Full text
| |
| Author(s): |
Eduardo Ascenso Reis Ribeiro
Total Authors: 1
|
| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2022-10-03 |
| Examining board members: |
Carlos Eduardo Nigro Mazzilli;
Guilherme Rosa Franzini;
Paulo Batista Gonçalves;
Stefano Lenci;
Celso Pupo Pesce
|
| Advisor: | Carlos Eduardo Nigro Mazzilli |
| Abstract | |
In this thesis, the phenomenon of modal asynchronicity or modal localisation in structures is addressed. It is shown that asynchronous or localised vibration modes can be exhibited in a variety of structural systems, from discrete linear systems with few degrees of freedom to non-linear continuous systems. Furthermore, such modes are usually robust enough to persist, in the form of nearly-asynchronous vibrations, in the presence of small parameter detuning. The consistence and bulk of the obtained results for the mathematical models indicate that modal asynchronicity is not merely a mathematical singularity inherent to given structural formulations, but in fact a physical phenomenon, able to be reproduced in laboratory and with potentiality for engineering applications. In order to further assess these features, a 3D-printed prototype was built and dynamical tests were performed in laboratory. The obtained results show a good agreement between the experimental data and the associated mathematical model. The applicability of asynchronous vibrations for energy harvesting and vibration control is also discussed and promising research lines for future works are detailed. (AU) | |
| FAPESP's process: | 17/12779-3 - Study of asynchronous modal oscillations in pre-tensioned heavy-chains |
| Grantee: | Eduardo Ascenso Reis Ribeiro |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |