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Politeknik Negeri Semarang, Indonesia
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INDONESIA
Jurnal Rekayasa Mesin
Published by Politeknik Negeri Semarang
ISSN : 14116863     EISSN : 25407678     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin(d/h MANDEGANI) diterbitkan sejak 1997, dengan frekuensi 3 kali setahun. Misi : media komunikasi bagi dosen, praktisi, dan ilmuwan tentang karya ilmiah (scientific article) hasil-hasil penelitian, survei, studi kasus dan telaah pustaka yang erat hubungannya dengan teknik mesin, meliputi topik/tema seperti perancangan mesin, instalasi, perawatan & perbaikan mesin, bahan konstruksi & komponen mesin, teknik pengerjaan logam, pembuatan komponen mesi n, pengujian bahan dan komponen mesin, teknik pengukuran & kontrol kualitas proses/produk industri manufaktur, manajemen & teknik produksi industri manufaktur, pembentukan dan pengembangan desain produk, aplikasi komputer dalam sistem kendali & operasi mesin, mesin-mesin kalor & fluida, sistem pembangkitan energi, mesin pendingin & pengkondisian udara, pembangkitan energi alternatif & terbarukan.
Arjuna Subject : -
Articles 514 Documents
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Effect of Palm Flour Addition on Carbon Fiber/Epoxy Twill Composites Fabricated by Vacuum Bagging Muhammad Damar Pambudi; Viktor Naubnome; Iman Dirja; Indra Aditya; M Hafid; Agus Bayu Utama; Boy Bistolen
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, August 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i2.7703

Abstract

Carbon fiber/epoxy composites are widely used in structural applications due to their high strength, good stiffness, and low weight. Along with the increasing demand for more economical and sustainable materials, arenga palm (Arenga pinnata) flour has the potential to be utilized as a natural filler in composite materials. However, the effect of arenga palm flour addition on the tensile properties of 2x2 twill carbon fiber composites produced using the vacuum bagging method has not been widely reported. This study aims to analyze the effect of arenga palm flour content on the tensile strength of carbon fiber/epoxy composites. The filler contents used were 0%, 5%, 10%, and 15% by resin mass, while tensile testing was carried out according to ASTM D3039 to determine the ultimate tensile strength (UTS) and young’s modulus. The results showed that the average UTS values for the 0%, 5%, 10%, and 15% variations were 499.95 MPa, 484.29 MPa, 488.42 MPa, and 538.33 MPa, respectively. The highest young’s modulus was obtained in the 0% variation at 25.11 GPa, whereas all specimens containing arenga palm flour showed values in the range of 21–22 GPa. These findings indicate that the addition of arenga palm flour tends to reduce composite stiffness. However, at certain compositions, it has the potential to improve the maximum tensile strength.
Capacitive Sensing of Biodiesel Water Content: Effect of Input Amplitude Combinations on Phase Shift-Capacitance Correlation Hari Sumartono; Mahfudz Al Huda; Berkah Fajar Tamtomo Kiono; Achmad Widodo; Nacep Suryana; Ratno Nuryadi
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, August 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i2.7705

Abstract

The increasing biodiesel blending ratio in diesel fuel in Indonesia has drawn attention from vehicle manufacturer, who demand higher biodiesel quality. Water content is one of the critical quality parameters of biodiesel. Coulometric Karl Fischer titration is a commonly used for water content measurement method, however it is costly. This study investigates the feasibility of using a capacitive sensor based on phase shift angle detection to measure water content in biodiesel. Variations in biodiesel water content will change the capacitance of the sensor, which will be converted by an electronic circuit into an electronic signal output. The phase of the output signal is the one to be observed. Experiments were conducted over two different capacitance ranges (ΔC), namely 7.1-7.6 pF and 25.1-25.6 pF, a series of capacitors were used as a dummy sensor. A clear trend of phase shift angles and capacitance values correlation was observed. The strongest correlation was obtained in the ΔC range of 7.1-7.6 pF, whith input signal amplitude 10.27 V (S1) and 6.24 V (S2). The linear trendline slope was 27.62, sensitivity 27.07 degree/pF, and with a coefficient of determination (R2 ≈ 0.98). The selected capacitance measurement range has significant influence on the measurement performance and, consequently, should be considered in determining the dimensions of the capacitive sensor. This result demonstrate that the proposed phase shift based capacitive sensing method is a promising and cost-effective approach for biodiesel water content measurement.
Front Matter Jurnal Rekayasa Mesin Vol. 21 No. 2 August 2026 Jurnal Rekayasa Mesin
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, August 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i2.8126

Abstract

Back Matter Jurnal Rekayasa Mesin Vol. 21 No. 2 August 2026 Jurnal Rekayasa Mesin
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, August 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i2.8128

Abstract

Page 52 of 52 | Total Record : 514

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