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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 WAKTU PELAPISAN NIKEL PADA TEMBAGA DALAM PELAPISAN KHROM DEKORATIF TERHADAP TINGKAT KECERAHAN DAN KETEBALAN LAPISAN I Ketut Suarsana
Jurnal Energi Dan Manufaktur Vol 3, No.1 Juni 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Elektroplating merupakan suatu proses pengendapan elektro lapisan logam pada elektrode yang bertujuan membentuk permukaan dengan sifat atau dimensi yang berbeda dengan logam dasarnya. Logam yang dilapisi adalah tembaga karena mudah dibentuk menjadi perhiasan, alat industri, bagian kendaraan bermotor dan lain sebagainya. Logam pelapis yang digunakan dalam pelapisan khrom dekoratif ini adalah nikel dan khrom. Penelitian ini menggunakan spesimen berupa tembaga yang berjumlah 15 buah dengan panjang 60 mm dan diameter 14 mm. Dalam pelaksanaan pelapisan pertama menggunakan voltase 5 volt, temperatur 60 0C dan dengan arus 50 ampere. Variasi dilakukan pada waktu pencelupan yaitu 5 menit, 10 menit, 15 menit, 20 menit dan 25 menit dengan tiga kali pengulangan. Sedang pada pelapisan kedua menggunakan voltase 5 volt, temperatur 50 0C, arus 50 ampere dan waktu pencelupan 2 menit. Hasil penelitian ini adalah dengan variasi waktu pelapisan nikel pada tembaga yang dilakukan (dengan range 5 menit-25 menit), nilai iluminasi cahayanya (tingkat kecerahannya) dan ketebalan lapisannya meningkat, yaitu pada waktu pelapisan nikel 5 menit nilai iluminasi cahayanya adalah 3297,027 lux dan ketebalannya adalah 14,1 µm hingga pada waktu pelapisan nikel 20 menit yaitu sebesar 8242,904 lux untuk iluminasi cahayanya dan hingga waktu pelapisan nikel 25 menit yaitu sebesar 55,77 µm untuk ketebalan lapisannya. Sedangkan untuk waktu pelapisan nikel 25 menit nilai iluminasi cahayanya menurun yaitu sebesar 6868,862 lux yang disebabkan karena banyak lubang pada permukaan lapisan.
Reduksi Suara Lengkingan pada Struktur Cakram dengan Beban Gesek melalui Penambahan Massa Muchlisinalahuddin Muchlisinalahuddin; Meifal Rusli; Mulyadi Bur
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Suara lengkingan (squeal noise) sering terjadi jika salah satu permukaan kontak logambergesekan dengan permukaan logam lainnya padakondisi tertentu. Dalam banyakpengamatan, spektrum frekuensi yang dihasilkan didominasi oleh sejumlah puncak yangsangat tajam biasanya dalam rentang frekuensi 1-20 kHz, sering berupa bentuk frekuensitunggal. Tulisan ini difokuskan pada modifikasi struktur untuk mengurangi suara lengkinganyaitu dengan menambahkan massa pada struktur bebentuk cakram sebagai pemodelan daribentuk sederhana dari roda kereta api. Beberapa massa ditambahkan pada struktur cakramuntuk mencegah getaran yang tidak stabil akibat gesekan dan untuk untuk mengurangi suaralengkingan. Dalam penelitian sebelumnya ditemukan bahwa penambahan massa untukstruktur dengan gesekan yang menyebabkan suara lengkingan dapat diterapkan untukmenggeser atau mengurangi wilayah yang tidak stabil dari modus terkopel. dengan caramenghilangkan daerah tak stabil dari kondisi kerja. Pada penelitian ini, penambahan dua,empat dan delapan massa tambahan dengan berbagai ukuran ditambahkan di tepi cakram,dimana amplitudo getarannya lebih tinggi dibandingkan diposisi lainnya. Sehingga didapatkanbahwa dengan menambahkan delapan massa tambahan ditepi cakram suara lengkingan dapatdihilangkan, terutama dengan penambahan massa 50 gram dapat menghilangkan suaralengkingan dan dapat menggeser frekuensi pribadi menjadi 2114 Hz.Kata Kunci : suara lengkingan, modus terkopel, peredam dinamik,penambahan massaSqueal noise often occurs when a contact surfaces of metal rubbing against another metalsurface under certain conditions. In many observations, the frequency spectrum is dominatedby a number of very sharp peaks typically in the frequency range 1-20 kHz, often in singlefrequency form. This paper is focused on structural modifications to reduce the squeal noise byadding a mass in a simple thin disc as a simple model of train wheel where squeal noise isfrequently found when the train moves at curve track. Some masses are added to the disc toprevent unstable vibration caused friction and reduce the squeal noise. In previous study it isfound that the addition of mass to the structure with friction that causes the squeal noise canbe applied to shift or reduce unstable region of coupled mode. It works by removing theunstable region of the operating conditions. In this case two, four and eight lump masses withvarious mass is added to the edge of the disc where the vibration amplitude relatively higherthan other position. It is found that by adding eight-lump masses to thin disc the squeal noisecan be eliminated, especially by the addition 50 grams of the mass can eliminate the squealnoise, and shift the natural frequency to 2114 Hz.Keywords: squeal noise, coupled mode, additional mass
