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Study on Pressure Distribution in the Blade Passage of the Francis Turbine Sutikno, Djoko; Soenoko, Rudy; Pratikto, Pratikto; PT, Fery Putra; Nur Cahyo, Ponco Muchamad
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Pressure distribution along a series of guide and runner blade passages of the Francis turbine are useful to be known in order to predict flowing water pressure through the passages whether the pressure under the vapor pressure or not. Furthermore, when at any section of the passages the water pressure under the vapor pressure a cavitations will occur. In this study, the pressure of flowing water throughout the blade passages were measured at four sections along the passages by using four mercury deflection manometers and conditions of the flowing water were recorded by using a stroboscope and camera. The turbine was operated at 5 different heads with the same guide blade openings. Water pressures at the inlet and outlet turbine were measured by a Bourdon manometer of each. The flow rates were measured by using an orifice plate equipped with a mercury deep well manometer. The forces were measured by using a prony brake and turbine rotations were detected by using a digital tachometer. The result of the research state that head drop on the guide and runner blades, and turbine efficiency changing as the head, flow rate and turbine speed changed. The head drop on the runner was greater than that on the guide blade. Cavitations were not occoured because the lower pressure along the passages were still higher than vapor pressure. Water pressure decreased from the guide blade inlet to the runner outlet. Keywords : Francis turbine, Pressure distribution, guide and runner passages, head drop, cavitations, efficiency.
Kekuatan Tarik Dan Porositas Silinder Al-Mg-Si Hasil Die Casting Dengan Variasi Tekanan Irawan, Yudy Surya; Oerbandono, Tjuk; Agus Aristiyono, Dian Fitria; Pratikto, Pratikto
Jurnal Rekayasa Mesin Vol 4, No 1 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Tensile strength and porosity of die-casted Aluminum Alloys Al-Mg-Si with various applied pressure were investigated. Al-Mg-Si was melt in the electric induction crucible with temperature of 850 degree Celsius. Melt aluminum was poured in the metallic mould that pre-heated in 150 degree Celsius. Melt aluminum was pressed by the plunger with pressure of 0.1, 10, 30, and 50 MPa and held for 5 minutes. After aluminum was solidified, specimens for tensile strength and porosity test were machined. Tensile strength, porosity test and microstructure observation were conducted. Results of tensile strength and porosity test show that the higher plunger pressure, porosity becomes lower and tensile strength of specimens to be higher. Maximum tensile strength occurs in the specimens that pressed in 50 MPa. It occurs due to minimum porosity and small grains of microstructure in the specimens.Keywords : Aluminum, Die casting, Pressure, Tensile Strength, Porosity, Microstructure
Analisis Penerapan Metode RCM Dan MVSM Untuk Meningkatkan Keandalan Pada Sistem Maintenance (Studi Kasus PG. X) Lukodono, Rio Prasetyo; Pratikto, Pratikto; Soenoko, Rudy
Rekayasa Mesin Vol 4, No 1 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Maintenance system on milling season is using of preventive and corrective maintenance program. However, implementation of the program is still not guided with adequate SOP (Standart Operation Procedure) especially on a specific areas. Downtime occurring during year 2012 on the season were of 241.83 hours. This impacts to loss of potential profits, labor costs, and production capacity. To cope the problem, the study proposes application of Maintenance Value Stream Mapping (MVSM) supported by Reliability Centered Maintenance method (RCM). RCM consists of FMEA, reliability analysis, and RCM Worksheet. For the reliability analysis this study uses easyfit 5.5 profesional, whereas for the MVSM describes actual activity of the maintenance. Based on the application and analysis, it is known there exist 3 machines that are in critical condition and they show having the highest downtime, namely : Unigrator, cane Carrier I, and Cane Carrier II. The result of this research are SOP for actual activity of maintenance, time interval of maintenance, and tipe of maintenance for the machines.Key Word: MVSM, RCM, SOP Maintenance, 5S, FMEA, RCM Worksheet
Pengaruh Temperatur pada Proses Hot Isostatic Pressing terhadap Porositas, Keausan dan Mikrostruktur Sludge Powder Duralumin Multazam, Ahmad; Suprapto, Wahyono; Pratikto, Pratikto
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Sludge is the starting raw material in the process of forming wheels with forging method. Performance wheels strongly influenced by the quality of sludge. Sludge should have physical properties that light , soft and easy strengthened. One material that can be used as materials for sludge are: duralumin material. Duralumin is another name for aluminum & copper alloy (Al / Cu) with a Cu content of about 4 %. Making sludge powder duralumin with powder metallurgical methods can improve the quality of sludge.Making the specimen begins to weigh 100 g of powder duralumin and enter into a mold that has been in the preheating (100 ° C). Wait about 10-15 minutes until the mold temperature reached (450 ° C), (475 ° C) , (500 ° C) , and (525 ° C). Perform (hot iso- static pressing) HIPing by using a hydraulic press machine at 50 MPa and kept constant for 30 minutes. After the specimens were removed from the mold. The results showed the higher temperature tends to result in a percentage sitering porosity and wear rate decreases. This is evidenced by the percentage of porosity at a temperature of 450 ° C , 475 ° C , 500 ° C , and 525 ° C is 1.193 ° C , 1:03 ° C , 0757 ° C and 0733 ° C. While the wear rate at the sintering temperature of 450 ° C , 475 ° C , 500 ° C , and 525 ° C is 0.00095 g / s , 0.00080 g / s , 0.00059 g / s , 0.00050 g / s. Then from the microstructural observations with 500x magnification SEM image shown that with increasing temperature HIPing likely to result looks smooth surface of the test specimen.Keywords: Powder Metallurgy, Temperature HIPing, Duralumin, Sludge, Porosity, Wear, Microstructure.
KESEIMBANGAN LINTASAN TIPE U- LINE ASSEMBLY PADA PERAKITAN POMPA AIR Pratikto, Pratikto; Octavia, Tanti
Jurnal Teknik Industri Vol 11, No 1 (2009): JUNE 2009
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (156.093 KB) | DOI: 10.9744/jti.11.1.pp. 43-50

