초록

A method of making a composite panel having subsonic transverse wave speed characteristics which 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.

대표청구항 ▼

1. A method of making a structurally stiff composite panel characterized by having a subsonic transverse wave speed for reduced vibrational sound radiation, comprising the steps of: providing a lightweight core, a first sheet, and a second sheet;sandwiching said lightweight core between said first s

1. A method of making a structurally stiff composite panel characterized by having a subsonic transverse wave speed for reduced vibrational sound radiation, comprising the steps of: providing a lightweight core, a first sheet, and a second sheet;sandwiching said lightweight core between said first sheet and said second sheet;attaching at least one of said first sheet and said second sheet to said lightweight core at first regions thereof wherein second regions of said lightweight core remain unattached to said at least one of said first and second sheet to thereby form a composite panel such that subsonic transverse wave speed characteristics are exhibited by the composite panel at said second regions; andsaid step of attaching including the step of adjusting a total area of said first regions that defines a structural stiffness of the composite panel and a total area of said second regions that defines sound radiation efficiency and sound power transmission loss of the composite panel, wherein a desired balance is formed between the composite panel's structural stiffness and the composite panel's sound radiation efficiency and sound pressure transmission loss. 2. The method according to claim 1, further comprising the step of forming an empty recess in at least one of said lightweight core, said first sheet and said second sheet at each of said second regions, wherein the composite panel constructed without said empty recess would have a supersonic transverse wave speed. 3. The method according to claim 1, wherein said first sheet and said second sheet are the same material. 4. The method according to claim 1, wherein said first sheet and said second sheet are different materials. 5. The method according to claim 2, wherein said lightweight core is selected from the group consisting of a honeycomb core, a truss core, and a foam core. 6. The method according to claim 1, wherein transverse wave speed of said first sheet and said second sheet is subsonic. 7. The method according to 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. The method according to claim 1, wherein said second regions are identically sized and shaped. 9. The method according to claim 1, further comprising the step of completely attaching a face of one of said first sheet and said second sheet to said lightweight core. 10. The method according to claim 1, wherein at least one of said lightweight core, said first sheet and said second sheet is recess free. 11. The method according to claim 1, wherein each of said lightweight core, said first sheet and said second sheet are recess free. 12. The method according to claim 1, wherein said first sheet and said second sheet are a material selected from the group consisting of graphite epoxy, aluminum, and fiberglass. 13. A method of making a structurally stiff composite panel characterized by having a subsonic transverse wave speed for reduced vibrational sound radiation, comprising the steps of: providing a core, a first sheet, and a second sheet, wherein transverse wave speed of said first sheet and said second sheet is subsonic;sandwiching said core between said first sheet and said second sheet;selectively attaching said first sheet to said core at first regions thereof wherein second regions of said core remain unattached to said first sheet to thereby form a composite panel such that subsonic transverse wave speed characteristics are exhibited by the composite panel at said second regions;completely attaching a face of said second sheet to said core; andsaid step of selectively attaching including the step of adjusting a total area of said first regions that defines a structural stiffness of the composite panel and a total area of said second regions that defines sound radiation efficiency and sound power transmission loss of the composite panel wherein a desired balance is formed between the composite panel's structural stiffness and the composite panel's sound radiation efficiency and sound pressure transmission loss. 14. The method according to claim 13, further comprising the step of forming an empty recess in at least one of said core and said first sheet at each of said second regions. 15. The method according to claim 13, wherein said first sheet and said second sheet are the same material. 16. The method according to claim 13, wherein said first sheet and said second sheet are different materials. 17. The method according to claim 13, wherein said core is selected from the group consisting of a honeycomb core, a truss core, and a foam core. 18. The method according to claim 13, wherein said second regions are identically sized and shaped. 19. The method according to claim 13, wherein at least one of said core and said first sheet is recess free. 20. The method according to claim 13, wherein said first sheet and said second sheet are a material selected from the group consisting of graphite epoxy, aluminum, and fiberglass. 21. A method of making a structurally stiff composite panel having subsonic transverse wave speed characteristics for reduced vibrational sound radiation, comprising the steps of: providing a core, a first sheet, and a second sheet, wherein transverse wave speed of said first sheet and said second sheet is subsonic, wherein said core and said first sheet are recess free;sandwiching said core between said first sheet and said second sheet;selectively attaching said first sheet to said core at first regions thereof wherein second regions of said core remain unattached to said first sheet to thereby form a composite panel such that subsonic transverse wave speed characteristics are exhibited by the composite panel at said second regions;completely attaching a face of said second sheet to said core; andsaid step of selectively attaching including the step of adjusting a total area of said first regions that defines a structural stiffness of the composite panel and a total area of said second regions that defines sound radiation efficiency and sound power transmission loss of the composite panel wherein a desired balance is formed between the composite panel's structural stiffness and the composite panel's sound radiation efficiency and sound pressure transmission loss.