Thorsten Alts

Vibration-damping inside roof construction

A roof construction has vibration dampening ability and includes a body member in contact with a waffle-like surface of a moulded porous compressed fibrous web which is designed to have a self-supporting stability. The waffle-like surface exhibits an anisotropic air resistant structure.

Sound damping multi‐layer structure

A sound-absorbing multi-layer structure is disclosed comprising a structural part which is capable of oscillating and a loosely engaging damping sheet, which sheet comprises a flexible material and high material absorption factor and is made up of a heavy sheet with a viscoelastic support layer tightly connected thereto. The support layer comprises a plurality of angularly constructed support elements which are shaped and arranged so that together with the structure which can oscillate and the flexible heavy sheet they form a coherent labyrinth of hollow spaces with acoustically effective cavities.

SOUND-INSULATING AND SOUND-DAMPING COMPOSITE STRUCTURE

A composite structure with sound-insulating and sound-damping effects for use on the interior surfaces of motor vehicles, comprising at least two groups of coatings resting loosely on one another. In particular, the first group consists of a bottom part (2) free to vibrate and provided with coatings (6) or a finish like that used in modern motor vehicle construction. Preferably the applied second group of coatings consists of an insulating coating (8, 9). This insulating coating can be provided with an additional protective layer (7) and/or a textile or textile-like decorative layer (5). According to the invention, insulating coating (8, 9) exhibits anisotropic air flow resistance. This is achieved in simple fashion by a carrier layer (9) with a geometric structure and a plurality of support 15 elements (13). These support elements (13) are formed essentially of narrow ribs and are arranged to form a complex cavity labyrinth in conjunction with the first group of coatings and thus permit lateral air flow with low flow resistance.