Title:
高架構造物の消音方法および消音構造
Document Type and Number:
Japanese Patent JP6717595
Kind Code:
B2
Abstract:
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
Inventors:
Juichi Nagafune
Hiroshi Iwabuki
Yasuyuki Sano
Hiroshi Iwabuki
Yasuyuki Sano
Application Number:
JP2015248066A
Publication Date:
July 01, 2020
Filing Date:
December 18, 2015
Export Citation:
Assignee:
East Japan Expressway Co., Ltd.
West Japan Expressway Co., Ltd.
Expressway Research Institute Co., Ltd.
School corporation Nagoya Denki Gakuen
West Japan Expressway Co., Ltd.
Expressway Research Institute Co., Ltd.
School corporation Nagoya Denki Gakuen
International Classes:
E01F8/00; E01D1/00
Domestic Patent References:
| JP9003833A | ||||
| JP2001249665A | ||||
| JP52092011U | ||||
| JP2001220716A |
Foreign References:
| WO2012144078A1 |
Attorney, Agent or Firm:
Mitsuhiro Ozeki