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Padang Yanuar
Jurusan Magister Teknik Mesin Fakultas Teknik UNDIP Jl. Prof. Sudharto SH Kampus Undip Tembalang Semarang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation

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Two-Degree-of-Freedom Flow-Induced Vibrations of an Elastically-Mounted Cylinder under Oscillatory Flow: A Numerical Study Riadini, Elfrida Rizky; An-Nizhami, Avicenna; Yanuar, Padang; Yobioktabera, Amran; Lathief, Muttabik Fathul
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7102

Abstract

Flow-Induced Vibration (FIV) in oscillatory flow represents a complex fluid–structure interaction that remains insufficiently explored, particularly for two-degree-of-freedom (2-DoF) systems allowing coupled inline and cross-flow motion. Previous studies have primarily focused on steady flows or limited parameter ranges, leaving a significant knowledge gap in understanding dynamic responses influenced by both reduced velocity ( ) and Keulegan–Carpenter (KC) numbers. This study aims to numerically investigate the vibration characteristics of a 2-DoF circular cylinder subjected to oscillatory flow, emphasizing the coupling mechanism between the two motion directions under varying  and KC values. The research employed a numerical approach based on the Direct Forcing Immersed Boundary (DFIB) method integrated with Navier–Stokes solvers and structural motion equations. Simulations were conducted for KC values of 5–20 and  ranges between 5–35. The temporal integration was performed using the third-order Adams–Bashforth schemes to ensure accuracy and stability. The results reveal that lock-in phenomena occur within specific UR ranges for each KC value, with resonance peaks identified at  = 5 for KC = 5,  = 10 for KC = 10,  = 15 for KC = 15, and  = 20 for KC = 20. Increasing KC values amplify the interaction between flow and structural responses, producing multi-mode vibrations and nonlinear coupling between inline and transverse motions. Furthermore, galloping phenomena were detected at higher UR, indicating a transition from vortex-induced vibration to hydrodynamic instability. These findings contribute to a deeper understanding of FIV dynamics in oscillatory environments, offering insights for optimizing offshore structure design and wave energy harvesting devices.
Optimizing curing parameters to enhanced the compressive strength and toughness properties of Resin-Coated Sand (RCS) in foundry applications Khoryanton, Ampala; Harmanto, Sri; Mamba’udin, Ahmad; Alfauzi, Abdul Syukur; Tristijanto, Hery; Abidin, Zaenal; Yanuar, Padang; Putri, Farika Tono; Nugroho, Wahyu Isti; Kristiawan, Timotius Anggit; Sugiono, Friska Ayu Fitriani; Mujiarto, Iman; Riadini, Elfrida Rizky; Wirawan, Yuris Bahadur
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6124

Abstract

Conventional heating methods remain prevalent among small and medium-sized enterprises (SMEs) for aluminum mold thermal regulation during resin-coated sand (RCS) core production. Inconsistent thermal regulation significantly alters the characteristics of resin-coated sand cores. This study aims to investigate the effect of curing parameters on the compressive strength and toughness of the resin-coated sand. The RCS specimens were prepared using an aluminum mold that underwent controlled thermal treatment in an electrical furnace. The thermal treatment is performed by processing specimens across a curing temperature range of 200-300°C and varying curing time from 3 to 15 minutes. HDPE polymer was proposed as the RCS binder. Compressive and impact tests were carried out to determine the characteristics of resin-coated sand. The results showed a non-linear relationship between curing parameters and mechanical properties. Although moderate curing time and higher temperatures initially improve compressive strength and toughness, exceeding optimal thresholds leads to the degradation of these mechanical characteristics. The highest mechanical properties (compressive strength = 38.4 MPa, toughness = 0.43 MPa) are achieved through a curing temperature of 250°C and a curing time of 9 minutes. This study provides valuable insights into determining the optimal parameters for processing resin-coated sand cores or molds with superior compressive and toughness properties.
PENERAPAN DAUR ULANG (RECYCLE) PASIR SILIKA DALAM PROSES PEMBUATAN CETAKAN PASIR UNTUK MENEKAN BIAYA PRODUKSI DI CV. RAM TEGAL Yanuar, Padang; Khoryanton, Ampala; wirawan, yuris; Tristijanto, Hery; Anggit Kristiawan, Timotius; Tono Putri, Farika; Syukur Alfauzi, Abdul; Harmanto, Sri; Isti Nugroho, Wahyu; Abidin, Zaenal; Fitrianti Sugiono, Friska Ayu; Rizky Riadini, Elfrida; Mujiarto, Iman; Mamba'udin, Ahmad; Satya, Evan Bagas; Prasetyo, Anoeng; Mahendra, Tegar Aprilio
ABDIMAS UNWAHAS Vol. 11 No. 1 (2026): Abdimas Unwahas
Publisher : Universitas Wahid Hasyim Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/abd.v11i1.15346

