Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2019
Date : August 27, 2019 - August 30, 2019
In architectural acoustics, accurate predictions of floor impact sound are important because the transmission of sound in buildings can have a great influence on well-being. We propose a new numerical method for accurately predicting floor impact sound and present several numerical examples. Typically, floor impact sound levels are predicted using finite element methods (FEMs) and the authors have previously developed a simplified method for predicting sound from the vibration response characteristics of structures. In general, beams and floor slabs are modeled in FEMs by using beam, plate and shell elements. However, solid elements should be used in a strict sense because they vibrate non-uniformly in the thickness direction. Unfortunately, this leads to high computational costs and possibly locking phenomena. One possible solution to this problem is to use higher-order elements. Spectral element methods (SEMs) offer the possibility of using elements of arbitrary order. The new method we propose is formulated as an SEM with high order solid elements. Part of a building, comprising some columns, beams and floor slabs, is analyzed using the new method and the vibration response characteristics is computed. The numerical results are in good agreement with measurements and the computational effort required is about half of that consumed by the conventional FEM using quadratic solid elements.
