"Plo\u0161n\u00E9 akustick\u00E9 metamateri\u00E1ly s aktivn\u00EDm \u0159\u00EDzen\u00EDm akustick\u00E9 impedance" . . . "The proposed project focuses on a basic research of design tools and fundamental properties of planar acoustic metamaterials and a research of methods for control of their acoustic impedance in changing operational conditions. Acoustic tunable metamaterials will be realized as multilayer composite shells with piezoelectric elements. Active control of their acoustic impedance will be realized by connecting the piezoelectric elements to active electric shunt circuits with negative impedance converters or gyrators. Methods of adaptive piezoelectric shunt damping will be researched. Design of metamaterials with given acoustic impedance will be realized using Finite Element Method simulations. The acoustic properties of the realized metamaterials will be evaluated using acoustic transmission loss and acoustic absorption coefficient measurements. Static and dynamic displacements of metamerials produced by electric voltage will be measured using Digital Holographic Interferometry. The project results will be applicable in a design of noise shielding systems, sound-absorbing panels, etc."@en . "0"^^ . . . . "Planar acoustic metamaterials with the active control of acoustic impedance"@en . "13"^^ . . "13"^^ . . "2015-12-31+01:00"^^ . . . . " piezoelectric transducer" . "http://www.isvav.cz/projectDetail.do?rowId=GA13-10365S"^^ . . "GA13-10365S" . . "2014-05-16+02:00"^^ . . . . . "2015-04-23+02:00"^^ . "acoustic metamaterial" . . " control of acoustic impedance" . "acoustic metamaterial; control of acoustic impedance; piezoelectric transducer; adaptive piezoelectric shunt damping"@en . . . "1"^^ . "2013-02-01+01:00"^^ . "1"^^ . "Podstatou projektu je v\u00FDzkum n\u00E1vrhov\u00FDch metod a z\u00E1kladn\u00EDch vlastnost\u00ED plo\u0161n\u00FDch akustick\u00FDch metamateri\u00E1l\u016F a d\u00E1le v\u00FDzkum metod pro aktivn\u00ED \u0159\u00EDzen\u00ED jejich akustick\u00E9 impedance v prom\u011Bnn\u00FDch pracovn\u00EDch podm\u00EDnk\u00E1ch. Akustick\u00E9 laditeln\u00E9 (aktivn\u00ED) mematamateri\u00E1ly budou realizov\u00E1ny jako vrstven\u00E9 kompozitn\u00ED sko\u0159epiny s piezoelektrick\u00FDmi prvky. Aktivn\u00EDho \u0159\u00EDzen\u00ED jejich akustick\u00E9 impedance bude doc\u00EDleno p\u0159ipojen\u00EDm piezoelektrick\u00E9 \u010D\u00E1sti metamateri\u00E1lu k aktivn\u00EDmu elektrick\u00E9mu jednobranu se z\u00E1porn\u00FDm impedan\u010Dn\u00EDm m\u011Bni\u010Dem nebo gyr\u00E1torem. Budou vyv\u00EDjeny adaptivn\u00ED metody tlumen\u00ED tzv. Piezoelectric shunt damping. N\u00E1vrh metamateri\u00E1lu s po\u017Eadovan\u00FDmi vlastnostmi bude proveden pomoc\u00ED simulac\u00ED metodou kone\u010Dn\u00FDch prvk\u016F. Akustick\u00E9 vlastnosti realizovan\u00E9ho metamateri\u00E1lu budou zhodnoceny m\u011B\u0159en\u00EDm akustick\u00E9 p\u0159enosov\u00E9 ztr\u00E1ty, koeficientu absorpce, apod. Statick\u00E9 a dynamick\u00E9 v\u00FDchylky metamateri\u00E1lu zp\u016Fsoben\u00E9 elektrick\u00FDm nap\u011Bt\u00EDm budou m\u011B\u0159eny digit\u00E1ln\u00ED holografickou interferometri\u00ED. V\u00FDsledkem projektu jsou metody a n\u00E1vrhov\u00E9 n\u00E1stroje aplikovateln\u00E9 v designu syst\u00E9m\u016F protihlukov\u00FDch \u0161t\u00EDt\u016F, zvukov\u011B-absorp\u010Dn\u00EDch panel\u016F, apod." .