Pelzer Acoustic Products Gmbh

Entwicklungsgesellschaft Fur Akustik (efa) MIT Beschrankter Haftung

Clion Ireland Holding Ltd.

Adler Pelzer Holding Gmbh

Hp Pelzer Holding Gmbh

Hans-Peter Keller

Volkmar Schulze

Norbert Nicolai

Marco Schneider

Volker Kursch

Rod Morris-Kirby

Colm Doris

Olaf Dohring

Olaf DÖHRING

A trim panel for an aircraft interior includes a first sound attenuating layer, a structural layer and a second sound attenuating layer. The structural layer is coupled to the exterior sound attenuating layer, and has an exterior side and an opposite interior side. The structural layer defines a plurality of passages that open to both the exterior side and the interior side so as to minimize radiation of noise due to a hydrodynamic shortcut created by each of the passages across the structural layer. The second sound attenuating layer is coupled to the structural layer and has a high sound absorption characteristic. The second sound attenuating layer is configured to be disposed adjacent to the aircraft interior.

Aircraft trim panel with integrated adjustable acoustic properties

The invention relates to a multilayered acoustically and thermally effective insulation having a defined layer structure, especially for internal combustion engines of motor vehicles.

Acoustically and thermally acting insulation

The present invention relates to a sound absorber consisting of a first non-woven fabric facing towards the sound-emitting source having a layer thickness within a range of from 2 to 15 mm, a density within a range of from 50 to 500 kg/m, a weight per surface area within a range of from 0.1 to 2.5 kg/m, and a flow resistance within a range of from 50 to 1000 kNs/m, and a second non-woven fabric facing away from the sound-emitting source has a layer thickness within a range of from 10 to 28 mm, a density within a range of from 20 to 100 kg/m, a weight per surface area within a range of from 0.4 to 1 kg/m, and a flow resistance within a range of from 10 to 40 kNs/m.

Sound absorbers

Growing community of inventors

Suhr, Switzerland

Hans-Peter Keller