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Avicenna An-Nizhami
Politeknik Negeri Semarang
Mechanical Engineering

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Aplikasi Cooling Dehumidification pada Mesin Pengering untuk Mengeringkan Hasil Panen Tanaman Herbal Sudirman Sudirman; I Nyoman Gede Baliarta; I Made Sudana; Made Ery Arsana; Avicenna An- Nizhami; Nanang Apriandi
Jurnal Rekayasa Mesin Vol 18, No 1 (2023): Volume 18, Nomor 1, April 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i1.4094

Abstract

Pengeringan merupakan alternatif yang cocok untuk pengelolaan pasca panen, terutama di negara seperti Indonesia yang fasilitas distribusi dan penanganan pasca panennya kurang baik. Produk pertanian berupa tanaman herbal memerlukan penanganan pasca panen khusus, agar produk dapat disimpan dalam waktu yang lama tanpa mengurangi aroma. Salah satu produk pertanian tanaman herbal adalah jahe. Dalam proses pengolahan pasca panen, untuk mendapatkan jahe kering, dibutuhkan teknik pengeringan dengan temperatur yang rendah agar tekstur dari produk akhir yang dihasilkan tidak banyak berubah. Tujuan dari penelitian ini adalah mengaplikasikan sistem dehumidifikasi pada mesin pengering jahe untuk mendapatkan temperatur pengeringan jahe yang sesuai namun efisien. Metode yang digunakan di dalam penelitian ini adalah metode eksperimental, dimana temperatur pengeringan dikontrol pada suhu 40°C dengan waktu pengeringan selama 7 jam. Hasilnya, jahe segar yang dikeringkan dengan pengering sistem dehumidifikasi menghasilkan penurunan berat rata-rata 80,66% dengan kandungan kadar air rata-rata sebesar 9,2%.
Experimental and Numerical Study of Shock Absorber Characterization and The Implication on The Dynamics of Half Vehicle Suspension System Model Avicenna An-Nizhami; Nanang Budi Sriyanto; Bambang Sumiyarso; Showi Nailul Ulum; Elfrida Rizky Riadini; Ignatius Gunawan Widodo
Jurnal Rekayasa Mesin Vol 18, No 3 (2023): Volume 18, Nomor 3, Desember 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i3.5023

Abstract

This study aimed to characterized shock absorber damping for passenger comfort. The riding comfort of the vehicle has direct correlation to the damping characteristic of the shock absorber of the suspension system. Two different shock absorbers were experimentally evaluated, and their damping characteristics were integrated into a half-car model to study the vehicle's dynamic response to harmonic road disturbances. The investigation involved numerical simulations of the half-car model subjected to harmonic road disturbances, represented by a set of ordinary differential equations solved using the Dormand-Prince method. Experimental data yielded average damping forces of 502.77 N for shock-absorber #1 and 192.03 N for shock-absorber #2. Calculations resulted in damping coefficients of 3888.57 N·s/m for shock-absorber #1 and 1397.85 N·s/m for shock-absorber #2, with corresponding damping ratios of 0.29 and 0.105. These damping ratios generally aligned with typical values for passenger car shock absorbers, except for shock-absorber #2, which deviated from the expected range. The study found that at 60 km/h and 90 km/h, shock-absorber #1 with ζ=0.29 exhibited superior performance in reducing displacement amplitude compared to shock-absorber #2 at ζ=0.105. However, at 120 km/h, both shock-absorbers displayed similar responses, with shock-absorber #1 slightly surpassing shock-absorber #2 in displacement amplitude.
Co-Authors Bambang Sumiyarso Elfrida Rizky Riadini I Made Sudana I Nyoman Gede Baliarta Ignatius Gunawan Widodo Made Ery Arsana Nanang Apriandi Nanang Budi Sriyanto Showi Nailul Ulum Sudirman