Structured molded parts for sound absorption

US6793037B1 · kind B1 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Gerhard Babuke · Weil der Stadt, DE
• Philip Leistner · Renningen, DE
• Helmut Fuchs · Hall in Tirol, AT
• Xueqin Zha · Eppelheim, DE

Key dates

• Filing date: Sep 13, 2001
• Grant date: Sep 21, 2004
• Expiry date: Sep 13, 2021

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E04B2001/8419
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

Structured pre-form bodies as panel lining for wide-band sound absorption are made of an open-cell foam material having a rigid framework co-vibrating in a resonant manner at low frequencies. The pre-form bodies have a base layer and a columnar structure positioned directly in front of or on the base layer. The columnar structure has a non-symmetrical distribution of height and cross-section, thereby forming a wide-band tuned moderator gap and the columnar height corresponds approximately to the density of the base layer. The columnar structure has a framework resonance adjustable as a function of parameters of the base layer.