| Zugriffsnummer | 30734 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Analytical and numerical investigation of the sound power emission of a vibrating baffled piston into a hemi-anechoic room |
| Autor(in); Institution |
Völkel, Katharina; 1.7, Akustik und Dynamik, PTB-Braunschweig
Schmelzer, Martin; 1.7, Akustik und Dynamik, PTB-Braunschweig
Wittstock, Volker; 1.7, Akustik und Dynamik, PTB-Braunschweig
|
| Quelle/Jahr | Fortschritte der Akustik - DAGA 2014 : proceedings:(2014), 794 - 795 |
| Availability | [CD-ROM] ; file name: 000352.pdf |
| Herausgeber(in) |
Kollmeier, Birger
|
| ISBN | 978-3-939296-06-5 |
| Verlag | Berlin: DEGA |
| Konferenzangaben | 40. Deutsche Jahrestagung für Akustik, Oldenburg, 10-13, März, 2014, Deutschland |
| Zusammenfassung | In this study a shaker driven rigid circular piston was analyzed. Sound emission into a hemi-anechoic room as well as characteristics of the sound field were investigated. Analytical and numerical approaches were used. The sound emission of the analytical model was calculated with both a lumped parameter model and the use of Rayleigh’s integral with predefined velocity distributions on the source surface. An investigation of the first eigenmodes was carried out as well. The characteristics of the sound field studied were the near-field effect, defined as phase shift between sound velocity and pressure on different enveloping surfaces, the directivity factor and sound power concentration. Free field conditions were used as underlying assumption. The numerical analyses with the same main focus were carried out using finite elements software. In doing so, variations of input parameters were modeled also. Main focus of attention in this contribution will be placed upon the findings from the numerical studies and along with an overview of the analytical calculations, differences and similarities between both approaches will be highlighted. This study is part of the PTB coordinated EMRP project SIB56 sound power, whose goal is the realization of the unit watt through a primary standard. In hitherto existing experiments the rigid circular piston was used as a primary standard. |