Pembuatan Etanol Generasi Kedua Dengan Memanfaatkan Limbah Rumput Laut Eucheuma Cottonii Sebagai Bahan Baku I Gede Wiratmaja; I Gusti Bagus Wijaya Kusuma; I Nyoman Suprapta Winaya
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Dissociation energy of diatomic crisis happened in various states in the existing world cleavage has entered areal serious step and concerns so that must soon is searched its the problem solving method, including Indonesia. Source ofpotential feedstock which its the availability is abundance, economy-priced, has not many exploited by people and containssimple sugar sewer structures which can be turned into ethanol is lignocellulosic material which in a few last decade,becomes one of interesting research object to know potency from material - lignocellulose material in producing ethanol.One of water territory commodity of a real Indonesia potency to be developed is sea grass Eucheuma cottonii and rest ofyield cottonii which is not is exploited able to exploited returns to to become one of making feedstock of substitution ethanolof feedstock which during the time is applied like distance, cassava and sugar cane. In this research, approach gone throughin the form of assaying method of direct is field. Assaying is done by comparing various raffle ratio cottonii with yeast atfermentation process with various fermentation time and various delignification to look for comparison of ethanol puritygrade, ethanol volume and fermentation speed by using measuring instrument which so called vinometer.Result fromresearch done with method is upper obtained result as follows : At delignification NaOH 15% and with comparison (1:0,006) for raffle cottonii and yeast is obtained by purity grade, best ethanol volume and fermentation speed. Where highestethanol grade got from treatment biologically that is equal to 15,5% and in physicist equal to 14,8% on day 6 offermentation. So do with ethanol volume yielded is higher where maximum volume capable to be yielded is 245 ml atbiological treatment and 234 ml at physical treatment on day 9of fermentation. Meanwhile highest fermentation speedcapable to be yielded is 0,058 kg/day at physical treatment, and 0,063 kg/day at biological treatment on day 3offermentation so that as a whole ethanol purity grade, ethanol volume and fermentation speed yielded with treatmentbiologically gives higher level result if it is compared to ethanol grade yielded from treatment in physicist.
The effect of work piece velocity and depth of cut on the performance of grinding process using alumina-En9 DNK Putra Negara; IGN Priambadi; I Ketut Suarsana
Jurnal Energi Dan Manufaktur Vol 1, No 1 Juni 2006
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Grinding is a very complex machining process due to many parameters to be considered. In this research, the effect of workpiece velocity and depth of cut toward performent of grinding such as actual depth of cut, force, power and specific energy to be investigated. Grinding process to be applyed is straight surface grinding with alumina and En9 as grinding wheel and workpiece respectivelly. Two independent variables to be condisioned, there are workpiece velocities ( 0,1, 0,2, and 0,3 m/s) and setting depth of cut (10, 20, 30, 40 and 50?m. The data obtained is evaluated by plooting into grapht. The results of experiment show that the higher depth of cut, the higher actual depth of cut obtained, however, the higher worcpice velocity, the lower depth of cut obtained; depth of cut and workpiece velocity are proportional to force, power and volume rate of metal removal; and specific energy is proportional to depth of cut but it is opposite to vorkpiece velocity.
