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This work investigates the problem of optimal placement and geometry of piezoelectric sensors and actuators (S/A) to improve active vibration control performance of smart laminated beam. Theoretical formulation is based on efficient layer-wise finite element model along with an optimal control theory. Control theory is implemented in state space format considering a reduced order model. A laminated beam with collocated piezoelectric S/A placed at the top and bottom surfaces has been considered. A series of simulation based on Taguchi design of experiment has been carried out to determine the optimal placement and geometry of the S/A to achieve best control performance that is maximum modal active damping ratio c/minimum settling time with minimum actuator voltage. A multi-criteria optimisation has been performed using Proximity Indexed Value (PIV) integrated with entropy methods. Further, the analysis of mean (ANOM) and analysis of variance (ANOVA) are performed to identify the most significant input parameter based on their percentage contribution. For the smart cantilever beam considered in the analysis, the location of the S/A is the most significant having maximum percentage contribution (35.69%) followed by its length (33.04%) and thickness (24.55%).

New types of polyfunctional molecules formed by Co2+/3+ and Zn2+ ions with various diamines - biogenic 1,4-diaminobutane (dab, putrescine) and 1,1'-binaphthyl-2,2'-diamine (dabn) - have been obtained. The structure of the compounds was determined by single crystal X-ray diffraction analysis. Dab in the binuclear complex [Zn-2(piv)(2)(dab)(2)(Hdab)(2)]center dot 4piv center dot 2H(2)O (1) plays the role of a bridging ligand. The H-binding in 1 promotes the formation of a supramolecular layer which, according to STA data, predetermines the thermal stability up to 100 degrees C. In the mononuclear complex of cobalt(III), [Co-III(piv)(2)(dab)(2)]Cl-+(-) (2), dab is chelated with the metal center. Replacement of dab with dabn leads to solely chelate coordination in complexes of cobalt(II), [Co-3(OH)(piv)(5)(dabn)(2)]center dot 0.5MeCN (3), and zinc, [Zn(dabn)(2)(NO3)(MeCN)]center dot 2NO(3)center dot 0.5MeCN (4). (C) 2020 Elsevier Ltd. All rights reserved.