Abstract

Objek yang menjadi mitra kegiatan pengabdian adalah CV. Rejeki Abadi Machinery (CV RAM) yang bergerak di bidang pengecoran logam. Dalam proses produksinya, perusahaan menggunakan pasir silika sebagai bahan utama dalam pembuatan cetakan untuk komponen pompa. Permasalahan yang dihadapi mitra adalah belum dimanfaatkannya limbah dari proses pengecoran di CV.RAM khususnya pasir silica, sehingga biaya produksi menjadi tinggi. Solusi yang diberikan adalah pasir silica setelah digunakan direcycle sehingga dapat menekan biaya produksi. Metode yang akan dipakai untuk pelaksanaan rencana tersebut yaitu: tahapan perencanaan, pelaksanaan program dan pendampingan sampai evaluasi kegiatan mitra. Hasil pengabdian yang dilakukan dengan teknologi tepat guna berupa mesin pengayak pasir yaitu kebutuhan pasir silika baru mencapai 25 ton per bulan, berkurang menjadi 16 ton per bulan setelah alat diterapkan. Hal ini menunjukkan efisiensi penggunaan pasir silika daur ulang sebesar 9 ton per bulan. Meskipun harga pasir silika tetap Rp. 800.000,- per ton, total biaya pembelian menurun dari Rp. 20.000.000,- menjadi Rp. 12.800.000,- per bulan, sehingga penghematan biaya perbulan dapat dicapai sebesar Rp. 7.200.000,- atau 36% dari total biaya sebelumnya.
APLIKASI OVEN GAS MANUAL, STEAMER KRAKAT & PEMASARAN ONLINE UNTUK MENINGKATAN KAPASITAS PRODUKSI &VOLUME PEMASARAN SNACK DAN KUE PADA UKM DI KOTA SEMARANG : oven gas manual dan steamer krakat iman, Mujiarto; yanuar, padang; setyawan, Trio; Suyanto, Suyanto; Prihatmini, Eri
ABDIMAS UNWAHAS Vol. 11 No. 1 (2026): Abdimas Unwahas
Publisher : Universitas Wahid Hasyim Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/abd.v11i1.14834

Abstract

Industri rumah tangga memiliki peran penting dalam meningkatkan kesejahteraan keluarga dan masyarakat, khususnya sektor kuliner seperti produksi snack dan kue. Namun keterbatasan peralatan produksi dan pemasaran secara digital masih menjadi kendala dalam pengembangan usaha skala rumah tangga. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan kapasitas produksi dan memperluas jangkauan pemasaran produk industri rumah tangga melalui penerapan teknologi peralatan produksi dan pemasaran online. Metode kegiatan yang dilaksanakan meliputi diseminasi teknologi tepat guna berupa steamer (pengukus sederhana) dan oven gas manual, serta pelatihan pemasaran digital. Program ini melibatkan tiga mitra calon pengusaha kuliner melalui kegiatan pelatihan, pendampingan penggunaan alat, dan praktik pemasaran produk secara online. Hasilkegiatan menunjukkan peningkatan kemampuan mitra dalam proses produksi, peningkatan kapasitas dan variasi produk, serta mulai berkembangnya pemasaran produk melalui media digital. Terjadi juga peningkatan kesiapan mitra dalam mengelola usaha secara mandiri.
Co-Authors Abdul Hamid Aditya, Dwiky Septian Agus Pramono Ahmad Mamba'udin Alfauzi, Abdul Syukur Alisyafa’at, Ahmad Dhimas Aminuyati Amran Yobioktabera An Nizhami, Avicenna Andreyanto W, Mirda Anggit Kristiawan, Timotius Anggit, Timotius Antoro, Daffa Yudha Akbar Putra Apriandi, Nanang Apriandi Ardjo, Anwar Sukito Aulia, Nur Fatowil Ayu S, Friska Budhi Prasetiyo Dwiana Hendrawati Elfrida Rizky Riadini Farhan, Muchamad Fitrianti Sugiono, Friska Ayu Ghozali, Hanif Faizal Hartono Hartono Hery Tristijanto Huda, Muhamad Nurul iman, Mujiarto Isti Nugroho, Wahyu Iyadul, Fatih Janitra, Atikah Ayu Khoryanton, Ampala Lathief, Muttabik Fathul Lilin Hermawati Mahendra, Tegar Aprilio Mamba'udin, Ahmad Marliyati Marliyati, Marliyati Mulyono Mulyono Nailul Ulum, Muhammad Showi Nanang Apriandi Nanang Budi Sriyanto Nizami, Avicenna An Oktariza, Gio Prasetyo, Anoeng Prihatmini, Eri Purnomo, Adhy Putri, Farika Tono Rani Raharjanti Rizky Riadini, Elfrida Safriana, Eni Saputro, Raynaldi Satito, Aryo Satya, Evan Bagas Setiawan, Trio Setiyawan, Trio Setyawan, Martando Robby Setyawan, Trio Slamet Priyoatmojo, Slamet Sri Harmanto Sriharmanto, Sriharmanto Sugiono, Friska Ayu Fitriani Sunarto Sunarto Supandi Suwarti Suwarti Suyanto Suyanto Syukur Alfauzi, Abdul Tengku Riza Zarzani N Timotius Anggit Kristiawan Tono Putri, Farika Tristidjanto, Hery Wahyono Wahyono Wahyu Isti Nugroho Widodo, Ignatius Gunawan wirawan, yuris Wiwik Purwati Widyaningsih yatimah, Dhurotul Yoeli Janto, Yoeli Yuris Bahadur Wirawan, Yuris Bahadur Yusuf Dewantoro Herlambang Zaenal Abidin