Composite panel having subsonic transverse wave speed characteristics

Abstract

A composite panel has first and second sheets sandwiching a core with at least one of the sheets being attached to the core at first regions thereof and unattached to the core at second regions thereof.

1 . A composite panel comprising first and second sheets sandwiching a core with at least one of said first and second sheets attached to said core at first regions thereof and unattached to said core at second regions thereof.  
   
   
       2 . A composite panel as in  claim 1  wherein each of said second regions is a recess formed in at least one of said core, said first sheet and said second sheet.  
   
   
       3 . A composite panel as in  claim 1  wherein said first and second sheets are the same material.  
   
   
       4 . A composite panel as in  claim 1  wherein said first and second sheets are different materials.  
   
   
       5 . A composite panel as in  claim 1  wherein said core is selected from the group consisting of a honeycomb core, a truss core and a foam core.  
   
   
       6 . A composite panel as in  claim 1  wherein transverse wave speed of each of said first and second sheets is subsonic.  
   
   
       7 . A composite panel as in  claim 1  wherein said second regions adjacent to said first sheet are mirror imaged with respect to said second regions adjacent to said second sheet.  
   
   
       8 . A composite panel as in  claim 1  wherein said second regions are identically sized and shaped.  
   
   
       9 . A composite panel as in  claim 2  further comprising acoustically absorbent material in said recess.  
   
   
       10 . A composite panel comprising first and second sheets adjacent to and sandwiching a core therebetween with at least one of said first and second sheets attached to said core at first regions thereof and unattached to said core at second regions thereof such that said composite panel is characterized as having a subsonic transverse wave speed at portions thereof bounded by said second regions.  
   
   
       11 . A composite panel as in  claim 10  wherein each of said second regions is a recess formed in at least one of said core, said first sheet and said second sheet.  
   
   
       12 . A composite panel as in  claim 10  wherein said first and second sheets are the same material.  
   
   
       13 . A composite panel as in  claim 10  wherein said first and second sheets are different materials.  
   
   
       14 . A composite panel as in  claim 10  wherein said core is selected from the group consisting of a honeycomb core, a truss core and a foam core.  
   
   
       15 . A composite panel as in  claim 10  wherein transverse wave speed of each of said first and second sheets is subsonic.  
   
   
       16 . A composite panel as in  claim 10  wherein said second regions adjacent to said first sheet are mirror imaged with respect to said second regions adjacent to said second sheet.  
   
   
       17 . A composite panel as in  claim 10  wherein said second regions are identically sized and shaped.  
   
   
       18 . A composite panel as in  claim 11  further comprising acoustically absorbent material in said recess.  
   
   
       19 . A composite panel as in  claim 10  wherein a face of said first sheet is completely attached to said core.  
   
   
       20 . A composite panel as in  claim 19  wherein each of said second regions is a recess formed in at least one of said core and said second sheet.  
   
   
       21 . A composite panel as in  claim 19  wherein said core is selected from the group consisting of a honeycomb core, a truss core and a foam core.  
   
   
       22 . A composite panel as in  claim 19  wherein said second regions are identically sized and shaped.