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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 93 Documents
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Study on Increasing the Cracking Resistance of Unsaturated Polyester Composites with MMA and Rice Husk Fiber Reinforcement Nusyirwan Nusyirwan; Rully Pratama
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 2 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i2.15633

Abstract

The development of polymer composite materials has been widely developed as an alternative material to replace metal materials due to various advantages such as having relatively good mechanical strength, low density, and easy manufacturing process, but polymers have many disadvantages that they easily crack when impacted. One of the most widely used materials for composite matrices is unsaturated polyester polymers which are widely used in vehicle, aircraft, and ship hull components as well as vehicle components. The crack study is important because it causes the material to no longer be able to support loads below its yield strength, therefore causing failure to occur more quickly. One way to overcome material failure due to cracks in composite materials is to prevent crack propagation by adding reinforcing materials. In this study, a composite material was made using rice husk fiber to increase the crack resistance of the polyester composite matrix. From the results of the crack test, it is known that there is a tendency to increase the percentage variable of the addition of rice husk by 5%, 10%, 15%, and 20%. The expected value obtained to determine the crack resistance of the material is the value of the stress intensity factor (K1c). The highest K1c price was obtained at a 15% rice husk percentage variable of 1.558 MPa.m0.5, this price could increase the price of the pure polyester stress intensity factor (K1c) by 0.667 MPa.m0.5, indicating an increase of 233.58%.
Optimization of 3D Printing Parameter Process for Product Tensile Strength from PLA Materials Using the Taguchi Method I Made Londen Batan; Arleta Listiyana Chandradewi; Arif Wahjudi; Dinny Harnany
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 2 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i2.16985

Abstract

Three-dimensional printing or 3D Printing is one of the revolutionary machines in addictive manufacturing techniques to create three-dimensional objects with complex structures. Until now there are many techniques in 3D printing, one of which is Fused Deposition Modeling (FDM), which is currently widely used because of its ease and low operational costs. However, in the printing process, there are important things that must receive attention, namely the process parameters. Because this is what really determines the quality of the printout. In this research, an analysis of the effect of process parameters such as: infill rate, infill pattern, extrusion temperature and layer thickness were carried out on the tensile strength of the printed product. The method used is the Taguchi method with the Orthogonal Array L 9 (3 4) experimental design. Three tensile test specimens were printed for each variation using a Cubic Chiron 3D printer, so a total of 27 specimens were printed. All specimens were tensile tested according to ASTM D638 standard, the results were analysed based on the average value and signal to ratio (SNR) value and their significance by analysis of variance (ANOVA). The results of the analysis show that the infill rate, infill pattern and layer thickness have a significant effect on the tensile strength of the printing results. The optimal value of the tensile strength is 56,876 MPa, occurs in the concentric pattern with an infill rate of 90%, and a layer thickness of 0.2 mm. From the confirmation test, the confidence interval values were obtained from 55,477 MPa to 58,275 MPa, meaning that the optimal predictive value was not significantly different from the confirmation test value.
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.
Prototyping of Regenerative Braking System Based on Hybrid Energy Storage System in Electric Vehicle Prototype E-Trail Bangkits Romadhon HS, Maulana Ray; Sudarmanta, Bambang
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 2 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i2.19865

Abstract

The use of a Hybrid Electrical Energy Storage System (HESS) using a battery and supercapacitor in regenerative braking system on BANGKITS E-Trail prototype has the potential to offer greater power density and cycle life. The aim of the study was to maximize the recovery of energy during braking using the system, while improving the performance of E-Trail BANGKITS. The proposed regenerative braking system based on HESS was designed and fabricated while considering energy recovery capacity, and maximum electsamarical load. After fabrication, the system was tested for its efficiency, in energy recovery and to drive the vehicle using recovered energy. The tests were conducted in two steps, which are stationary, and dynamic tests, using a variation of motor and vehicle speed. The results of the tests showed in regenerative mode, system can recover up to 4410 J of energy with 41% efficiency with ascending trend as motor speed increases, while in drive mode, system can successfully drive the vehicle at 1430W power draw, and 14.8s of discharge time. In vehicle performance test, system was capable of generating braking force of 427.92N at 36% braking contribution. System can also extend the driving range of the vehicle by 2.4% of test route distance.
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
The Shear Layer of I-53° Type Cylinder as Passive Control for Main Cylinder Drag Force Modification: A Numerical Analysis Louis, Hendri; Sakti, Gunawan; Widodo, Wawan Aries; Aisyah, Imaniar Fitri
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 2 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i2.15014

Abstract

Numerous engineering disciplines have conducted a substantial study on cylinder-flowing airflow. There are several engineering uses for this flow arrangement, and it remains one of the primary research issues in aerodynamics. Due to the separation of the flow passing through the cylinder, the circular cylinder shows a significant dynamic drag. Ansys Fluent® was used in this study to construct the aerodynamic forces of the central cylinder and its disturbance in laminar flow in 2D. This investigation was conducted using the main cylinder with a diameter of 60 mm, an I-53o type disturbance cylinder, a space of s/D=1.375 between the two cylinders' central points, and a Reynolds number Re = 5.3 × 104 at velocity U = 14 m/s. The transition k-kl-ω (3 eqn) turbulence model was used in this simulation. By comparing various measuring parameters between single and tandem cylinders, this study showed that tandem cylinders offer good aerodynamic performance. The investigated measurement parameter is the coefficient of pressure (Cp), representing the degree of separation delay surrounding the central cylinder. The lift coefficient (CL) reduces by 15%, the coefficient of drag (CD) drops by 46.95%, and the appearance of the pressure and wind speed contours depicted the separation delay and decrease in pressure drag.
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.   
Influence of Front and Rear Wings on Aerodynamic Forces in a Student Formula Car Noor, Dedy Zulhidayat; Mirmanto, Heru; Anzip, Arino; Sasongko, Herman
JMES The International Journal of Mechanical Engineering and Sciences Vol 8, No 2 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i2.21073

Abstract

Aerodynamic forces affect the stability of a car when moving, especially when turning. This study conducted a CFD analysis of the influence of wings on the student formula car when turning. The addition of front and rear wings to the formula car increases drag, downforce, and side forces. Except for an airplane that is landing, large drag forces are always avoided, as well as side forces that can interfere with vehicle stability. Interestingly, in contrast to drag and downforce, the coefficient of side forces tends to decrease as cornering speed increases. The increase in downforce or negative lift in this formula car is more dominant and significant than that in the others, and it is very beneficial in increasing wheel grip and traction on the car’s stability when turning
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.

Page 8 of 10 | Total Record : 93

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