Development of Analytical Impact Force Models for Floor Impact Vibration and Acoustic Numerical Analysis

Abstract

Apartment houses have been continuously constructed in Korea to solve overcrowding in large cities. The interlayer noise arising from these apartment houses has now become a critical social problem which requires an urgent solution. In recent years, studies applying numerical analysis techniques with respect to the structural type and floor plane have been carried out to effectively reduce the heavy weight impact noise, which is a cause for the interlayer noise. This study proposes analytical impact force models based on the actual measurement data regarding the heavy weight impact noise, which is mandatory input data for performing a numerical analysis. Additionally, the appropriateness of the proposed models has been verified through a comparative review with Korean standards. With the use of the proposed model, a numerical analysis has been conducted using a wall-type specimen, and a comparative analysis has been also performed with respect to the field measurement data. The applicability of the proposed model to the numerical analysis shows the possibility to resolve the interlayer noise problems numerically posing difficulties due to both the limited costs and time. Finally, it is expected that more information can be provided to resolve the interlayer noise problem based on the numerical analysis of various boundary conditions.

Vibro-Acoustic Numerical Simulation for Analyzing Floor Noise of a Multi-Unit Residential Structure

“…Accordingly, in order to analyze noise caused by floor impact sound, the speed of the air particle vibrations occurring due to vibration transfer is the boundary condition of the noise analysis. The precise vibration velocity of structures such as slabs or walls can be computed through the analysis of structural vibration, and the precise analysis of noise can be conducted based on the computed vibration velocity [3,13,14]. Generally, Equation (1) is applied to calculate the structural vibration of the test structure, which is caused by an external impact source (F).…”

“…The equation of motion shows the relationship between pressure and displacement, and the equation of continuity indicates the displacement-density relation. Equation (2) below is the acoustic wave equation [13,23].…”

“…A detailed explanation of the structural analysis and acoustic analysis for interested readers can be found in [3,14,[26][27][28][29][30]. 2below is the acoustic wave equation [13,23].…”

“…Recently, various studies using numerical analysis methods, such as the finite element method (FEM), the boundary element method (BEM), and the statistical energy analysis (SEA), on floor noise sources, transmission paths, and noise reduction are being performed to propose a fundamental solution [3][4][5][6][7][8][9][10][11][12][13][14][15]. The selection of the numerical method depends on the frequency domain of interest.…”

Nonlinear Vibration Response of a Rectangular Tube with a Flexible End and Non-Rigid Acoustic Boundaries

“…In these examples, the structures are usually made of thin metal panels and are easily excited to vibrate nonlinearly, and the boundaries of the cavities are Figure 2 shows the general concept of a structural-acoustic model, in which the structural part is in contact with a finite cavity by physical boundaries. The enclosed volume would induce the acoustic resonant behavior, which is normally modeled using the well-known wave equation [1,2,[15][16][17]. This wave equation has been used in numerous applied science/engineering problems for the past few decades.…”