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All Journal Rekayasa Mesin Mesin Halaman Olahraga Nusantara : Jurnal Ilmu Keolahragaan Jurnal Teknik Mesin Indonesia
Ferryanto Ferryanto
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Modeling Muscle Activities of Squat Motion using OpenSIM Mihradi, Sandro; Ferryanto, Ferryanto; Harjanto, Samuel J.
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i02.756

Abstract

Human beings need to be able to monitor their muscle health. Muscle health can be assessed by directly measuring its signal using an electromyography sensor or, recently, from a musculoskeletal modeling software such as OpenSIM. OpenSIM is an open-source platform for modeling, simulating, and analyzing the neuromusculoskeletal system. This work aims to simulate muscle forces during squat movement using OpenSIM simulation and validate the results using electromyography sensors attached to the body. The squat movement data generated from the optical motion capture system and the force plate will be used as inputs for the OpenSIM software. OpenSIM can provide output, such as a graph of the working muscle forces. That graph will be compared and analyzed with a surface electromyography sensor results graph. Based on the analysis results, the chart of working muscle forces generated by the OpenSIM software has shown a similar trend to the graph of muscle activity resulting from surface electromyography sensor reading. Therefore, the simulation results from the OpenSIM software were validated, and it was implied that the data collection process and the modeling were done correctly.
Validity of Rating of Perceived Exertion (RPE) on Training Intensity in Recreational Runner Bagus Tri Budi Antoro; Apriantono, Tommy; Ferryanto, Ferryanto
Halaman Olahraga Nusantara : Jurnal Ilmu Keolahragaan Vol. 7 No. 2 (2024): Halaman Olahraga Nusantara (Jurnal Ilmu Keolahragaan)
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/hon.v7i2.14675

Abstract

The purpose of this research is to determine whether or not the Rating of Perceived Exertion (RPE) is a reliable instrument for determining the level of vigour with which recreational runners engage in their workouts. Information was gathered from a number of runners who were engaged in training of varied intensities, and their RPE ratings were compared with other techniques of determining the intensity of their training. According to the findings of the investigation, there is a significant association between the RPE scores and the actual severity of the training, which suggests that RPE has the potential to be a useful tool in assisting runners in regulating the intensity of their training. On the other hand, this research has certain shortcomings, such as the use of subjective measuring techniques, a very small sample size, and the possibility of bias in the RPE response. An improvement in the validity and accuracy of the use of RPE, an investigation into the variables that impact perceptions of exercise intensity, and an evaluation of the association between RPE and long-term exercise results are some of the recommendations for future study.
ANALYSIS OF SPARE PARTS REQUIREMENTS BASED ON THE FAILURE RATE OF A COMPONENT USING THE POISSON PROCESS METHOD IN A CASE STUDY AT PT. XYZ Tamitakarza, Herdi; Ferryanto, Ferryanto; Suweca, I Wayan
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1849

Abstract

This study presents the conclusions drawn from previous data analysis, highlighting several significant key findings. Firstly, an evaluation using a risk matrix revealed that the critical subsystem for the CC 206 Locomotive is the Diesel subsystem, which consists of four important spare part components: The respective MTTF values for the Injector Nozzle, Inverter, Seal Output, and Retainer are 29.292 hours, 18.943,1 hours, 13.442,1 hours, and 26.318,1 hours. Furthermore, the annual requirements for these components were calculated using a Poisson process based on their respective MTTF values. These findings provide valuable insights into the importance of these components and their annual requirements, which in turn will significantly contribute to the efficient maintenance and operation of the CC 206 locomotive. It is estimated that the annual requirements for these components are 21 units for the injector nozzle, 31 units for the inverter, 42 units for the seal output, and 23 units for the retainer. This study proposes a novel application of the Poisson process to estimate the annual requirement of spare parts based on actual component failure rates and their corresponding MTTF. The method offers the advantage of being data-driven, probabilistic, and suitable for systems with constant failure rates, making it highly effective for optimizing inventory levels in railway maintenance. This research provides a new insight into quantitative spare part planning that improves reliability-based inventory strategies in Indonesian railway operations.
Two-Dimensional Analysis of Lower Extremities to Predict Best Initial Condition on Marching Movement Faisal Afif, Daffa; Made Ayu Sinta Dewi, Ni; Irham Naufran, Denis; Paskalis, Felix; Ferryanto, Ferryanto
Mesin Vol 29 No 2 (2023)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2023.29.2.1

Abstract

Himpunan Mahasiswa Mesin ITB has a specific type of marching that follows a march song’s rhythm called “derap”. In practice, derap was a hard move to maintain and unify in a group. This difficulty was observed by noting the differences that occur between the subjects' initial and middle march motion conditions. The most noticeable difference was the height of the group. This study intends to observe and find how the differences vary in this motion. The differences that occur corresponded to the relative knee and ankle angle. This study utilized five active markers to reconstruct the lower extremities' activity during motion, one action camera at 60 fps, and a workstation. This study was also constrained by using three cycles of march song at 115 bpm. Direct Linear Transformation was used to obtain the intrinsic factor of the camera to reconstruct the motion. Evaluating the angular kinematic parameters of relative knee and ankle angle, the authors found the relative knee angle has increased from 110° to around 130°, which happened at the second song cycle and kept stable at the rest of the song. This result brought the conclusion that more extended derap motion would tend to a steady condition of relative knee angle and suggested that the subject should begin with 130° of relative knee angle to give less effort on marching.
Co-Authors Bagus Tri Budi Antoro Dedi Trisnawarman Faisal Afif, Daffa Harjanto, Samuel J. I Wayan Suweca Irham Naufran, Denis Lely Hiryanto Made Ayu Sinta Dewi, Ni Paskalis, Felix Raden Muhammad Mihradi Tamitakarza, Herdi Tommy Apriantono