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All Journal Sport and Fitness Journal Jurnal Energi Dan Manufaktur Teknika: Jurnal Sains dan Teknologi Jurnal Mechanical Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Jurnal Teknika Mesin International Journal of Engineering and Emerging Technology Natural Sciences Engineering and Technology Journal
Ainul Ghurri
Program Studi Teknik Mesin, Fakultas Teknik Universitas Udayana
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Social Sciences Transportation

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Pengaruh Variasi Diameter O-ring pada Permukaan Silinder terhadap Koefisien Drag Si Putu Gede Gunawan Tista; Ainul Ghurri; I Ketut Suanjaya Adi Putra
Mesin Vol. 25 No. 2 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Dalam aplikasi engineering banyak ditemukan peralatan yang menggunakan silinder, seperti tiang penyangga jembatan, cerobong asap, dan sebagainya. Peralatan-peralatan ini mengalami hembusan udara setiap saat, yang menyebabkan kekuatan konstruksinya mengalami penurunan, hal ini disebabkan adanya drag yang arahnya searah dengan arah aliran. Upaya yang dilakukan untuk mengurangi drag adalah dengan memanipulasi medan aliran fluida. Manipulasi aliran fluida dapat dilakukan secara pasif antara lain dengan menambahkan helical strake pada permukaan silinder, menambahkan penghalang di depan silinder dan sebagainya. Dalam penelitian ini manipulasi aliran fluida dilakukan dengan menambahkan O-ring pada permukaan silinder. Tujuan penelitian ini adalah menganalisa pengaruh variasi diameter O-ring terhadap koefisien drag. Penelitian ini dilakukan pada sebuah wind tunnel yang terdiri dari blower, pipa pitot, manometer, timbangan digital, dan silinder. Penambahan O-ring diletakkan pada permukaan silinder dengan variasi diameter O-ring yaitu 3mm, 4mm, 5mm, 6mm dan jarak antar O-ring 30mm. Silinder diletakkan ke arah vertikal. Bilangan Reynolds berdasarkan diameter silinder (60mm) adalah Re = 3,64 x .Dari hasil penelitian menunjukkan bahwa terjadi penurunan koefisien drag dibandingkan tanpa variasi O-ring. Nilai koesisien drag terendah didapat dari variasi diameter O-ring 5mm atau d/D=0,08 dengan nilai 0,650259, dimana terjadi penurunan drag sebesar  24,15% dibandingkan dengan silinder tanpa O-ring. 
Preliminary Study on Various Shaped Models of Delivery valve in Hydraulic Ram Pump – Experimental Results Made Suarda; I Gusti Bagus wijaya Kusuma; Made Sucipta; Ainul Ghurri
International Journal of Engineering and Emerging Technology Vol 5 No 1 (2020): January - June
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2020.v05.i01.p09

Abstract

Four shaped models of delivery valve had been investigated and compared to improve performance of a hydraulic ram. Hydraulic ram pumps have been constructed and operated. Most of them built locally using steel pipe fittings that commercially accessible in the market rather than factory-made one. These have assisted inhabitants in rural or hilly area where water sources available for water supply services or irrigations. However, the major problem challenged by the public was on designing and repairing of the impulse and delivery valves of the pumps. Performance of the pumps are affected predominantly by the both valves. One characteristic of the valves is their shape. Considered on the characteristics of the fluid flow through surface of plate and sphere object are different on the pattern and losses. Therefore, investigation is necessitated to find a proper shape of the delivery valve for enhancing the performance of the pump. In this research four valve models were experimented to assess the hydraulic ram pump performance on varies delivery heads. The results show that the sphere model of the delivery valve offered the best efficiency, then followed by the membrane, the half-sphere and the flat delivery valve models. However, the rounded model: sphere and half-sphere delivery valve model were facing obstructions in implementation for a high delivery head.
The Use of Tarpaulins on the Body of a Pickup Truck on Airflow Patterns and Pressure Distribution Characteristics: An Experimental Study I Kadek Arya Bayu Diloka; Anak Agung Adhi Suryawan; Ainul Ghurri
Natural Sciences Engineering and Technology Journal Vol. 2 No. 2 (2022): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v2i2.18

