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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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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 8 Documents
 1 
Search results for , issue "Vol 7, No 1 (2023)" : 8 Documents clear
Automated Corrosion Detection on Steel Structures Using Convolutional Neural Network Mohammad Khoirul Effendi; Bara Atmaja; Arif Wahjudi; Dedi Budi Purwanto
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.15881

Abstract

Steel is a material that is widely used in industry and construction. The tensile and compressive force of steel is relatively high compared to other materials. On the opposite, low corrosion resistance is the main weakness of steel, which can encourage steel deterioration and fatal accidents for the user. Furthermore, regular visual inspection by a human should be performed to prevent catastrophic incidents. However, human visual inspection increases the risk of work accidents and reduces work effectiveness. Therefore, a drone with a camera is one solution to increase efficiency, increase security levels, and minimize difficulties or risks during corrosion inspection. In this research, the drone has been used to capture corroded video of a construction structure. The convolutional neural network (CNN) method is then used to detect the location of the corroded images. This study has been conducted on Surabaya’s Petekan-bridge with the Mobilenet V1 SSD pre-training model. In this study, the distance between a drone and the detected object varied between 1 and 2 m. Next, the drone speed was varied into 0.6 m/s, 0.9m/s, and 1.3m/s. As a result, CNN can detect corrosion on the surface of steel materials with the best accuracy is 84.66% and minimum total loss value of 1.673 by applying 200 images, 200000 epochs, batch size at 4, learning rate at 0.001 and 0.1, the distance at 1 m, drone speed at 0.6 m/s. 
Numerical Study of Reducer Modification with Adjuster Opening Variations on Turbine Lube Oil Pipe Agus Aopik; Bambang Arip Dwiyantoro
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.12065

Abstract

The success criteria of the power plant are represented by EAF (Equivalent Availability Factor) value. In 2021, one of the causes of the Forced Outage (FO) at Adipala Steam Power Plant was the failure of the main lube oil turbine pipe. The sudden contraction of the reducer resulted in the previous failure. Modifications were made to the reducer using a conical shape to reduce the number of welding processes and minimize the probability of failure. Therefore, a study on reducer modification needs to be carried out to study the impact of changing the shape of the reducer and changing the opening check valve on process parameters and flow in the main lube oil turbine pipe. The modification of the reducer was the main focus in this study. This research aims to analyze the pressure of turbine lube oil in the existing adjuster and the modified adjuster, using the Computational Fluid Dynamics technique with check valve adjuster variations (distance between the tip of the check valve and the inner wall of the reducer). The inlet boundary condition was defined by a pressure inlet of 285803.4 Pa. Outlet boundary condition was set by a mass flow of 65.72 kg/s. The curve surface was set as wall boundary conditions with a stationary wall, no-slip, and standard roughness model. The oil pressure in the modified adjuster increased compared to the oil pressure in the existing adjuster. The pressure on the oil flow was required to distribute oil to the turbine bearings. With the small increase in pressure after the modification, the turbine lube oil transfer improved. The pressure drop (ΔP) value that occurred in the conical-shaped modified adjuster was smaller than the pressure drop (ΔP) in the existing adjuster. This is because the resistance on the modified adjuster was less than the existing adjuster. The flow streamlines that formed backflow and vortex on the conical modified adjuster were less compared to the existing adjuster due to fewer obstacles in the conical modified adjuster.
Impacts of Application Light-Emitting Diode (LED) Lamps in Reducing Generator Power on Ro-Ro Passenger Ship 300 GT KMP Bambit Suardi Suardi; Aung Ye Kyaw; Amalia Ika Wulandari; Fahmi Zahrotama
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.15004

Abstract

KMP Bambit is an Indonesian Ro-Ro ship that carries passengers. It is public transportation from Merauke Regency to Asmat Regency and vice versa. The ship is still using fluorescent lamps as its main lighting source. This study presents a comparative study of the efficiency level between the use of fluorescent lamps and LED lamps in the room aboard the ship. The method used is the zonal cavity (lumen) method by dividing each room into three parts, namely the height ceiling cavity (hcc), height room cavity (hrc), and height floor cavity (hfc). The illumination value was determined according to the standards set for each room. The principal results for comparing lighting power on KMP Bambit showed that the total lighting electrical load accumulated using the fluorescent lighting type was 24.31kW. In contrast, LED lighting had a total lighting electrical load of 16.51 kW. This reduced the generator power from 68 kW to 60 kW, which could improve the efficiency of ship fuel operational costs. This study can evaluate the existing Ro-Ro ship fleet and be a good option in the process of building Ro-Roships in the future.
Design and Fabrication of Composite Monocoque Chassis for Formula Student Racing Car Alief Wikarta; Ismail Maydiyanto
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.13357

Abstract

This study uses a combination of analytical, simulation, and experimental methods in the design process of a sandwich-structured composite monocoque chassis. The analytical method, which determines the stiffness value of the composite, depends on the number of layers and the orientation of the fiber angle. The simulation method, which is based on the finite-element method, is used to validate the stiffness value. The experimental method involves a 3-point bending test used to verify the effectiveness of the design produced by analytical and simulation methods. After all model designs were validated through simulation and experimental methods, the next stage is fabrication. The stiffness and strength are achieved with variations, which have combined layup orientation angles of 0° and 45°. This can be applied to all panels, regardless of the number of layers. Based on the design results, the processes involved in fabricating the monocoque chassis begin with the manufacture of molds and the lay-up of carbon fiber. The process is continued by inserting the prototype into the oven, after which the final product then undergoes finishing to prepare it for use. The fabricated monocoque chassis has been used in 2 events in Japan’s annual Formula SAE student racing car competition.
Numerical Study of Damper Plate and Nozzle Effect on Vortex Turbine Basin for Increasing Flow Kinetic Energy Entering Turbine Rotor Herman Sasongko; Wildan Alfa Rahman
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.16270

