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Piezoelectric devices for vibration suppression: Modeling and application to a truss structureFor a space structure assembled from truss members, an effective way to control the structure may be to replace the regular truss elements by active members. The active members play the role of load carrying elements as well as actuators. A piezo strut, made of a stack of piezoceramics, may be an ideal active member to be integrated into a truss space structure. An electrically driven piezo strut generates a pair of forces, and is considered as a two-point actuator in contrast to a one-point actuator such as a thruster or a shaker. To achieve good structural vibration control, sensing signals compatible to the control actuators are desirable. A strain gage or a piezo film with proper signal conditioning to measure member strain or strain rate, respectively, are ideal control sensors for use with a piezo actuator. The Phase 0 CSI Evolutionary Model (CEM) at NASA Langley Research Center used cold air thrusters as actuators to control both rigid body motions and flexible body vibrations. For the Phase 1 and 2 CEM, it is proposed to use piezo struts to control the flexible modes and thrusters to control the rigid body modes. A tenbay truss structure with active piezo struts is built to study the modeling, controller designs, and experimental issues. In this paper, the tenbay structure with piezo active members is modelled using an energy method approach. Decentralized and centralized control schemes are designed and implemented, and preliminary analytical and experimental results are presented.
Document ID
19930009657
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Won, Chin C.
(Lockheed Engineering and Sciences Co. Hampton, VA., United States)
Sparks, Dean W., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Belvin, W. Keith
(NASA Langley Research Center Hampton, VA, United States)
Sulla, Jeff L.
(Lockheed Engineering and Sciences Co. Hampton, VA., United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1993
Publication Information
Publication: The Fifth NASA(DOD Controls-Structures Interaction Technology Conference, Part 1
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
93N18846
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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