Analisis Profesionalisme Lulusan Program Studi Teknik Mesin Politeknik Negeri Bali Yang Bekerja Pada Industri Made Anom Santiana; M. Yusuf M. Yusuf
Jurnal Energi Dan Manufaktur Vol 7 No 1 (2014): April 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstra k: Politeknik sebagai lembaga pendidikan di bidang vokasi telah melakukan langkah-langkah yangsangat tepat sebagai bentuk tanggungjawab terhadap penyediaan tenaga kerja yang terampil danprofesional di industri. Hingga saat ini belum ada penelitian tentang tingkat profesioanlisme alumniPoliteknik Negeri Bali, sehingga dipandang perlu melakukan penelitian sebagai langkah awal untukmengetahui dan meningkatkan profesionalisme lulusan PNB. Penelitian ini adalah penelitianexpost facto yang dengan jumlah responden 30 alumni Prodi Teknik Mesin yang telah bekerjaditambah dengan 13 responden yang merupakan atasan alumni di instansi tempat alumni bekerja.Hasil penelitian menyatakan bahwa: (a) Alumni prodi Teknik Mesin Politeknik Negeri Bali tergolongpada tingkat profesional dalam bekerja. (b) Hubungan antara prestasi akademik dan pengalamankerja dengan profesionalisme alumni bidang teknologi Politeknik Negeri Bali adalah sangat lemah(r = 0,069), secara perhitungan statistik, prestasi akademik dan pengalaman kerja hanyamemberikan pengaruh 0,5% terhadap profesionalisme alumni. (c) Tidak ada perbedaan yangsignifikan antara alumni Prodi Teknik Mesin yang mendapat pelatihan kerja dengan alumni yangtidak mendapat pelatihan kerja terhadap profesionalisme kerja mereka. (d) Diprediksi bahwakategori profesional dari para alumni Prodi Teknik Mesin Politeknik Negeri Bali dalam bekerjaadalah karena dipengaruhi oleh suasana akademik ketika kuliah. Berdasarkan temuan-temuanpada hasil penelitian disarankan kepada pemberi kebijakan di Politeknik Negeri Bali ataupunlembaga pendidikan vokasional lainnya hendaknya lebih memperhatikan dan meningkatkansuasana akademik yang kondusif dalam mencetak tenaga handal dan profesional.Kata kunci: Profesionalisme, alumni bidang teknologiAbstract :Polytechnic as an institution in the field of vocational education has made appropriate decision as aform of responsibility for the provision of skilled labor and professionals in the industry. Until nowthere has been no research on the level professionalism of Bali State Polytechnic (PNB) Alumni,so it is necessary to do research as a first step to determine and improve the professionalism ofgraduates PNB. This research is ex post facto that the number of respondents 30 alumni of TheDepartment of Mechanical Engineering who has worked plus 13 respondents who are thesupervisor of the alumni in the place of work. The study states that: (a) the department ofMechanical Engineering Alumni Bali State Polytechnic belonging to the professional level in work.(B) The relationship between academic achievement and work experience with the alumniprofessionalism Bali State Polytechnic technology field is very weak (r = 0.069), in the calculation ofstatistics, academic achievements and work experience only a 0.5% impact on the professionalismof the alumni. (C) There is no significant difference between the alumni of Department ofMechanical Engineering who received job training with alumni who did not receive job training inthe professionalism of their work. (D) It is predicted that the professional category of the alumni ofDepartment of Mechanical Engineering Bali State Polytechnic in the works is because it isinfluenced by the academic atmosphere when during study. Based on the findings of the research itis suggested to provide in Bali State Polytechnic or other vocational education institutions shouldpay more attention and enhance a conducive academic atmosphere in print reliable andprofessionalpersonnel.Keywords: Professionalism, alumni of the field of technology
Balance of Transient Thermal Energy on the Forced Flow Rotary dryer Made Ricki Murti
