ANALYTICAL SOLUTION OF ACOUSTIC CAVITY RIGID COUPLED TO A FLEXIBLE PLATE IN FREE VIBRATIONS
Jaime Rolando Rojas Huacanca1; Marcus Vinicius Girão de Morais2; Álvaro Campos Ferreira2; Noé Geraldo Rocha de Melo Filho2
1 Universidade de Brasília (UnB)- Integridade de Materiais da Engenharia, Brasília - DF; 2 Universidade de Brasília - Departamento de Engenharia Mecânica, Brasília - DF
doi:10.20906/CPS/CILAMCE2015-0205
Resumo
The passenger compartment of an automotive vehicle can be seen in the roughly as its flexible structure coupled acoustic cavity. The vibration transmitted by the structure due to the engine or trepidation of the track, generates acoustical disturbances inside the cavity responsible for audible discomfort of passengers. This problem of vibroacoustic, relatively complex, their study can be simplified to simpler geometries in order to apply more easily techniques of analytical, numerical and experimental analysis. This work presents the analytical solution of natural frequencies and modal shapes for rigid rectangular acoustic cavity coupled to flexible plate using the method of separation of variables. The analytical solution is compared with numerical results and experimental tests.
Palavras-chave: modal analysis; acoustic cavity; slender plates; vibroacoustic; Galerkin method