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Vivien Suphandani Djanali
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JMES The International Journal of Mechanical Engineering and Sciences Editorial Office Jurusan Teknik Mesin, ITS Kampus ITS Sukolilo Surabaya 60111 Building C, Floor 2 Indonesia
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Kota surabaya,
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INDONESIA
JMES The International Journal of Mechanical Engineering and Sciences
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : -     EISSN : 25807471     DOI : https://dx.doi.org/10.12962/j25807471
Core Subject : Science, Engineering,
Energy Materials Science & Nanotechnology Mechanical Engineering
Topics covered by JMES include most topics related to mechanical sciences including energy conversion (wind, turbine, and power plant), mechanical structure and design (solid mechanics, machine design), manufacturing (welding, industrial robotics, metal forming), advanced materials (composites, nanotube, metal foam, ceramics, polymer), metallurgy (corrosion, non-destructive testing, heat treatment, metal casting), heat transfer, fluid mechanics, thermodynamics, mechatronics and controls, advanced energy storage and devices (fuel cell, electric vehicle, battery), numerical modelling (FEM, BEM).
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 93 Documents
 1   2   3   4   5 
Numerical Study of Bach-bladed Savonius Wind Turbine with Varying Blade Shape Factor Kelvin Ibrahim; Vivien Suphandani Djanali; Nur Ikhwan
JMES The International Journal of Mechanical Engineering and Sciences Vol 4, No 2 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i2.7839

Abstract

Savonius wind turbine with Bach-profile blades is considered in this study. Previous studies have shown that a rotor with the Bach-profile blade produces better performance than a standard Savonius turbine. This study focuses on the blade shape factor variations of the Bach-profile blade to give the best performance. Two-dimensional unsteady simulations are performed with moving mesh. The configuration being tested is the Savonius rotor with Bach-profile blades with an arc angle of 135◦ . The blade shape factor is varied 0.2, 0.3, 0.4 at a constant freestream velocity of 4 m/s, with a corresponding Reynolds number of 20,000. The k-ω Shear Stress Transport turbulence model was used, with secondorder discretization schemes for the pressure and momentum equations. The boundary conditions were set as velocity inlet for the inlet, outflow for the outlet, and walls for the blade surfaces. The top and bottom sides were set as symmetric. Results showed that the configuration with a shape factor of 0.4 gave the best performance among the others. This configuration gave a higher moment coefficient and power coefficient of about 6.8% and 7.3%, respectively. Results extracted from the simulation includes the flow structure, and the distribution of the pressure coefficients along the blade surface.
The Analysis of Exhaust Gas Characterization in Reducing CO and HC Gas Pollution on the EFI Engine of Daihatsu Luxio 1500 CC Ismanto Styabudi
JMES The International Journal of Mechanical Engineering and Sciences Vol 1, No 1 (2017)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i1.2153

Abstract

Air pollution from highways, particularly in an urban area which density and mobility are already on the verge of solid boundaries, resulting in environmental and human health problems. This is due to the lack of standardization of testing exhaust gas by the governmental body. Accurate results from the test and technology standardization on exhaust system which is one important component for gas pollutant elimination from the vehicle.  In the present work, we examined the role of some modified exhausts on the level of pollutant exhaust, i.e. CO, HC, NOx gas. Experimental design for controlled variable is the speed, torque of the wheel, and gear position. Several modifications of exhaust gas were tested were tested, i.e.  Standard, 3-way catalytic converter, racing and 2-ways catalytic converter. The data is gained through dynamometer and exhaust gas Analyzer as a speedometer gauges, torque wheels, and levels of exhaust gas that comes out of the tailpipe. Statistical analysis of the results uses one-way ANOVA. The result showed that the order in reducing exhaust gas CO and HC are: (1) two-way exhaust gas and 3 Way Catalytic Converter exhaust gas, (2) standard and (3) modified exhausts. 3 Way catalytic converter was the best to eliminate NOx than other three exhaust gas system
Enhancing Savonius Turbine Self-starting Capability by Installing a Circular Cylinder in Front of Returning Turbine Blade Tri Yogi YUWONO; Ramadhan Ananto Bagas; Paramesti Suksmatatya; Merbasari Mahardina Festy; Lisdarina Elza; Nabila Arif Vega; Jeremia Dionisius; Lawrence Budhiarto Michael; Shuhufam Afiyah
JMES The International Journal of Mechanical Engineering and Sciences Vol 5, No 1 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v5i1.7651

