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Infotekmesin
Published by Politeknik Negeri Cilacap
ISSN : INFOTEKMES     EISSN : 26859858     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering
INFOTEKMESIN is a peer-reviewed open-access journal with e-ISSN 2685-9858 and p-ISSN: 2087-1627 published by Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Cilacap. The journal invites scientists and engineers to exchange and disseminate theoretical and practice-oriented in the various topics include, but not limited to Informatics, electrical Engineering, and mechanical Engineering.
Arjuna Subject : -
Articles 669 Documents
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Analisa Tegangan dan Deformasi Pada Desain Kursi Menggunakan Finite Element Method Dengan Variasi Pembebanan Sugiono, Didik; Suprapto, Suprapto; Rahmad Aldori, Yopan; Supardi, Supardi
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2807

Abstract

The manufacturing process is an activity of processing raw materials into products to increase added value. One of these products is chair furniture; to reduce errors and failures in its manufacture, it is necessary to do prototype model experiments first. This research conducts a simulation study and analysis of the chair design on stress, deformation and safety factor using the Finite Element Method approach with the help of ANSYS ADPL 18.0 static structural software where the chair design is made of 304 stainless steel, aluminum-T6, HCP 30 polymer foam in one chair structure by simulating several static load loading scenarios, boundary conditions, and even distribution on the surface of the chair. The simulation results show that the highest maximum stress distribution (von misses stress) is 3.5 Mpa at a pressure of 175 kg.f, for the lowest value of 1.5 Mpa at a pressure of 5 Kg.f and a deformation (displacement) of 0.145x10ˉ4 mm occurs at a pressure of 175 Kg.f, while the lowest deformation value of 0.621x10ˉ5 occurs at a pressure of 75 Kg.f, This is due to the loading increasing along with the applied pressure force, but still in the minimum safety factor standard position for static loads, so as not to damage the geometric structure.
Pemanfaatan Algoritma Random Forest Regression dalam Memprediksi Kepuasan Mahasiswa Terhadap Dosen Listyaningrum, Rostika; Purwanto, Riyadi; Dwi Novia Prasetyanti; Cahya Vikasari; Artdhita Fajar Pratiwi
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2808

Abstract

Student satisfaction with lecturers is a key indicator in assessing the quality of higher education. However, commonly used evaluation approaches remain largely descriptive and subjective, making them less effective in supporting sustainable quality improvement. Moreover, the comprehensive use of lecturer competency indicators in predictive models is still limited. This study addresses the gap by developing a student satisfaction prediction model using the Random Forest Regression algorithm, optimized through grid search and feature selection using the Recursive Feature Elimination (RFE) method combined with 5-fold cross-validation. Data were collected from the EDOM system of Politeknik Negeri Cilacap, involving 24 indicators based on national lecturer competency standards, and analyzed using R software. The best model was achieved with parameters mtry = 1 and ntree = 300, yielding RMSE = 0.0222, MAE = 0.0118, and R² = 0.9959. The three most influential indicators identified were structured assignments, diversity of teaching methods, and punctuality. These findings are expected to inform policies for improving the quality of higher education.
Kombinasi Algoritma TF-IDF dan Weighted Dice Similarity untuk Pengukuran Kemiripan Judul Tugas Akhir Purwaningrum, Santi; Susanto, Agus; Setiawan Prabowo , Annas
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2812

Abstract

The high similarity rate among undergraduate thesis titles has become a critical issue in maintaining the originality of academic work within higher education institutions. This study aims to develop an automated system for detecting title similarity by combining the Term Frequency–Inverse Document Frequency (TF-IDF) algorithm with the Weighted Dice Similarity method. TF-IDF is used to assign weights to important words in the titles, while Weighted Dice Similarity measures the degree of similarity between titles based on the distribution and weights of these words. The study utilizes a dataset of 200 manually annotated thesis titles as ground truth. The analysis process includes preprocessing, word weighting, and similarity computation between titles. Experimental results show that the system achieves an accuracy of 94%, a precision of 66.67%, a recall of 81.3%, and an average Weighted Dice similarity score of 0.62. Although the precision score is relatively moderate, the combination of both methods is considered effective, as it captures both lexical structure and semantic similarity, capabilities that are not fully achieved when using a single method alone
Uji Performa Engine Fuel Injection Berbahan Bakar Gasoline-Butanol dan Gasoline-Ethanol Sanjaya, Firman Lukman; Fatkhurrozak, Faqih; Syarifudin, Syarifudin; Usman , M. Khumaidi; Budhi Hendrawan, Andre
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2814

