A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
SOUND DEADENING METHOD AND SOUND DEADENING STRUCTURE FOR ELEVATED STRUCTURE
PROBLEM TO BE SOLVED: To provide a sound deadening technique for an elevated structure than can deaden a sound radiated from a lower surface of the elevated structure owing to vibration of a floor slab.SOLUTION: As a vehicle 4 etc., travels on an elevated structure 2, a floor slab 3 of the elevated structure 2 vibrates and a low-frequency sound +L in a band due to natural vibration of the floor slab 3 is radiated downward from a lower surface 20 of the elevated structure 2. At this time, part of the low-frequency sound +L radiated from the lower surface 20 of the elevated structure 2 is made to enter an internal space 10 of a helmholtz resonator 1 through a flat plane 14 of the helmholtz resonator 1 in contact with the lower surface 20 of the elevated structure 2. Then the phase is inverted at a sound output opening part 15 of the helmholtz resonator 1, and a low-frequency sound -L having the opposite phase is radiated downward from the sound output opening part 15 of the helmholtz resonator 1. Consequently, radiation efficiency of a sound wave radiated from the elevated structure 2 is reduced.SELECTED DRAWING: Figure 1
【課題】床版等の振動により高架構造物の下面から放射される低周波音を消音することが可能な高架構造物の消音技術を提供する。【解決手段】高架構造物２上を車両４等が走行すると、高架構造物２の床版３が振動して、床版３の固有振動に起因する帯域の低周波音＋Ｌが高架構造物２の下面２０から下方に向けて放射される。この際、高架構造物２の下面２０から放射される低周波音＋Ｌの一部が、高架構造物２の下面２０と接触するヘルムホルツレゾネータ１の平坦面１４を介してヘルムホルツレゾネータ１の内部空間１０へ入射される。そして、ヘルムホルツレゾネータ１の出音用開口部１５で位相が反転され、逆位相の低周波音−Ｌがヘルムホルツレゾネータ１の出音用開口部１５から下方へ向けて出射される。これにより、高架構造物２から放射される音波の放射効率を低減させる。【選択図】図１
SOUND DEADENING METHOD AND SOUND DEADENING STRUCTURE FOR ELEVATED STRUCTURE
PROBLEM TO BE SOLVED: To provide a sound deadening technique for an elevated structure than can deaden a sound radiated from a lower surface of the elevated structure owing to vibration of a floor slab.SOLUTION: As a vehicle 4 etc., travels on an elevated structure 2, a floor slab 3 of the elevated structure 2 vibrates and a low-frequency sound +L in a band due to natural vibration of the floor slab 3 is radiated downward from a lower surface 20 of the elevated structure 2. At this time, part of the low-frequency sound +L radiated from the lower surface 20 of the elevated structure 2 is made to enter an internal space 10 of a helmholtz resonator 1 through a flat plane 14 of the helmholtz resonator 1 in contact with the lower surface 20 of the elevated structure 2. Then the phase is inverted at a sound output opening part 15 of the helmholtz resonator 1, and a low-frequency sound -L having the opposite phase is radiated downward from the sound output opening part 15 of the helmholtz resonator 1. Consequently, radiation efficiency of a sound wave radiated from the elevated structure 2 is reduced.SELECTED DRAWING: Figure 1
【課題】床版等の振動により高架構造物の下面から放射される低周波音を消音することが可能な高架構造物の消音技術を提供する。【解決手段】高架構造物２上を車両４等が走行すると、高架構造物２の床版３が振動して、床版３の固有振動に起因する帯域の低周波音＋Ｌが高架構造物２の下面２０から下方に向けて放射される。この際、高架構造物２の下面２０から放射される低周波音＋Ｌの一部が、高架構造物２の下面２０と接触するヘルムホルツレゾネータ１の平坦面１４を介してヘルムホルツレゾネータ１の内部空間１０へ入射される。そして、ヘルムホルツレゾネータ１の出音用開口部１５で位相が反転され、逆位相の低周波音−Ｌがヘルムホルツレゾネータ１の出音用開口部１５から下方へ向けて出射される。これにより、高架構造物２から放射される音波の放射効率を低減させる。【選択図】図１
SOUND DEADENING METHOD AND SOUND DEADENING STRUCTURE FOR ELEVATED STRUCTURE
高架構造物の消音方法および消音構造
OSAFUNE TOSHIKAZU (author) / IWABUKI HIROSHI (author) / SANO YASUYUKI (author)
2017-06-22
Patent
Electronic Resource
Japanese
IPC:
E01F
ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
,
Zusätzliche Baumaßnahmen, wie die Ausstattung von Straßen oder die bauliche Ausbildung von Bahnsteigen, Landeplätzen für Hubschrauber, Wegweisern, Schneezäunen oder dgl.
/
E01D
BRIDGES
,
Brücken