Accession Number : ADA601090


Title :   Experimental Robustness Study of Positive Position Feedback Control for Active Vibration Suppression


Descriptive Note : Journal article


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF AERONAUTICS AND ASTRONAUTICS


Personal Author(s) : Song, G ; Schmidt, S P ; Agrawal, B N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a601090.pdf


Report Date : Jan 2001


Pagination or Media Count : 5


Abstract : POSITIVE position feedback (PPF) control was introduced by Goh and Caughey in 1985 to control vibrations of large exible space structures. A PPF controller has several distinguished advantagesas compared to then widely used velocity feedbackcontrol laws. It is insensitive to spillover, where contributions from unmodeled modes affect the control of the modes of interest. As a second-order low-pass lter, a PPF controller rolls off quickly at high frequencies and is well suited to controlling the lower modes of a structure with well separated modes. Because of these advantages, PPF controller along with smart materials, in particular PZT (lead zirconatetitanate) type of piezoelectricmaterial, has been applied to many exible systems to achieve active damping. The design of a PPF controller requires the natural frequency of a structure. In practice, the structuralnatural frequencymay not be known exactlyor itmay varywith time.When the frequencyused in thePPF controller is different from that of the structure, the performance of the PPF control will adversely affected. Despite that PPF control is widely researched in literature, robustness study of PPF control when natural frequency is inexactly known is not reported. This motivates the authors to conduct experimental study of robustness of PPF control in active vibration suppression of a smart exible structure.


Descriptors :   *FEEDBACK , *POSITION(LOCATION) , *SUPPRESSION , *VIBRATION , CONTROL , DAMPING , PIEZOELECTRIC MATERIALS , VELOCITY


Subject Categories : Operations Research
      Cybernetics
      Navigation and Guidance
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE