Damping device for damping notably the vibrations relative to a

Details Damping device for damping notably the vibrations relative to a Damping device for damping notably the vibrations relative to a

1986-12-30

1988-08-23

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428246, 428247, 428250, 428256, 428284, 428285, B32B 700

Patent

active

047660287

ABSTRACT:
The invention concerns a damping device having improved damping properties, including a lower damping viscoelastic layer made from a viscoelastic material affixed to a structural element, and an upper stress constraining layer located above the lower viscoelastic layer on the side opposite of the structural element. The upper stress constraining layer is a composite stress constraining layer having a stress constraining element embedded in a damping material. This stress constraining element can be a clothlike element selected from a knit, a woven or unwoven fabric, or can be prepared from a grid of bundles of strands linked together through welding or gluing.

REFERENCES:
patent: 3399104 (1968-08-01), Ball et al.
patent: 4056161 (1977-11-01), Allen, Jr.
patent: 4278726 (1981-07-01), Wuene
patent: 4283457 (1981-08-01), Kolsky et al.
Frequency and Loss Factors of Sandwich Beams Under Various Boundary Conditions, D. K. Rao, J. M. E. Science, 20 (5), p. 271, 1978.
Free Vibration of Thin Walled Open Section Beams with Constrained Damping Treatment, S. Narayanan, et al., J. of Sound and Vibration, 74 (3) 1981.

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