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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 91 Documents
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Initial Rotation Characteristic Investigation of a Hybrid Savonius - Darrieus Wind Turbine using 6 DOF Computational Fluid Dynamics Hangga Wicaksono; Sugeng Hadi Susilo; Bayu Pranoto; Muhammad Fakhruddin
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i1.47577

Abstract

The inconsistency of the wind flow considered as one of the factors which tend to decrease the performance of the wind turbine. This paper proposes a further analysis of the initial rotation characteristic of a hybrid Savonius - Darrieus wind turbine. The addition of the Darrieus blade intends to increase the aerodynamic stability of the overlapping Savonius turbine. This study implements 2D CFD transient analysis using the 6DOF methods in 00, 300, 600, and 900 Darrieus blade position along with 2 m/s, 4 m/s, and 6 m/s wind speed variations. The results of the aerodynamic analysis show that the location of the Darrieus 300 turbine provides the greatest initial repulsion, especially when the turbine rotation is above 900, the position of the Darrieus blade can provide additional impulse force when the Savonius turbine tends to be passive. This effect occurs more significant at higher wind speeds. Savonius with 3-blade modification has a more stable level of force distribution than the 2-blade modification, although the value is smaller. This shows that the 3-blade Savonius provide a higher stability of angular velocity development.
Pengaruh Perlakuan Preheat Partikel Al2o3 Pada Proses Stir Casting terhadap Sifat Fisik dan Mekanik Komposit Al6061- Al2O3 Eko Surojo; Henri Fatih Wibowo; Teguh Triyono; Agus Suprihanto
Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v19i2.43646

Abstract

Aluminium komposit secara luas digunakan untuk aplikasi kinerja tinggi seperti di otomotif, militer dan kedirgantaraan. Stir casting merupakan salah satu metode yang digunakan untuk memproduksi AMC (Aluminium Matrix Composite). Parameter dalam metode stir casting yang harus dipertimbangkan ketika proses manufaktur diantaranya adalah temperatur pengadukan, kecepatan pengadukan dan perlakuan pada partikel penguat karena akan berpengaruh terhadap sifat fisik dan mekanik komposit. Penelitian ini dilakukan untuk mengetahui pengaruh pemanasan awal serbuk Al2O3 terhadap porositas, kekerasan, laju keausan spesifik dan koefisien gesekan komposit Al6061-Al2O3. Proses manufaktur komposit dilakukan pada temperatur pengadukan 720-740°C, kecepatan pengadukan 600 rpm dan variasi perlakuan preheat pada partikel penguat Al2O3 dengan suhu ruang, 150℃ dan 300℃. Hasil penelitian menunjukkan bahwa perlakuan preheat pada partikel penguat Al2O3 berpengaruh terhadap porositas, kekerasan, laju keausan spesifik dan koefisien gesek komposit. Perlakuan preheat pada partikel penguat Al2O3 mampu menurunkan porositas, meningkatkan kekerasan dan koefisien gesek, serta menurunkan laju keausan spesifik komposit.  Pemberian perlakuan preheat yang optimal didapat pada suhu 300℃.
Simulation of the Pressure Vessel Saddle Thickness Effect to Stress Distribution Krisdiyanto Krisdiyanto
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 1 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i1.44938

Abstract

Cylinder pressure vessel is a device that is used to process industry, power industry, oil industry, and gas industry. Structure of pressure vessel has complex design that is used to accommodate force, temperature, internal pressure loading, etc. Pressure vessel loading is supported by two saddle. Loading pressure vessel is distributed to saddle as stress. Stress distribution can be checked by finite element software. Autodesk Inventor 2019 is a software that used finite element basic. This research aims to get the effect of pressure vessel saddle width to maximum stress at pressure vessel.
Perbandingan Induction Hardening dengan Flame Hardening pada Sifat Fisik Baja ST 60 Iswanto Iswanto; Edi Widodo; Ali Akbar; Angga Kharisma Putra
Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v19i2.43203

Abstract

This study will discuss the comparison between induction hardening with flame hardening in ST 60 steel in terms of tensile strength and microstructure. The induction hardening machine is designed and made by itself with the maximum heat generated reaching 650 °C. While the flame hardening machine uses an acetylene welding machine. After heating the specimen to 650 °C, it is then cooled using water. Each heating process uses three specimens for tensile testing and microstructure testing. From the tensile test results obtained that, ST 60 steel with induction hardening has a greater tensile strength compared to flame hardening. ST 60 steels which experienced induction hardening treatment also had higher strain compared to ST 60 steels which experienced flame hardening treatments.
Design Evaluations of Aerosol Suction Machine for Dental Treatment Practices in COVID-19 Era Fitrian Imaduddin; Seraf Steva Oryzanandi; Budi Santoso; Raymundus Lullus Lambang Govinda Hidajat
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.54711

Abstract

The aim of this paper is to demonstrate the evaluation process to select the Aerosol Suction Machine (ASM) design to be implemented in a dental treatment practice to prevent the spread of COVID-19. There are two designs evaluated, the movable ASM and the fixed mounting ASM. The evaluation process involved four evaluation criteria: flexibility, safety level, manufacturability, and maintenance. The evaluation is conducted based on a specific requirement of a small dental clinic located in Surakarta, Indonesia. The evaluation results show that the fixed mounting is more suitable for implementing in a small dental clinic with many natural ventilation openings.
CFD (Computational Fluid Dynamics) Modeling on Narasena Bengawan UV Team Quickster UAV Wings with Addition of Vortex Generator to Aerodynamic Performance Mohammad Fahmi Luthfi; Dominicus Danardono; Eko Prasetya Budiana; Yudi Kurniawan
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.50736

