22 July 1993 Performance of a programmable structure
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Abstract
A performance study of a prototype programmable structure is presented. The programmable structure considered here consists of a self-sensing actuator imbedded in a beam with a self- contained surface mounted control module. The structure is powered by a 9 volt battery (external). Active control is implemented through the use of a positive position feedback filter which suppresses vibration in the beam. The results of the experimental implementation of a programmable structure are presented. An identification of the physical parameters using modal techniques is performed. These physical parameters are then used to perform a parameter study to illustrate the performance capabilities of a programmable structure. The programmable beam presented here is capable of reducing the settling time of the beam by an order of magnitude. This corresponds to an order of magnitude increase in the damping ratio. Similar results can be obtained by using passive damping treatment in the form of constrained layers. In contrast, however, the programmable structure is capable of adapting to changing operating conditions whereas passive damping treatments are designed for a single performance objective.
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Craig Asckler, Craig Asckler, James P. Calamita, James P. Calamita, Daniel J. Inman, Daniel J. Inman, } "Performance of a programmable structure", Proc. SPIE 1919, Smart Structures and Materials 1993: Mathematics in Smart Structures, (22 July 1993); doi: 10.1117/12.148405; https://doi.org/10.1117/12.148405
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