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All Journal Elkom: Jurnal Elektronika dan Komputer SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Prosiding Semnastek Journal of Applied Sciences and Advanced Technology Priviet Social Sciences Journal Advance Sustainable Science, Engineering and Technology (ASSET)
Junaedi, Thomas
Universitas Muhammadiyah Jakarta
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Modification of Digital Oil Pressure Measurement Equipment using Bluetooth Technology Rasma Rasma; Thomas Junaedi; Hendro Purwono; Riki Effendi
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 13, No 2 (2019): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.13.2.103-109

Abstract

PT United Tractors Tbk Jakarta workshop held a lot of Machine Inspection Programs for Komatsu units. During the implementation of the Machine Inspection Program (PPM) the machine inspection program is one part of the maintenance that is carried out periodically to obtain accurate data on the condition of the equipment at the time by carrying out checks and adjustments using measurement methods and diagnostic instruments The use of a pressure gauge is still using manual and has a measurement distance that is still limited, if workers or mechanics are not equipped with sufficient knowledge then the pressure gauge will have the potential for error in use and the selection of a pressure gauge is not appropriate to the pressure gauge directly connected to the hydraulic pressure through the hose then the work process ppm is not enough 1 manpower. Therefore it is necessary to modify a digital pressure gauge that has a wide range of scales, in addition a wireless connection is needed to enable the operation of the unit and measurements are made 1 manpower and Bluetooth is one of the right choices in addition to the reach can be met in an application not too difficult so that readings measurement results can be connected directly via mobile.
Rancang Bangun Mesin Traktor Pembajak Sawah Berbasis Tenaga Solar Cell Digerakkan Remote Control Bambang Setiawan; Sulis Yulianto; Thomas Junaedi; Ilham Efendi
Prosiding Semnastek PROSIDING SEMNASTEK 2021
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Pengolahan lahan yang baik sebelum padi ditanami adalah salah satu kunci utama dari keberhasilan panen. Pengolahan lahan yang diperuntukan bagi tanaman padi sangatlah penting untuk diperhatikan. Karena lahan sawah (tanah sawah) merupakan tempat mengambil cadangan hara yang dibutuhkan bagi tanaman padi. Oleh karena itu, pertumbuhan tanaman padi diantaranya akan dipengaruhi oleh sejauh mana proses pengolahan yang dilaksanakan sebelum ditanami. Sistem pengolahan lahan sawah saat ini dilaksanakan secara tradisional dengan maupun modern. Cara tradisional menggunakan bajak, singkal, dan cangkul sedangkan cara modern menggunakan alat mekanisasi seperti traktor tangan (hand tractor). Metode pengolahan ini semua masih menggunakan sistem manual dan memerlukan waktu yang cukup banyak . Adapun pengolahan sawah dengan menggunakan traktor tangan , masih membutuhkan biaya yang cukup besar dalam pembelian bahan bakar . Adapun proses pemikiran dalam perancangan pembuatan traktor berbasis Colar cell dengan tujuan untuk hemat biaya dan hemat energi , yaitu memanfaatkan energy terbarukan dengan memanfaatkan tenaga matahari . Pengembangan traktor berbasis colar Cell , merupakan alat yang belum diciptakan oleh pihak siapapun . Nilai tertinggi yang didapatkan pada pengujian, arus tertinggi pada pukul 14.00 yaitu 14.07A, sedangkan tegangan dan daya yang dihasilkan tertinggi pada pukul 12.00 yaitu 21.10V dan 80.05W. Nilai minimal yang di peroleh adalah pada pengujian, yaitu diperoleh daya rata – rata adalah 72.56 Watt, dan lebih kecil ketimbang nilai rata – rata dari hari pengujian lainnya. Pada perhitungan teoritikal, daya yang mampu dibangkitkan oleh panel surya monocrystalline 100WP adalah 89.7 Watt dengan efisien 15% sedangkan pada output rata – rata yang mampu dihasilkan panel surya yaitu mendaptkan hasil yang berbeda antara hasil actual dan hasil teoritikal, yaitu berbeda pada selisih angka kisaran dari 4.29 Watt – 9.83 Watt. Luaran pada penelitian ini yaitu berupa mesin Traktor pengolah sawah yang berbasis Solar Cell dengan penggerak Remote Control dan Jurnal Nasional
Pembuatan Alat Bantu Khusus Penyetelan Release Lever Pada Unit Hino FM 260 JD Thomas Junaedi; Rasma Rasma; Muhamad Aqshal Pratama
Prosiding Semnastek PROSIDING SEMNASTEK 2021
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Dump Truck yang digunakan di pekerjaan kontruksi salah satunya bertipe Hino FM 260 JD yang memiliki tugas perkerjaan memindahkan material dari satu tempat ketempat lainnya, contohnya tanah, bebatuan dan material lainnya. pada saat melakukan pekerjaan GOH ( General Over Houl ) lebih tepatnya pada saat proses penyetelan Release lever pada unit Hino FM 260 JD, sering terjadi sedikit kesulitan karena belum adanya tools yang memadai sebagai penyetel Release lever, adapun tools yang digunakan saat ini hanya menggunakan Combination wrench ukuran 24mm yang seringkali mempersulit dan juga membahayakan mekanik atau man power, bukan hanya itu, tools yang saat ini digunakan juga kurang efisien terhadap waktu, dengan ini penulis melakukan penelitian serta melakukan inovasi tools penyetelan Release lever Hino FM 260 JD. Sehingga proses penyetelan Release lever menjadi lebih efisien dalam segi waktu serta mengurangi tingkat resiko pada saat penyetelan Release lever.
Study of Fluid Flow Characteristics In A 90° Pipe Bend With Varying Guide Vane Length Julian, James; Purba, Riki Hendra; Sedeq, Khalees; Wahyuni, Fitri; Junaedi, Thomas
Journal of Applied Sciences and Advanced Technology Vol. 6 No. 3 (2024): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jasat.6.3.99-108

