A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
SOUND PROOF DEVICE
PROBLEM TO BE SOLVED: To provide a sound proof device that can reduce noise in which directivity changes.SOLUTION: When noise Wpasses through a piercing 8a of a noise reduction part 8, the noise Wbecomes a plane wave to advance toward a sound absorption part 9. As a result, even when directivity of the noise Wwith respect to a sound proof device 7 varies with along with a movement of a sound source S, the noise Wadvances to the sound proof device 7 with an almost fixed directivity orthogonal to the piercing 8a of the noise reduction part 8. When the noise Wpasses through the noise reduction part 8, viscosity resistance when the noise Wpasses through the piercing 8a attenuates energy of the noise W, and then, the noise Wreduces. When the noise Wpassing through the noise reduction part 8 advances toward the sound absorption part 9, the noise Wis absorbed by the sound absorption part 9. When the noise Wpassing through the noise reduction part 8 enter a closed space C, a noise reduction part 10 is configured to generate a sound wave Wof an inverse phase in the same amplitude as the noise Win the closed space C, and the sound wave Wand noise Ware overlapped in the closed space C so as to cancel out the th noise W, which in turn the noise Wreduces.SELECTED DRAWING: Figure 2
【課題】指向性が変化する騒音を低減することができる防音装置を提供する。【解決手段】騒音低減部８の穿孔８ａを騒音Ｗ1が通過すると、騒音Ｗ1が平面波となって吸音部９に向かって進む。その結果、音源Ｓの移動とともに防音装置７に対する騒音Ｗ1の指向性が刻々と変化しても、騒音低減部８の穿孔８ａに対して直交する略一定の指向性で騒音Ｗ1が防音装置７に進む。騒音低減部８に騒音Ｗ1が通過するとこの騒音Ｗ1が穿孔８ａを通過するときの粘性抵抗によって騒音Ｗ1のエネルギーが減衰し騒音Ｗ1が低減する。騒音低減部８を通過する騒音Ｗ1が吸音部９に向かって進入すると、この騒音Ｗ1が吸音部９によって吸収される。騒音低減部８を通過する騒音Ｗ1が閉空間Ｃに進入すると、騒音Ｗ1と同振幅で逆位相の音波Ｗ2を騒音低減部１０が閉空間Ｃに発生し、騒音Ｗ1を打ち消すように音波Ｗ2と騒音Ｗ1とが閉空間Ｃで重ね合わされて騒音Ｗ1が低減する。【選択図】図２
SOUND PROOF DEVICE
PROBLEM TO BE SOLVED: To provide a sound proof device that can reduce noise in which directivity changes.SOLUTION: When noise Wpasses through a piercing 8a of a noise reduction part 8, the noise Wbecomes a plane wave to advance toward a sound absorption part 9. As a result, even when directivity of the noise Wwith respect to a sound proof device 7 varies with along with a movement of a sound source S, the noise Wadvances to the sound proof device 7 with an almost fixed directivity orthogonal to the piercing 8a of the noise reduction part 8. When the noise Wpasses through the noise reduction part 8, viscosity resistance when the noise Wpasses through the piercing 8a attenuates energy of the noise W, and then, the noise Wreduces. When the noise Wpassing through the noise reduction part 8 advances toward the sound absorption part 9, the noise Wis absorbed by the sound absorption part 9. When the noise Wpassing through the noise reduction part 8 enter a closed space C, a noise reduction part 10 is configured to generate a sound wave Wof an inverse phase in the same amplitude as the noise Win the closed space C, and the sound wave Wand noise Ware overlapped in the closed space C so as to cancel out the th noise W, which in turn the noise Wreduces.SELECTED DRAWING: Figure 2
【課題】指向性が変化する騒音を低減することができる防音装置を提供する。【解決手段】騒音低減部８の穿孔８ａを騒音Ｗ1が通過すると、騒音Ｗ1が平面波となって吸音部９に向かって進む。その結果、音源Ｓの移動とともに防音装置７に対する騒音Ｗ1の指向性が刻々と変化しても、騒音低減部８の穿孔８ａに対して直交する略一定の指向性で騒音Ｗ1が防音装置７に進む。騒音低減部８に騒音Ｗ1が通過するとこの騒音Ｗ1が穿孔８ａを通過するときの粘性抵抗によって騒音Ｗ1のエネルギーが減衰し騒音Ｗ1が低減する。騒音低減部８を通過する騒音Ｗ1が吸音部９に向かって進入すると、この騒音Ｗ1が吸音部９によって吸収される。騒音低減部８を通過する騒音Ｗ1が閉空間Ｃに進入すると、騒音Ｗ1と同振幅で逆位相の音波Ｗ2を騒音低減部１０が閉空間Ｃに発生し、騒音Ｗ1を打ち消すように音波Ｗ2と騒音Ｗ1とが閉空間Ｃで重ね合わされて騒音Ｗ1が低減する。【選択図】図２
SOUND PROOF DEVICE
防音装置
HANSAKA YUKINORI (author) / SATO DAIGO (author) / MAMADA SHOGO (author)
2017-01-12
Patent
Electronic Resource
Japanese
IPC:
G10K
Tonerzeugungsvorrichtungen
,
SOUND-PRODUCING DEVICES
/
E01B
PERMANENT WAY
,
Gleisoberbau
/
E01F
ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
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Zusätzliche Baumaßnahmen, wie die Ausstattung von Straßen oder die bauliche Ausbildung von Bahnsteigen, Landeplätzen für Hubschrauber, Wegweisern, Schneezäunen oder dgl.