Abstract

The Gravitational Water Vortex Power Plant (GWVPP) is a small-scale hydroelectric power generator that makes use of the energy generated from a vortex flow to turn turbine blades and generate electricity. In this research study, the focus was on the numerical analysis of the basin design of the GWVPP, which is divided into three sections: vortex generator section, transformer section, and turbine section. To support the transformation process from tangential vortex speed to axial vortex speed in the transformer section, a damper plate was installed to direct the rotating flow. The effect of the nozzle in accelerating the flow for optimizing the basin design was also studied to reduce blockage caused by the transformation process. The numerical results indicate that designs with nozzle have lower velocity outputs due to blockage from the rotating flow. At flow rate of 0.1 m3/s, the presence of damper plate reduces the maximum flow rotation, but at flow rate of 0.2 m3/s, it prevents flow leakage on the surface. The basin design without damper plate and nozzle is the optimal variation for flow rates of 0.1 m3/s, while the design with damper plate but without nozzle is optimal for flow rates of 0.2 m3/s.
Effect of Fluctuating Load on Fatigue of PPCW Flat Wagon Teguh Suprianto; Achmad Syaifudin; Lanang Wahyu Pamungkas; Julendra Bambang Ariatedja; Abdul Rohman Farid
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.14354

Abstract

Flat wagons are logistic railway vehicles that are always subjected to a heavy dynamic load. One type is the 42 ton flat wagon developed by INKA Ltd., which is well known as PPCW flat wagon. The initial design of this flat wagon was operated using a container. Nevertheless, it can operate safely without a container as well. This study was conducted to mitigate the effect of fluctuating load on fatigue of 42 ton flat wagons as cement carriers, with or without a container. The 3D flat wagon model was built and exported to ANSYS Workbench 19 to simulate the effect of the variable and mean stresses generated within the wagon. Several operational modes were applied to the model, such as an accelerated condition of 0.21 m/s2, a constant straight track, a turn uphill track, an inclined track, a turn downward track, and a decelerated condition of 0.3 m/s2. Transient structural, static structural, and modal analysis types are applied in the simulation consecutively to adapt the track variations. Due to the loading being dominated by compressive load, a negative stress ratio of 1.5 was utilized as the stress ratio of alternating stresses. The numerical study indicated that the straight, turn uphill, and turn downward tracks could exaggerate the stress generated due to dynamic loading. Potential fatigue failure could occur because the dynamic load produced fluctuating stresses, either alternating or mean stresses, that could damage the structural integrity of the flat wagon.
Analysis of the Electromagnetic Vibration Absorber (EMVA) Mechanism Placement in the MDoF System towards Vibration Reduction and Generated Electrical Energy Wiwiek Hendrowati; Aida Annisa Amin Daman; Nugraha Merdekawan
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.15519

Abstract

This research was conducted to determine the effect of the position of Electromagnetic Vibration Absorber (EMVA) to reduce the vibration of main system and to generate the energy. This article reports the results of a simulation and experimental study on the main system, which was excited by external force and the resulting vibration was reduced with an EMVA. The design of EMVA is in laboratory scale. The main system consists of a flat plate as a main mass and four springs, which are subjected to an excitation force that comes from the DC motor. The results show that both the simulation approach and experiment correspond well. The reduction of main system’s vibration is found to be affected by the position of EMVA. The maximum reduction in translation, rolling, and pitching direction occur at different position, which are at point 7 for translation and at point 1 for rolling and pitching. Meanwhile, the highest power generation occurs when the EMVA is at point 1.
Experimental Study on the Influence of Stress Concentration on the Flexural Stability of Aluminum Hollow Tube Ganesh Radhakrishnan; Sami Sulaiman Al Khusaibi; Amjad Juma Al Subaihi; Al Azhar Zahir Al Ismaili; Al Salt Malik Al Maani
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.14328

Abstract

Solid sections are gradually replaced by the hollow sections in most of the structural applications in various engineering fields due to their attracting features such as light-weight and high specific strength. In the present investigation, one such attempt was made to investigate in detail about the flexural capability of an aluminum hollow tube (AHT) with square cross section. The objective of the investigation is to study about the influence of stress concentration on the flexural behavior of the hollow tube. The type of stress concentration considered in the investigation was through hole of different cross section and quantity. Three-point bending test with concentrated load is conducted on the specimens of hollow tube with different types of stress concentration such as circular hole, square hole and perforations. The load was applied manually during the bending test. The bending test was carried out on all specimens for various support span of 110, 130, 170 and 200 mm respectively. The output measures of the study are maximum bending load, deflection and flexural stiffness. The maximum bending load capacity around 5.7 kN was observed for AHT with circular hole with support span of 90 mm. The maximum deflection measured at the mid span of the beam increases rapidly when the aspect ratio increases from 73.33 to 93.33, whereas after which the variation of deflection is marginal for the increase in aspect ratio from 113.33 to 133.33. This was due to the effect of spring back, which dominates more on the bending behaviour at shorter span between the supports

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