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All Journal Piston: Journal of Technical Engineering IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Jurnal Polimesin
Mulyadi Mulyadi
Universitas Pembinaan Masyarakat Indonesia
Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Kegagalan Laminasi Komposit Epoksi/Serat Karbon Pada Sayap Pesawat Tanpa Awak Ansor Salim Siregar; Mulyadi Mulyadi; Syaiful Arief
Piston: Journal of Technical Engineering Vol 5, No 2 (2022)
Publisher : Prodi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8540.106 KB) | DOI: 10.32493/pjte.v5i2.18596

Abstract

This study aims to analyze the initial failure value using the Tsai – Wu criteria from the wing skin of an unmanned aircraft with the Eppler 214 airfoil model. The study was carried out using computer modeling with Abaqus software. The material used is an epoxy composite which is carbon fiber. The composites used in the wing skins have two different arrangement sequences, namely the fiber layer arrangement sequence 1 [00/900]8s and the layer sequence 2 [00/+450/-450/900]2s. The load given to the wing is a pressure of 0.40077 MPa. The results for the fiber layer sequence 1 [00/900]8s at the maximum stress distribution are 5.067 x 104 MPa and in the fiber layer sequence, 2 [00/+450/-450/900]2s the maximum value is 4.205 x 104 MPa. While the sequences consist of fiber layer 1 and layer 2 sequence layers, the Tsai – Wu failure meets the Tsai – Wu failure criteria because almost all of them fail
Studi Awal Pemodelan Aerodinamika Sayap Pesawat Tanpa Awak Kecepatan Rendah Mulyadi Mulyadi; Tony Siagian
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 2 No 2 (2023): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v2i2.60

Abstract

This research is a prelimenary study of unmanned aerial vehicle design process. The study is conducted to understand the effect of wing shape on pressure of  the  wing  surface and to analyse air flow model on the wing surface and surround it that is crucial for the next design step.  Finite element method has been performed with the aid of computer. Computational fluid dynamics was carried out by using Freecad 0.21 software comes with powerful  OpenFOAM® Computational Fluid Dynamics workbench. Straight, tapered and tapered-bend wing shape were simulated with 1000 mm in length and constructed according to NACA 6412 profile. Straight wing had mean chord length of 100 mm while tapered wings were 80-120 mm. Furthermore, 20 m/s of wing speed was involved in simulation with angle of attack of 2 degree. Modeling results were robustly managed by means of Paraview 5.5.2 software. Results revealed that maximum surface pressure was formed on leading edge with 190 Pascals on straight wing and 210 Pascals on tapered-bend wing. Laminar air flow along wing profile was discovered without any vortex shedding occurred after passing the trail edge surface. Finally, simulation results discovered that there is a pressure difference on the top and bottom part of the wing. As the result, lifting force was created as expected.
The Effect of Adding Aluminum Scrap to Motor Vehicle Mufflers to Reduce the Danger of Exhaust Emissions Ahmad Marabdi Siregar; Chandra Amirsyahputra Siregar; Khairul Umurani; Mulyadi Mulyadi; Tony Siagian; ML Teguh Samudra; Aufa Afika
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3263

Abstract

Air pollution due to motor vehicle exhaust emissions is increased. Polluted air harms human health dan the environment. Consequently, it is essential to make a sustained effort to reduce air pollution. The purpose of this research is to investigate the effect of adding aluminum scrap to the exhaust system of a motor vehicle on gas emissions composition. The motor vehicle exhaust system was modified to accommodate aluminum scrap placement. A gas analyzer was utilized to observe exhaust gas composition, such as carbon dioxide, hydrocarbon, and carbon monoxide.  Aluminum scrap with different masses was wrapped around the exhaust's inner tube in 50 gr, 70 gr and 90 gr. The engine speed was maintained at 500 rpm throughout the testing process. It was found that the temperature of the outer exhaust tube is in a range of 40 degrees Celsius to 50 degrees Celsius. The results revealed that the most appropriate amount of aluminum scrap was 90 gr n to reduce carbon monoxide, hydrocarbon, and carbon dioxide in an exhausts gas. The surprising outcome was 76.78 % of carbon monoxide content declined, and furthermore hydrocarbon, and carbon dioxide content were deteriorated by 61.63% and 78.37%, respectively
Co-Authors Ahmad Marabdi Siregar Ansor Salim Siregar Aufa Afika Chandra Amirsyah Putra Siregar khairul umurani ML Teguh Samudra Syaiful Arief Tony Siagian