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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.  
A Numerical Study on the Effectiveness of U-Shaped Steel Metallic Dampers Applied to Braced Building Structures under Dynamic Loading Efrizal; Eka Satria; Irsal Oktofirnof; M. Raffi Akbar; Lovely Son; Dendi Adi Saputra; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol. 10 No. 1 (2026): METAL : Jurnal Sistem Mekanik dan Termal
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.10.1.8-15.2026

Abstract

The increasing demand for seismic-resilient structures has encouraged the development of advanced energy dissipation devices capable of reducing structural damage under strong ground motions. Among various passive control systems, metallic dampers have gained significant attention due to their stable hysteretic behavior, high energy dissipation capacity, and simplicity of installation. This study investigates the seismic performance of a building structure equipped with U-shaped steel metallic dampers installed within a chevron bracing system. The research is conducted through two complementary analytical stages. First, a detailed nonlinear finite element analysis is performed to evaluate the cyclic behavior of the U-shaped damper, accounting for both material and geometric nonlinearities. The resulting hysteresis curves are used to determine the elastic stiffness and energy dissipation capacity of the damper. In the second stage, the obtained mechanical properties are implemented into a dynamic numerical model of a multi-story building, where the damper is represented as spring element connecting the bracing system to the main structural frame. Linear time-history analyses are then conducted under earthquake ground motions to assess the dynamic response of the structure. The seismic performance of the damped structure is compared with that of an identical structure without metallic dampers in term of dynamic response. The results demonstrate that the proposed U-shaped metallic damper significantly enhances seismic performance by reducing structural demands and concentrating inelastic deformations within replaceable energy-dissipating components
Effectiveness of Roof Structures as Dynamic Vibration Dampers in Buildings under Dynamic Loading Zeki Midi; Eka Satria; Irsal Oktofirnof; M. Raffi Akbar; Lovely Son; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol. 10 No. 1 (2026): METAL : Jurnal Sistem Mekanik dan Termal
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.10.1.78-87.2026

Abstract

Buildings located in earthquake-prone regions are vulnerable to dynamic responses that may cause severe structural damage if not effectively controlled. One emerging approach for seismic response mitigation is the utilization of roof structures as dynamic damping systems. By appropriately tuning the mass, stiffness, and damping characteristics, roof structures can function as dynamic vibration absorbers through interaction with the main structural system. This study evaluates the effectiveness of roof structures acting as dynamic dampers in reducing the seismic responses of buildings. The research is conducted in two stages. The first stage involves a static analysis of U-shaped metallic dampers using the finite element method to determine stiffness and energy dissipation characteristics based on hysteresis curves obtained from cyclic loading. The second stage consists of a dynamic analysis in which the building structure and roof are modeled as a two-dimensional frame system, with metallic dampers installed between the building and the roof. Damper parameters are adopted from the static analysis results, while the roof mass is analytically determined to ensure its effectiveness as a dynamic damper. Dynamic analyses under earthquake excitation are performed to evaluate the reduction in structural displacement. The results indicate that roof-based damping systems can significantly reduce peak dynamic responses, particularly roof displacement and inter-story drift, demonstrating their potential to enhance the seismic performance of buildings in earthquake-prone regions
PENENTUAN POSISI RETAK PADA PLAT MELALUI ANALISIS KURVA MODUS GETAR Ferdian Kusuma; Meifal Rusli; Mulyadi Bur
Jurnal Sains dan Teknologi Vol 19 No 2 (2020): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Retak adalah salah satu masalah yang sering terjadi pada suatu struktur mekanik. Identifikasi retak merupakan aspek penting dalam menentukan kondisi suatu struktur. Structural Health monitoring menjadi salah satu solusi untuk mendeteksi retak. Secara teoritis, jika terdapat retak awal dan menjalar, frekuensi pribadi suatu struktur dan kurva modus getar akan berubah karena penurunan kekakuan. Pada artikel ini akan dibahas tentang metode untuk menentukan posisi retak pada plat melalui perubahan kurva modus getar. Metode yang dikembangkan berdasarkan analisis modus getar eksperimental, yang fokus pengamatannya pada bentuk modus getar. Sebagai pembanding juga disusun sebuah program komputasi berbasis model elemen hingga. Untuk uji coba pertama, plat tanpa retak diidentifikasi dengan Experimental modal analysis (EMA) dan dimodelkan dengan model elemen hingga (MEH). Selanjutnya, retak buatan diberikan pada plat dengan 2 retak. Posisi retak diidentifikasi menggunakan perubahan nilai kurva modus getar. Hasil yang diperoleh menunjukkan bahwa perubahan kurva modus getar dapat digunakan untuk mendeteksi posisi retak pada plat dan berdasarkan eksperimental memberikan hasil yang sama bagus dengan menggunakan simulasi model elemen hingga. Hal lain yang diperoleh dalam penelitian ini adalah penurunan nilai frekuensi pribadi. Berdasarkan simulasi Autodesk Inventor 2013 dan eksperimental menunjukkan bahwa suatu struktur mengalami kerusakan atau retak tidak dapat dilihat dari 1 atau 2 frekuensi pribadi saja, melainkan banyak frekuensi pribadi.
Co-Authors Deli Usman Dendi Adi Saputra M, Dendi Adi Efrizal Eka Satria Ferdian Kusuma Ferdian Kusuma Firman Zain Hendery Dahlan, Hendery Ilham Fahmi Irsal Oktofirnof Islahuddin Islahuddin Lovely Son, Lovely M. Raffi Akbar Meifal Rusli Muchlisinalahuddin Muhammad Jihad Islami Rahim Isnan Al Hilman Rahmatsyah Maksum Ramsi Rahmi Safitri Rozi Saferi Sepriyanto Sepriyanto Syamsul Huda Syamsul Huda Zeki Midi