Macroscopic boundary modeling of acoustic environment for wave-based computational simulations
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
|
Project Status |
Completed (Fiscal Year 2014)
|
Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2013: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2012: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
|
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 / 波動音響数値解析 / 境界モデリング / 吸音モデリング / 表面インピーダンス / 吸音率 / 建築環境工学 / 写真測定 / 建築環境・設備 |
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.
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Report
(4 results)
Research Products
(65 results)
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[Book] Springer Japan2014
Author(s)
Sakuma, Tetsuya, Shinichi Sakamoto, Toru Otsuru
Total Pages
324
Publisher
Computational Simulation in Architectural and Environmental Acoustics
Related Report