Ciminello, Monica (2009) Semi-Passive Control Strategy using Piezoceramic Patches in Non Linear Commutation Architecture for Structural-Acoustic Smart Systems. [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: Semi-Passive Control Strategy using Piezoceramic Patches in Non Linear Commutation Architecture for Structural-Acoustic Smart Systems
Creators:
CreatorsEmail
Ciminello, Monicamonica.ciminello@gmail.com
Date: 27 November 2009
Number of Pages: 200
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria aerospaziale
Doctoral School: Ingegneria industriale
PHD name: Ingegneria aerospaziale, navale e della qualità
PHD cycle: 22
PHD Coordinator:
nameemail
Moccia, Antonioantonio.moccia@unina.it
Tutor:
nameemail
Lecce, Leonardoleonardo@unina.it
Ohayon, RogerUNSPECIFIED
Date: 27 November 2009
Number of Pages: 200
Uncontrolled Keywords: semi-passive control piezoceramic actuator smart structures
MIUR S.S.D.: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/04 - Costruzioni e strutture aerospaziali
Additional Information: The Italian-French doctoral convention has been approved between the University of Naples "Federico II" and the Conservatoire National des Arts et Métiers (CNAM) under the protocol signed by the Ministries of Foreign Affairs and the University of France and Italy.
Date Deposited: 20 May 2010 08:01
Last Modified: 30 Apr 2014 19:38
URI: http://www.fedoa.unina.it/id/eprint/3830

Abstract

The demands for novel smart damping materials can be summarized in: external power source not required for operation; device not needing to be tuned to a specific frequency; device operation not affected by changes in modal frequency; device suppressing vibration over a number of modes, weight and size minimized; self-contained unit device. This thesis focuses on these points and it shows that the dilemma between active and passive vibration control may be solved with a new approach, implementing a semipassive technique without penalties in terms of robustness and performance. Connecting a shunt circuit to a piezoelectric transducer leads to a simple and low cost vibration controller that is able to efficiently suppress unwanted structural vibrations: this is a way to fulfil the abovementioned demands. The objective of this work is to develop and validate by an experimental campaign a computational tool integrated with finite element Nastran software. An original 4-channel switched shunt control system has been realized using a tachometer device. The control system has been tested first of all on a simple cantilevered beam attaining a max vibrations reduction of 16.2 dB for the first bending mode. Further reference test article consisted of a 10 ply fibreglass laminate plate. A multimodal control has applied within a band range of 700Hz including the first seven modes. A maximum reduction of 16 dB has been found. Further numerical and experimental tests have been planned to extend the ability of the SSC to produce structural-borne sound reduction in acoustic rigid cavities for fluid-structure interaction problems. Numerical sound power radiation of an aluminium plate, controlled by synchronized switch system, compared with the experimental acoustic energy detected in acoustic room, has been planned in the ongoing activities.

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