Abstract

The effect of installing a circular cylinder in front of the returning turbine blade in enhancing the self-starting capability of the Savonius wind turbine has been studied experimentally by measuring the static torque of the turbine at the angular positions of the blades. The circular cylinder with a diameter relative to the blade diameter d/D = 0.5 is installed at a distance corresponding to the blade diameter in front of the returning turbine blade which is varied by 1.2 ≤ S/D ≤ 2.6. The experiments were carried out for Reynolds number (Re) = 74,000, 136,000, and 175,000. The results showed that the presence of a circular cylinder installed in front of the returning turbine blade at a distance of 1.4 ≤ S/D ≤ 1.8 was able to achieve the self-starting capability of the Savonius wind turbine as indicated by the positive values of the turbine static torque coefficient at all blade angular positions. The highest performance of the Savonius turbine self-starting capability is obtained at the circular cylinder position S/D = 1.6 for the Reynolds number (Re) = 136,000, and 175,000.
Dynamic Analysis of Narrow Tilting Three Wheeled Vehicle (NTTWV) with LQG Control Muhammad Fadlil Adhim; Unggul Wasiwitono
JMES The International Journal of Mechanical Engineering and Sciences Vol 1, No 2 (2017)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i2.3329

Abstract

The need for compact vehicles will increase in urban areas in the future. This paper propose solution by designing a vehicle that can combine advantage of car such as comfort and safety and the advantage of motorcycle such as efficiency and lightweight. The proposed vehicle has 3 wheels, 2 front wheels as steering wheels and the rear wheel as traction wheel. Active tilting system is used to give desired roll angel  that can resist the centrifugal force to maintain the vehicle stability. The goals of this research are to design dynamic model and control of NTTWV and its control system. The simulation result showed that the NTTWV rolls only 60% of ideal motorcycle rolling angle at same velocity and turning radius. The improvement of critical speed compared to non-tilting three-wheeled vehicle at steer angle = 5 deg and  10 deg are 193% and 171%.
Numerical Study of Airfoil Selection and Analysis of 3D Flow Phenomenon past Finite-Span Wings for Small UAVs Fauzi Perdana; Sutardi Sutardi
JMES The International Journal of Mechanical Engineering and Sciences Vol 4, No 1 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i1.9364

Abstract

Small unmanned aerial vehicle (SUAV) is an unmanned aircraft vehicle (UAV) that flies at an altitude of lower than 1,100 m from the ground, has a maximum gross takeoff weight of 10 kg, and a flight speed of less than 50 m/s. One of the design factors for the small UAV design with a fixed-wing propeller is the airfoil selection. The selection of an airfoil profile using aerodynamic concepts leads to a performance coefficient that determines the selected airfoil’s sustainability and efficiency. The coefficients used are CL, CD, and CM. Numerical studies were carried out using Computational Fluid Dynamics using XFLR5 and ANSYS Fluent 19.1 software to evaluate airfoils in 2D and evaluate the phenomenon of induced drag on the wings in 3D. Airfoil selection was made on five types of airfoils: AH 83-150 Q, E399, E431, E715, and E662. The coefficients of CL, CD, and CM were obtained by varying α. 3D analysis of selected airfoil geometry with finite span. Simulation of steady conditions using Reynolds-Averaged-Navier-Stokes (RANS) in the Spalart-Allmaras turbulent model with variations of α = 0 ◦ , 8◦ , 12◦ , and 16◦ . The post-processor visualized the flow around the wing with pressure contours, velocity pathlines, and tip vortices. The analysis was carried out on the aerodynamic coefficients of CL, CD, CM, and CMr with α variation on the finite span wing. Based on the research, the results showed that the selected airfoil was E431, the aerodynamic performance of the CL, CD, CL/CD, CM, and CMr wings. In addition, information was also obtained regarding a decrease in the pressure difference between the upper surface and lower surface of the wing with an increasing span, 3D streamline, the extent of the contour of the vorticity magnitude, and a streamline on the wingtip on the upper surface and lower surface of the wing.
Thermal Analysis on Water-Simple Rankine Cycle and Combined Cycle for Waste Heat Recovery Flat Glass Factory Zefanya Hiro Wibowo; Budi Utomo Kukuh Widodo; Djatmiko Ichsani
JMES The International Journal of Mechanical Engineering and Sciences Vol 1, No 1 (2017)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i1.2213

