Method and apparatus for reducing structural vibration and noise
First Claim
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1. A conjugate damper for a structural panel, said conjugate damper comprising:
- a constraining sheet extending in a first direction between a first edge and an opposite second edge, and extending in a second direction transverse to the first direction between a third edge and an opposite fourth edge, wherein at least a portion of each of said first edge and said second edge is directly coupled to a first surface of the structural panel, and said third and fourth edges are not directly coupled to the first surface; and
a damping layer coupled between said constraining sheet and the first surface such that when the structural panel is in a compressively deformed state, a thickness of said damping layer in a direction generally normal to the first surface is decreased relative to a baseline state, wherein a second distance between said first edge and said second edge increases when the structural panel is in the compressively deformed state, said damping layer comprises a viscoelastic material.
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Abstract
A conjugate damper for a structural panel includes a constraining sheet extending between a first edge and a second edge. Each of the first edge and the second edge is at least partially coupled to a first surface of the structural panel. The conjugate damper also includes a damping layer coupled between the constraining sheet and the first surface such that, when the structural panel is in a compressively deformed state, a thickness of the damping layer in a direction generally normal to the first surface is decreased relative to a baseline state. The damping layer includes a viscoelastic material.
83 Citations
17 Claims
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1. A conjugate damper for a structural panel, said conjugate damper comprising:
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a constraining sheet extending in a first direction between a first edge and an opposite second edge, and extending in a second direction transverse to the first direction between a third edge and an opposite fourth edge, wherein at least a portion of each of said first edge and said second edge is directly coupled to a first surface of the structural panel, and said third and fourth edges are not directly coupled to the first surface; and a damping layer coupled between said constraining sheet and the first surface such that when the structural panel is in a compressively deformed state, a thickness of said damping layer in a direction generally normal to the first surface is decreased relative to a baseline state, wherein a second distance between said first edge and said second edge increases when the structural panel is in the compressively deformed state, said damping layer comprises a viscoelastic material. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A structural panel for an aircraft, said structural panel comprising:
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a first surface; and at least one conjugate damper coupled to said first surface, said at least one conjugate damper comprising; a constraining sheet extending in a first direction between a first edge and an opposite second edge, and extending in a second direction transverse to the first direction between a third edge and an opposite fourth edge, wherein at least a portion of each of said first edge and said second edge is directly coupled to said first surface, and said third and fourth edges are not directly coupled to said first surface; and a damping layer coupled between said constraining sheet and said first surface such that when said structural panel is in a compressively deformed state, a thickness of said damping layer in a direction generally normal to said first surface is decreased relative to a baseline state, wherein a second distance between said first edge and said second edge increases when said structural panel is in the compressively deformed state, said damping layer comprises a viscoelastic material. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of reducing structural vibration and noise transmission in a structural panel, said method comprising:
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coupling at least a portion of a first edge of a constraining sheet directly to a first surface of the structural panel; coupling at least a portion of a second edge of the constraining sheet directly to the first surface, wherein the constraining sheet extends in a first direction between the first edge and the second edge, and extends in a second direction between a third edge and an opposite fourth edge, and wherein the third and fourth edges are not directly coupled to the first surface; providing a damping layer with a viscoelastic material; and coupling the damping layer between the constraining sheet and the first surface such that when the structural panel is in a compressively deformed state, a thickness of the damping layer in a direction generally normal to the first surface is decreased relative to a baseline state, wherein a second distance between the first edge and the second edge increases when the structural panel is in the compressively deformed state. - View Dependent Claims (14, 15, 16, 17)
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Specification