Abstract

The installation of tarpaulins on the body of pickup trucks is often used to protect goods from heat and rain, which affect airflow patterns, pressure distribution, and vehicle aerodynamics. This research was conducted to determine the airflow pattern and pressure distribution characteristics such as static pressure, dynamic pressure, and pressure coefficient that affect the performance of a tarpaulin-fitted pickup truck. Experimental tests were carried out on 6 specimens, namely pickup trucks without using a tarp or baseline, pickup trucks fitted with tonneau cover tarpaulins (type A), Aerocap tarpaulins with an angle of 0° (type B) and 12° (type C), and Cincing tarpaulins with foot angle of 30° (Type D) and 15° (Type E) in the wind tunnel at a speed of 5.47 m/s. The results showed that the more aerodynamic the use of tarpaulins resulted in a streamlined flow pattern, as shown by the use of 12° aerocap tarpaulins, which had more aerodynamic flow and the most stable fluctuations in the Cp value, blockage mass, and smaller obstacles compared to other pickup trucks.
Analysis of Variations in Tub Cover Tarpaulin Shape against Airflow Patterns and Pressure Distribution Characteristics on Pickup Trucks with the Addition of Roof Deflector Aditya Mulyawan; Anak Agung Adhi Suryawan; Ainul Ghurri
Natural Sciences Engineering and Technology Journal Vol. 2 No. 2 (2022): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v2i2.19

Abstract

This study aimed to analyze the airflow pattern and pressure distribution characteristics of a pickup truck with a roof deflector added. with an angle of curvature of 20° and is accompanied by the installation of a tarpaulin cover on the body of the pickup truck. The method used in this study is an experimental method by testing 6 specimens, namely a pickup truck added with a roof deflector without using a tarp or baseline, a pickup truck added with a roof deflector fitted with a tonneau cover tarp (type A), aerocap tarpaulin with an angle of 0° (type B). and 12° (type C), and cincing type tarpaulin with a foot angle of 15° (type D) and 30° (type E) in a wind tunnel with a speed of 5.47 m/s. The more aerodynamic the use of tarpaulin, the more the blockage mass will be reduced so that it can produce a streamlined flow pattern. The results showed that the pickup truck added with a roof deflector with a 15° cincing tarp had a stable Cp value fluctuation at the rear of the pickup truck, while the pickup truck added a roof deflector with a 12° aerocap tarp. as well as produce aerodynamic flow thereby reducing the occurrence of blockage mass and obstacles.
Co-Authors Aditya Mulyawan Agus Adi Putra Anak Agung Adhi Suryawan Ari Dwi Agus Sulistyo Dewa Gede Angga Pranaditya F, Feliatra Hendra Widjaksana I Gusti Bagus Wijaya Kusuma I Gusti Ngurah Bagus Mahendra Putra I Gusti Ngurah Priambadi I Gusti Putu Jaya Nuartha I Kadek Arya Bayu Diloka I Ketut Suanjaya Adi Putra I Made Krisna Dinata I Nengah Suweden I Nyoman Suparta I Nyoman Suparta I Putu Adiartha Griadhi I Putu Gede Adiatmika I Wayan Widhiada I.K.G. Wirawan Kadek Bayu Laksana Ketut Astawa Ketut Budiarta Luh Putu Ratna Sundari M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Made Suarda Made Sucipta Ngurah Putra Wibawa Putra, I Ketut Suanjaya Adi S.P.G. Gunawan Tisna Si Putu Gede Gunawan Tista SPG Gunawan Tista SPG Gunawan Tista SPG Gunawan Tista, SPG Gunawan Susy Purnawati Syamsudin Syamsudin Wayan Nata Septiadi