dilakukan, didapat hasil bahwa COP AC Window dengan penambahan tabung pemanas mengalamipenurunan sebesar 0,3369 kJ/s, serta penurunan pada laju pendinginan ruangan sebesar 0,002 kJ/s. sedangkan untuk lajupemanasan air pada tabung didapatkan sebesar 0,0688 kJ/s
Aplikasi Konsep Produksi Ramping untuk Memperbaiki Efisiensi Pengolahan Minyak Kelapa Sawit Adriansyah Adriansyah; Agus Sutanto; Berry Yuliandra
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 (552.071 KB) | DOI: 10.24843/JEM.2018.v11.i02.p01

Abstract

Manfaat dari penelitian ini adalah untuk menerapkan konsep produksi ramping (lean manufacturing) pada proses pengolahan minyak kelapa sawit sehingga pemborosan yang terjadi dapat diidentifikasi serta diminimasi. Identifikasi pemborosan dilakukan melalui pengamatan dan kuesioner. Hasil identifikasi dengan menggunakan kuesioner digunakan sebagai dasar untuk menentukan alat pemetaan VALSAT yang sesuai untuk digunakan dalam analisis. Identifikasi pemborosan dengan kuesioner menunjukkan bahwa stasiun yang banyak menghasilkan pemborosan adalah loading ramp dan sterilizer. Berdasarkan konsep produksi ramping, pemborosan pada pengolahan CPO berdasarkan urutan tertinggi adalah ini adalah aktivitas menunggu, diikuti oleh transportasi dan gerakan berlebih, proses yang tidak diinginkan dan kecacatan bahan baku. Berdasarkan Value Stream Mapping (VSM) kondisi saat ini diketahui bahwa total waktu pengolahan CPO adalah 32700 detik serta efisiensi pengolahan CPO sebesar 30,7%. Kapasitas pengolahan sebesar 40 ton TBS/jam dan operator berjumlah sebanyak 26 operator. Rancangan perbaikan yang diusulkan dapat menurunkan total waktu produksi menjadi 23472 detik sekaligus memperbaiki efisiensi pengolahan menjadi 35,6% dengan kapasitas olah menjadi 55 ton TBS/jam dan dengan pengurangan operator hingga 5 orang. The objective of this research is to implement the concept of lean manufacturing in the oil palm fruit processing, so the wastes that commonly occur can be identified and minimized. The identification method of wastes is done through the observations and questionnaires. The result of identification by questionnaires was applied to determine the appropriate VALSAT mapping tool used in analysis. Identification of waste by using questionnaires shows that the wasteful stations are loading ramp and sterilizer. Based on lean concept, the overall wastes occured in CPO processing are waiting with an highest average score,and then followed by excessive transportation and movements, unexpected processing and defects of the raw material. Based on Value Stream Mapping (VSM) of the current condition is known,that the total processing time of CPO is 32700 second with processing efficiency equal to 30,7%.The capacity is 40 tons of fresh fruit bunches per hour with 26 operators. The proposed improvement plan can reduce the total production time up to 23472 seconds while increasing processing efficiency to 35.6% with capacity to 55 tons of fresh fruit bunches per hour and with operator reduction up to 5 people.
Pengaruh Parameter Pemotongan Terhadap Kekasaran Permukaan Blok Head Pada Proses Frais I Gusti Komang Dwijana
Jurnal Energi Dan Manufaktur Vol 12 No 2 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (220.866 KB) | DOI: 10.24843/JEM.2019.v12.i02.p10

Abstract

Teknologi Mesin Frais sudah dikenal dan biasa digunakan dunia industri besar maupun industri kecil, mesin ini biasaya digunakan untuk meratakan permukaan benda atau melubangi benda, dengan penyayatan mengunakan pisau frais atau mata bor. Blok head sepeda motor biasanya jika digunakan bertahun lamanya akan mengalami deformasi atau pembengkokan pada permukaan, sehingga kompresi pada sepeda motor akan menjadi bocor. Untuk memperbaikinya salah satu mesin yang dapat digunakan adalah mesin frais, diratakan kembali permukaan blok head yang bengkok. Untuk proses pengefraisan disini variasi yang digunakan adalah putaran spindle 300 rpm, dengan gerak makan 10 mm/menit, 15 mm/menit, 20 mm/menit dan kedalaman potong 0,1 mm, 0,2 mm, 0,3 mm. Hasil dari pengujian menunjukan bahwa tingkat kekasaran hasil pengfraisan yang paling kecil ada pada gerak makan 10 mm/menit dan kedalam potong 0,1 mm hasil yang di dapat 1.098 ?m. Milling Machine Technology is well known and commonly used in the world of large and small industries, this machine is usually used to flatten the surface of objects or pierce objects, by cutting using a milling knife or drill bit. Motorcycle head block usually if used for many years will experience deformation or bending on the surface, so that the compression on the motorcycle will leak. To fix it, one of the machines that can be used is a milling machine, flattened back the curved head block surface. For the process of refining here variation used is 300 rpm spindle rotation, with feeding motion of 10 mm / min, 15 mm / min, 20 mm / min and a cut depth of 0.1 mm, 0.2 mm, 0,3 mm. The results of the test showed that the smallest level of roughness of the results of refining was at a feed motion of 10 mm / min and into a 0.1 mm cut the results were 1.098 ?m.
Study Experimental Distance to Pressure Coefficient Double Cylinders Positioned Alined Ketut Astawa; Sukadana -; Karnata -
Jurnal Energi Dan Manufaktur Vol 3, No.2 Oktober 2009
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Factors affecting of coefficient of pressure are fluid velocity, fluid density, fluid viscosity and geometry of surface which is pasted by fluid. This research is conducted by variation of some factors affecting value of pressure coefficient that are surface geometry including cylindrical shape and bluff body, and variation of free stream. The pressure to be measured is based by change of oil column length (r, mm) at incline manometer which is connected to pressure tap located on cylindrical surface. Pressure data collected based on three types of space tube variation, there are 1.2D, 1.7D, and 2.2D, and three types of cylindrical diameter variation there are 2”, 2.5” and 3”, and free stream is kept to be constant at 6 m/s. The results of research show that, the higher space tube affecting on the value and position of maximum pressure on the back cylindrical. Value and position of separation point is more to be back direction as increasing of free stream. Pressure drop happen on back cylindrical at high free stream.

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