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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 6 Documents
 1 
Search results for , issue "Vol 8, No 1 (2024)" : 6 Documents clear
Optimization of Process Parameter in the development of Ecofriendly Brake-pad from Coconut Fruit Fiber (Coir L.) And Oyster Sea Shells (Magallana-Gigas L.) Eziwhuo, Second Justice; Ossia, C. V.; Ojapah, M.M.
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.16418

Abstract

Coconut Fruit fiber, CFF (Coir L.) and Oyster Sea Shells, OSS (Magallana-gigas L.) were gathered from the waste peel and suspended in sodium hydroxide (NaOH) solution for 12h to remove the unwanted remnant. The fibers were washed with water to remove the residual NaOH and sun-dried for 5 days. The dried CFF and OSS was grounded into powder-form using electric grounding machine. Thereafter sieved to 75, 125 and 175µm grain size. The based materials, CFF and OSS were prepared into organic-based brake pads by compressive molding with different formulations of base materials, epoxy resin, hardener, graphite friction modifiers and copper chips. A commercially brake pad were used as control. The characterization of the brake pad produced are mostly influenced by molding pressure and grain sizes, respectively. Hence, the density, hardness, compressive strength, and tensile strength test values decreased with increase in grain size. Finally, the optimal values of all responses fall within standard requirements of brake pads as it compared favorably with commercially brake pads. Therefore, it can be concluded that the characterization of the developed brake pad compares satisfactorily and is capable of producing less vibration and noise during application of braking due to its high mechanical properties. Therefore, coconut fruit fibers and oyster sea shells can serve as a possible replacement for asbestos brake pad production.
Static Load Analysis of Various Wing Spar Profiles: A Comparative Study between Mathematical and Finite Element Methods Widyawasta, Widyawasta; Wikarta, Alief
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.20060

Abstract

Unmanned aerial vehicles (UAVs) have become increasingly essential in both civilian and military contexts, serving various roles such as surveillance, mapping, cargo transport, and specialized tasks. The demand for long-endurance surveillance UAVs is critical for covering vast areas continuously, prompting the development of Medium Altitude Long Endurance (MALE UAV). This paper explores the structural strength analysis of various wing spar profiles of MALE UAV using mathematical analysis and Finite Element Method (FEM) under static loads. The wings, pivotal for generating lift, are subjected to rigorous operational loads, necessitating robust structural reliability. While mathematical analysis provides fundamental insights, FEM allows for detailed simulations under various conditions. Comparative studies between mathematical analysis and FEM are conducted to validate the structural strength of MALE UAV wings, with a focus on different spar profiles. Aluminum Al7075-T6 is used as the material, with convergence tests ensuring FEM accuracy. The comparative analysis highlights significant variations in normal and shear stress among different spar profiles, with the widest disparities observed at the wing root, 6.40 and 1 MPa resp., and the least, 1.51 and 0.63 MPa, close to the wing tip position at 6.75 m. These insights underscore the critical role of structural integrity in optimizing UAV performance and reliability.
The Effect of Bending Selection for Restrain Load Analysis Crude Oil Pipeline at Pig Launcher Area Aswin, Aswin; Wicaksono, Mohamad Bayu; Wicaksana, Dewana Aryalintang
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.16889

Abstract

Bending on the pipeline has a major influence on the value of the restrain load that occurs in the pipeline system in the pig launcher area. This study aims to evaluate the effect of the selection of bends on the pipeline to restrain the pipeline. Large load restrains on pipeline restraints often occur in the pig launcher area resulting from the selection of bend pipes. Restrain load analysis is carried out to ensure that the selection of pipeline bending does not result in a large load to reduce system failure in operating conditions. The working design pressure is 680 psi with a design temperature of 130 F. Analysis of the pipeline restrain load system using CAESAR II software to see the most effective bending angle comparison to use. The results of the analysis show that the impact of selecting a bending pipeline in the pig launcher area greatly affects the value of the load restrain that occurs. The selection of bending by using a varied bending angle in the pipeline system is able to reduce the Restrain load that occurs. From the results of selecting the bending pipeline system, the bending angle of 90 degrees has the smallest load restrain value in every axis, the use of 30 degrees bend has the largest load restrain value in the X axis, and the use of 45 degrees bend has the largest load restrain value in the Y axis and Z axis
Multi-Objective Prediction of Drilling EMS-45 with Finite Element, Backpropagation Neural Network, and Metaheuristic Model Effendi, Mohammad Khoirul; Pramono, Agus Sigit; Suhardjono, Suhardjono; Sampurno, Sampurno; Harnany, Dinny; Pratiwi, Fungky Dyan
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.19269

