Piezoelectric technology has found growing application due to their capability of developing high forces with precise positioning and performance in terms of repeatability, operational conditions and implementation. Piezoelectric stack actuators are studied in this thesis with the objective of designing a test bench for the characterization of piezo stacks. This work was performed in Phi Drive, a company focused on the development of piezoelectric motors. By knowing the characteristic of piezo stack, Phi Drive would be able to perform a more complete modelling of the motors and hence to improve products performance right from the design and prototype phase. The goal followed by Phi Drive with this work was to improve its knowledge on characterization modalities and steps, but also to enhance the research and development activities. Characterization methods and the practical strategies to undertake for piezo characterization have been reviewed and the specifications needed to design an adequate test bench have been identified. This required also proper design of measurement chain and selection of the sensors to include in the test bench to fit the size constraints for the intended application. A test bench has been designed starting with a functional design followed by finite element verification. Moreover, an experimental analysis has been performed on a mock-up of the test bench, a stage positioning system, already present as prototype in Phi Drive. Performances of the prototype have been compared with expected behaviour from FE modelling to validate the design methodology and consequently the developed setup.
La tecnologia piezoelettrica trova sempre più applicazioni grazie alla sua capacità di sviluppare grande forza con posizionamenti precisi e buone prestazioni in termini di ripetibilità, implementazione e condizioni di lavoro. Gli stack piezoelettrici sono studiati in questa tesi con l’obbiettivo di progettare un banco prova per la loro caratterizzazione. Questo lavoro e stato eseguito in Phi Drive, un’azienda specializzata nello sviluppo di motori piezoelettrici. Conoscendo le caratteristiche dei piezo stack, Phi Drive vorrebbe essere in grado di eseguire una modellazione più completa dei motori e quindi di migliorare le prestazioni dei prodotti fin dalla fase di progettazione e prototipazione. Lo scopo seguito da Phi Drive con questo lavoro, è stato quello di migliorare la propria conoscenza sulle modalità e le fasi della caratterizzazione, ma anche di accrescere le attività di ricerca e sviluppo. I metodi per la caratterizzazione e le strategie pratiche da intraprendere per la caratterizzazione dei piezo sono state approfondite e le specifiche necessarie per la progettazione di un adeguato banco prova sono state identificate. Questo richiede anche un corretto dimensionamento della catena di misura e nella scelta dei sensori da includere nel banco prova per far combaciare le dimensioni geometriche per l’applicazione prevista. Un banco prova è stato progettato partendo con un dimensionamento funzionale seguito da una verifica ad elementi finiti. Oltretutto, un’analisi sperimentale è stata eseguita su una replica del banco prova, uno stadio di posizionamento, già presente come prototipo in Phi Drive. Le prestazioni del prototipo sono state comparate con il comportamento atteso dal modello a elementi finiti per validare il metodo di progettazione e conseguentemente il set up sviluppato.
Design of a test bench for characterization of piezo stack actuators
LIMONTA, NICOLÒ
2016/2017
Abstract
Piezoelectric technology has found growing application due to their capability of developing high forces with precise positioning and performance in terms of repeatability, operational conditions and implementation. Piezoelectric stack actuators are studied in this thesis with the objective of designing a test bench for the characterization of piezo stacks. This work was performed in Phi Drive, a company focused on the development of piezoelectric motors. By knowing the characteristic of piezo stack, Phi Drive would be able to perform a more complete modelling of the motors and hence to improve products performance right from the design and prototype phase. The goal followed by Phi Drive with this work was to improve its knowledge on characterization modalities and steps, but also to enhance the research and development activities. Characterization methods and the practical strategies to undertake for piezo characterization have been reviewed and the specifications needed to design an adequate test bench have been identified. This required also proper design of measurement chain and selection of the sensors to include in the test bench to fit the size constraints for the intended application. A test bench has been designed starting with a functional design followed by finite element verification. Moreover, an experimental analysis has been performed on a mock-up of the test bench, a stage positioning system, already present as prototype in Phi Drive. Performances of the prototype have been compared with expected behaviour from FE modelling to validate the design methodology and consequently the developed setup.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/138501