Constructional element with acoustic properties

US4782913A · kind A · utility

Assignee

• Dr. Alois Stankiewicz GmbH · DE

Inventors

• Manfred Hoffmann · Würzburg, DE
• Norbert Seemann · Bad Doberan, DE

Key dates

• Filing date: May 4, 1987
• Grant date: Nov 8, 1988
• Expiry date: May 4, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R13/0861
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A three-dimensional, formable constructional element (1) with acoustic properties is provided, having a shell (2) with a low natural bending stiffness to which webs (3) are fixed so as to form a cellular grid. It is important that over the whole extent of the shell (2) the dimensions both of the webs (3) and of the cells (4) that they form together with the shell (2), and also the shape of the shell (2) itself, can be freely chosen. The cells (4) are closed on the outside on the side distant from the shell (2) by a foil system (5) that includes flattened, in particular lens-shaped, air pockets (6). In this way optimum acoustic tuning can be achieved in respect of the incident sound waves on the air-filled cell chambers utilizing frictional damping, so as to achieve maximum absorption of airborne sound.