초록 ▼

A method and apparatus for damping the vibration of a reinforced skin structure (e.g., the fuselage of an aircraft) over a wide frequency range (wideband) in order to reduce the vibration and transmitted noise, and improve the sonic fatigue life, of the structure is disclosed. Wide range damping is

A method and apparatus for damping the vibration of a reinforced skin structure (e.g., the fuselage of an aircraft) over a wide frequency range (wideband) in order to reduce the vibration and transmitted noise, and improve the sonic fatigue life, of the structure is disclosed. Wide range damping is accomplished by viscoelastically attaching constraining elements, which can be continuous or segmented, to the skin and to the reinforcing members that support the skin. The viscoelastic attachment between the constraining elements and the reinforcing members directly damp the vibrations of the reinforcing members; and, the viscoelastic attachment between the constraining elements and the skin directly damp the vibrations of the skin. Further, the regions of the constraining elements extending between the regions viscoelastically attached to the reinforcing members and to the skin forms a coupling that allows the skin viscoelastic attachment to indirectly damp the vibrations of the reinforcing member and vice versa. Resonant vibrations due to skin bending, torsional and extensional modes (both cylindrical and panel) and reinforcing member bending, torsional, extensional and tuning fork modes, are all damped.

대표청구항 ▼

A method of damping the vibrations of spaced-apart vibrating regions of selected different elements of the skin and reinforcing members of a reinforced skin structure, said method comprising the steps of: bridging the space between said spaced-apart vibrating regions of said selected different eleme

A method of damping the vibrations of spaced-apart vibrating regions of selected different elements of the skin and reinforcing members of a reinforced skin structure, said method comprising the steps of: bridging the space between said spaced-apart vibrating regions of said selected different elements of the skin and reinforcing members of said reinforced skin structure with an elongate, rigid constraining element having flat regions positioned to overlie each of the spaced-apart vibrating regions of said selected different elements of the skin and reinforcing members of said reinforced skin structure; and, attaching each of said overlying flat regions of said elongate, rigid constraining element to the underlying vibrating region of said selected different elements of the skin and reinforcing members of said reinforced skin structure with a layer of viscoelastic material.