Application of finite element method for estimation of acoustic parametersApplication of finite element method for estimation of acoustic parametersΧρήση της μεθόδου των πεπερασμένων στοιχείων για τον υπολογισμό ακουστικών μεγεθών Διδακτορική Διατριβή Doctoral Dissertation 2018-04-162017enIn the field of computational acoustics, the calculation of the impulse response of a space is of vital importance. Acoustic parameters, frequency response and the cumulative spectral decay can directly be extracted from the impulse response. This thesis contributes on the development and utilization of a Finite Element Method in the Time Domain for estimating the impulse response and acoustic parameters of a room. A methodology is developed for resolving the most crucial elements involving the Finite Element Method in the Time Domain. In order to develop an accurate method, we considered different modeling parameters (source selection, modeling of walls and acoustic material) and different parameters for the numerical scheme (finite element meshes, time stepping method, time stepping scales). For this purpose the impulse responses and the acoustic parameters of a reverberant space were computed and then compared with the measured ones. The results showed that the Time Domain Finite Element Method is an applicable method that provides good results for the calculation of the impulse response and acoustic parameters in a reverberant room. As a utilization of the Time Domain Finite Element Method the method was applied in a Virtual Reverberation Chamber for the calculation of the absorption coefficients of an acoustic panel. The results showed that the method can be used for the prediction of the absorption characteristics of acoustic panels of various shapes prior to their manufacture.http://creativecommons.org/licenses/by-nc-nd/4.0/Πολυτεχνείο Κρήτης::Σχολή Μηχανικών Παραγωγής και ΔιοίκησηςPapadakis_Nikolaos_PhD_2017.pdfChania [Greece]Library of TUC2018-04-16application/pdf8.3 MBfree Papadakis Nikolaos Παπαδακης Νικολαος Stavroulakis Georgios Σταυρουλακης Γεωργιος Manousaki Dafni Μανουσακη Δαφνη Provatidis, Christopher Antoniadis Aristomenis Αντωνιαδης Αριστομενης Sotiropoulos Dimitris Σωτηροπουλος Δημητρης Ouggrinis Konstantinos-Alketas Ουγγρινης Κωνσταντινος-Αλκετας Providakis Konstantinos Προβιδακης Κωνσταντινος Πολυτεχνείο Κρήτης Technical University of Crete Μέθοδος πεπερασμένων στοιχείων Finite element method Υπολογιστική ακουστική Computational acoustics Αρχιτεκτονική ακουστική Architectural acoustics