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All Journal Jurnal Energi Dan Manufaktur Jurnal Sains dan Teknologi Rekayasa Mesin Jurnal Teknik Mesin Jurnal Teknik Mesin Indonesia METAL : Jurnal Sistem Mekanik dan Termal
Mulyadi Bur
Universitas Andalas
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Respon Landing Gear pada Pesawat Tanpa Awak Saat Mendarat Lovely Son; Firman Zain; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 2 (2020): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2189.765 KB) | DOI: 10.25077/metal.4.2.87-93.2020

Abstract

Penelitian ini membahas tentang analisis respon dinamik pada landing gear pesawat tanpa awak saat mendarat. Penelitian diawali dengan pemodelan mekanisme landing gear untuk mendapatkan harga kekakuan dan redaman ekivalen. Penurunan persamaan gerak dilakukan dengan asumsi sistem getaran satu derajat kebebasan. Respon sistem dihitung dari persamaan gerak secara analitik. Simulasi numerik dilakukan untuk mendapatkan grafik respon simpangan dan percepatan. Evaluasi respon sistem dilakukan untuk sejumlah variasi dimensi batang dan kekakuan pegas pada mekanisme landing gear. Dari hasil simulasi ditunjukkan bahwa harga maksimum amplitudo respon percepatan berbanding terbalik dengan harga maksimum amplitudo respon simpangan. Disamping itu, peningkatan harga kekakuan pegas ks menyebabkan meningkatnya harga maksimum respon percepatan dan mengurangi amplitudo respon simpangan pada landing gear.
The Analysis of Loosening of Bolt Connection Due to Structural Vibration Through Changes in Dynamic Characteristics Rahmatsyah Maksum Ramsi; Meifal Rusli; Mulyadi Bur
Jurnal Teknik Mesin Vol 16 No 1 (2023): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.16.1.1091

Abstract

Bolted joints are generally used to connect two or more mechanical structures due to their ease of assembly and disassembly for maintenance. However, the problem of vibration is one of the main challenges when the tightness of the bolted joints is insufficient, causing failures such as looseness and resulting in disconnection. Looseness is the most common cause of dynamically loaded bolted joint structure failure. This study tested a simple bolt joint structure to observe the looseness indication of the bolt joint after it was vibrated using a shaker in a single-frequency excitation. A freely fixed beam consisting of two beams connected by a bolt and subjected to varying bolt tightening torques. Then the response measurement is carried out by recording the FRF graph obtained from loosening and tightening bolt torque effects. Modal parameters such as personal frequency and damping ratio were collected through experimental modal analysis (EMA). It was found that the structure’s vibration could change the conditions of loosening or lower tightening torque indicated by shifting the structure’s natural frequency. In addition, the damping characteristics are also affected by changes in the tightening torque. Especially when conditions are loose, the damping ratio becomes much higher than that of tightening.
PENGARUH CLEARANCE DAN PEMBEBANAN RADIAL TERHADAP PERPINDAHAN, DISTRIBUSI BEBAN KONTAK, DAN KEKAKUAN ELEMEN ROL PADA SPHERICAL ROLLER BEARING Hendery Dahlan; Rahmi Safitri; Meifal Rusli; Mulyadi Bur
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1065

Abstract

This study aims to determine the effect of clearance and loading regarding to the displacement, distribution of contact loads and stiffness of spherical roller bearings at rest. The displacement formulation of the inner ring of the bearing was developed by defining the angle of inclination of the roller element to the axis of shaft. The comparison between exact calculations using the Matlab program and numerical modeling with MSC Marc for the displacement has an error value of less than 10%. Therefore, the displacement formulation of the inner ring of the bearing is used to calculate the exact distribution of contact load and stiffness of the spherical roller bearing and numerical modeling. The results revealed that the effect of clearance and loading on the displacement of the inner ring of the spherical roller bearing is directly proportional. The contact load of the bearing roller element is distributed over the part of the roller element that is in contact with its path, where the largest contact load occurs at the position of the roller element parallel to the axis of the shaft at rest. Meanwhile, bearing stiffness will decreases with increasing the value of clearance.  
Co-Authors Deli Usman Ferdian Kusuma Ferdian Kusuma Firman Zain Hendery Dahlan, Hendery Ilham Fahmi Islahuddin Islahuddin Lovely Son, Lovely Meifal Rusli Muchlisinalahuddin Muhammad Jihad Islami Rahim Isnan Al Hilman Rahmatsyah Maksum Ramsi Rahmi Safitri Rozi Saferi Sepriyanto Sepriyanto Syamsul Huda Syamsul Huda