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

There have been many studies about the dryer with a static bed so dry material produced is not uniform. Thus, drying withrotating bed can produce the dry material uniformly. Usually a prototype closest to the efficiency of the system as aperformance, but it has not been able to show its thermal energy balance. So the target of this research is a transient thermalenergy balance. Data taken in the testing include: the temperature inlet fluid of drying chamber channel (Tin), the velocity offluid flow into drying chamber channel (V), the outlet fluid temperature from drying chamber channel (Tout), the temperatureof dried material (Tmtl), the mass of dried material (mmtl), the surface temperature in the drying chamber wall (Tdlm), surfacetemperature out the drying chamber wall (Tluar). Next step is to get the results of data processing in the form of transientthermal energy balance in tables and graphs. From the results it can be seen that the useful energy decreases with timealthough the incoming energy drying system increased slightly. From the energy balance of thermal performance is obtainedalso in the form of thermal efficiency and average thermal efficiency is 18%. Decrease in useful energy as a function of time,causes the thermal efficiency as a function of time was also decreased, it is characterized by a decrease in the mass ofmaterial because the condition is getting dry.
Pengaruh Temperatur Sinter Terhadap Kekerasan dan Keausan Kampas Rem Berbasis Komposit Hibrida Serbuk Tempurung Kelapa/Alumina/Phenolic Resin I.D.G Ary Subagia; IK Adi atmika; NPG Suardana; Robby GDS; Steven FS
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 (1004.211 KB) | DOI: 10.24843/JEM.2018.v11.i02.p02

Abstract

Penelitian ini menginvestigasi sifat kekerasan dan keausan kampas rem komposit hibrida. Komposit hibrida berbasis penguat adalah serbuk tempurung Kelapa dan alumina dengan matriks phenolic resin. Benda uji diproduksi menggunakan hot press pada temperatur sinter bervariasi dari 200oC, 250oC dan 300oC. Tujuan penelitian adalah menentukan tingkat kekerasan, laju keausan dan koefisien gesek dari komposit hibrida. Pengujian dilakukan dengan menggunakan pin-on-disk dan Vikers berdasarkan standar masing-masing ASTM E-92 dan ASTMG99-95a. Hasil pengujian ditunjukkan temperatur sinter telah signifikan menurunkan koefisien gesekan, walaupun pada benda uji A dengan temperatur sinter 200oC masih lebih tinggi dari benda uji control sebesar 3.54%. Kemudian, nilai kekerasan HV untuk komposit hibrida pada temperatur sinter 300oC adalah 9.3% lebih tinggi dari pada kontrol. Kesimpulan adalah komposit hibrida dengan komposisi 40% serbuk tempurung kelapa dan 20% alumina potensial diaplikasikan untuk bahan alternatif kampas rem kendaraan bermotor. This research investigates the hardness and wear behavior of hybrid composite brake pad. Hybrid composite was manufactured base on particles coconut cell and alumina reinforced and phenolic resin matrix. The specimens were produced by using the hot press according to temperatures variation of 200oC, 250oC and 300oC. The research purpose to determine hardness ability, wear rate, and friction coefficient of hybrid composites. Pin-on-disk and Vickers test have been employed according to the ASTM E-92 dan ASTMG99-95a, respectively. The result shows that sintering temperature have been significant decreased friction coefficient, while on specimen A with 200oC sinter temperature has 3.54% higher than control specimen. In addition, the hardness (HV) number of hybrid composite on 300oC sinter temperatures has 9.3% higher than control. Conclusion, hybrid composite with composition 40% coconut cell particles and 20% alumina has potential as alternative material of the vehicle brake pad application.