Abstract

Many companies strive for minimizing imbalance work station as well as number of work stations. Besides, the work station’s precedence and space curb also have to be considered. So far, there exist many solutions on those quests. Two of those solutions are the straight line and the U-type line balancing. In this paper, we compare the straight line balancing to U-type line balancing using Mixed Integer Programming (MIP), particularly, for solving the assembly line of water pumps production. Additionally, we employed LINGO to solve the MIP model. The result shows that the U-type line gives a better solution than the straight line balancing in term of number of work station. Moreover, it also shows that U-type line balancing is more efficient than the straight line balancing, significantly. Abstract in Bahasa Indonesia: Saat ini, secara umum banyak perusahaan dihadapkan pada masalah meminimalkan beban kerja yang tidak seimbang dan jumlah stasiun kerja dengan batasan proses serta lokasi yang ada. Banyak penelitian yang telah dilakukan untuk menyelesaikan permasalahan di atas. Penelitian ini bertujuan untuk membandingkan keseimbangan lintasan straight line dan tipe U-line menggunakan model mixed integer programming pada suatu perakitan pompa air. Model mixed integer programming diselesaikan dengan menggunakan LINGO. Hasil penelitian menunjukkan tipe U-line memberikan hasil yang lebih baik dibandingkan straight line berdasarkan jumlah work station dan lebih efisien secara signifikan. Kata kunci: keseimbangan lintasan, keseimbangan lintasan tipe U-line, mixed integer programming
Rekayasa Sistem Informasi Manajemen Perakitan Berbasis Group Technology untuk Mendukung Proses Assembly Frame Body Bus Murdiyanto, Danang; Pratikto, Pratikto; Santoso, Purnomo Budi
Jurnal Rekayasa Mesin Vol 7, No 2 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (606.533 KB) | DOI: 10.21776/ub.jrm.2016.007.02.5

Abstract

PT. APW is a manufacturing company of the bus body. One of the production process department in PT. APW is frame work department. It is in charge of making the bus body frame. The problem faced in this department is inadequationvof the current system. It is because the work is done manually and is not by using computer applications with database systems. The study used the assembly information management system based on Group Technology to help its assignment of bus body frame assembling process and the work report. Management Information System Design Assembly (SIMPER) were performed by using the Microsoft Access 2013 to produce a prototype application SIMPER consisting of phase identification, analyzing, planning, designing, implementating and testing. By designing this SIMPER prototype application, it is expected to meet the needs of users of information systems in Production Manager, SPV and Admin employees.
Pengaruh Fraksi Volume Serat Kayu Gelam (Melaleuce Leucandendra) terhadap Kekuatan Tarik dan Impak Komposit Bermatrik Polyester Arief, Saifullah; Pratikto, Pratikto; Irawan, Yudy Surya
Jurnal Rekayasa Mesin Vol 7, No 3 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (505.667 KB) | DOI: 10.21776/ub.jrm.2016.007.03.3

