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Afdhal Kurniawan Mainil
Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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ANALISA KEKUATAN STRUKTUR WALKING BEAM PADA SUCKER ROD PUMP MENGGUNAKAN METODE SIMULASI NUMERIK FINITE ELEMENT ANALYSIS Nanda; Supardi, Nurul Iman; Mainil, Afdhal Kurniawan; Winata, Alben Sindhu
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2025): April 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i1.40639

Abstract

Sucker rod pump are a technology that has been used for a long time in the petroleum mining industry and proven effective in lifting oil from wells that have low flow rates. One of the companies in Indonesia which still produces Sucker Rod Pump is PT. Bukaka Engineering Utama Tbk. Sucker Rod Pump is a tool that used to raise petroleum from the well to the ground surface. In a Sucker Rod Pump there are several main components, namely the Walking Beam, Horse Head, Samson Post, Crank, Counter Weight, Pitman, Equalizer, Gear Box, electric motor and V-Belt. Walking Beam is a very component has a big influence on the performance of the Pumping Unit, in this case Walking The beam on the Pumping Unit must be appropriate in terms of strength, durability and... security, this is intended to obtain effective, maximum performance. On During the design process, the Walking Beam was designed using software solidworks 2024. The material used is ASTM A36 Steel Plate, with dimensions 5000mm long, 617mm high and 200mm wide. This Walking Beam analyzed using Solidworks 2024 Software. In the Von Misses stress test, it is obtained The maximum stress result is 76,756 MPa. While the minimum voltage found on the base plate is 0.222 Mpa. For the results of the simulation The maximum displacement value obtained is 2,550 mm for color red and a minimum displacement of 41.498 mm which is indicated by blue. Lastly, safety factor testing was carried out where the results were obtained The maximum safety factor is 1,126.43 on the base plate. Meanwhile numbers The minimum security is in the blue section, namely 0.003. From the results analysis obtained, it can be seen that the Walking Beam was used it's not safe. In the analysis process the author only uses value obtained from calculating the lifting force, object mass, well volume, and the weight of the load used (ignoring the weight of the Equlizer, Pitman, Crank, and power from the gear reducer). This is done to find out what are the conditions when the Walking Beam is operating to lift fluid from At the bottom of the well then there was a problem with the drive motor.
Comparative Study of Deep Learning Models to Classify of Multi-Class Skin Cancer on Imbalanced Data Oktoeberza, Widhia KZ; Rahman, Muhammad Farchan Al; Vasiguhamiaz, Azvadennys; Huda, Widya Nurul; Mainil, Afdhal Kurniawan; Sari, Julia Purnama
Jurnal Nasional Pendidikan Teknik Informatika: JANAPATI Vol. 14 No. 2 (2025)
Publisher : Prodi Pendidikan Teknik Informatika Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/janapati.v14i2.85544

Abstract

Skin cancer diagnosis faces challenges in efficiency and accuracy. This research addresses the need for improved non-invasive diagnostic tools by leveraging deep learning for multi-class skin cancer classification from dermoscopic images. A key focus is overcoming the limitations of imbalanced datasets, common in medical imaging, which can hinder model performance. We propose an optimal strategy utilizing a Convolutional Neural Network (CNN) transfer learning methodology. The process involves CNN-based segmentation to isolate relevant regions, followed by feature extraction and classification. We comparatively evaluated three pre-trained transfer learning techniques: DenseNet201, ResNet50, and VGG16, using the HAM10000 dataset (10,015 images across seven skin cancer classes). To mitigate severe class imbalance, Random Oversampling was employed, chosen for its simplicity and effectiveness in balancing the dataset and enhancing model generalization. Model performance was rigorously evaluated using accuracy, precision, recall, and F1-score. DenseNet201 consistently achieved superior performance, with an accuracy of 97% post-oversampling. It also exhibited the highest precision, recall, and F1-score across all models, confirming its effectiveness in classifying both majority and minority classes. Compared to previous studies on HAM10000, our DenseNet201 model's test accuracy of 96.52% is competitive or superior to reported accuracy of 90-92%. This highlights the synergistic effect of DenseNet201's efficient feature reuse and robust data balancing. This research provides a robust framework for advanced methodologies in skin cancer classification, particularly for imbalanced medical image datasets.
Experimental study on a laboratory-scale archimedes screw turbine using pitch-to-diameter ratio for low-head hydropower Helmizar Helmizar; Nurcholish Windiharto; Yovan Witanto; Afdhal Kurniawan Mainil; Rahmat Iman Mainil; Khotso Sai
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6690

