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All Journal JURNAL TEKNIK MESIN Majalah Ilmiah MOMENTUM Vocatech : Vocational Education and Technology Journal Jurnal Mekanik Terapan Jurnal Pengabdian Masyarakat Bangsa Jurnal Polimesin Recent in Engineering Science and Technology
Maladzi, Radhi
Politeknik Negeri Jakarta
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Analisis Kerusakan Bantalan Gelinding Dengan Variasi Kecepatan Putar Berdasarkan Pola Getaran Menggunakan Metoda Envelope Analysis Radhi Maladzi; Toni Prahasto; Achmad Widodo
JURNAL TEKNIK MESIN Vol 5, No 1 (2017): VOLUME 5, NOMOR 1, JANUARI 2017
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (755.216 KB)

Abstract

Bantalan gelinding merupakan salah satu elemen mesin yang memiliki peran penting pada mesin di mana memiliki fungsi untuk mengurangi besarnya gaya gesek yang ditimbulkan oleh poros saat berputar. Sehingga  kegagalannya menjadi alasan yang paling umum untuk mesin mengalami kerusakan. Jenis kerusakan yang terjadi pada bantalan gelinding meliputi, kerusakan lintasan luar, kerusakan lintasan dalam, kerusakan elemen gelinding, dan kerusakan kombinasi. Pada makalah ini, deteksi kerusakan bantalan gelinding bagian lintasan luar, lintasan dalam, elemen gelinding, atau juga kerusakan kombinasi akan dikaji berdasarkan sinyal getaran. Namun sinyal getaran yang dihasilkan merupakan sinyal modulasi, oleh karena itu diperlukan metoda Analisis envelope untuk mengekstrak informasi dari sinyal modulasi. Analisis sinyal getaran  domain frekuensi setelah dilakukannya Analisis envelope menjadi dasar utama. Pola-pola sinyal hasil getaran dianalisis melalui plot fitur sinyal getaran, kemudian dibandingkan antara kondisi bantalan gelinding normal dan bantalan gelinding yang mengalami kerusakan sebagaimana disebutkan di atas. Dengan cara perbandingan fitur sinyal getaran tersebut, maka deteksi kerusakan bantalan gelinding dapat dilakukan.
Instalasi Sistem Penyiraman Tanaman Untuk Taman Poly Sekar Asri Perumahan Politeknik Negeri Jakarta (PNJ) Silitonga, Muhammad Prasha Risfi; Khoirunnisa, Ratna; Saidatuningtyas, Ifa; Yudisha, Nabila; Hidayati, Noor; Matsaany, Bayun; Maladzi, Radhi
Jurnal Pengabdian Masyarakat Bangsa Vol. 2 No. 4 (2024): Juni
Publisher : Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/jpmba.v2i4.982

Abstract

Kegiatan pengabdian kepada masyarakat ini akan menjadikan taman Poly Sekar Asri yang terletak di perumahan Politeknik Negeri Jakarta seperti target obyeknya. Diharapkan pengabdian ini dapat mengembangkan taman sehingga tetap subur dan memiliki manfaat yang tetap terjaga. Pengabdian kepada masyarakat ini diusulkan dengan konsep “Instalasi Sistem Penyiraman Tanaman untuk Taman Poly Sekar Asri Perumahan Politeknik Negeri Jakarta”. Berdasarkan konsep tersebut, maka tujuan utamanya adalah melakukan pengabdian kepada masyarakat sebagai syarat Tri Dharma Perguruan Tinggi. Secara khusus, tujuan lainnya adalah membuat sistem instalasi penyiraman tanaman pada taman tersebut, sehingga terjaga kelestatrian dan kebermanfaatannya. Kegiatan ini diawali dengan melakukan riset berupa survey ke taman tersebut. Masalah yang muncul adalah luasnya lahan yang perlu disiram. Data tersebut dijadikan dasar bahwa perlu adanya sistem pengairan yang mudah, tetapi dapat mencakup seluruh area taman. Hasil kegiatan pengabdian masyarakat ini adalah peralatan pompa, sistem penyiraman tanaman, dan pelatihan penggunaan alat dan cara perawatannya, sehingga dapat digunakan oleh masyarakat sekitar taman. Pengabdian ini diharapkan dapat memudahkan masyarakat melakukan penyiraman pada taman tersebut dan meningkatkan kualitas dari taman Poly Sekar Asri tersebut.
Enhancing Proton Exchange Membrane Fuel Cell (PEMFC) Performance through Optimized Design of Parallel Channel Bipolar Plates Moh Nurkhamal; Rizkia, Vika; Vina Nanda Garjati; Radhi Maladzi
Recent in Engineering Science and Technology Vol. 3 No. 01 (2025): RiESTech Volume 03 No. 01 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i01.94