Efek Tegangan Listrik dan Waktu Proses Elektroplating Krom Keras terhadap Tebal Lapisan Ketut Suarsana; I M. Astika; D.N.K Putra Negara
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 (540.316 KB) | DOI: 10.24843/JEM.2019.v12.i02.p05

Abstract

Proses pelapisan krom keras merupakan proses akhir atau tahap penyelesaian pada kebanyakan pembuatan komponen agar tidak cepat aus, seperti pada poros, pasak, ring piston, silinder, bearing dan crank shaf. Dalam bidang industri sifat mekanik yang banyak diperlukan pada logam yang dipergunakan adalah kemampuannya untuk tahan aus dan tahan korosi yang mana kita ketahui logam mempunyai reaksi yang sangat aktif terhadap perubahaan temperatur dan cuaca, maka perlu dilakukan pelapisan sehingga kemungkinan suatu bahan logam terkena korosi bisa dihambat. Bahan spesimen yang di gunakan adalah Baja St 60 (C 0.40%; Mn 7%; Si 0.28%; P+S 0.09%; Fe 98,53%) dengan variasi tegangan listrik: 4, 6, dan 8 volt, untuk variasi waktu elektroplating krom keras 30, 45, dan 60 menit. Pengujian yang dilakukan dengan pengukuran ketebalan lapisan menggunakan skala foto mikro dan menghitung ketebalan lapisan permukaan. Hasil penelitian menunjukkan bahwa semakin tinggi tegangan listrik yang digunakan dan semakin lama waktu proses pelapisan krom keras maka meningkat ketebalan lapisannya. Ketebalan lapisan permukaan yang paling tebal didapatkan pada tegangan 8 volt dengan waktu pelapisan 60 menit dengan ketebalan lapisannya sebesar 89,37 ?m, sedangkan ketebalan lapisan permukaan tipis didapat pada tegangan 4 volt dengan waktu pelapisan 30 menit ketebalan lapisannya sebesar 20,18 ?m. Jadi tegangan listrik dan waktu electroplating dapat mempengaruhi dan memberikan efek terhadap ketebalan lapisan yang terjadi pada Baja St.60. The hard chrome coating process is the final process or completion stage in most parts making so as not to wear out quickly, such as on the shaft, pegs, piston rings, cylinders, bearings and crank shafts. In the industrial field of mechanical properties that are much needed in the metal used is its ability to withstand wear and corrosion resistance which we know metals have a very active reaction to changes in temperature and weather, coating is necessary so that the possibility of a metal being corroded can be inhibited. The specimens used were Baja St 60 (C 0.40%; Mn 7%; Si 0.28%; P + S 0.09%; Fe 98.53%) with variations in electrical voltage: 4, 6 and 8 volts, for time variations hard chrome electroplating 30, 60 and 90 minutes. Tests carried out by measuring the thickness of the layer use a micro photo scale and calculate the thickness of the surface layer. The results showed that the higher the voltage used and the longer the coating process was hard chrome, the thickness of the layer increased. The thickest surface layer thickness was obtained at 8 volts with a coating time of 60 minutes with a layer thickness of 89.37 ?m, while the thickness of the thin surface layer was obtained at a voltage of 4 volts with a coating time of 30 minutes layer thickness of 20.18 ?m. So the electrical voltage and time of electroplating can affect and give effect to the thickness of the coating that occurs in Steel St.60
Effect of Fiber Volume Fraction and Water Absorption toward Bending Strength of Coconut Filters/ Polyester Composite I Putu Lokantara; Ngakan Putu Gede Suardana; I Made Gatot Karohika
Jurnal Energi Dan Manufaktur Vol 3, No.2 Oktober 2009
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The variation of fibre volume and the duration of water soaking take influence on the mechanical properties of composite. This research aim is to know the influence of fraction volume fibre and soaking duration on the mineral watertoward the tensile strength and flexural of polyester-coconut-tapis composite. This research used coconut-tapis fibre which is cut 1 cm in length with 0%, 5%, 7,5%, and 10% fiber volume fraction, unsaturated-polyester (UPRs) matrix resin type Yucalac 157 BQTN-EX, and MEKPO hardener. The flexure specimen are made by press hand lay-up method and cut according ASTM D790-03 for the flexure test. The result of flexure test shows that the duration of soaking and the fiber volume fraction give a significant effect on the flexural strength of composite. The highest strength are reached by composite with 10% fibre volume on 48 hour soaking time equal to 41.994 MPa. The flexure modulus happenend shows increasing until 24 hour soaking time. The highest modulus are reached by composite with 10% fibre volume equal to 7.114 GPa while the lowest are reached by composite with 0% fibre volume equal to 3,023 GPa.