Abstract

The Archimedes screw is a hydropower technology well-suited for low-head applications This study investigates the performance of a laboratory-scale Archimedes screw turbine for low-head hydropower applications by varying pitch-to-diameter ratio (P/D = 0.3, 0.38, 0.45, 0.52) and inclination angle (β = 22°, 25°, 27°). Experiments were conducted in a controlled water flow environment to evaluate torque, power output, and efficiency at different rotational speeds. Results indicate that both P/D and β significantly influence energy conversion. The highest performance was achieved at P/D = 0.45 and β = 22°, producing a peak torque of 0.36 Nm, a power output of 2.4 W, and a maximum efficiency of 52.37%. Lower inclination angles contributed to improved hydraulic energy capture due to better water filling and reduced slippage. These findings highlight the importance of optimizing geometric parameters to enhance turbine performance in small-scale, sustainable energy systems. The results offer design guidance for implementing Archimedes screw turbines in rural or off-grid low-head hydropower scenarios.
PREVENTIVE MAINTENANCE CLOSED COOLING WATER PUMP TURBINE PADA PLTU PRIAMANAYA ENERGI KEBAN AGUNG LAHAT 2 X 135 MW Satria, Miko; Nuramal, Agus; Mainil, Afdhal Kurniawan; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 2 (2025): Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i2.39688

Abstract

Preventive maintenance is a maintenance and care activity carried out to prevent unexpected damage and to find conditions or circumstances that can cause production facilities to experience damage during the production process. The purpose of the research conducted by the author is to determine the implementation of preventive maintenance on the closed cooling water pump turbine at the Priamanaya Energi Keban Agung Lahat 2 x 135 MW PLTU, this research was conducted using the observation method or going directly to the field. This research resulted in that by carrying out preventive maintenance regularly and effectively on the closed cooling water pump at this PLTU, the company can ensure that they not only maintain smooth and efficient operations, but also reduce the risk of damage that can disrupt production.
CNN-Based for Skin Cancer Classification with Dull Razor Filtering and SMOTE Widhia Oktoeberza KZ; Wahyu Dwi Prasetio; Adam Idham Ramadhan; Adde Nanda C. Putra; Firsti Eliora; Afdhal Kurniawan Mainil; Agus Susanto
Telematika Vol 18, No 1: February (2025)
Publisher : Universitas Amikom Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35671/telematika.v18i1.3048

Abstract

Skin cancer is usually diagnosed by dermatologists through biopsy, which can be a time-consuming process due to limited resources. Early detection of skin cancer can increase the survival rate to over 99%, but if it's detected late, the rate drops to around 14%. This finding highlights the need for a rapid and accurate computing system for early cancer detection, which can prevent severe consequences. The purpose of this study is to classify skin cancer images into benign and malignant classes based on their nature. To facilitate the classification of CNN-based skin cancer, this research employs dull razor filtering. Additionally, the SMOTE method handles the unbalanced dataset. The classification results indicate that the proposed approach has an accuracy of 88.54%, a precision of 88%, and a sensitivity of 88%. These findings suggest that CNN-based methods can aid dermatologists in the diagnosis of skin cancer.
Experimental study of screw number effects on Archimedes screw turbine performance for low-head microhydropower Helmizar Helmizar; Sulistriyono Sulistriyono; Khotso Sai; Ahmad Fuad Ab Ghani; Afdhal Kurniawan Mainil
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i5.8851

