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Title
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On Piezoelectric Energy Conversion for Electronic Passive Damping Enhancement
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Description
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To meet their performance requirements, large orbiting space structures are expected to need both passive and active vibration suppression systems. Ideally these systems would replace structural members with members possessing both structural and dissipative properties.
The design and development of concepts of enhanced~damping struts that employ the mechanical/electrical conversion properties of piezoelectric materials is presented. Rather than mechanically dissipating energy, the strain-induced mechanical vibration is converted to electrical energy which is shunted through a tuned electrical network. The networks use a shunted inductance which acts in concert with the inherent reactance of the piezoelectric material to maximize the current dissipated.
Because of the relatively low structural frequencies and large piezoelectric capacitance, inductances on the order of tens to hundreds of Henries are required. A means of using operational amplifiers to simulate the inductance is presented .. This substitution eliminates the substantial dead weight of the inductance, and allows for fine-tuning and programming of the inductance to match variations in frequency. A means of adding damping for several frequencies is given. Finally, experimental results are presented.
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Creator
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Edberg, D. L.
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Bicos, A. S.
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Fechter, J. S.
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Publisher
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Wright-Patterson Air Force Base, OH : Wright Laboratory, Flight Dynamics Directorate, Air Force Systems Command
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Date
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1991
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Format
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1 online resource (10 pages)
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Type
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article
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Abstract
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To meet their performance requirements, large orbiting space structures are expected to need both passive and active vibration suppression systems. Ideally these systems would replace structural members with members possessing both structural and dissipative properties.
The design and development of concepts of enhanced~damping struts that employ the mechanical/electrical conversion properties of piezoelectric materials is presented. Rather than mechanically dissipating energy, the strain-induced mechanical vibration is converted to electrical energy which is shunted through a tuned electrical network. The networks use a shunted inductance which acts in concert with the inherent reactance of the piezoelectric material to maximize the current dissipated.
Because of the relatively low structural frequencies and large piezoelectric capacitance, inductances on the order of tens to hundreds of Henries are required. A means of using operational amplifiers to simulate the inductance is presented .. This substitution eliminates the substantial dead weight of the inductance, and allows for fine-tuning and programming of the inductance to match variations in frequency. A means of adding damping for several frequencies is given. Finally, experimental results are presented.
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Date Issued
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1991-08
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Extent
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10
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Corporate Author
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McDonnell Douglas Space Systems Company
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McDonnell Douglas Electronic Systems Company
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Report Number
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WL-TR-91-3078 Volume II, pages GBA-1 to GBA-10
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DoD Project
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2401
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DoD Task
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240104
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Distribution Conflict
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No
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Index Abstract
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Contrails only
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Photo Quality
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Complete
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Distribution Classification
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1
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Report Availability
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Full text available
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Provenance
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University of Colorado Colorado Springs, Kraemer Family Library
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Identifier
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ADA241312
