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Sitorus, Hivaldo Ricky
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering

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Natural Frequency of Buildings and Resonance Phenomenon: Impacts on Structural Design kurni, yahya kurniawan; Sitorus, Hivaldo Ricky; Suwarno, Muhammad Edy; Ratu, Jumiati Ratutoli
METALOGRAM Metalogram Vol.01 No.03 (August,2025)
Publisher : Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/mtlg.v1i03.7806

Abstract

This piece explores the inherent frequency of buildings and the associated resonance effect, emphasizing their crucial roles in structural engineering. Grasping the natural frequency is vital for forecasting how structures react to dynamic forces such as earthquakes and strong winds. The research underscores the need to take into account the height and weight of buildings, as these elements affect their natural frequency and subsequently influence their performance during seismic activities. Through both theoretical insights and real-world instances including the Mexico City earthquake of 1985 and a building collapse the article illustrates the dangers posed by resonance when a structure's natural frequency coincides with external vibration frequencies. A particular case study is highlighted to demonstrate superior structural and aerodynamic design approaches aimed at reducing resonance due to seismic and wind effects. This study aspires to act as a guide for engineers and architects in recognizing and tackling resonance-related issues to improve the safety and durability of tall buildings.
Effect of Friction Welding Parameters for Aluminum and Copper kurni, yahya kurniawan; Sitorus, Hivaldo Ricky; Tarigan, Joy Adithia
METALOGRAM Metalogram Vol.01 No.02 (April,2025)
Publisher : Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/mtlg.v2i1.7421

Abstract

Friction welding is a solid-state welding technique that generates heat from friction and pressure to join two metals together. Friction welding includes various techniques, such as friction stir welding, linear friction welding, and continuous drive friction welding. This literature review examines various friction welding techniques, the welding defects that may arise among these methods, and identifies the most appropriate friction welding technique for connecting pump shafts composed of Aluminum and Copper with a circular cross-section, as fusion welding is not applicable for joining Aluminum and Copper. A primary reason is the substantial difference in melting temperature between Aluminum and Copper, approximately. 400 degrees Celsius. Based on the literature review, the outcomes of friction welding may be influenced by rotational speed, duration of pressure, axial pressure force, and the properties of the materials utilized. Employing a case study of the pump shaft, it was determined that the continuous drive friction method is the optimal technique for bonding Aluminum and Copper in the pump shaft, as the temperature distribution can be uniform across the entire weld joint surface. This situation will lead to a more uniform microstructure and weld joint quality.
Co-Authors kurni, yahya kurniawan Ratu, Jumiati Ratutoli Suwarno, Muhammad Edy Tarigan, Joy Adithia