Analysis of the Influence of Interfloor Noise Reduction Factors Using a Box-Type Test Room Model

Purpose: This study aims to evaluate heavyweight floor impact noise through a numerical simulation using the finite element method (FEM) within a box-type test chamber. It focuses on analyzing the acoustic response and identifying the influence of structural factors, such as slab thickness and material density, on sound pressure reduction in the low-frequency domain. Method: A three-dimensional structural–acoustic coupling model was developed using COMSOL Multiphysics. An impact force, defined by the KS F 2810-2:2022 standard rubber ball specifications, was applied at the center of the floor slab. Frequency response functions (FRF) and sound pressure levels were measured at both center and corner positions. Additionally, a parametric study was conducted by varying slab thickness (150~210mm) and material density (2070~2300kg/m³ ). Result: The simulation identified major resonance modes at 57Hz, 83Hz, and 114Hz, with a sharp increase in modal density above 100Hz. A one-third octave band analysis showed a frequency shift in dominant energy from 63Hz to 125Hz compared to real-world trends. The parametric analysis confirmed that increased slab thickness and density led to notable reductions in sound pressure levels, particularly at 63Hz. These results demonstrate the utility of FEM simulations as a reliable tool for assessing impact sound transmission and guiding future improvements for residential noise control.