Static structures (e.g. – buildings) – With exposed configuration having acoustical function – Absorbing material behind foraminous facing sheet
Patent
1983-09-27
1986-01-28
Kelly, Donald G.
Static structures (e.g., buildings)
With exposed configuration having acoustical function
Absorbing material behind foraminous facing sheet
52167, 52403, 52727, 52729, 181208, 181290, E04B 198
Patent
active
045662312
ABSTRACT:
A vibration dampening stiffener beam (10, 10') is secured to a panel member, such as an electrical circuit board (12) that is supported at opposed ends. The beam (10, 10') extends across a mid portion of the board (12) whereat displacement of the board caused by vibration is at a maximum. The beam is an "I" beam or an inverted "T" beam. It has a mounting flange (22, 22') which is bonded or otherwise secured to the member (12) which it is to stiffen. An energy absorbing material (30) is placed on the sides of the web (24, 24') of the beam (10, 10"). This material (30) consists of thin metal constraining layers (32) bonded to each other and to the side surfaces of the web by means of a viscoelastic material (34).
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Barnard Delbert J.
Chilcot Jr. Richard E.
Kaser Bruce A.
Kelly Donald G.
The Boeing Company
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