Abstract

The purpose of this research is to find the effect of volume fraction variation of “gelam” bark fiber on tensile and impact strength of polyester composite. The filler material was the “gelam” bark fiber with volume variation ratio of 10%, 30 %, 50 % and 70 %. Alkalization of the “gelam” bark fiber used 5% of NaOH and 2 hours of soaking time. Mechanical testing was carried out by tensile and impact testing. The matrix for bonding the “gelam” bark fiber was polyester resin type 157 BTQN and 1% concentration of MEKPO catalyst. The mechanical properties are obtained from tensile and impact testing: The results of tensile testing; slowed the highest tensile strength of compositre with 70% of ‘gelam bark fiber was 15.623 MPa. The results of impact testing: obtained the highest impact strength in composete with 70 % percentage of ‘gelam’ bark fiber is24.772 J.
Pengembangan Sistem Kontrol Traksi Mobil Elektrik Berbasis Rekonstruksi Keadaan Kecepatan Model Roda Pratikto, Pratikto; Nazaruddin, Yul Yunazid; Leksono, Edi; Abidin, Zainal
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 1, No 2 (2010)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

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Abstract

In  this  paper  the  development  of  electric  vehicle  traction  control  based  on  state  of  speed  reconstruction  of vehicle model that has the same acceleration condition between tire and chassis is studied. Vehicle is accelerated if the friction force takes place between tire and road. However, the traction force decreases even tends to zero on slippery road and torque input produces a large slip. Evidently, tire slip can be reduced by decreasing the applied torque to the tire. So the basic principle of the proposed method here compares the real vehicle tire speed condition with the model to determine the torque in order to reduce the slip. Tire speed is controlled in order to follow the reference value that is calculated from the model. Tire torque input then can be controlled by applying the feedback that is obtained from the difference value of speed between model and real tire. Implementation of this method on a real vehicle shows that the control method effectively controls the tire speed of vehicle to follow the reference and reducing the slip. From the experiment the control  system performance in reducing slip has the result  of 9.8% for maximum overshoot, 3.1 second for rise time, and 8 second for settling time. 
Modus Pelunakan dan Pengerasan HAZ pada Manual GMAW Welded Joint Yurianto, Yurianto; Pratikto, Pratikto; Soenoko, Rudy; Suprapto, Wahyono
ROTASI Vol 21, No 2 (2019): VOLUME 21, NOMOR 2, APRIL 2019
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1261.768 KB) | DOI: 10.14710/rotasi.21.2.127-133

Abstract

Las manual gas metal arc welding banyak digunakan dalam industri manufaktur konvensional. Akhir proses pengelasan menghasilkan produk las yang diinginkan. Pada baja dengan tebal dan jenis yang sama, dan metode pengelasan yang sama tetapi operator berbeda menghasilkan kekuatan las yang berbeda. Keseragaman produk las antara satu dan operator lain dapat diperoleh dengan welding procedure specification. Namun prosedur ini tidak menjamin kekuatan sambungan sama meskipun operator berbeda. Kekuatan daerah terpengaruh panas tergantung pada parameter las yang digunakan seperti diameter elektroda; arus listrik; tegangan listrik, kecepatan pengelasan; logam tebal dan panas masuk. Selain itu, perlu dipertimbangkan unsur kimia baja yang dilas. Parameter pengelasan akan mempengaruhi dimensi daerah terpengaruh panas. Semakin lebar daerah terpengaruh panas akan menurunkan kekuatan sambungan las. Pernyataan masalah dalam penelitian ini adalah "bagaimana menurunkan dimensi daerah terpengaruh panas yang dipengaruhi oleh proses pembekuan logam las." State of the art dari penelitian ini adalah analisis pelunakan daerah terpengaruh panas dengan melibatkan pembekuan logam las. Tujuan dari penelitian ini adalah untuk mencari penyebab terjadinya pelunakan dalam daerah terpengaruh panas sambungan las gas metal arc welding manual. Hasil penelitian adalah kekerasan standard dan heat treated welded joint. Parameter perlakuan panas untuk mendapatkan kekerasan HAZ tertinggi.
PENJADWALAN PERAWATAN DENGAN METODE CAMPBELL DUDEL SMITH (CDS) UNTUK MENINGKATKAN PRODUKSI MESIN RECYCLE WASTE TEMBAKAU Anggara, Teuku; Pratikto, Pratikto; Sonief, Achmad As?ad
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.12

Abstract

The Campbell Dudek Smith (CDS) method is commonly used by large companies to help them make Flowshop schedules. The purpose of this study is to design a more effective maintenance scheduling sequence in order to increase the amount of production with the most efficient use of time without having to stop production and be able to calculate the productivity of the machine it self. Partial Productivity (PP) analysis is used to determine the level of machine productivity by proving Partial Productivity (PP) after is better than Partial Productivity (PP) before. This research was conducted at PT. X, one of the leading national companies in producing cigarette products such as SKT cigarettes, SKM and SPM. As a result, this study has performed calculations using the Campbell Dudek Smith (CDS) algorithm and calculates the productivity of each iteration using Partial Productivity (PP). The recommended improvement of the engine maintenance scheduling sequence is by applying the scheduling sequence to the 5th iteration, J2-J4-J3-J1-J5.