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Jurnal Inovasi Mesin
Published by Universitas Negeri Semarang
ISSN : -     EISSN : 27467694     DOI : https://doi.org/10.15294/jim
Core Subject : Engineering,
Mechanical Engineering
The main scope of the JIM is to publish original research articles in the area of mechanical engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 25 Documents
 1   2   3 
Analysis of Electric Low Entry Microbus Chassis Strength by Using Finite Element Method Assa Affitra Ilham Alifian; Widya Aryadi; Andri Setiyawan
Jurnal Inovasi Mesin Vol. 8 No. 1 (2026): APRIL 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v8i1.17957

Abstract

Chassis is a component of a vehicle that functions as a support for all components and the weight of the vehicle such as the body, engine, transmission, suspension, to the load of passengers or goods. This study aims to determine the value of von mises stress, displacement, and safety factor, from each variation of the chassis thickness tested. This study uses a finite element simulation method with SolidWorks 2022 software to obtain von mises stress, displacement, and safety factor values from various variations of chassis thickness. The results of the finite element method simulation produce data in the form of von mises stress, displacement, and safety factor from 3 chassis thicknesses, the data also shows that the chassis with a thickness of 4mm has the most ideal results
The Effect of Additional Holes and Knurling on Outer Comp Clutch CVT on Torque and Power of Honda Scoopy K93 Firdaus Audtiya; Rizqi Fitri Naryanto; Abdurrahman; Hanif Hidayat
Jurnal Inovasi Mesin Vol. 8 No. 1 (2026): APRIL 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v8i1.28668

Abstract

Automatic motorbikes that have been used for more than five years tend to experience a decrease in responsiveness when starting due to wear on the CVT components, one way to improve the performance of automatic motorcycles are to optimize the power distribution from the engine to the wheels. This can be achieved through modifications to the CVT system, so that the power distribution process becomes more efficient and responsive, modifications are made to improve vehicle performance while reducing the impact of decline performance due to increasing age of use, which also has an impact on decreasing CVT performance. On the system CVT, the centrifugal clutch mechanism on the secondary pulley plays a role in connecting and disconnecting rotation from the secondary pulley to the wheel. The component that plays a role in receiving rotation from the clutch carrier is the outer comp clutch, one of the main causes of this problem is the presence of residual dust from the double clutch lining that is trapped inside the outer clutch, which causes slippage and disrupts clutch function. Modification by adding holes and knurling on the surface of the outer comp clutch friction plane is expected to overcome the problem of excessive vibration and slippage, as well as optimizing the performance of the CVT on automatic motorcycles, so that the torque and power produced can increase. The types of knurling applied to the outer comp clutch include straight, diagonal, and diamond knurling
Structural Strength Analysis of Floor Pan Battery Electric Vehicle Class Medium MPV Using Finite Element Method Muhammad Hafiz Izzuddin; Widya Aryadi; Haris Nubli
Jurnal Inovasi Mesin Vol. 8 No. 1 (2026): APRIL 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v8i1.31895

Abstract

This study aims to analyze the strength of the floor pan structure on the Battery Electric Vehicle medium MPV class using the finite element method. Simulations were carried out with Ansys 2020 software through static loading that was adjusted to the actual conditions of the vehicle. Floor pan design variations were studied based on the type of material, namely JIS G3101 SS400 (M1) and ASTM A1011 Grade 45 (M2), as well as material thicknesses of 1.2 mm (T1), 1.4 mm (T2), and 1.6 mm (T3). The simulation results show that increasing the material thickness decreases the von mises stress and displacement values, and increases the safety factor. ASTM A1011 Grade 45 material shows better structural performance than JIS G3101 SS400, with smaller displacement and higher safety factor at the same thickness. However, the increase in thickness also results in an increase in the mass of the floor pan. Based on the analysis, the M2T1 model is the best configuration because it produces a von mises stress of 161.68 MPa, displacement of 6.6796 mm, safety factor of 1.9174, and mass of 138.25 kg. This model meets the safety limit and mass efficiency, so it is recommended to be applied to the BEV medium MPV.
Optimization and Comparison of Linear and Curved Cone Contraction Designs Using the CFD Method for the Development of a Two-Dimensional Low-Subsonic Wind Tunnel Sulthan Dzaki Ahmada; Hendrix Noviyanto Firmansyah; Samsudin Anis
Jurnal Inovasi Mesin Vol. 8 No. 1 (2026): APRIL 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v8i1.32000

Abstract

The geometry design of the contraction cone plays an important role in determining the flow performance in a subsonic wind tunnel. This study aims to examine and compare two forms of contraction cone design, namely the linear model and the polynomial curve, in the development of a two-dimensional Low Subsonic Wind tunnel using the Computational Fluid Dynamics (CFD) numerical simulation method. The main objective of this study is to evaluate the effect of geometric shapes on velocity distribution, flow uniformity, and aerodynamic performance in the test chamber. Simulations were carried out using ANSYS Fluent software with the k-ω SST turbulence model, and the NACA 4412 airfoil was used as a test object to observe the aerodynamic forces. The simulation results show that the contraction cone with the polynomial curve design produces a more uniform flow, higher speed, and a better lift coefficient (Cl) than the linear design. In addition, the curve design is also able to suppress flow disturbances such as flow separation and boundary layer effects. Based on these findings, the contraction cone with a polynomial curve profile is more recommended for application in a two-dimensional subsonic wind tunnel to improve the efficiency and accuracy of aerodynamic testing.
Mechanical Integrity Verification of Atmospheric Sump Tanks under Sustained Hydrostatic Loading in Fuel Pipeline Facilities Farand Putra Hendratmo; Muhammad Ritzky Novhar; Dharu Feby Smaradhana
Jurnal Inovasi Mesin Vol. 8 No. 1 (2026): APRIL 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v8i1.42395

Abstract

Atmospheric sump tanks are commonly classified as low pressure equipment; however, when operated under sustained liquid filled conditions, their mechanical integrity may be governed by localized structural mechanisms rather than global shell membrane capacity. This study presents a calculation based mechanical integrity verification of a horizontal atmospheric sump tank subjected to sustained hydrostatic loading. The methodology integrates a hydrostatic pressure model with a specific gravity consistency check derived directly from the applied liquid head, and a component-based capacity evaluation performed using effective corroded thickness. The sustained design pressure (combining atmospheric base and hydrostatic head) is established as 1.135 bar (absolute), while the maximum allowable working pressure (MAWP) is evaluated for shell, heads, and nozzle discontinuities. Results indicate that while the global shell capacity is high, the integrity is governed by nozzle reinforcement limits, yielding a governing MAWP of 2.954 bar (gauge equivalent). Sensitivity analysis on fuel specific gravity demonstrates that reasonable density variations affect pressure demand magnitude but do not alter the governing capacity mechanism. Hydrostatic test pressure is subsequently verified using allowable stress scaling, yielding a test pressure of 3.840 bar. The findings demonstrate that integrity verification of atmospheric sump tanks under sustained hydrostatic loading must prioritize local discontinuity-controlled capacity and physically consistent demand modelling rather than pressure only membrane stress assumptions.

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