Abstract

This research is based on obtaining the best possible aerodynamic performance for the Quickster Narasena Bengawan UV Team UAV aircraft wing design. One of the factors that greatly affects the flying performance of a UAV is the wing. The wing on the Quickster Narasena UAV aircraft uses an MH33 airfoil, because MH33 is specifically for high-speed UAV aircraft. This research will discuss the comparison of the performance of a wing without a vortex generator with a wing with a vortex generator. Variations in the positioning of the vortex generator on the wing of the Quickster Narasena UAV will also be discussed in this study. The method used in this research is the CFD (Computational Fluid Dynamics) method. The simulation process will use the ANSYS Fluent 19.0 application with the K-Omega SST method with the Reynolds-Averaged-Navier-Stokes (RANS) equation as the basis. The purpose of this study is to obtain the results of the coefficient of drag, lift, and the contour of the turbulence that will occur. The simulation results that have been done are the geometry of the wing with the addition of a vortex generator can reduce the drag coefficient and can increase the lift coefficient.
Design And Control System of Automatic Control System of Coal Flow on Belt Conveyor Installation Bayu Pranoto; Chandra Gunawan; Hilmi Iman Firmansyah; Hangga Wicaksono; Andhika Angger Nugraha; Muhammad Trifiananto
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.51986

Abstract

In a power plant unit whose main fuel is coal, there is generally use a belt conveyor installation. This conveyor belt serves to supply coal from the crusher unit to the combustion chamber of the power generation unit. In this study, we discuss a case where the installation of a belt conveyor which was initially only one line was then made a new branch that supplies coal to other power generating units. Equitable capacity distribution and continuity of coal distribution are the main focus of this study. Therefore, a design of automatic control system of coal flow divider on belt conveyor installation was designed. The working principle of this coal flow splitting system is to control the movement of the straight blade plough that directs the flow of coal to each unit at the certain time and continuously. Straight blade plough in the form of steel metal plate with a thickness of about 10 millimeters in which one end is connected to the end of the pneumatic cylinder. Automatic control system of coal flow divider in belt conveyor installation designed using CX-Programmer and CX-Designer applications. CX-Programmer serves to create automatic control logic concepts. While the CX-designer functions to create a Human Machine Interface (HMI), making it easier for operators to control the course of the coal supply process. The results of this study are in the form of control logic lines that can be applied to Programmable Logic Control (PLC) device and Human Machine Interface (HMI) equipment.
Lunch Box Innovation Product Design In The Millennial Era Bayu Pranoto; Hilmi Iman Firmansyah; Hangga Wicaksono; Muhammad Fakhruddin; Rilis Eka Perkasa
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.52100

Abstract

Almost of kids in the world still bring a lunch box and a bottle of water in their bag when their go to school. His mother always prepares a lunch box complete with a bottle of drinking water, hoping that his son can enjoy his favorite lunch and avoid starvation. Sometimes the mother is very worried when the lunch box has been brought by the child but the water bottle is left behind. Then the mother was willing to take her child's water bottle to her school. This is certainly not expected by either the mother or the child. As a form of concern for the author to this problem, the author proposes a lunch box design with a lunch box lid that also functions as a drinking water bottle. The idea of this design proposal is ones grab, both are food & drink in your hand. The goal is how to make a kids can grab their food and drink easily and practice. So it is proposed to modify a top cover of common foodpack to become a drink bag. The design process begins with analyzing market needs, making sketches, creating 3D design models using the Autodesk Inventor CAD application, material selection, and product evaluation.
Design, Production Cost, and Air Flow Distribution of Biomass Pellet Furnace Heru Sutanto; Suyitno Suyitno; Wibawa Endra Juwana; Tito Gusti Nurrohim
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.49232

Abstract

Biomass attracts a great deal of attention to be converted into green fuels in the form of pellets. The furnace is needed to burn pellets to generate heat up to 300 kW. In addition to meeting the heat capacity needs of the small and medium-sized industries, furnaces must also be competitive in terms of price. The purpose of this study is therefore to obtain details of the cost of manufacturing the furnace and the model of air flow that occurs in the furnace. The cost of production of the furnace includes manufacturing costs, assembly costs, machining and repair costs. The findings revealed that the key portion of the cost of the furnace was a material cost of 77%. The findings of the simulation showed that the total pressure difference of up to 850 Pa and had to be resolved by air-supplying blowers. The gas velocity ranges from 2 to 10 m/s and rises significantly near the exit to 42 m/s.
Effect of Turbine Blades Transformation on Savonius Turbine Performance Muhammad Iyas Abdul Alim; Syamsul Hadi; Dominicus Danardono Dwi Priha Tjahjana
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48619

Abstract

The purpose of this study was to determine the effect of the transformation of savonius turbine blades using the Cp-TSR curve. The transformation referred to here is the change in the angular of the blade so that the area of the cross section of the blade moving downwind changes, by doing so the negative torque of the turbine obtained from the air flow is reduced. The specimen has 3 variations, namely, without transformation or conventional turbine and transformation of 5 and 10 degrees. With the reduction in the cross sectional area of the turbine blades, the authors hypothesize that the turbine performance will increase, but the blade transformation movement causes a shift in the center of mass which gives rise to vibrations that can directly affect turbine performance, and it could be that the negative  effect from these vibrations is much greater than the positive effect from reducing torque. Experiments were carried out using wind tunnels with load variations at 5, 6, and 7 m/s speed variations. The experimental results obtained show that conventional turbines have better performance than turbines with 5o and 10o blade transformations.

Page 6 of 10 | Total Record : 91

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