Abstract

The energy crisis is largely attributed to the extensive use of fossil fuels. Butanol and ethanol can be used as an alternative energy source because their characteristics are superior to those of gasoline, such as RON and oxygen content. This study aims to determine the effect of gasoline-butanol and gasoline-ethanol mixtures on engine performance so that they can be an option to replace fossil fuels. The percentage of alcohol (butanol and ethanol) in gasoline is 5%, 10%, and 15% with variations in engine speed of 1000, 2000, and 3000 rpm. This study uses a dynamometer as a tool to measure engine performance. Test results show that E15 can increase engine torque and power by up to 26%, while B15 increases by 19%. In addition, ethanol can reduce BSFC better than butanol. The BSFC value decreased by 17% in E15, while B15 decreased by 15% compared to pure gasoline. This is because ethanol's RON and oxygen content are higher, so torque and power increase while BSFC decreases. These results prove that gasoline-ethanol is better at improving engine performance than gasoline-butanol.
Sistem Pengawasan Perilaku Pengemudi Berbasis IoT Dengan Pemanfaatan LiDAR dan GPS Untuk Meningkatkan Keselamatan Berkendara Wibowo, Helmi; Faza Asfarin Ajrun Adhim
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2823

Abstract

In 2022, a total of 139,258 traffic accidents occurred in Indonesia, encompassing all types of incidents, from minor to fatal. The high number of accidents, particularly those caused by speeding and unsafe following distances, highlights the need for a system capable of automatically monitoring and intervening in driver behavior. This study aims to develop an IoT-based control and monitoring system that not only detects violations such as overspeeding and insufficient following distance but also provides direct intervention in vehicle speed. The system utilizes an Arduino Mega and ESP32, equipped with GPS and LiDAR sensors, along with a DAC output to limit the accelerator pedal voltage when repeated violations are detected. Testing was conducted to evaluate sensor accuracy, IoT performance, and the effectiveness of speed intervention. The results showed a 100% success rate in five speed intervention tests, good sensor accuracy, and IoT notifications successfully delivered with an average delay of 5.9 seconds. The system proved to be effective and feasible as a technology-based solution to enhance driving safety.
Pengaruh Suhu Pemanas Pada Mesin Pengering Cocopeat Tipe Rotary Dryer Jati, Unggul Satria; Nur Akhlis Sarihidaya Laksana; Prabowo, Dian; Wardani, Nur Indah; Kurniyanto, Prastiyo; Fauzi, Bryan Dwi
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2833

Abstract

The rotary dryer is a machine designed to simplify the cocopeat drying process. The current process still relies on sunlight; this drying process has the drawback of longer drying times and uncontrolled moisture content. The maximum moisture content of the cocopeat must be 15%. This research method is an experiment using several parameters: a drum speed of 6 rpm, heating temperatures of 600°C, 900°C, and 1300°C, with varying drying times of 120 and 150 minutes. The drying process at a temperature of 600 °C resulted in a decrease in humidity efficiency of up to 56.7% with a water content value of 23.8% in 150 minutes and a mass of 3.7 kg. Meanwhile, for drying at a temperature of 1300 °C, the best reduction in efficiency was obtained compared to the previous temperature, a decrease in water content of up to 84% with a water content value of 8.55 and a mass of 2.7 kg using a time of 150 minutes.
Design and Implementation of a 3-Phase Induction Motor Controller Simulator Using Programmable Logic Controller (PLC) and Human Machine Interface (HMI) Integration Priyanto, Kaleb; Sudjana, Immanuel Eltian; Almay, Hans Nashirudin; Kriswanto; Haikal; Enita, Sarai
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.2750

