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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) TEKNIK Rekayasa Mesin Sinergi R.E.M (Rekyasa Energi Manufaktur) Jurnal Turbo : Jurnal Program Studi Teknik Mesin Conference on Innovation and Application of Science and Technology (CIASTECH) JOURNAL OF SCIENCE AND APPLIED ENGINEERING JAST : Jurnal Aplikasi Sains dan Teknologi Jurnal Masyarakat Merdeka (JMM) Jurnal Teknik Mesin Indonesia Jurnal Aplikasi Dan Inovasi Ipteks SOLIDITAS Jurnal Energi dan Teknologi Manufaktur Scientific Journal of Mechanical Engineering Kinematika JURNAL FLYWHEEL Jurnal Mesin Nusantara Journal mechanical and manufacture technology (JMMT) ARMATUR : Artikel Teknik Mesin dan Manufaktur Aceh International Journal of Science and Technology Prosidia Widya Saintek Jurnal Polimesin PROTON : Jurnal Ilmu-Ilmu Teknik Mesin J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin
Purbo Suwandono
Program Studi S1 Teknik Mesin, Fakultas Teknik, Universitas Widyagama Malang
Aerospace Engineering Agriculture, Biological Sciences & Forestry 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 Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Journal : Jurnal Polimesin

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Effect of magnetite nanoparticles on the viscoelastic properties of magnetorheological elastomers Priyandoko, Gigih; Suwandono, Purbo
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7109

Abstract

Advanced materials known as Magnetorheological Elastomers (MREs) can be used to dampen vibrations. These materials reduce vibration disturbances by responding to an externally applied magnetic field, which alternate their mechanical characteristics. The objective of this research is to explore the effect of incorporating magnetic nanomaterials (Fe₃O₄) on the properties of MRE. The modified material is expected to exhibit enhanced sensitivity to magnetic fields, thereby improving its vibration-damping performance. The MRE mixture utilized in this investigation consists of Carbonyl Iron Powder (CIP), silicone oil, and silicone rubber, with mass percentages of 30%, 5%, and 65%, respectively. The MRE was then given magnetite nanomaterials in amounts of 0.5%, 1%, 1.5%, and 2% of the total weight. To produce MRE, thoroughly mix the silicone rubber with silicone oil and then gradually add the carbonyl iron powder, ensuring uniform dispersion. Once the homogeneity was achieved, the magnetite nanomaterial were incorporated into the MRE mixture with precision. The resulting composite were then cured, optionally under a magnetic field to induce anisotropic alignment. Laboratory tests were conducted on the new material. These tests involved analyzing their elemental composition and evaluating their viscoelastic properties. The research findings indicate the successful development of MREs containing Fe₃O₄ nanomaterials for the purpose of vibration dampening within the frequency range of 1–100 Hz. At a center frequency of 1,167 Hz, MRE-2 (MRE with a 0.5% addition of Fe₃O₄) demonstrated the strongest damping performance, exhibiting the highest tan δ value. This makes MRE-2 the primary choice. MRE-1 is an excellent alternative due to its high stiffness and effective damping at low frequencies.
The effect of biomass ratio and CaO/Si catalyst on hydrogen production from corncob–wood pellet gasification Suwandono, Purbo; Wijayanti, Widya; Ismail, Nova Risdiyanto; Akbar, Dzulfikar Johan; Pambudi, Wisnu Setyo Catur
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7803