Abstract

One of the most important processes in glass production is the furnace section. The furnace’s waste heat, which still has a temperature around 400oC-500°C, is often released directly to the surrounding using a stack. Waste Heat Recovery Generation (WHRPG) and Organic Rankine Cycle (ORC) is one of the many waste heat reusing schemes implemented to increase the efficiency of industrial processes by converting the waste heat into electricity. Two schemes of the system will be studied in this research; there are Water-Simple Rankine Cycle (WSRC) and combined cycle (WSRC and ORC). In the WSRC, steam mass flow rate varied and found the highest performance to compare with combined cycle system. For combined cycle, the variations of the system are steam mass flow rate, the evaporating temperature, flue gas temperature in stack and refrigerant as working fluid. For the result, the highest combined cycle perform is 5.89 MW with steam mass flow rate 5 kg/s. Higher evaporating temperature (160°C) results in a higher combined cycle performance (5.96 MW), while, similarly, a lower flue gas temperature (120°C) also yields a higher combined cycle performance (6.3 MW). By varying the working fluids of R-11, R-113, and R-114.
Studies of the effect of melt spinning on the electrochemical properties of the AB2 Laves phase alloys Ika Dewi Wijayanti; Live Mølmen; Roman Denys; Matylda N Guzik; Stéphane Gorsse; Jean Louis Bobet; Volodymyr Yartys
JMES The International Journal of Mechanical Engineering and Sciences Vol 5, No 1 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v5i1.8466

Abstract

A comparative study of the effect of melt spinning on the electrochemical properties of the C14 and C15 AB2 alloys has been performed. The wheel speeds of 630, 2100, and 4100 cm/s were applied during the rapid solidification of both alloys. The structural analysis of the formed phases was performed by X-ray powder diffraction (XRD), while their microstructural morphology was studied by scanning electron microscopy (SEM). In both alloys a tremendous grain refinement due to the melt spinning process was observed: In addition, melt spinning also significantly contributed to the morphological variation of the microstructural changes in C14 alloys which showed changes from the equiaxed grain at lower speed to the small dendrites at higher speed. In contrast to the C14 alloys, the morphological variation was not observed for the C15 alloys. Furthermore, for both C14 and C15 alloys melt-spun at 2100 cm/s the maximum capacities of 435 and 414 mAh/g were achieved, respectively. As both alloys revealed the significant grain refinement due to the melt spinning, an increase in electrochemical capacity was achieved. However, the melt spinning parameters need to be further optimized to improve poor activation behavior of the rapidly solidified alloys.
Experimental Study on Effect of Injection Pressure to Spray Characteristics, Performance and Emissions of DieselEngine DI 20 C Using Biodiesel Fuel Alham A.K. Mahanggi; Bambang Sudarmanta; Hary Soebagyo
JMES The International Journal of Mechanical Engineering and Sciences Vol 2, No 1 (2018)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v2i1.5169