Abstract

The influence of guide vane length and Reynolds number was investigated using computational fluid dynamics methods. By using a structured mesh, it is known that the three mesh variations used have been verified using the Richardson Extrapolation method. The validation process also showed quite good results. From this research, it can be seen from the velocity profile trend, which is close to the experimental results from previous studies. Changing the Reynolds number does not significantly change the velocity profile at the outlet bend. However, it can be seen that changes in the Reynolds number impact the fluid flow pattern produced around the pipe bend. It can be seen clearly, especially when the velocity is negative. Changing the length of the guide vane changes the flow pattern quite significantly. It is known that the shorter the guide vane used, the velocity profile will tend towards the outer core. Furthermore, using a guide vane increases the velocity profile at the position -0.3≤r/R≤ -0.06. Using a guide vane has proven to eliminate negative velocity areas on the inner core side of each variation.
Microbubble Measurements using Image Processing with the YOLOv8 Comparison Model Julian, James; Ulhaq, Faiz Daffa; Dewantara, Annastya Bagas; Purba, Riki Hendra; Wahyuni, Fitri; Junaedi, Thomas
Journal of Applied Sciences and Advanced Technology Vol. 6 No. 3 (2024): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jasat.6.3.109-116

Abstract

Gas-liquid two-phase is a situation where the gas phase of a liquid coexists together. The presence of gas that forms a region in the liquid environment causes the formation of bubble flow. The parameters of the bubble flow carry important information about the behavior and characteristics of the bubble. This research was carried out by detecting the size and area of the bubble using YOLOv8-based image processing by comparing the model's performance to produce improvements in inference time, increase accuracy, and reduce computational load. Bubble images were collected by adding 0.4 mm copper wire as a comparison to convert mm to pixels; then, the images were labeled and trained with various YOLOv8 models. Confusion matrix, precision and recall are used as comparative evaluation materials for the YOLOv8 model to obtain good model performance. In this study, the AUC of the Precision and Recall curve closest to the value 1 is the YOLOv8m model of 0.990. The comparison results of the matrix evaluation with the best model are the YOLOv8m model with mAP of 99.00% and F1-score of 96.86%. Microbubble measurements are calculated from the output of the YOLOv8 model by converting pixel units to mm. The model used in bubble measurements is the model with the best evaluation results and the model that gets the smallest radius value by considering measurement uncertainty, namely YOLOv8m with a minimum radius of 0.66 ± 0.04 mm..
Development of a Special Service Tool for Hydraulic Piston Maintenance on Excavator PC 210-10M0 Armas, Reza Febriano; Purwono, Hendro; Junaedi, Thomas; Alfauzi, Alfauzi; Santosa, Lintang Fuji
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.121-128

