Accession Number : ADA258823


Title :   An Experimental Determination of the Effects of Blending Collocated and Non-Collocated Sensor Measurements to Control a Flexible Structure


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Cobb, Richard G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258823.pdf


Report Date : Dec 1992


Pagination or Media Count : 134


Abstract : An experimental investigation was performed controlling a cantilevered beam in bending using proportional feedback on a blend of collocated and non-collocated sensor measurements using a single actuator. Exact transfer functions between the control input and the measurements were developed and compared to the finite element method. By analyzing the open loop pole-zero locations as a function of the measurement blending, insight into the closed loop behavior is obtained. Minimum phase behavior can be maintained for a range of the blending ratio. Results using blended control were compared to both proportional collocated feedback and compensated collocated feedback using LQG methods. The comparison was then extended to a theoretical investigation using the blended measurements on a free-free torsional model analogous to a gimbal. Advantages and limitations of using blended measurements are presented.


Descriptors :   *EXCITATION , *FINITE ELEMENT ANALYSIS , *CANTILEVER BEAMS , DETECTORS , CLOSED LOOP SYSTEMS , FLEXIBLE STRUCTURES , THESES , BLENDING


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE