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Design of passive piezoelectric damping for space structuresPassive damping of structural dynamics using piezoceramic electromechanical energy conversion and passive electrical networks is a relatively recent concept with little implementation experience base. This report describes an implementation case study, starting from conceptual design and technique selection, through detailed component design and testing to simulation on the structure to be damped. About 0.5kg. of piezoelectric material was employed to damp the ASTREX testbed, a 500kg structure. Emphasis was placed upon designing the damping to enable high bandwidth robust feedback control. Resistive piezoelectric shunting provided the necessary broadband damping. The piezoelectric element was incorporated into a mechanically-tuned vibration absorber in order to concentrate damping into the 30 to 40 Hz frequency modes at the rolloff region of the proposed compensator. A prototype of a steel flex-tensional motion amplification device was built and tested. The effective stiffness and damping of the flex-tensional device was experimentally verified. When six of these effective springs are placed in an orthogonal configuration, strain energy is absorbed from all six degrees of freedom of a 90kg. mass. A NASTRAN finite element model of the testbed was modified to include the six-spring damping system. An analytical model was developed for the spring in order to see how the flex-tensional device and piezoelectric dimensions effect the critical stress and strain energy distribution throughout the component. Simulation of the testbed demonstrated the damping levels achievable in the completed system.
Document ID
19950005752
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Hagood, Nesbitt W., IV
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Aldrich, Jack B.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Vonflotow, Andreas H.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1994
Publication Information
Publisher: NASA
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
NASA-CR-4625
NAS 1.26:4625
Accession Number
95N12165
Funding Number(s)
CONTRACT_GRANT: NAS1-19381
PROJECT: RTOP 590-14-91-52
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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