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Experimental study of model-based feedforward control of longitudinal wave transmission through hollow cylinders

: Pelinescu, I.; Balachandran, B.

Davis, L.P. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Smart Structures and Materials 2002 - Smart Structures and Integrated Systems : 18 - 21 March 2002, San Diego, USA
Bellingham/Wash.: SPIE, 2002 (SPIE Proceedings Series 4701)
ISBN: 0-8194-4449-9
Conference "Smart Structures and Materials - Smart Structures and Integrated Systems" <2002, San Diego/Calif.>
Conference Paper
Fraunhofer IBMT ()
model based feedforward control; longitudinal wave transmission; hollow cylinder; closed-loop control; experimental modal analysis; actuator-strut ensemble; boundary control algorithm; partial differential equation model; boundary-value problem; harmonic vibratory disturbance; vibration attenuation; magnetostrictive actuator; model-based control

Experimental studies of closed-loop control of longitudinal wave transmission through a hollow cylinder are presented in this article. Model studies coupled with experimental modal analysis are used to understand and characterize the actuator-strut ensemble, and a boundary control algorithm, which falls under the class of feedforward control schemes, is experimentally implemented. The algorithm is based on a partial differential equations (PDE) model of the strut-actuator system, and a combination of strain and acceleration measurements are used to solve the boundary-value problem in the implementation. Harmonic vibratory disturbances are transmitted in the frequency range extending up to 1 kHz, and it has been demonstrated that a vibration attenuation of up to 16 dB can be achieved by using a magnetostrictive actuator in this model-based control scheme.