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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Jurnal Teknik Mesin Jurnal Sains dan Teknologi Jurnal Teknik Mesin Jurnal technoscientia Media Mesin: Majalah Teknik Mesin UNEJ e-Proceeding Majamecha JURNAL TEKNOLOGI TECHNOSCIENTIA Jurnal Teknik Mesin Jurnal Pengabdian Multidisiplin Indonesian Community Journal Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Ratna Kartikasari
Institut Teknologi Nasional Yogyakarta, Indonesia
Aerospace Engineering 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 Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Analisis Pengaruh Kadar Mn Terhadap Struktur Mikro dan Sifat Mekanik Coran Paduan Fe-Cr-Mn Kartikasari, Ratna; Muhfidin, Rivan; Anshory, Shodiq
Majamecha Vol. 6 No. 1 (2024): Majamecha
Publisher : Program Studi Teknik Mesin, Fakultas Teknik, Universitas Islam Majapahit, Mojokerto, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36815/majamecha.v6i1.3234

Abstract

Paduan Fe-Cr-Mn adalah salah satu jenis baja tahan karat seri austenitik yang dikandidatkan sebagai pengganti baja tahan karat konvensional (paduan Fe-Cr-Ni). Unsur mangan (Mn) berfungsi sebagai penstabil austenit, dapat meningkatkan kekerasan dan kekuatan. Secara ekonomis, unsur Mn relatif lebih murah sehingga dapat dijadikan sebagai alternatif pengganti Ni yang mahal. Penelitian ini bertujuan untuk menganalisis pengaruh kadar mangan (Mn) terhadap struktur mikro dan sifat mekanik coran baja paduan Fe-Cr-Mn dengan variasi kadar Mn 12%, 16%, dan 20%. Pengujian yang dilakukan dalam penelitian ini adalah uji komposisi kimia, uji struktur mikro, uji kekerasan dengan metode Vickers, uji tarik, dan uji impak dengan metode Charpy. Hasil uji komposisi kimia menunjukkan bahwa paduan Fe-Cr-Mn dalam penelitian ini berturut-turut mengandung Mn sebesar 12,72%, 18,05%, dan 20,69% kadar Cr sebesar 18,5% dan C 0,7%. Hasil uji struktur mikro menunjukkan bahwa coran baja paduan Fe-Cr-Mn memiliki struktur austenit dan ferit. Nilai kekerasan tertinggi terdapat pada spesimen dengan kadar Mn 20% yaitu sebesar 358,3 kg/mm2 VHN. Hasil uji kekuatan tarik menunjukkan tegangan tertinggi terdapat pada spesimen dengan kadar Mn 16% yaitu sebesar 34,72 MPa dan regangan sebesar 8%. Kemudian nilai regangan terkecil adalah 6% terdapat pada spesimen dengan kadar Mn 20%, dimana semakin tinggi kadar Mn nilai regangan semakin menurun. Harga impak tertinggi terdapat pada spesimen dengan kadar Mn 16% yaitu sebesar 0,169 J/mm2.
An experimental design of 3 kW variable speed wind turbine with doubly-fed induction generator for standalone applications Kadiman, Sugiarto; Kartikasari, Ratna; Yuliani, Oni
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 2: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i2.pp1160-1173

Abstract

Variable speed wind turbines are suitable for isolated populations, island communities or usages in which the charge of electric lines beats the connection and upkeep charge of wind turbine. This research builds wind turbine which working over variable velocity of wind. The proposed construct incorporates three-bladed aerofoil rotor, gear box with ratio 1:8, three-phase doubly-fed induction generator, automatic voltage regulator and tower. Results verify efficacy of this installed structure at wind speed of 7.0-8.2 m/s. The proposed design generates power output at 3 kW, voltage per phase between 220 V, and frequency of 50 Hz; and exhibits noise just around 60-70 dB which is below the permissible noise threshold of 85 dB.
Penerapan Standar Operasional Prosedur (SOP) dalam Produksi Eco Enzyme sebagai Upaya Penguatan Kapasitas Mitra Pengelola Sampah Muhfidin, Rivan; Sari, Sely Novita; Kartikasari, Ratna; Wijanarko, Yulius; Mahbubi, Khairul
I-Com: Indonesian Community Journal Vol 5 No 3 (2025): I-Com: Indonesian Community Journal (September 2025)
Publisher : Fakultas Sains Dan Teknologi, Universitas Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/i-com.v5i3.7732

Abstract

The Mukti Jaya Waste Management Group faced irregularities in eco enzyme production, resulting in low product quality and inefficiency. This community engagement aimed to enhance the group's technical and managerial capacity through the implementation of Standard Operating Procedures (SOPs). The methods included initial observation, participatory SOP development, hands-on technical training, and implementation mentoring. Results showed an increase in production volume from 12 to 20 liters per batch, a 40% improvement in time efficiency, and a rise in active member participation from 44.4% to 84.4%. Understanding of standardized procedures also improved from a score of 2.7 to 4.4. Evaluations using questionnaires and field observations confirmed enhanced technical and organizational capabilities. Additional impacts included the adoption of production and financial recording systems, the development of a collective work culture, and increased environmental awareness. SOPs proved to be not only a technical guide but also a community empowerment tool promoting efficiency, self-reliance, and sustainability in organic waste management.
Co-Authors -, Antony -, Antony Achmad Supiani Achmad Supiani Achmad Supiani Angelio Fila Delfianto Maitano Anita Susiana Anshory, Shodiq Daru Sugati Feri Frandika Jeremia Yakin Berkat Zandroto Joko Pitoyo Kadiman, Sugiarto M. Noer Ilman Mahbubi, Khairul Muhammad Oky Sadewa Mus ta kim Mustakim Mustakim Mustakim Oktavianus, Yosep Oni Yuliani R. Soekrisno Sely Novita Sari Solikhah Retno Hidayati Subardi Subardi Subardi Sutrisna Sutrisna Suyitno Suyitno Teddy Marvin Silalahi Wartono Wartono Wijanarko, Yulius