Patent ID: 11931199
Assignee: nan
Field: Other consumer goods (Other fields)
Classification: CPC A  G | IPC A  B  F  G

Claim 6:
7. A brokenly-cascaded sound-silencer [3.B40] comprising a broken pipe formed by an in-line arranged brokenly-cascaded array of a multiplicity of the sound-silencer of claim 6;
the brokenly-cascaded sound-silencer has:
a broken corpus, broken by at least one open space, and
the sound-silencers, indicated by index n enumerated from 1 to N, wherein N is defined as at least 2;

wherein each n-th sound-silencer comprises:
an open sound-inlet having a sound-inlet cross-sectional area of AIN,n;
an open sound-outlet having a sound-outlet cross-sectional area of AOU,n; and
a varying cross-sectional area, varying along the canal length thereby forming a shaped pipe being convergent-divergent and characterized by a cross-sectional area profile function An(x);

wherein:
a cross-sectional area profile broken function of the brokenly-cascaded sound-silencer as a whole is a piecewise-broken-with-intervals piecewise-convergent-divergent cross-sectional area profile function ABROKEN(x) comprising portions An(x), n=1, 2, . . . , N, associated with the n-th sound-silencer, correspondingly, wherein the n-th cross-sectional area profile function An(x) is expressed as:, A
       n
      
      (
      x
      )
     
     =
     
      
       
        A
        
         *
         n
        
       
       
        
         M
         n
        
        (
        x
        )
       
      
      ⁢
      
       
        (
        
         
          γ
          -
          1
         
         γ
        
        )
       
       
        1
        2
       
      
      ⁢
      
       
        (
        
         
          2
          +
          
           
            γ
            ⁡
            (
            
             
              M
              n
             
             (
             x
             )
            
            )
           
           2
          
         
         
          γ
          +
          1
         
        
        )
       
       
        
         γ
         +
         1
        
        
         2
         ⁢
         
          (
          
           γ
           -
           1
          
          )
         
        
       
      
     
    
    ,
    

    
     
      x
      
       a
       ,
       n
      
     
     <
     x
     <
     
      x
      
       b
       ,
       n
      
     
    
   
     
  
  ⁢
  

  
    
   
    
     n
     =
     1
    
    ,
    2
    ,
    …
       
    ,
    N
   
  
 

where xa,n and xb,n are x-coordinates of the open sound-inlet and open sound-outlet, correspondingly, of the n-th sound-silencer, and Mn(x) is an n-th monotonically-decreasing gradually-smooth function of x representing an M-velocity profile of the fluid tiny portion moving within and through the n-th sound-silencer; and
the N sound-silencers are arranged sequentially one after another with intervals of open space such that a portion of the propagating sound sequentially:
enters the open sound-inlet of each n-th sound-silencer,
propagates within the n-th sound-silencer,
reaches the open sound-outlet of the n-th sound-silencer,
becomes launched from the open sound-outlet of the n-th sound-silencer,
while n<N, enters the interval of open space between the n-th and (n+1)-th sound-silencer, and
when n=N, becomes a resulting acoustic beam launched from the open sound-outlet of the N-th sound-silencer and characterized by a decreased intensity manifested as suppressed sound loudness.