Abstract
A vibration-based energy harvester (VEH) utilizes vibrations originated from various structures and specifically maximizes the displacement of its moving parts, using the resonance between the frequency of external vibration loads from the structure and the natural frequency of VEH to improve power production efficiency. This study presents the procedure to evaluate the structural performance and structural integrity of VEH utilized in a railway vehicle under frequency domain. First of all, a structural performance test was performed to identify the natural frequency and assess the structural response in frequency domain. Then, the static structural analysis was carried out using FE analysis to investigate the failure critical locations (FCLs) and effect of resonance. Finally, we conducted a frequency response analysis to identify the structural response and investigate the structural integrity in frequency domain. Based on these results, the authors assessed the structural performance and integrity of VEHs in two versions.
Highlights
Structural defects or environmental factors have often led to the collapse or breakdown of structures [1,2,3]
The performance and structural integrity of vibration-based energy harvester (VEH) should be studied taking into consideration the resonance between the excitation loads and VEHs
From the frequency response analysis, the authors could obtain the stress, displacement, and acceleration response taking into consideration the resonance at hot spots (FCLs) in frequency domain
Summary
Structural defects or environmental factors have often led to the collapse or breakdown of structures [1,2,3]. A typical example is a system for real-time monitoring for structural integrity This technique is used to inspect abnormalities in the components or structures using sensors and measuring instruments, thereby predicting the damage caused by defects [4]. Ozsoy et al [17] performed a vibration test and analysis for the components of a helicopter and proposed a method of evaluating the structural performance These studies reported adequate results for the structural performance evaluation of traditional structures; they have not considered the resonance between the excitation and the structures. We conducted frequency response analysis to identify the stress at the FCL along with the frequency Using these results, the authors studied the structural performance and integrity of VEHs in two versions considering the resonance between external force and natural frequency
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