000			01295nam a22001697a 4500
003			OSt
005			20160617162416.0
008			160617b xxu||||| |||| 00| 0 eng d
040			_cNational Acoustic Laboratories
100			_aLeader, James
245			_aON THE COMPLETENESS AND ORTHOGONALITY OF THE ACOUSTIC MODES OF AN OPEN CAVITY
520	3		_aThe modal representation of closed acoustical systems such as rooms and enclosures is well known and is commonly used to find the forced response at a given frequency as the superposition of the modes. In open systems such as parallel noise barriers, open enclosures or reactive type duct mufflers, the modal representation may be incomplete due to radiation losses encompassed by the imaginary part of the eigensolution. This has been declared as an open problem in the literature, with sound field predictions being found accurate only at the resonant frequencies. In the present study, the completeness and orthogonality of the quasinormal modes is investigated using the example of a twodimensional open cavity system.
700			_aJie Pan
773			_tAcoustics 2015 Hunter Valley 15-18 November 2015
856			_uhttp://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/397/p71.pdf?sequence=1&isAllowed=y
942			_2udc _cARTICLE
999			_c2589 _d2589