Acoustically optimized screen for use in air-guiding tubes in an aircraft

WO2026077858A3 Publication Date: 2026-06-18DIEHL AVIATION LAUPHEIM GMBH +4
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
DIEHL AVIATION LAUPHEIM GMBH
Filing Date
2025-10-06
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing air duct systems in aircraft air conditioning generate significant airflow noise, necessitating additional silencers which increase cost, weight, and installation space, while current orifices are tuned to higher frequency ranges and do not effectively minimize flow noise.

⚗Method used

The introduction of acoustically optimized baffles with various geometric designs, including funnel shapes, Helmholtz resonators, sawtooth structures, and rectifiers, tailored to specific airflow conditions to reduce noise by minimizing flow noise from the outset.

🎯Benefits of technology

The baffles significantly reduce airflow noise, eliminating the need for additional silencers, thereby reducing system weight, cost, and installation space while maintaining passenger comfort by optimizing acoustic properties.

✦ Generated by Eureka AI based on patent content.

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Abstract

A screen (14) of an air duct (8) of an air-conditioning system (6) of an aircraft (2) contains a main part (16) and at least one duct (18a-e) in the main part (16), wherein the screen (14) is designed to be acoustically optimized with regard to flow noises during operation (B) by virtue of the following variants: a channel (18a-e) has a tapering funnel shape (24a,b), and / or a channel (18a-e) has a lateral opening (32) with an adjoining cavity (34), which form a Helmholtz resonator, and / or the outlet end (28) of a channel (18a-e) is a free end (46) with a sawtooth structure (30) surrounding the channel (18a-e), and / or a channel (18a-e) in the form of a slot (38) has a constant cross-section throughout, and / or a channel (18a-e) has a circular, elliptical, or slot-shaped cross-section, and / or the upstream end face (42) of the main part (16) supports pointed shapes (44) which taper opposite the flow direction (10). A duct assembly (50) contains the air duct (8) with screens (14) in the assembled state (M).
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