Methods and apparatus for reducing noise in reinforced skin structures
First Claim
1. A method for damping vibrational energy induced to a reinforced skin structure, wherein the reinforced skin structure includes an outer wall and at least one stringer coupled to the outer wall and having a length that extends between a pair of adjacent frame members, said method comprising:
- attaching a damping apparatus to the at least one stringer, the damping apparatus configured to dampen vibration of the at least one stringer, wherein the damping apparatus includes a stiffening member configured to adjust at least one of a bending mode and a torsional twisting mode of the stringer and an energy dissipation member configured to dissipate vibrational energy of the stringer, the stiffening member including at least two elongated members that are spaced a distance apart, and that are oriented substantially parallel to one another, wherein the stiffening member further includes at least one truss member that extends obliquely between the at least two elongated members; and
orienting the damping apparatus such that the at least two elongated members extend the length of the at least one stringer and such that the torsional twisting mode of the at least one stringer is adjusted.
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Abstract
Assemblies, methods, and an apparatus for damping vibrational energy induced to a reinforced skin structure are disclosed. The reinforced skin structure includes an outer wall and at least one stringer coupled to the outer wall. The method includes providing a damping apparatus that includes a stiffening member configured to adjust at least one of a bending mode and a torsional twisting mode of the stringer and an energy dissipation member configured to dissipate vibrational energy of the stringer. The stiffening member includes at least two elongated members that are spaced a distance apart and at least one truss member that extends obliquely between the at least two elongated members. The damping apparatus is attached to the at least one stringer. The damping apparatus may be configured to dampen vibration in the range of between about 200-600 Hz.
29 Citations
20 Claims
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1. A method for damping vibrational energy induced to a reinforced skin structure, wherein the reinforced skin structure includes an outer wall and at least one stringer coupled to the outer wall and having a length that extends between a pair of adjacent frame members, said method comprising:
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attaching a damping apparatus to the at least one stringer, the damping apparatus configured to dampen vibration of the at least one stringer, wherein the damping apparatus includes a stiffening member configured to adjust at least one of a bending mode and a torsional twisting mode of the stringer and an energy dissipation member configured to dissipate vibrational energy of the stringer, the stiffening member including at least two elongated members that are spaced a distance apart, and that are oriented substantially parallel to one another, wherein the stiffening member further includes at least one truss member that extends obliquely between the at least two elongated members; and orienting the damping apparatus such that the at least two elongated members extend the length of the at least one stringer and such that the torsional twisting mode of the at least one stringer is adjusted. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A reinforced skin structure comprising:
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an outer wall; a pair of adjacent frame members coupled to said outer wall; at least one stringer coupled to said outer wall and having a length extending between said pair of adjacent frame members; and a vibration damping apparatus coupled to said stringer, said vibration damping apparatus comprising; a stiffening member configured to adjust at least one of a bending mode and a torsional twisting mode of said stringer and extending along at least a portion of said at least one stringer, said stiffening member comprising at least two elongated members spaced a distance apart, extending the length of the at least one stringer such that the torsional twisting mode is adjusted, and oriented substantially parallel to one another and at least one truss member extending obliquely between said at least two elongated members; and an energy dissipation member coupled to said stiffening member, said energy dissipation member configured to dissipate vibrational energy of the stringer. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for damping vibrational energy of a reinforced skin structure that includes an outer wall and, a pair of adjacent frame members coupled to the outer wall, and at least one stringer coupled to the outer wall and having a length extending between the pair of adjacent frame members, said apparatus comprising:
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a stiffening member configured to adjust at least one of a bending mode and a torsional twisting mode of a reinforced skin structure, said stiffening member comprising; at least two elongated members spaced a distance apart, each sized to extend the length of the at least one stringer such that the torsional twisting mode is adjusted, and oriented substantially parallel to one another; and at least one truss member extending obliquely between said at least two elongated members; and an energy dissipation member coupled to said stiffening member, said energy dissipation member configured to dissipate vibrational energy of the reinforced skin structure. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification