This thesis is a summary in the MEMS (micro-electro-mechanical systems) and to examine a several piezoelectric beams under magnetic forces to perfectly optimize and harvest the energy generated. This thesis took place under supervision of Professor Raffaele Ardito and co-supervisor D. Michele Rosso. This thesis involved an in-depth study of the linear dynamics of the piezoelectric structures intended to be components of energy harvester. The activity carried out is to be considered as the starting point of subsequent thesis work which will concern carrying out the development of an energy harvester prototype, which is a system collecting kinetic energy from an environmental source. Coming to the detail of the thesis, the work is divided into two parts, the first part is a theoretical study of dynamics of structures, a study of piezoelectricity and energy harvesters. The second part is a computational analysis of a classical piezoelectric unimorph cantilevers subjected to various conditions and with harmonic forcing function. Duo to its compatibility with MEMS and Integrated Circuit (IC), the AlN (Aluminum Nitride) is the piezoelectric material used for the energy harvesters in this thesis. The analysis is carried out with COMSOL Multiphysics which works by means of FE (finite element) method. Additionally, discussions and comparisons between the various performances and concepts for the future work are made.
Questa tesi è una sintesi nei MEMS (sistemi microelettromeccanici) e per esaminare diversi fasci piezoelettrici sotto forze magnetiche per ottimizzare e raccogliere perfettamente l'energia generata. Questa tesi si è svolta sotto la supervisione del Prof. Raffaele Ardito e del correlatore D. Michele Rosso. Questa tesi ha comportato uno studio approfondito della dinamica lineare delle strutture piezoelettriche destinate ad essere componenti di energy harvester. L'attività svolta è da considerarsi come punto di partenza del successivo lavoro di tesi che riguarderà la realizzazione di un prototipo di energy harvester, che è un sistema che raccoglie energia cinetica da una fonte ambientale. Venendo al dettaglio della tesi, il lavoro si divide in due parti, la prima parte è uno studio teorico della dinamica delle strutture, uno studio della piezoelettricità e degli energy harvester. La seconda parte è un'analisi computazionale di un classico cantilever piezoelettrico unimorfo sottoposto a varie condizioni e con funzione di forzatura armonica. Grazie alla sua compatibilità con MEMS e Circuito Integrato (IC), l'AlN (nitruro di alluminio) è il materiale piezoelettrico utilizzato per gli energy harvester in questa tesi. L'analisi viene eseguita con COMSOL Multiphysics che funziona mediante il metodo FE (finite element). Inoltre, vengono fatte discussioni e confronti tra le varie performance e concetti per il lavoro futuro.
Linear vibrations and modelling of a piezoelectric based energy harvester with a study of magnetic forces
MOHSEN, MUHAMMED ABDUL NASSER ELSAYED MUHAMMED
2021/2022
Abstract
This thesis is a summary in the MEMS (micro-electro-mechanical systems) and to examine a several piezoelectric beams under magnetic forces to perfectly optimize and harvest the energy generated. This thesis took place under supervision of Professor Raffaele Ardito and co-supervisor D. Michele Rosso. This thesis involved an in-depth study of the linear dynamics of the piezoelectric structures intended to be components of energy harvester. The activity carried out is to be considered as the starting point of subsequent thesis work which will concern carrying out the development of an energy harvester prototype, which is a system collecting kinetic energy from an environmental source. Coming to the detail of the thesis, the work is divided into two parts, the first part is a theoretical study of dynamics of structures, a study of piezoelectricity and energy harvesters. The second part is a computational analysis of a classical piezoelectric unimorph cantilevers subjected to various conditions and with harmonic forcing function. Duo to its compatibility with MEMS and Integrated Circuit (IC), the AlN (Aluminum Nitride) is the piezoelectric material used for the energy harvesters in this thesis. The analysis is carried out with COMSOL Multiphysics which works by means of FE (finite element) method. Additionally, discussions and comparisons between the various performances and concepts for the future work are made.File | Dimensione | Formato | |
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Descrizione: Linear Vibrations & Modelling of a Piezoelectric Based Energy Harvester with a Study of Magnetic Forces
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https://hdl.handle.net/10589/195592