Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/FD5243D3-AC17-49B8-B885-5200BC2735E6 | ||
| Year | 2025 | ||
| Type of Item | Diploma Work | ||
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| Bibliographic Citation | Eleftherios Kalamaras, "Computational modal analysis of zigzag shim springs for hybrid vibration energy harvesters", Diploma Work, School of Production Engineering and Management, Technical University of Crete, Chania, Greece, 2025 https://doi.org/10.26233/heallink.tuc.103553 | ||
| Appears in Collections |
This thesis focuses on the study and modeling of zigzag-type springs intended for use in microelectromechanical systems (MEMS) devices. The study includes the evaluation of the mechanical strength of the zigzag springs under various loading conditions, as well as the analysis of their natural frequencies and corresponding mode shapes. The analyses were performed using the commercial software Ansys.Within this framework, parametric analyses were conducted to achieve optimal spring design for more efficient energy harvesting during oscillation. To this end, springs of varying lengths and different support positions were tested, aiming for natural frequencies that result in large oscillation amplitudes.Subsequently, once the resonance frequencies and corresponding amplitudes were identified, adjustments to the spring parameters were made to reduce the frequency gap (in Hertz) between these resonances, enabling their convergence. This convergence is expected to result in continuous energy absorption during the spring’s vibration.The work concludes with the calculation of the total power generated by the oscillation of the zigzag spring. Specifically, it was found that the system exhibits two main resonance regions, around 13 Hz and 30 Hz, where a significant increase in generated power occurs, with peak values of 8.2 mW at 13 Hz and 3.1 mW at 29.75 Hz.
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