Modal analysis and active vibration control of the Naval Postgraduate School Space Truss

Loading...
Thumbnail Image
Authors
Johnson, Scott E.
Vlattas, John
Subjects
Active vibration control
Piezoceramic actuators
Modal testing
Modal analysis
Advisors
Agrawal, Brij N.
Song, Gangbing
Date of Issue
1998-06-01
Date
June 1998
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
This thesis examines active control of the Naval Postgraduate School (NPS) Space Truss using a piezoceramic stack actuator. Preceding the development of an active control mechanism for the NPS space truss, modal testing was performed to identify the modal properties of the truss. An impact hammer provided excitation to the truss and accelerometers easured the truss' response. Two data acquisition systems were used independently to gather and analyze data. For active control, an active strut, consisting of a piezoceramic stack, a force transducer, and mechanical interfaces, was substituted in place of a critical diagonal strut and acted as a control actuator. The frequency response of the system was determined and a integral plus double-integral force feedback control law was designed and implemented. A linear proof mass actuator was employed to excite one of the truss' vibrational modes. The controller then suppressed the vibration along the length of the structure resulting in power attenuation on the order of 10- 15 dB. Various combinations of velocity and position feedback gains were investigated in order to optimize the control action. Additional testing was performed to determine the controller's sensitivity over a frequency band.
Type
Thesis
Description
Series/Report No
Department
Department of Aeronautical and Astronautical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
xix, 228 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Collections