Abstract

Biodiesel as an alternative fuel can replace fossil fuels. However, biodiesel has a higher value of viscosity, density and surface tension to fossil fuels. Increasing the injection pressure on the injector is one solution to overcome the problem of high viscosity, density, and surface tension in biodiesel. This study aims to determine the effect of increasing injection pressure and injection timing variations on spray characteristics, performance and exhaust emissions diesel engine. Injection pressure namely 200, 210, 220, 230 kg/cm$^2$ by setting the rotation of adjusting screw the injector. The results of this study were obtained by increasing the pressure injection of biodiesel fuel by 230 kg/cm$^2$ resulting in fuel spray characteristics better than the standard 200 kg/cm$^2$ and resulting improvements in the penetration length, spray angle, the average diameter size of each 30$\%$, 28$\%$, and 9.78$\%$. And performance improvements and exhaust emissions also occur, namely Thermal Efficiency, Specific Fuel Consumption, and Smoke Opacity with values of 16.99$\%$, 14.15$\%$, and 46.39$\%$ improved respectively.
The Effect of Compression Ratio on a Diesel Engine Fueled with a Mixture of Medium Sulfur High Speed Diesel and Ethanol Atok Setiyawan; Arif Fadhlullah
JMES The International Journal of Mechanical Engineering and Sciences Vol 3, No 2 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v3i2.9388

Abstract

Various design modifications made by transportation equipment companies aim to increase the efficiency of fuel consumption. One of them is by reducing the dIndonesia relies on the use of fossil fuels (conventional), particularly in the fields of industry, transportation, and power generation systems. Fossil fuels are not sustainable energy sources, so their availability is limited. To reduce dependence on fossil fuels and reduce the negative impact on the environment, it is necessary to conduct research on energy sources, especially renewable and environmentally friendly ones. Bioethanol is a form of renewable energy that can be produced from plants. So that the use of fossil fuels can be replaced by ethanol fuel, especially for spark-ignition engines (SIE). However, when used in compressed ignition engines (CIE), plant fuels or vegetable oils have weaknesses that affect CIE performance, such as cetane number, calorific value, etc. so that engineering related to the fuel and engine is needed. This study will examine the effect of changes in the compression ratio in CIE fueled by a mixture of Indonesia medium sulfur content of Diesel Fuel (commercially name: Dexlite), Ethanol, and Emulsifier Tween 80 on engine performance and emissions. The results showed that the 10% emulsifier was used in all fuel mixtures because the separation time was the longest. After determining the emulsifier level, the DEX70 (70% Dexlite - 30% Ethanol) and DEX 80 (80% Dexlite - 20% Ethanol) fuels were determined because they have the best characteristics for exhaust gas emission parameters. Then, by changing the compression ratio on the engine, there is a change in engine performance and emission parameters. For DEX80 and DEX70 with CR 17.9 have the maximum brake thermal efficiency (BTE) as much as 25.52% and 25.16% respectively at maximum load, higher than Dexlite with CR 17.9 in which BTE as much as around only 24%. Increasing compression ratio significantly decrease smoke opacity of exhaust gas. DEX80 with CR 17 and CR 16 experienced an increase in smoke opacity by (175.41%) and (3.11%) against DEX80 with CR 17.9. Meanwhile, DEX70 with CR 17 and CR 16 experienced an increase in smoke opacity by (17.01%) and (236.05%) against DEX80 CR 17.9.
The Influence of Air Fuel Ratio on the Performances and Emissions of a SINJAI-150 Bioethanol Fueled Engines Ari Kurniawan; Bambang Sudarmanta; Dori Yuvenda
JMES The International Journal of Mechanical Engineering and Sciences Vol 2, No 2 (2018)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v2i2.6396

Abstract

In the present work, the effect of variation of air-fuel ratio on performances and emissions SINJAI-150 engine with bioethanol was conducted. Variation of the air-fuel ratio is done by setting the mass flow rate of combustion air using a supercharger. Engine performance was measured using a water brake dynamometer with a variable speed standard from 2000 to 8000 rpm at a fully open throttle condition. The results indicate that the natural intake system produces a relatively rich air-fuel ratio, with an average lambda of 0.68, so that the resulting performance is not maximum. The addition of aspirated 1 and 2 combustion air with the results in the form of average lambda at intervals of 0.8 - 1.1. On the aspirated 2, thermal efficiency increase averaged 50.32%, specific fuel consumption decrease averaged 32.74% and CO and HC emissions reduction average of 7.43 % and 25.77%.

Page 2 of 10 | Total Record : 93

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