Pengaruh variasi jarak antar ring berbentuk segi empat pada permukaan silinder terhadap koefisien drag Si Putu Gede Gunawan Tista; I Made Astika; Ainul Ghurri
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 aplikasi engineering banyak ditemukan peralatan yang menggunakan silinder seperti tiang penyangga jembatan,cerobong asap, tiang pancang pengeboran minyak lepas pantai dan sebagainya. Peralatan-peralatan tersebutmengalami hembusan udara setiap saat, yang menyebabkan kekuatan konstruksinya berkurang, akibat adanya drag.Tujuan dari penelitian ini adalah untuk mengetahui pengaruh variasi jarak antar ring berbentuk segi empat padapermukaan silinder terhadap koefisien drag. Penelitian ini dilakukan pada wind tunnel (lorong udara) yang terdiri dariblower (untuk menghembuskan udara), pipa pitot, U tube manometer, inclined manometer, neraca digital, silinderdengan ring segi empat. Pada penelitian ini, dilakukan dengan memvariasikan Jarak antar ring yaitu 30 mm, 40 mm, 50mm, 60 mm dan 70 mm. Silinder diletakkan vertikal dalam wind tunnel dengan diameter D = 60 mm. Gaya dragdiperoleh dengan menggunakan neraca digital yang mencatat besarnya massa, kemudian dikalikan dengan percepatangravitasi. Distribusi tekanan diperoleh dengan mengukur tekanan pada permukaan silinder menggunakan inclinedmanometer pada 36 titik dengan interval 10o. Hasil penelitian menunjukkan semakin besar jarak antar ring koefisiendrag semakin besar. Koefisien Drag terendah terjadi pada jarak antar ring L = 30 mm atau L/D = 0.50, besarnya CD =0,606352. Besarnya penurunan drag dibandingkan tanpa ring adalah 29,3 %.Kata kunci: Silinder, ring segi empat, jarak antar ring, koefisien dragAbstract:In many engineering applications there are many types of equipment that use cylinders, such as smoke chimney, bridgesupport column, etc. The equipment is undergoing drag due to the airflow that flows through it. The existence of the dragwill reduce its lifetime. One of the efforts to reduce drag is to create a rectangular ring on the surface of the cylinder. Thepurpose of this study was to determine the effect of variations in the distance between the ring of a rectangular ring onthe cylinder surface on the drag coefficient.This research was conducted in wind tunnel which consists of a blower (forblowing air), pitot pipe, U-tube manometer, inclined manometer, digital balance, cylinder with a rectangular ring. Theresearch was carried out by varying the distance between the ring i.e. 30 mm, 40 mm, 50 mm, 60 mm and 70 mm,respectively. The cylinder is placed in a vertical wind tunnel with a diameter D = 60 mm. The drag force is obtained byusing a digital balance that records the amount of mass, and then multiplied by the acceleration due to gravity. Thepressure distribution is obtained by measuring the pressure in the cylinder surface using inclined manometer on 36points with 10o intervals. The results showed that the greater the distance between the rings increased the dragcoefficient. The lowest drag coefficient was achieved at rhe distance between ring L = 30 mm or L/D = 0.50, with the CDvalue = 0.606352; that is equivalent to 29.3% drag reduction.Keywords: Cylinder, rectangular ring, space between ring, drag coefficient 

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