Abstract

The increasing need for sustainable energy has prompted the development of small-scale hydropower technologies for low-head conditions in remote areas. This study experimentally examined the effect of screw number on the performance of an Archimedes Screw Turbine (AST) under identical laboratory conditions. Three configurations, namely single-, double-, and triple-screw turbines, were tested at the same hydraulic head, flow discharge, and inclination angle. Torque and rotational speed were measured using load cells and tachometers, while turbine performance was evaluated based on output power and efficiency. The results showed that increasing the number of screws improved turbine performance under the tested conditions. The triple-screw configuration produced a maximum torque of 0.54 Nm at 60 rpm and a maximum output power of 4.64 W with an efficiency of 55% at 120 rpm. The double- and single-screw configurations showed lower performance across the tested operating conditions. The improved performance of the triple-screw configuration was associated with greater water containment and momentum transfer. These findings indicate that screw number is an important design parameter for AST performance under low-head conditions. Among the configurations investigated, the triple-screw turbine provided the highest efficiency and output power and a wider operating range. Further investigation is required to determine whether increasing the screw number beyond three provides additional performance benefits under different hydraulic conditions.
TINGKAT KEHALUSAN DAN NOMOR BUTIR SERBUK BIOKERAMIK MENGGUNAKAN AYAKAN GETAR Hendri Van Hoten; Nurbaiti; Afdhal Kurniawan Mainil
Jurnal Sains dan Teknologi Vol 19 No 2 (2020): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik - Universitas Riau

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Abstract

Penelitian ini telah dilakukan untuk mendapatkan tingkat kehalusan dan nomor butir Serbuk Biokeramik Menggunakan Ayakan Getar. Bahan baku Biokeramik tersebut di proses terlebih dahulu menggunakan mesin Ball Mill dengan memvariasikan kecepatan dan waktu proses penggilingan serta nilai rasio massa serbuk terhadap massa bola penggiling atau Ball Powder Ratio (BPR). Untuk menentukan tingkat kehalusan dan nomor butir serbuk menggunakan mesin ayakan getar. Nomor ayakan yang digunakan adalah 35, 60, 120 serta 230 dengan tingkat kehalusan ukuran masing-masing sieve 500, 250, 125 dan 63 µm secara berturut-turut. Ukuran dari serbuk biokeramik dari cangkang telur masih dalam range mikrometer. Ukuran serbuk terkecil didapatkan pada kecepatan penggilingan 150 rpm, waktu penggilingan 1 jam serta BPR 1:6 yaitu 86,5 m. Pada parameter ini nomor butir serbuknya yaitu 191.
KONDISI KERJA MESIN REFRIGERASI KOMPRESI UAP PADA VARIASI MASSA REFRIGERAN HIDROKARBON Rahmat Iman Mainil; Nurul Deswita; Afdhal Kurniawan Mainil; Azridjal Aziz
Jurnal Sains dan Teknologi Vol 19 No 2 (2020): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik - Universitas Riau

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Abstract

Salah satu penentu kinerja mesin kompresi uap adalah massa refrigeran. Kinerja mesin refrigerasi dapat dinilai pada kondisi kerja sistem meliputi temperatur kotak pendingin, temperatur kerja kondensor dan evaporator, tekanan kerja kondensor dan evaporator, dan daya kompresor pada variasi massa refrigeran yang ditetapkan. Untuk menganalisa kondisi kerja tersebut, mesin refrigerasi kompresi uap diisi menggunakan refrigeran HCR-134a dengan variasi massa 60-220 gram. Hasil pengujian menunjukkan bahwa untuk seluruh variasi massa refrigeran, temperatur kotak pendingin dapat turun terhadap waktu operasi dimana rata-rata penurunan temperatur adalah 7 ºC. Tekanan evaporator dan tekanan kondensor meningkat dengan meningkatnya jumlah massa refrigeran yang diisi kedalam sistem, mengakibatkan semakin meningkatnya kerja kompresor. Kenaikan daya kompresor pada setiap massa refrigeran rata-rata sebesar 0,016 kW.
KOMPARASI KINERJA REFRIGERATOR DENGAN REFRIGERAN HIDROKARBON HCR134a ALTENATIF PENGGANTI R134a PADA PANJANG PIPA KAPILER 1,25 m Azridjal Aziz; Izzuddin Ali Raja Siregar; Rahmat Iman Mainil; Afdhal Kurniawan Mainil
Jurnal Sains dan Teknologi Vol 19 No 2 (2020): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik - Universitas Riau

