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All Journal Prosiding Semnastek Journal on Education Jurnal Ilmiah Teknik Mesin Poros
Rini Prasetyani
Jurusan Teknik Mesin, Universitas Pancasila
Computer Science & IT Education Mechanical Engineering

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PERAN PENGUAT PARTIKEL ALUMINA DAN SILIKON KARBIDA TERHADAP KEKERASAN MATERIAL KOMPOSIT MATRIKS ALUMINIUM Hendri Sukma; Rini Prasetyani; Dwi Rahmalina; Rizal Imanuddin
Prosiding Semnastek PROSIDING SEMNASTEK 2015
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Komposit matriks aluminium berpenguat partikulat banyak dikembangkan untuk aplikasi komponen otomotif dan kendaraan taktis militer, karena mempunyai berat jenis yang lebih ringan dibanding logam ferrous serta memiliki performa yang baik seperti kekuatan tinggi, kekerasan tinggi, sifat tahan aus dan koefisien ekspansi panas rendah. Penelitian ini bertujuan untuk menghasilkan material komposit matriks aluminium berpenguat alumina (Al2O3) dan silicon karbida (SiC) yang memiliki sifat mekanis yang paling baik. Komposit dibuat dari matriks Al-3Si-9Zn-6Mg berpenguat partikel alumina (Al2O3) dan silikon karbida (SiC), dengan variasi fraksi volume alumina 10% tanpa tambahan SiC, serta dengan penambahan SiC 5% dan 10%. Proses pengecoran dilakukan dengan metode squeeze casting. Hasil pengujian menunjukkan bahwa komposit dengan penguat alumina tanpa silicon karbida memiliki kekerasan yang paling tinggi yaitu rata-rata sebesar 60,28 HRB, dengan harga impak 0.0383 J/mm2. Dengan penambahan silicon karbida 5 % didapat nilai kekerasan yang lebih rendah yaitu 43 HRB dengan harga impak tetap 0.0383 J/mm2, serta untuk penambahan silicon karbida 10% didapat nilai kekerasan 41,8 HRB dengan harga impak 0.0638 J/mm2. Tidak terjadinya peningkatan kekerasan material komposit alumina dengan penambahan penguat silicon karbida ini disebabkan karena ketidaksempurnaan dalam proses peleburan dan pengecoran, dimana partikel silikon karbida sangat sulit bercampur secara merata dengan aluminium dan alumina. serta timbulnya cacat porositas (void) akibat dari masih terdapatnya udara yang terperangkap di dalam material coran yang tidak sepenuhnya terbuang pada saat proses degassing. Dari analisa struktur mikro terlihat partikel SiC tidak tersebar secara merata dan cenderung untuk mengumpal di satu tempat.
PERANCANGAN WHEEL TURBINE PADA PEMBANGKIT LISTRIK MIKRO GAS TURBIN Eko Prasetyo Prasetyo; Rudi Hermawan Hermawan; Muhammad Edza Fakhri; Rini Prasetyani Prasetyani; Erlanda Augupta Pane
Jurnal Ilmiah Teknik Mesin POROS Vol 16, No 2 (2018): Jurnal Ilmiah Teknik Mesin Poros
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.207 KB) | DOI: 10.24912/poros.v16i2.11656

Abstract

Micro gas turbine power generator has advantages in low maintenance and operational costand can be moved easily. Gas fueled micro gas turbine generate power by delivering pressurizedcombustion gas to mechanical power and stored in battery via altenator. In this research, turbine whellfrom Garrett TA31 in micro gas turbine is redesigned to increase the system performance. Experiment ofredesigned turbine wheel is then compared with the previous configuration turbine wheel performance.The results show the system power is increased from 0,23 kW to 3,1 kW.
Analisis Kinerja Keuangan LSP ABC Jakarta dalam Penentuan Strategi Bisnis dengan Pendekatan Analisis SWOT Renny Reswati; Haris Adi Swanoro; Rini Prasetyani; Dadan Hadiat Ramdany
Journal on Education Vol 5 No 3 (2023): Journal on Education: Volume 5 Nomor 3 Tahun 2023 In Press
Publisher : Departement of Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joe.v5i3.1524

Abstract

LSP ABC is an oil and gas certification service company located in the Duren Tiga, Pancoran, South Jakarta. At the beginning of 2020, economic, social and cultural activities began to be disrupted by the Covid-19 pandemic. This has an impact on the company, so that the certification application data in 2020 tends to decrease compared to the previous year, 2019. Therefore, it is necessary to analyze the company's financial ratios to find out the impact of this pandemic on the company's financial performance. This study aims to determine the company's financial condition using the ratio analysis method and managing business strategies using the SWOT analysis method to determine alternative strategies in determining decisions for the company so that company goals can be achieved. Data collection is done by interview the LSP ABC which is then processed and analyzed, the results obtained in the form of an average liquidity value of 2.874% which was above the company standard of 150%, the average solvency value of 92.6% according to the standard which is under 200%, and a profit of 24%. Based on these results, it can be concluded that the company's profits in 2020 decreased when compared to 2019 but the financial condition was in a good condition. Meanwhile, for business strategy analysis using SWOT, LSP ABC is in quadrant II position so it must diversify its business.
Co-Authors Dadan Hadiat Ramdany Dwi Rahmalina, Dwi Eko Prasetyo Erlanda Augupta Pane Haris Adi Swanoro Hendri Sukma Muhammad Edza Fakhri Renny Reswati Rizal Imanuddin Rudi Hermawan Hermawan