Sound-absorbing structure and sound-absorbing unit

Abstract

Sound-absorbing unit is provided with a high sound-absorbing/insulating capability. The sound-absorbing unit ( 60 ) includes a corrugated partition plate ( 52 ) whose antinode portions ( 52 a , 52 b ) extend in a first direction (Y); a sound-absorbing material ( 51 ) provided on the corrugated partition plate ( 52 ); and a second partition plate ( 53 ) which extends in a second direction (X) and which partitions air portions ( 70 ) defined between the corrugated partition plate ( 52 ) and the sound-absorbing material ( 51 ).

1 . A sound-absorbing structure, comprising: 
 a substantially flat support base;    a substantially flat sound-absorbing material arranged substantially parallel to the support base; and    a corrugated partition plate interposed between the support base and the sound-absorbing material, the corrugated partition plate having upper antinode portions opposed to the sound-absorbing material and lower antinode portions opposed to the support base;    wherein the lower antinode portions of the corrugated partition plate are at least partially separated from the support base.    
   
   
       2 . The sound-absorbing structure as claimed in  claim 1 , wherein parts of the lower antinode portions of the corrugated partition plate are supported via an elastic element by low-vibration portions of the support base.  
   
   
       3 . A sound-absorbing unit comprising: 
 a corrugated partition plate having a first side and a second side opposite to the first side;    a substantially flat sound-absorbing material provided on the first side of the corrugated partition plate; and    at least one second partition plate configured to partition air spaces defined between the sound-absorbing material and the corrugated partition plate.    
   
   
       4 . The sound-absorbing unit as claimed in  claim 3 , wherein the second partition plate extends in a direction substantially perpendicular to a direction in which antinode portions of the corrugated partition plate extend.  
   
   
       5 . The sound-absorbing unit as claimed in  claim 3 , further comprising a second sound-absorbing material provided on the second side of the corrugated partition plate.  
   
   
       6 . The sound-absorbing unit as claimed in  claim 3 , wherein the second partition plate is provided only on the first side of the corrugated partition plate.  
   
   
       7 . The sound-absorbing unit as claimed in  claim 3 , wherein the corrugated partition plate includes a wave pattern whose phase is shifted at an intersection of the corrugated partition plate and the second partition plate.  
   
   
       8 . The sound-absorbing unit as claimed in  claim 3 , wherein the corrugated partition plate includes a wave pattern whose amplitude is varied at an intersection of the corrugated partition plate and the second partition plate.  
   
   
       9 . The sound-absorbing unit as claimed in  claim 3 , wherein the corrugated partition plate includes a sine wave pattern.  
   
   
       10 . The sound-absorbing unit as claimed in  claim 3 , wherein the corrugated partition plate includes a rectangular wave pattern.  
   
   
       11 . The sound-absorbing unit as claimed in  claim 3 , wherein the corrugated partition plate includes wave patterns with different frequencies.  
   
   
       12 . The sound-absorbing unit as claimed in  claim 3 , wherein the corrugated partition plate includes wave patterns with different amplitudes.  
   
   
       13 . A sound-absorbing unit comprising: 
 a partition plate having a plurality of recesses formed in a first side thereof, each of said recesses having an opening with a predetermined shape on the first side; and    a sound-absorbing material provided on the first side of the partition plate to cover the openings of the recesses,    wherein each of the recesses has a cross-sectional area that gradually varies with a depth of the recess.    
   
   
       14 . (canceled)  
   
   
       15 . The sound-absorbing unit as claimed in  claim 3 , wherein the thickness of air spaces behind the sound-absorbing material is set to odd multiples of one-fourth of the wavelength of sound waves of target frequencies.