For multiple-layered composite walls that are often used as the separating walls in apartment buildings, the assessment of their low-frequency resonance transmission is crucial in the evaluation of their sound insulation performances. The purpose of this paper is to simulate the laboratory measurement of airborne sound insulation performances for composite walls by applying the finite element method (FEM) and validate the simulated results at low frequencies. Sound transmission losses for two composite walls, composed of RC panels, steel studs, and gypsum boards, were measured and then simulated using FEM, where the detailed structures of the target walls and the configuration of the laboratory measurement were modeled. The simulated results showed general correspondence to the measured results in the 1/3-octave bands above 100 Hz. Furthermore, the reduction of transmission losses with the additional linings of the composite walls were calculated, and the results demonstrated the influence of the boundary conditions of the basic wall on the reduction due to the low-frequency resonance transmission.
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