Abstract

In this modern era, the demand for efficient and environmentally friendly energy sources is increasing. One technology with significant potential to meet this demand is the Proton Exchange Membrane Fuel Cell (PEMFC). This study aims to investigate the influence of channel width and depth variations in parallel bipolar plate designs on PEMFC performance. Computational Fluid Dynamics (CFD) was employed to analyze hydrogen flow distribution and pressure across various design variations. The results demonstrate that channel width and depth significantly affect pressure distribution and flow velocity, which in turn influence the efficiency of the PEMFC system. Increasing channel width generally reduces maximum pressure, while deeper channels help to distribute pressure more evenly across the bipolar plate. Optimized channel width and depth can enhance PEMFC operational performance by reducing pressure drop and promoting uniform flow distribution.
Design and development of a solar energy-based egg incubator using the quality function deployment (QFD) method with an automatic sliding rack Silitonga, Muhammad Prasha Risfi; Muklas, Muchamad Wali; Prakoso, Muhammad Azhar; Adhi, Pribadi Mumpuni; Maladzi, Radhi
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7541

Abstract

This research focuses on the design and development of a solar-powered egg incubator specifically for free-range chickens, incorporating an automated sliding rack mechanism. One of the main issues encountered by poultry farmers is the inconsistency of electricity supply and the uneven distribution of heat within conventional incubators, both of which contribute to low hatch rates. To address this, the study employed the Quality Function Deployment (QFD) methodology alongside the House of Quality (HOQ) framework to systematically convert user requirements into engineering specifications. Primary data were gathered through Focus Group Discussions (FGD) with poultry practitioners, followed by experimental evaluations concerning thermal distribution performance and the reliability of the solar-powered backup system. Findings demonstrate that the integration of the automated rack and solar panel system resulted in a full (100%) hatching rate, with a stable incubation temperature maintained within the optimal range of 37 to 40°C. Additionally, the solar energy system ensured uninterrupted operation for approximately 7 hours in the event of a power outage. This technological innovation offers a sustainable, eco-friendly solution that holds the potential to significantly boost the productivity of local poultry farming.
Analisis Pengaruh Parameter Mesin Cnc Laser Cutting terhadap Waktu dan Akurasi Dimensi Maladzi, Radhi; Putra, Rama Ardiansyah; Matsaany, Bayun; Yudisha, Nabila
VOCATECH: Vocational Education and Technology Journal Vol 7, No 2 (2025): December
Publisher : Akademi Komunitas Negeri Aceh Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38038/vocatech.v7i2.257