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Abstract

Pada penelitian ini telah dilakukan uji komparasi mesin pendingin siklus kompresi uap dengan fluida kerja HCR134a (refrigeran hidrokarbon pengganti R134a) dan fluida kerja R134a yang beroperasi pada panjang pipa kapiler 1,25m dengan pendinginan udara. Analisisis dilakukan terhadap pengaruh tekanan dan temperatur, arus listrik, kerja kompresi, dan koefisien perfomansi (COP) alat uji. Hasil penelitian menunjukkan, penggunaan HCR134a meningkatkan COP sebesar 29.92% dengan penggunaan arus listrik lebih rendah 10.8% dibandingkan dengan R134a. Dari uji komparasi dapat disimpulkan bahwa penggunaan refrigeran hidrokrabon (HCR134a) memberikan kinerja yang lebih baik dan lebih hemat energi dibanding refrigeran halokarbon (R134a).
PENGARUH BEBAN PENDINGIN PADA MESIN PENKONDISIAN UDARA HIBRIDA DENGAN KONDENSOR DUMMY TIPE MULTI HELICAL COIL SEBAGAI WATER HEATER Afdhal Kurniawan Mainil; Sarwo Fikri; Azridjal Aziz
Jurnal Sains dan Teknologi Vol 17 No 2 (2018): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik - Universitas Riau

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Abstract

Air conditioning machines are generally used to provide a cooling effect. The cooling effect is intended to provide comfortable zone in a cooled room, so that a sense of comfort makes people feel at home in it. Most air conditioning machines operate thermodynamically using a vapor compression cycle, where heat is absorbed inside of the evaporator in the room, then this heat is discharged in an outdoor condenser. This process can take place because of the compressor's work and the pressure drop that occurs in the expansion valve or capillary pipe, so that the vapor compression cycle works perfectly. In air conditioning systems usually heat is wasted useless, the heat can be used to heat water with the addition of a dummy condenser. The addition of a dummy condenser in this study was conducted to see the effect of adding a dummy condenser to cooling load, compression power, temperature, and the Coefficient of Performance (COP). The method used in this study is the design and experimental methods. Based on the results of the test, during the 120 minute operation the hot water temperature achieved at no load conditions (0W), 1000W, 2000W and 3000W loads are 52.83oC, 56.58oC, 57.93oC and 64.73oC, respectively.
Co-Authors Adam Idham Ramadhan Adde Nanda C. Putra Adi Hans Purba Agus Nuramal Agus Susanto Ahmad Fauzan Suryono Ahmad Fuad Ab Ghani Aulian Samri Azridjal Aziz Dani Ikhsan Putra Dri Asmawanti-s Faisal Afif Fauzan Andreas Fauzan Andreas Firsti Eliora Gusta Gunawan Helmizar Helmizar - Hendri van Hoten Heni Nopianti Huda, Widya Nurul Ida Ayu Putu Sri Widnyani Izzuddin Ali Raja Siregar Izzudin Ali Raja Siregar Julia Purnama Sari Khotso Sai Khotso Sai M Akmal Muhammad Faizal Syukrillah Nanda Nurbaiti Nurbaiti Nurbaiti Nurbaiti Nurcholish Windiharto Nurul Deswita Nurul Deswita Nurul Iman Supardi Oktoeberza, Widhia KZ Permadi, Agung Imam Rahman, Muhammad Farchan Al Rahmat Iman Mainil Renhard Niptro Gultom Sarwo Fikri Sarwo Fikri Satria, Miko Sayfri Syafri Silitonga, Jhonson Van Sulistriyono Sulistriyono Syafri ' Vasiguhamiaz, Azvadennys Wahyu Dwi Prasetio Wandi Wahyudi Widhia Oktoeberza KZ Winata, Alben Sindhu Yovan Witanto