RT - Journal Article T1 - Multi-objective robust active acoustic radiation control of a piezocomposite arbitrary thick rectangular panel JF - mdrsjrns YR - 2015 JO - mdrsjrns VO - 15 IS - 4 UR - http://mme.modares.ac.ir/article-15-3573-en.html SP - 1 EP - 12 K1 - Vibro-acoustic response K1 - ASAC K1 - Intelligent thick plate K1 - Disturbance attenuation K1 - Unstructured uncertainty AB - Active structural acoustic radiation control of a piezolaminated arbitrary thick rectangular plate with a mixed-norm H_2/H_∞ robust controller is developed. The structure is made of a transversely isotropic host layer with a distributed piezoelectric sensor layer as well as a matched piezoelectric actuator layer, facing high frequency uncertainties and random external disturbances. The elasto-acoustic formulation, based on the exact linear 3D piezo-elasticity theory, is developed for problem of fully coupled structure and acoustic mediums. Identification of the fluid/structure interaction system with subspace algorithm is implemented on actuator/sensor data sets. A multi-objective controller with regional pole placement, formulated in LMI framework, is synthesized while unmodeled dynamics are treated as multiplicative uncertainties. Numerical simulations confirm effectiveness of the implemented multi-objective robust active control scheme for reduction of radiated acoustic power from a piezocomposite plate, without stimulating any instability. Also, better tracking performance and disturbance rejection of mixed-norm controller is observed in comparison to that of H_2 and H_∞ controllers. Finally, validity of the elasto-acoustic model is proved by results obtained from a finite element software, as well as with the data available in the literature. LA eng UL http://mme.modares.ac.ir/article-15-3573-en.html M3 ER -