Abstract

Making holes with the minimum thrust force and torque using a drilling machine is challenging for researchers because of the difficulties in setting input parameter such as the type of drill tool, point of angle, and feeding speed. Therefore, the trial-and-error method to predict optimum input parameters through experiment can be replaced with the Back Propagation Neural Network (BPNN) and metaheuristic method (i.e., genetic algorithm (GA) and Simulated Annealing (SA)) method to reduce costs and time. BPNN can be used to represent the input-output correlation precisely. However, obtaining a model with minimum Mean Squared Error (MSE) requires much data for training, testing, and validation. Since the obtained data from experiments requires expensive costs, combining data from experimental and simulation using ANSYS should considered to reduce the experimental costs. This study was then conducted to answer the research problem using an EMS 45 tool steel as the workpiece, with the three input parameters: type of drill tools (HSS M2 and HSS M35), the points of angle (118 and 134 degrees) and feeding speed rates (0.07 and 0.1 mm/s). The 32 data from experimental and modeling were used to model the correlation between the input and output parameters of the drilling process using BPNN. The BPNN’s network-model with minimum MSE is then used as the objective function to determine the input parameters to obtain the smallest value of thrust force and torque using the hybrid method using GA and SA.   
Charging and Discharging Process Analysis of Energy Management System Strategy Towards Battery Aging in Series Configuration Hybrid Vehicle Alim, Aditya Halaqul; Sudarmanta, Bambang
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.19690

Abstract

Batteries, crucial for hybrid and electric vehicles, inevitably experience capacity loss over time due to regular usage, known as battery aging. The degradation is influenced by factors like the C-rate, depth of discharge (DOD), and temperature variations. This study delves into a hybrid series-configured vehicle that integrates both a battery and an engine-generator as primary energy sources. The primary objective revolves around determining an optimal energy management system (EMS) that mitigates battery aging effects. Testing was conducted across varying speeds: 17 km/hour, 30 km/hour, and 50 km/hour, involving two operational modes—full electric and hybrid. The engine-generator activation was contingent upon the battery's state of charge (SOC) set at 40% and 60%, operating consistently at 7000RPM and 7500 RPM. Data collected from these experiments facilitated the assessment of battery aging, simulated through MATLAB Simulink software. The findings highlighted that the most favorable battery aging occurred at 50 km/hour, when the engine-generator was engaged at 60% SOC and operated at an engine speed of 7500 RPM. Notably, the hybrid mode showcased superior battery longevity, particularly at higher speeds.
Numerical Study of Heat Sink Models Mosquito Hotend on FDM 3D Printer to Determine Heat Transfer Characteristics Fadhlurrohman, Rafi; Dwiyantoro, Bambang Arip
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.19769

Abstract

Fused Deposition Modelling 3D printing technology is generally used to print polymer-based materials in the form of filaments. The FDM process begins with the filament entering the liquifier area through the throat using a filament feed mechanism. During this process, clogging often occurs in hotend components because the filament melts before reaching heat block. The clogging phenomenon will result in the filament unable to extrude properly, so that the results are not optimal. In this research, numerical study will be carried out to review the temperature distribution of the Mosquito hotend, as well as the effect of variations in air flow velocity at speeds of 0 m/s, 0.25 m/s, 0.5 m/s, 0.75 m/s, and 1 m/s. Based on the results of the CFD simulation, it was observed that the temperature at the Mosquito hotend is spread asymmetrically. On the heat sink component, the part facing the inlet of the airflow and the farthest point from the heater, has a lower temperature than the opposite side. This causes an asymmetrical temperature distribution during the heat break, so that the filament melting process does not occur evenly, which will result in clogging. In addition, airflow with a faster velocity will provide a better cooling system quality. This happens because the convection coefficient increases with the increase in air velocity, thereby increasing the amount of heat to be dissipated.

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