Abstract

AbstractThe manufacturing industry plays a vital role in supporting economic growth but often faces operational inefficiencies, particularly in the production process. PT XYZ, a leading steel manufacturing company in Indonesia, utilizes a CNC laser cutting machine model 3015H to produce components made from SS400 material. A high defect rate in cutting 2 mm thick SS400 plates indicates inefficiencies that require further investigation. This study aims to analyze the effects of cutting speed, laser height distance, and gas pressure on cutting time efficiency and dimensional accuracy. The research employs the Taguchi method for experimental design, Grey Relational Analysis (GRA) for multi-response optimization, and MANOVA to determine the simultaneous significance of the process parameters. The results show that the optimal parameter combination for cutting time and dimensional accuracy is achieved at a cutting speed of 1.8 m/min, a laser height of 0.8 mm, and a gas pressure of 0.8 bar. Cutting speed was the most dominant factor affecting cutting time efficiency, with the fastest time recorded at 25.26 seconds and the highest delta value. Gas pressure had the most significant effect on dimensional accuracy, producing the smallest deviation of 0.0567 mm. MANOVA results indicated that all three parameters had a significant multivariate effect (p 0.05), but only cutting time was significantly affected in the univariate test. In conclusion, proper process parameter settings can enhance cutting efficiency without compromising accuracy. These findings are expected to support technical decision-making to improve productivity at PT XYZ.Keywords:cnc laser cutting; ss400; taguchi; grey relational analysis; manova  AbstrakIndustri manufaktur merupakan sektor penting yang menopang pertumbuhan ekonomi, namun dalam praktiknya sering menghadapi tantangan berupa ketidakefisienan operasional, khususnya dalam proses produksi. PT XYZ sebagai perusahaan produsen baja terkemuka di Indonesia menggunakan mesin CNC laser cutting tipe 3015H dalam produksi produk berbahan SS400. Tingginya tingkat cacat pada proses pemotongan material SS400 ketebalan 2 mm menunjukkan adanya ketidakefisienan yang perlu diteliti lebih lanjut. Penelitian ini bertujuan untuk menganalisis pengaruh parameter proses kecepatan potong, jarak ketinggian laser, dan tekanan gas terhadap efisiensi waktu dan akurasi dimensi hasil potongan. Penelitian menggunakan metode Taguchi untuk desain eksperimen, grey relational analysis (GRA) untuk optimasi multi-respon, dan uji MANOVA untuk mengetahui signifikansi pengaruh secara simultan. Hasil penelitian menunjukkan bahwa kombinasi parameter optimal untuk waktu pemotongan dan akurasi dimensi, yaitu pada kecepatan potong 1,8 m/min, jarak ketinggian laser 0,8 mm dan tekanan gas 0,8 bar. Kecepatan potong merupakan faktor paling dominan terhadap efisiensi waktu, ditunjukkan oleh waktu tercepat sebesar 25,26 detik dan nilai delta tertinggi. Sedangkan tekanan gas paling berpengaruh terhadap akurasi dimensi, dengan selisih terkecil sebesar 0,0567 mm. Uji MANOVA menunjukkan ketiga parameter berpengaruh signifikan terhadap gabungan variabel dependen secara multivariat (p 0,05), namun hanya signifikan terhadap efisiensi waktu secara univariat. Dapat disimpulkan bahwa pengaturan parameter proses yang tepat dapat meningkatkan efisiensi pemotongan tanpa mengorbankan akurasi. Hasil ini diharapkan dapat menjadi dasar pengambilan keputusan teknis dalam meningkatkan produktivitas PT XYZ.Kata Kunci:            cnc laser cutting; ss400; taguchi; grey relational analysis; manova
GRBL Based 3 Axis CNC Milling Design Azam Milah Muhamad; Radhi Maladzi; Luqyana, Dhiya; Damis, Candra; Nurjanah, Darul
Jurnal Mekanik Terapan Vol 6 No 3 (2025): Desember 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v6i3.7567

