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Zahrul Fuadi
Syiah Kuala University
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Low-frequency Stick-slip of A Creep Groan on A Simple Caliper-slider Experimental Model Zahrul Fuadi
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17.41 KB)

Abstract

This paper discussed a preliminary study of low-frequency stick-slip of a creep groan using a simple caliper-slider model. The experiment model is constructed based on the real operating system behind a vehicle braking system. The model consists of a sliding bar, a caliper and an arm. The analysis shows that the main frequency of generated low-frequency stick slip of the creep groan is 100 Hz with sound pressure level of 70 dB. It is found that the low-frequency stick-slip motion the result of the vibration in tangential direction. The frequency of the generated stick-slip is close to the bending natural frequency of the system. Several parameters that are important in the generation of the low-frequency of stick –slip are the sliding velocity and the contact roughness. Therefore, further study of creep groan should take into account these important parameters as well as other operating parameters.
Complex Eigenvalue Analysis of A Motorcycle Disc Brake Squeal Zahrul Fuadi; Muhammad Nizar Machmud
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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This paper discusses the phenomenon of brake squeal of a disc brake system used at motorcycle with a capacity of 125 cc. The occurrence of disc brake squeal is associated with the dynamic instability of the system with the influence coefficient of friction. The dynamic instability of the system is predicted using finite element complex eigenvalue analysis. The analysis predicted three unstable modes in the frequency range below 5 kHz. The unstable modes occurred at the frequency of 1250 Hz, 1920 Hz, and 2306 Hz. The occurrence of unstable mode is indicated by the presence of positive real part of the corresponding complex eigenvalue. Unstable mode is shown by the occurrence of coupled vibration between eigenvectors of disc and brake pads vibrating at similar frequency which consists of diametral mode of disc and bending modes of pads. The analysis also showed that the unstable condition could occur at a value of coefficient of friction as low as 0.2.
Sistim pengeringan ikan dengan metode hybrid Muhammad Hatta; Ahmad Syuhada; Zahrul Fuadi
Jurnal POLIMESIN Vol 17, No 1 (2019): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v17i1.666

Abstract

Sistem Pengeringan dengan metode hybrid merupakan sistem pengeringan yang menggunakan dua atau lebih sumber energi untuk proses penguapan air. Pengering hybrid pada penelitian ini menggunakan sumber energi matahari dengan bantuan solar kolektor dan energi bahan bakar gas. Penelitian ini merupakan alternatif teknologi untuk kasus pengeringan ikan. Tujuan dari penelitian ini adalah untuk meningkatkan temperatur udara panas ruang pengering hybrid, melakukan optimalisasi waktu pengeringan dan menghitung kadar air pada ikan. Penelitian ini dilakukan di halaman Fakultas Teknik Universitas Syiah Kuala. Hasil pengukuran temperatur tertinggi ruang pengering tanpa bahan/ikan dengan menggunakan kolektor surya adalah 43 oC dengan intensitas cahaya matahari tertinggi 915 W/m2, setelah menggunakan metode hybrid temperatur tertinggi ruang pengering dengan kondisi ada bahan/ikan meningkat sampai 67 oC dengan intensitas cahaya matahari tertinggi 908 W/m2. Pengeringan menggunakan energi hybrid relatif lebih singkat yaitu 8,5-13 jam sedangkan pengeringan secara tradisional membutuhkan waktu selama 3 hari dengan kondisi cuaca cerah dan intensitas cahaya matahari yang tinggi. Tingkat penguapan kadar air mencapai 30,25% - 38,18 % untuk ikan karang/ikan kakap merah, dan 53,30% - 57,13% untuk ikan teri. Kata kunci: Pengering Hybrid, Kadar Air, Temperatur, Kolektor Surya dan Energi Bahan Bakar Gas. AbstractDrying System with hybrid method is a drying system that uses two or more sources of energy for the evaporation process of water. Hybrid dryers in this study use solar energy sources with the help of solar collectors and gas fuel energy. This research is an alternative technology for cases of drying fish. The purpose of this study is to increase the heat temperature of the hybrid drying chamber, to optimize the drying time and calculate the moisture content of the fish. This research was conducted in the laboratory of the Faculty of Engineering of Syiah Kuala University. The highest temperature measurement of the drying room without materials/fish using solar collector was 43 oC with the highest solar light intensity of 915 W/m2, after using hybrid method the highest temperature of drying chamber with the condition there was fish/ingredients increased up to   67 oC with the highest sun light intensity is 908 W/m2. Drying uses hybrid energy was relatively shorter 8.5-13 hours while drying traditionally takes 3 days with sunny weather conditions and high sunlight intensity. The rate of water vaporization reached 30.25% - 38.18% for lutjanus campechanus, and 53.30% - 57.13% for stolephorus commersonii, Lac.).  Keywords : Hybrid Dryer, Water Content, Temperature, Solar Collector and Energy Fuel Gas.
Co-Authors Ahmad Syuhada M. Nizar Machmud Muhammad Hatta