Abstract

Biomass co-gasification combined with catalytic upgrading offers a promising pathway for enhancing hydrogen-rich syngas production. This study investigates co-gasification of corncob and wood pellets in an updraft fixed-bed reactor, integrated with ex-situ CaO/Si catalytic upgrading. Nine experimental runs were conducted by varying the corncob: pellet ratio (1:1–3:1), catalyst loading (6–10 wt% of 80 g biomass), and CaO/Si ratio (1:1–3:1), while reactor geometry, inlet air speed (10 m/s), and run duration (1500 s) were kept constant. The product gas was routed through an ex-situ catalyst bed, cooled in a condenser, and then analyzed using calibrated MQ sensors (H₂, CH₄, CO, CO₂). Gas composition was monitored using calibrated MQ sensors to provide comparative trends among operating conditions. The best performance was observed in Run 7 (50:50 biomass ratio, 10 wt% catalyst, CaO/Si = 2:1), achieving peak H₂ at 8000 ppm and CH₄ at 46,000 ppm, while CO₂ decreased to 16,000 ppm compared with several other runs. This outcome was consistent with CO₂ sorption by CaO, which can shift reactions toward higher H₂ formation (e.g., via the WGS equilibrium), and was supported by downstream upgrading reactions in the hot-gas line. The results suggest that combining biomass blending with ex-situ CaO/Si upgrading can improve the characteristics of hydrogen-enriched syngas within the investigated operating range.Biomass co-gasification combined with catalytic upgrading offers a promising pathway for enhancing hydrogen-rich syngas production. This study investigates co-gasification of corncob and wood pellets in an updraft fixed-bed reactor, integrated with ex-situ CaO/Si catalytic upgrading. Nine experimental runs were conducted by varying the corncob: pellet ratio (1:1–3:1), catalyst loading (6–10 wt% of 80 g biomass), and CaO/Si ratio (1:1–3:1), while reactor geometry, inlet air speed (10 m/s), and run duration (1500 s) were kept constant. The product gas was routed through an ex-situ catalyst bed, cooled in a condenser, and then analyzed using calibrated MQ sensors (H₂, CH₄, CO, CO₂). Gas composition was monitored using calibrated MQ sensors to provide comparative trends among operating conditions. The best performance was observed in Run 7 (50:50 biomass ratio, 10 wt% catalyst, CaO/Si = 2:1), achieving peak H₂ at 8000 ppm and CH₄ at 46,000 ppm, while CO₂ decreased to 16,000 ppm compared with several other runs. This outcome was consistent with CO₂ sorption by CaO, which can shift reactions toward higher H₂ formation (e.g., via the WGS equilibrium), and was supported by downstream upgrading reactions in the hot-gas line. The results suggest that combining biomass blending with ex-situ CaO/Si upgrading can improve the characteristics of hydrogen-enriched syngas within the investigated operating range.
Co-Authors AA Sudharmawan, AA Adin Nurrohman Aditya Wahyu Winadi Atmajaya Agung Suprapto, Agung Agus Nofiyanto Ahmad Rusli Wahyu Setiawan Akbar, Dzulfikar Johan Akhmad Farid Akhmad Farid Akhmad Farid Al Barr, Muhammad Haafizh Alvin Dio Nugroho Andy Hardianto Andy Hardianto Anggunio, Cornelius Arie Restu Wardhani Arief Rizki Fadhillah Dadang Hermawan Dadang Hermawan Dicky Dikananda Nafis Dicky Dikananda Nafis Diky Siswanto Dlofir, Aan Taufik Dwi Anggraeni, Frida Fachrudin Fachrudin Fachrudin Hunaini Fanani, Akhmad Rizal Ferdinando, Rio Fressy Nugroho Frida Dwi Anggraeni Frida Dwi Anggraeni Gatot Soebiyakto Gatot Soebiyakto Gatot Soebiyakto Gatot Subiyakto Gatot Subiyakto Gatot Subiyakto Gatot Subiyakto Gatot Subiyakto Hakim, Muhammad Izzuddin Abdul Hangga Wicaksono Heni Pujiastuti Hunaini, Fachrudin Hutri Wicaksono, Leo Imaduddin, Fitrian Imam Hambali Ismail*, Nova Risdiyanto Ismail, Nova Ridiyanto Leo Hutri Wicaksono Lukman Hakim M. Agus Sahbana M. Ghazali Arrahim Mardianto, Dias Moch. Zainul Achyak Mochammad Nurcholis Majid Muhammad Agus Sahbana Muhammad Arief Hidayat Muhammad Ilman Nur Sasongko Muhammad Reza Nafisah, Viona Ngudi Tjahjono Nova R. Ismail Nova Risdiyanto Ismail Novayako, Riza Dandy Nurida Finahari Nurkholis Hamidi Pambudi, Wisnu Setyo Catur Prakoso, Yogi Iman Prasetyo, Rino Ayogi Adi Prihandarini, Ririen Priyandoko Gigih Putra, Gusty Nanda Kharisma R. Ismail, Nova Rama Agus Santoso Ramadhani, Auzhar Rafli Ririen Prihandarini Rizki Hidayat Sigit Tri Wicaksono Silviana Silviana Silviana Silviana Sitanggang, Rickie Natanael Solichi, Azis Sumartono Ali Putra Sunjana, Dhanie Freida Aji Suriansyah, Suriansyah Ubaidillah Ubaidillah Ubaidillah Ubaidillah Wahai, Rizky Wahyudi, M. Ilham Setyo Wicaksono, Hangga Wicaksono, Leo Hutri Widya Wijayanti Wijaya, Rendra Adi