Abstract

Excavators are essential machinery widely utilized in mining, construction, plantation, and other industries. The Komatsu PC210-10M0, a small-sized excavator model, performs critical operations such as material digging and transportation. However, during component overhauls, particularly for the boom cylinder, bucket, and arm, significant challenges arise due to the absence of suitable tools for efficiently removing and installing hydraulic cylinder pistons. The current reliance on generic tools such as screw wrench sets (L-keys) is suboptimal, leading to inefficiencies, increased risks of workplace accidents due to tool slippage, and longer processing times. This study addresses these limitations by employing the Seven Up++ method to develop a specialized service tool specifically designed for hydraulic cylinder piston maintenance. The methodology encompasses three critical phases: Analysis, Solution, and Results, ensuring a systematic and innovation-focused approach. The developed tool securely positions itself on the piston cylinder, utilizing two pins inserted into pre-existing holes on the piston surface. The results demonstrate significant improvements: maintenance processing time is reduced by up to 70%, operational safety is enhanced due to the tool's secure attachment, and labor requirements are halved, with manpower reduced from two operators to one. These findings highlight the tool's potential to optimize maintenance operations and improve overall efficiency in the use of Komatsu PC210-10M0 excavators.
3D Model Autocad Of The Piston Displacer Cup For A Gamma Stirling Engine Using The API Method Rahmat, Rahmat; Dean Anggara Putra; Rifo Nurlaksana Restu; Jefri Imron; Marhaendra Natawibawa; Hery Sumardiyanto; Khairil Munawar; Thomas Junaedi
Elkom: Jurnal Elektronika dan Komputer Vol. 18 No. 1 (2025): Juli : Jurnal Elektronika dan Komputer
Publisher : STEKOM PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/129bk828

Abstract

When producing a perfect product, design process namely 2D modeling and 3D drawing, are closely related. The purpose of this study is to design a 3D model of a gun mastering machine product as a fan drive using CAD applications. The method of this study is decision data on API production (analytical product inspection). Measurement of sterling machine degradation using CPK (deviation) received results of -0.97, -0.22, 0.86, 0.11, 0.11 between zero and what indicates this specification. On average, the results of the stirling fluid fluorescent agent measurement are red numbers indicating that the survey dimensions are absent, especially from the basic dimensions of point 4, with samples 2, 3, and 5 exceeding the specified tolerance limits.
Project control using S Curve in provision of pedestal crane at PT. Medco E&P Natuna - West Belut Platform Rahmat, Rahmat; Putra, Dean Anggara; Restu, Rifo Nurlaksana; Imron, Jefri; Natawibawa, Marhaendra; Sumardiyanto, Hery; Munawar, Khairil; Junaedi, Thomas
Priviet Social Sciences Journal Vol. 5 No. 8 (2025): August 2025
Publisher : Privietlab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55942/pssj.v5i8.489

Abstract

In the implementation of a project, three main aspects are indicators of the success of the project: cost, schedule, and quality. If the cost and time of project implementation are in accordance with the planning and quality requirements, then the project can be said to be successful. Time plays a significant role in construction management projects, where time is also a management function. With good and proper time control, obstacles to delays in project implementation can be avoided as much as possible. The purpose of this study was to determine the cause of the achievement or deviation of work between the realization in the field and the planned time schedule for the procurement of a pedestal crane unit for a new platform in the operational area of ​​ block-B-Natuna.
Mechanical Performance of Epoxy Composite Reinforced with Wood Dust and Crumb Rubber Waste Imran, Al Ichlas; Siregar, Januar Parlaungan; Cionita, Tezara; Fitriyana, Deni Fajar; Anis, Samsudin; Dewi, Rozanna; Junaedi, Thomas; Wijayanto, Etanto Heiliano; Prayogo, Wisnu
Advance Sustainable Science Engineering and Technology Vol. 7 No. 4 (2025): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i4.2041