Abstract

This study was conducted as a response to the limited availability of practical learning tools in industrial automation education and training. In this research, a three-phase induction motor control simulator was designed and developed by integrating a Programmable Logic Controller (PLC) and Human Machine Interface (HMI) system. The main objective is to enhance learners' understanding and practical skills in designing and operating industrial control and automation systems through an interactive learning approach. The development process involved designing the system architecture using an Omron CP2E PLC and NB-series HMI, electrical integration, ladder diagram programming, and user interface development. The simulator was then tested to ensure its proper functionality and effectiveness in supporting the learning process. The results demonstrate successful system integration, reliable control logic, and an intuitive user interface via the HMI. This research contributes a structured and cost-effective educational tool that is well-suited for automation engineering and technical training programs.
Rancang Bangun Jig & Fixture Pemesinan Computer Numerical Control (CNC) Milling Dengan Area Kerja 300x300mm Ariyanto, Nur Aidi; Budi, Sigit Setijo
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.2849

Abstract

Limitations in machining accuracy and efficiency on CNC milling machines with a 300 × 300 mm working area are often caused by the use of general-purpose jig and fixture (J&F) designs that are not tailored to the characteristics of the machine and workpiece. This condition can lead to vibration, dimensional errors, and inefficient use of time and material. The research gap addressed in this study lies in the limited availability of systematic jig and fixture designs for CNC milling machines with restricted working areas. This research aims to design a jig and fixture compatible with a 300 × 300 mm CNC milling machine to improve clamping stability, machining accuracy, and process efficiency. The VDI 2222 design methodology is applied through four stages: planning, conceptualization, design, and completion, supported by Computer-Aided Design (CAD). Two design alternatives are evaluated, and the optimal concept is selected based on clamping stability criteria. The results are a final jig and fixture design and detailed engineering drawings ready for prototype fabrication, suitable for small-scale CNC milling machines.
Rancang Bangun Alat Estimasi Nilai Lumen Lampu Berbasis Internet of Things dengan Aplikasi Android Blynk Ardiansah, Feri; Prasetia, Vicky; Susanti, Hera; Rafiq, Arif Ainur; Riyanto, Sugeng Dwi
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.2867

Abstract

The development of lighting technology, particularly LED lamps, drives the need for light intensity testing (lumen) to ensure quality and energy efficiency. The SNI IEC 62612:2016 standard establishes testing parameters that must be met, but field testing processes are still largely manual and inefficient. This research aims to design and realize an Internet of Things (IoT)-based lamp lumen value testing tool with results displayed on an Android application as a practical and automated solution. The tool is designed according to the SNI IEC 62612:2016 standard, equipped with a BH1750 sensor to measure light intensity (lux), a PZEM-004T sensor to measure voltage and current, and an MLX90614 sensor to measure lamp surface temperature. The testing process is performed automatically using a NodeMCU ESP32 microcontroller, with measurement results displayed on a 20x4 LCD and transmitted to the Blynk application on Android in real-time. Testing on 16 LED lamp samples from various brands and powers showed that the system has high accuracy with average BH1750 sensor accuracy of 98.78%, MLX90614 sensor accuracy of 99.74%, PZEM-004T sensor accuracy for voltage of 99.9% and current 100%, as well as error-free data transmission to Android applications. This tool successfully performs lumen testing automatically, accurately, and efficiently according to national standards.
Prototipe Stasiun Penukaran Baterai Kendaraan Listrik Umum (SPBKLU) Ringan Berbasis Energi Surya untuk Sepeda Listrik Richad Syahputra Sihombing; Asri, Rishal; Rihardian Maulana Wicaksono; Guna Bangun Persada; Koko Friansa
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.2876

Abstract

The transition to electric vehicles in Indonesia continues to progress, along with increasing awareness of the importance of reducing emissions and utilizing renewable energy. One of the challenges still faced is the limited infrastructure for charging and battery swapping. This study designed a battery charging system using two 100Wp solar panels connected in parallel to increase the charging current, and a Maximum Power Point Tracking solar charge controller to regulate the input current to the battery. Tests were conducted on three variations of battery capacity, namely one battery (12 Ah), two batteries (24 Ah), and four batteries (48 Ah), to evaluate the efficiency and charging time of the batteries. The results showed that the charging time for each variation ranged from 3 to 6 hours, depending on the number of batteries and solar irradiation conditions. The designed lightweight Public Electric Vehicle Battery Charging System (SPBKLU) proved to be a sustainable emergency solution for battery charging using renewable energy sources.

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