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Tuesday, July 9 • 10:50 - 11:10
HIGH-ACCURACY PREDICTION OF FLOOR IMPACT SOUND USING A SPECTRAL ELEMENT METHOD

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We propose a numerical method to predict accurately floor impact sound and show several numerical examples. In architectural acoustics, precise prediction of floor impact sound is an important issue because they are closely related to and influence our lives. To predict the sound, finite element methods (FEMs) are often used. We have also developed a simplified method to predict the sound from vibration response characteristics of structures obtained by FEMs previously. In general, structures such as columns, beams and floor slabs are modeled by using beam, plate and shell elements. The structures should be modeled with solid elements in a precise sense because they vibrate non-uniformly in their thickness directions. However, solid ones are seldom used due to their high computational costs or locking phenomena. One solution for the problems is use of high order elements and spectral element methods (SEMs) can easily offer arbitrary order elements over third ones. We formulated an SEM with high order solid elements and applied it to structure vibration analyses. A part of a building composed of some columns, beams and floor slabs was modeled with high order solid elements and its vibration response characteristics was computed. The numerical result showed good agreement with a measured one. In addition, the SEM could analyze it with about half the amount of required memory of a conventional FEM using second order solid elements. The SEM would make our simplified method to predict floor impact sound, which was developed in our previous work, more accurate and efficient than the conventional method using FEMs. In future work, we would further improve prediction accuracy of floor impact sound by analyzing not only vibration but also vibro-acoustic problems.

Moderators
avatar for Naval Agarwal

Naval Agarwal

Technical Fellow, The Boeing Company
avatar for Roderick Mackenzie

Roderick Mackenzie

Senior Acoustical Consultant, Soft dB Inc.

Authors

Tuesday July 9, 2019 10:50 - 11:10 EDT
St-Laurent 4
  T11 Room & build. acoustics, SS04 Struct-borne & impact noise in bld