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Mekanika: Majalah Ilmiah Mekanika
Published by Universitas Sebelas Maret
ISSN : 14127962     EISSN : 25793144     DOI : https://doi.org/10.20961/mekanika
Core Subject :
"Mekanika: Majalah Ilmiah Mekanika" is an open-access journal published by Mechanical Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret. Mekanika invites scholars, researchers and practioners who have interest in mechanical engineering to publish their articles and also provides forums for them to share their works and knowledge. Mekanika focuses on the area of materials engineering and science, design, energy, manufacturing and construction but is not limited to. Both English and Bahasa are accepted in this journal. Mekanika has two issues every year (March and September) and aims to publish more frequently in the future.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 5 Documents
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Search results for , issue "Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika" : 5 Documents clear
STUDI EKSPERIMENTAL PENGARUH VARIASI SUDUT BLADE ARC TERHADAP PERFORMA SAVONIUS HORIZONTAL AXIS WATER TURBINE TIPE L PADA ALIRAN DALAM PIPA Muhammad Ilham Nadhief; Syamsul Hadi; Dominicus Danardono Prija Tjahjana
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35402

Abstract

Air merupakan energi baru dan terbarukan pengganti energi fosil yang dapat digunakan untuk memenuhi kebutuhan listrik masa depan karena jumlahnya yang melimpah. Turbin air savonius horizontal axis water turbine (HAWT) mampu beroperasi pada kecepatan putar rendah sehinga cocok untuk pembangkit listrik tenaga air menggunakan metode rain water harvesting (RWH). Namun, turbin ini memiliki koefisien daya dan torsi yang rendah. Penelitian prototipe rotor turbin tipe U dengan variasi jumlah sudu, sudut kelengkungan telah dilakukan sebelumnya untuk meningkatkan kinerja turbin ini. Dalam makalah ini, dibahas proses perancangan dan pengujian terhadap sebuah prototipe rotor turbin tipe L dengan 3 variasi sudut blade arc. Variasi sudut blade arc yang diuji adalah 120o, 135o dan 150o. Melalui penelitian ini, diketahui tipe turbin yang optimal jika dianalisa dari power output, TSR, dan power coefficient yang dihasilkan oleh turbin. Turbin tipe L dengan sudut blade arc 135o memiliki power coefficient paling tinggi sebesar 27% dengan TSR sebesar 1,320 dibandingkan turbin dengan sudut blade arc 120o dan 150o.
DIAGNOSIS KETIDAKLURUSAN (MISALIGNMENT) POROS MENGGUNAKAN METODE MULTICLASS SUPPORT VECTOR MACHINE (SVM) Wanto Wanto; R. Lulus. G. H.; Didik Djoko Susilo
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35403

Abstract

Misalignment is a condition where the centerlines of two coupled shafts do not coincide. Misalignment is the commonly fault in rotating machinery. Detection and diagnosis of shaft misalignment is crucial to achieve its optimal performance. The purpose of research is to diagnose shaft misalignment using multiclass support vector machine (SVM). The time-domain vibration signals of a shaft alignment rig with normal, parallel misalignment and angular misalignment of shaft conditions were obtained from vibration measurement signals. The accelerometer was used to measure vibration with a sampling frequency of 20 kHz at the constant speed operation of 1000 rpm. The features of median, RMS, crest factor, variance, kurtosis, shape factor, impulse factor, skewness, range, standard deviation and maximum were extracted from the vibration signal. The Principal Component Analysis (PCA) was applied for reduce the number of variables for data input to principal components with lower dimension. The multiclass SVM with One Against One (OAO) methodand linear kernel were used for classification. The results show that SVM for diagnosis of shaft misalignment show a good performance with an accuracy of 100%.
EXPERIMENTAL STUDY THE EFFECT ANGLE OF BLADE ON THE ELECTRICAL POWER OUTPUT OF PROPELLER PICOHYDRO TURBINE Abdullah Shalih; Purwadi Joko Widodo; Dwi Aries Himawanto
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35405

Abstract

This study aimed to analyze the effect of angle of blade on the horizontal flow to the performance of the propeller water turbine. The experiments were performed using several test parameters including the angle of blade on the variation mass flow rate of water. With potential head 2 meters and variated turbine blade angle to achieved optimal power generated.  The result showed that the variation of angle of blade with 300 angles and 11.6 l/s mass flow rate of water was the best variation to improve the performance of the propeller water turbine. The best variation can generated 32 Watt of electric power.
PENGARUH VARIASI CAMPURAN OKSI-ASETILEN PADA PROSES FLAME HEATING TERHADAP SIFAT FISIS DAN MEKANIK ALUMINIUM SERI 7075 Purnadityanto Purnadityanto; Teguh Triyono; Nurul Muhayat
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35406

Abstract

The optimum properties of aluminum can be achieved by the addition of alloy and heat treatment. An experimental study was conducted to investigate the effect of the oxy-acetylene mixture on the flame heating process on the physical and mechanical properties of aluminum 7075. Aluminum was heated to 480° C using an oxy-acetylene flame and then cooled rapidly. Then the results were compared with the specimen with flame heating + aging treatment. Variations of oxygen and acetylene mixtures were 0.75, 0.875 and 1 liter/min. The distance of the torch to the specimen's surface is 3 cm and the water flow rate is 1400 cc/min. The aging process is carried out with a temperature of 120°C for 3 hours + 165 for 1 hour. The results showed that the highest hardness value in flame heating treatment was 143,10 HVN with acetylene variation 0,875 liter/minute. The result of the impact test does not change much from the initial material toughness value, due to the average flame heating time that is not too long.
ANALISIS PENGARUH INFILL OVERLAP TERHADAP KARAKTERISTIK PRODUK HASIL 3D PRINTING DENGAN MENGGUNAKAN MATERIAL POLY LACTIC ACID (PLA) Fajri Sri Ardion; Heru Sukanto; Joko Triyono
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35408

Abstract

Rapid prototyping or commonly known as additive manufacturing uses metal and non-metal semi-liquid materials which are compacted layer by layer. Fused deposition modeling (FDM) is one of the methods in the additive manufacturing process that uses thermoplastic filaments (PLA and ABS). Poly Lactic Acid (PLA) or poly lactic acid is an organic plastic or bioplastic made from renewable biomass sources such as corn starch, pea starch and vegetable oils. Important factors affecting the quality of 3D Printing results are nozzle diameter, nozzle temperature, bed temperature, infill patern, infill percentage, print speed, layer thickness and infill overlap. Infill overlap is the percentage of overlapping processes of the filament during the printing process. This research was conducted to determine the effect of infill overlapon the physical and mechanical properties of 3d printing products. The infill overlapvariations used are 0%, 25%, 50%, and 75% of the nozzle diameter. 50% variation shows better quality when compared to other variations for density test, tensile test, and bending test.

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