摘要:

Electrochemically prepared methoxyethoxide solutions have been suggested as precursors for sol-gel technology. Methoxyethoxides demonstrate higher stability in organic solvents than alkoxides; chelating properties of the ether oxygen cause considerable stability of methoxyethoxides to hydrolysis in comparison with the derivatives of aliphatic alcohols. This makes methoxyethoxides promising precursors for oxide synthesis. Methoxyethanol proved an exceptionally convenient solvent for electrochemical synthesis. The electrochemically prepared solutions demonstrate unique film-forming properties and were used for synthesis of the films of complex perovskites BaM111/3Mv2/3O3(M11= Zn, Co, Ni; Mv= Nb, Ta), yttrium-stabilized ZrO2, PZT.

ISSN:1058-4587    

DOI:10.1080/10584589408017031

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Smart materials of lead-zirconate-titanate (PZT) piezoelectric ceramics have attracted attention in recent years for active vibration control, acoustic noise suppression, health monitoring and damage assessment. We at McDonnell Douglas Aerospace have been studying these ceramics for use as sensors and actuators in various space and aircraft structures. In this paper, we will report results of a recent study on active vibration control using monomorph PZT actuators. The experiments were performed on thin aluminum cantilever beams. Collocated and non-collocated sensors and actuators were employed. Two control techniques: the classical velocity feedback and adaptive feedback controls, were investigated. We have obtained significant damping and broadband vibration attenuation of greater than 30 dB using the classical control with the single-input single-output feedback approach. A 24 dB reduction has also been achieved using the adaptive control with the multiple-input single-output approach. Detailed experimental methods and results will be described.

ISSN:1058-4587    

DOI:10.1080/10584589408017032

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor