Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/79F10340-DF1B-48E6-A751-D3A0640E1714 | ||
| Year | 2025 | ||
| Type of Item | Diploma Work | ||
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| Bibliographic Citation | Mihai Ionut Trandafir, "Design of a contactless nonlinear energy sink for torsional vibration suppression", Diploma Work, School of Production Engineering and Management, Technical University of Crete, Chania, Greece, 2025 https://doi.org/10.26233/heallink.tuc.103025 | ||
| Appears in Collections |
Since an internal combustion engine provides torque only during one of the four phases of each piston’s movement, and due to the "Backlash" phenomenon, which arises as a result of the difference in the acceleration of the gears in a gearbox, torsional vibrations are generated at different frequencies that affect the vehicle and the driver. Traditional vibration absorbers are tuned to specific engine orders and thus are limited to narrowband attenuation. For this reason, a nonlinear energy sink (NES) will be designed to absorb these torsional vibrations. The nonlinearity of such a sink makes it ideal for this application as it has energy-dependent resonant response. To achieve this nonlinearity, magnets will be used. The reason magnets are used is the contactless nature of the applied magnetic torque and the flexible scaling of the required magnitude by manipulating the positions of the magnets and the intensity of the magnetic fields. Simulations of the restoring torque must be made, using Simcenter Magnet in order to find the right parameters for the NES. Then, using NX Siemens, the NES must be designed and be printed using additive manufacturing. Then, a static experiment must be done to compare the restoring torque of the manufactured NES compared to the one simulated. Last but not least, a dynamic experiment must be done to compare the manufactured NES’s dynamic properties to the simulated one.
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