. . "RIV/68407700:21220/04:02100768" . . "Reduction of Noise Generated by Damper" . "[919022D0FC4B]" . "583920" . . "Sni\u017Eov\u00E1n\u00ED hluku generovan\u00E9ho klapkami"@cs . "air-conditioning; airflow; duct acoustic; noise of damper; throttle regulation"@en . . "The flow of air through ducts is mainly controlled by throttling (except for the control of the performance of fans, where variating speed is used). All throttling elements are sources of aerodynamic noise. The most common throttling elements in air conditioning systems are butterfly (single-blade) or multiblade dampers. The main object of the present paper is an analysis of the working characteristic of a butterfly damper in a pipe with a circular section in terms of noise generation. Also possible improvements are sought of the working characteristics of dampers by a substantial reduction of the aerodynamic noise. Finally a successful solution is presented based on the cascade expansion of air in a duct achieving a reduction of noise by approx. 6 dB." . "5-7325-0816-3" . . . "2"^^ . . "Nov\u00FD, Richard" . "RIV/68407700:21220/04:02100768!RIV/2005/MSM/212205/N" . "2"^^ . . . "Sni\u017Eov\u00E1n\u00ED hluku generovan\u00E9ho klapkami"@cs . . . "Reduction of Noise Generated by Damper" . "2004-07-05+02:00"^^ . . "Pr\u016Ftok vzduchu potrub\u00EDm je \u0159\u00EDzen p\u0159ev\u00E1\u017En\u011B \u0161krcen\u00EDm (krom\u011B \u0159\u00EDzen\u00ED v\u00FDkonu ventil\u00E1tor\u016F, kde pou\u017E\u00EDv\u00E1me regulaci zm\u011Bnou ot\u00E1\u010Dek). V\u0161echny \u0161krt\u00EDc\u00ED elementy jsou zdroji aerodynamick\u00E9ho hluku. Nejb\u011B\u017En\u011Bj\u0161\u00EDmi \u0161krtic\u00EDmi elementy ve vzduchotechnick\u00FDch syst\u00E9mech jsaou jednolist\u00E9 \u010Di v\u00EDcelist\u00E9 klapky. Hlavn\u00EDm t\u00E9matem tohoto refer\u00E1tu je anal\u00FDza pracovn\u00EDch charakteristik klapky v potrub\u00ED kruhov\u00E9ho pr\u016F\u0159ezu z hlediska generace hluku. Rovn\u011B\u017E hled\u00E1n\u00ED mo\u017Enost\u00ED zlep\u0161en\u00ED pracovn\u00EDch charakteristik klapek prost\u0159ednictv\u00EDm sn\u00ED\u017Een\u00ED aerodynamick\u00E9ho hluku. Na z\u00E1v\u011Br je prezentov\u00E1n v\u00FDsledek jednoho z \u00FAsp\u011B\u0161n\u00FDch \u0159e\u0161en\u00ED zalo\u017Een\u00E9 na kask\u00E1dov\u00E9 expanzi vzduchu v potrub\u00ED dosahuj\u00EDc\u00ED sn\u00ED\u017Een\u00ED hlu\u010Dnosti asi o 6 dB."@cs . "Ku\u010Dera, Miroslav" . . "The flow of air through ducts is mainly controlled by throttling (except for the control of the performance of fans, where variating speed is used). All throttling elements are sources of aerodynamic noise. The most common throttling elements in air conditioning systems are butterfly (single-blade) or multiblade dampers. The main object of the present paper is an analysis of the working characteristic of a butterfly damper in a pipe with a circular section in terms of noise generation. Also possible improvements are sought of the working characteristics of dampers by a substantial reduction of the aerodynamic noise. Finally a successful solution is presented based on the cascade expansion of air in a duct achieving a reduction of noise by approx. 6 dB."@en . "St.Petersburg" . . "St.Petersburg" . "Z(MSM 210000011)" . . "8"^^ . "21220" . "The Eleventh Internation Congress on Sound and Vibration" . . . "Reduction of Noise Generated by Damper"@en . "3097 ; 3104" . "Reduction of Noise Generated by Damper"@en . . "The International Institute of Acoustics and Vibration (IIAV)" .