Macroscopic boundary modeling of acoustic environment for wave-based computational simulations

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360238
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Architectural environment/equipment
• Research Institution: Oita University
• Principal Investigator: OTSURU Toru 大分大学, 工学部, 教授 (30152193)
• Co-Investigator(Kenkyū-buntansha): TOMIKU Reiji 大分大学, 工学部, 准教授 (20420648)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 建築音響 / 建築環境 / 波動音響解析 / シミュレーション / 有限要素法 / モデリング / 吸音測定

Outline of Final Research Achievements

A new 27-node finite element constructed with the modified integration rule is proposed for computational simulations of room acoustics.and excellent accuracy is proved. To evaluate the finesse of the spacial mesh division, we proposed an index lg and a suit of the finite element simulations constructed using lG proved that the resulting room acoustics parameters show clear linearity to lG if the value is less than 0.8. Subjective experiments of the simulated acoustics proved that the boundary settings with the lG less than 1.2 cause smaller difference than just noticeable difference. A new measurement method using ensemble averaging is proposed for measuring the boundary’s absorption. A series of measurement using the method proved the uncertainties of the method stay the level with the standard deviations less than 0.04. A simple method to measure the boundary’s geometry using a camera with fish eye lens is given. A trial measurements are conducted with a calibration technique.

Free Research Field

建築環境・設備