Abstract

This study presents the design and fabrication of a GRBL-based 3-Axis CNC Milling Machine for laboratory and small-scale industry applications. The system is controlled by an Arduino Uno using GRBL firmware, with NEMA 17 stepper motors and a DC 775 spindle. The Quality Function Deployment (QFD) method was applied to align the design with user requirements. The machine features a 600 × 400 mm working area, 200 Watt power consumption, and spindle speed ranging from 3,000 to 12,000 RPM. Testing results demonstrate high precision and energy efficiency. This machine is suitable for digital manufacturing education and prototyping.
Optimization of Bipolar Plate Machining Process Using the Taguchi Method on CNC 3-Axis Maladzi, Radhi; Mulyana, Fajar; Matsaany , Bayun; Yudisha, Nabila; Risfi, Muhammad Prasha; Rahman, Fio Izzafur; Ramadhan, Bilal; Alam, Zezero Meo Cahaya
Recent in Engineering Science and Technology Vol. 4 No. 01 (2026): RiESTech Volume 04 No. 01 Years 2026
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v4i01.140

Abstract

This study aims to optimize the machining parameters of bipolar plates using a CNC 3-axis milling machine based on the Taguchi method. Bipolar plates play a crucial role in proton exchange membrane fuel cells (PEMFCs), where dimensional accuracy and surface quality directly affect cell performance. The machining parameters considered in this research include spindle speed, feed rate, and depth of cut. An L9 orthogonal array was selected to design the experiments, and surface roughness as well as material removal rate (MRR) were evaluated as performance characteristics. Signal-to-noise (S/N) ratio analysis was applied to determine the optimal parameter combination. The results show that spindle speed and feed rate have the most significant influence on surface roughness, while depth of cut mainly affects the MRR. The optimal setting obtained was 3500 rpm spindle speed, 300 mm/min feed rate, and 0.2 mm depth of cut, which produced the lowest surface roughness and acceptable MRR. The confirmation experiment validated the Taguchi model prediction with an error of less than 5%. These findings demonstrate that the Taguchi method is an effective tool for optimizing CNC machining parameters of bipolar plates, improving both quality and manufacturing efficiency.
Comparative Study of Thermoelectric Generator Module Performance with Various Types of Plate Materials Wibi Pramanda; Rouf Muhammad; Yuliarto Joko Sumbogo; Hutomo Jiwo Satrio; Hamid Ramadhan Nur; Radhi Maladzi; muhamad Safi'i; Mochamad Nuruz Zaman
JURNAL ILMIAH MOMENTUM Vol 21 No 1 (2025): April
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v21i1.12692

Abstract

Advanced materials are used in thermoelectric generator (TEG) technology to turn heat into electricity using the Seebeck effect, which helps make better use of heat sources. The Seebeck effect is a result of the temperature disparity that exists between the two surfaces of the TEG. The configuration utilized in this investigation comprises several primary components, including the water block, thermoelectric, heat exchanger plate, and heater plate. The water block is positioned on the cold surface side of the thermoelectric to optimize the cooling process, while the heater plate is positioned on the surface side to facilitate the heating process. Initially, we position the heater plate to avoid direct contact between the heated surface side and the material plate. The plates consist of both copper and aluminum elements. This is done to facilitate the identification of the configuration systems, specifically TEG A (copper) and TEG B (aluminum). The research findings indicate that the TEG B configuration system, when subjected to a heating rate, yields superior voltage, current, and power outputs.
Co-Authors Achmad Widodo Adhi, Pribadi Mumpuni Alam, Zezero Meo Cahaya Azam Milah Muhamad Damis, Candra Darul Nurjanah Fajar Mulyana Hamid Ramadhan Nur Hutomo Jiwo Satrio Luqyana, Dhiya Matsaany , Bayun Matsaany, Bayun Mochamad Nuruz Zaman Moh Nurkhamal muhamad Safi'i Muklas, Muchamad Wali Nabila Yudisha Noor Hidayati Prakoso, Muhammad Azhar Putra, Rama Ardiansyah Rahman, Fio Izzafur Ramadhan, Bilal RATNA KHOIRUNNISA Risfi, Muhammad Prasha Rouf Muhammad Saidatuningtyas, Ifa Silitonga, Muhammad Prasha Risfi Toni Prahasto Vika Rizkia Vina Nanda Garjati Wibi Pramanda Yuliarto Joko Sumbogo