Abstract

The incorporation of wood dust and crumb rubber waste as filler in polymer matrix composite still requires in-depth evaluation of mechanical properties because they have different characteristics. This study evaluates the tensile, flexural, and hardness properties of epoxy composites reinforced with various fractions of wood dust and crumb rubber (5, 10, and 15%). The results showed that the composite with 5% crumb rubber produced the highest tensile strength of 15.52 MPa (CR5), while the highest flexural strength was 30.46 MPa (CR10), and the highest hardness was 75.9 HRC (CR15), indicating superior performance for CR fillers. The observations of the fracture surface showed that increasing the fraction of wood dust contributed to lowering the mechanical performance due to the relatively large distribution of voids and agglomeration. This finding confirms the importance of filler type and fraction selection on composite performance. Future research is recommended to explore filler surface modification and hybrid combinations to improve dispersion and bonding between phases in composites.
Mechanical Properties of Epoxy Composite Reinforced with Spent Coffee Ground and Coffee Husk Etanto Heiliano Wijayanto; Imran, Al Ichlas; Siregar, Januar Parlaungan; Mohd Ruzaimi Mat Rejab; Tezara Cionita; Wisnu Prayogo; Deni Fajar Fitriyana; Rozanna Dewi; Thomas Junaedi; Agustinus Purna Irawan
Advance Sustainable Science Engineering and Technology Vol. 7 No. 4 (2025): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i4.2052

Abstract

This study aims to investigate the effect of increasing the concentration of natural filler on the mechanical properties of Spent Coffee Ground (SCG) / Coffee Husk (CH) reinforced epoxy matrix composite. The materials used in this study are epoxy resin as a matrix and waste coffee grounds and coffee husks as natural fillers with sizes of 100-mesh and concentrations of 10, 20, and 30 wt.%. The results showed that SCG 10 wt.% produced the best mechanical properties compared to the other samples based on tensile strength (19.58 MPa), tensile modulus (1.70 GPa), flexural strength (44.55 MPa), and flexural modulus (2.32 GPa). On the other hand, CH 30 wt.% contributed the highest hardness value of 50.33 HRB compared to other samples. The findings in this study prove that the appropriate composition will affect the compatibility between the filler and the matrix, thus impacting the mechanical properties of the composite. This phenomenon can be seen based on microscope analysis, which shows a strong interaction between the matrix and filler and the formation of voids and agglomeration
Co-Authors Agustinus Purna Irawan Alfauzi, Alfauzi ARMAS, REZA FEBRIANO Bambang Setiawan Cionita, Tezara Dewantara, Annastya Bagas Etanto Heiliano Wijayanto Fitri Wahyuni Fitriyana, Deni Fajar Hendro Purwono Hery Sumardiyanto Ilham Efendi Imran, Al Ichlas Imron, Jefri James Julian Jefri Imron Khairil Munawar Marhaendra Natawibawa Mohd Ruzaimi Mat Rejab Muhamad Aqshal Pratama Munawar, Khairil Natawibawa, Marhaendra Prayogo, Wisnu Purba, Riki Hendra Purwono, Hendro Putra, Dean Anggara Rahmat Rahmat Rasma Rasma Rasma Rasma Rifo Nur Laksana Restu Riki Effendi Rozanna Dewi Samsudin Anis Santosa, Lintang Fuji Sedeq, Khalees Siregar, Januar Parlaungan Sulis Yulianto Sumardiyanto, Hery Tezara Cionita Ulhaq, Faiz Daffa Wijayanto, Etanto Heiliano Wisnu Prayogo