| Project/Area Number |
26630260
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Architectural environment/Equipment
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
TAKEOKA Shigeto 静岡理工科大学, 理工学部, 講師 (30514468)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 計測法 / 音響材料 / パラメトリックスピーカ / 非線形現象 / 音波散乱特性 / 吸音特性 / 反射特性 |
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| Outline of Final Research Achievements |
Edge diffraction seriously affects measurement results of sound reflection and absorption, and as a result, accuracy of the measurement is often deteriorated in an acoustical measurement assuming a free sound field. Such an edge diffraction can be avoid by using a parametric loudspeaker, which has acute directivity characteristics, because the incident sound is concentrated to a center area of the measurement specimen and the sound being incident on the edge area is restrained. In this study, at first, a parametric loudspeaker being used for architectural acoustic measurement was produced experimentally. After investigation on fundamental characteristics of the produced sound source, applicability of the parametric loudspeaker to reflection characteristics of diffusive walls was experimentally confirmed.
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