Development and experimental validation of a baffled BEM model for transmission loss prediction of fuselage panel

摘要

A quiet aircraft cabin is an important requirement for crew and passengers. In designing insulation systems for a cabin, a trade-off exists between cabin sound level, insulation cost and weight. Designing a fuselage for low noise in the early stages of design and optimizing the location of structural treatments (constrained layer damping) can reduce aircraft weight as well as insulation package cost. In this paper, baffled boundary element analysis (BEA) is used to predict transmission loss (TL) of a curved ribbed panel structure up to 1000 Hz. The panel was cut from one of Bombardier’s fuselages. A finite element (FE) structural model of the fuselage panel was developed. Frequency response functions (FRF) of the panel were measured at Bombardier’s Acoustic Lab. The measured data was used to validate the FE model of the structure. The validated FE model was coupled to an acoustical BE mesh to predict the transmission loss of the fuselage panel. A correlation was performed between the developed vibro-acoustic model and the measured transmission loss of the fuselage panel (the test was performed at the University of Sherbrooke TL facility). Numerical results as well as experimental measurements are presented.