Acoustic treatment device for a ventilation system.

The acoustic treatment device with dimensionally varied resonators addresses the challenge of treating low-frequency noise from vehicle battery cooling systems, achieving efficient noise reduction across a wider frequency range in limited spaces.

FR3140148B1Active Publication Date: 2025-11-07VALEO SYST THERMIQUES SAS
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Patent Information

Application Number
FR2022009584
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-09-22
Publication Date
2025-11-07
Estimated Expiration
2042-09-22

AI Technical Summary

Technical Problem

Conventional acoustic attenuation devices struggle to effectively treat low-frequency acoustic waves generated by vehicle battery cooling systems, particularly in limited spaces like the air intakes or intakes of the front end modules, which cause significant noise pollution both externally and internally.

Method used

An acoustic treatment device with a network of resonators, each having varying dimensions within a row, is used to process multiple frequencies, including Helmholtz resonators arranged around the airflow duct to attenuate a wider frequency bandwidth.

Benefits of technology

The device effectively reduces noise perception both inside and outside the vehicle by treating a broader range of frequencies, optimizing acoustic treatment in a compact form factor without compromising effectiveness.

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Abstract

Title: Acoustic treatment device for a vehicle cooling system. Acoustic treatment device (1) intended to equip a cooling system of a vehicle and comprising at least one wall (4) participating in delimiting a duct (2) for the circulation of an airflow, the acoustic treatment device (1) comprising at least one network of resonators (16) formed by one or more rows (18) of resonators (16) arranged around the duct (2) perpendicular to an axis of elongation (A) of the duct, each resonator (16) of a row (18) of resonators (16) comprising at least one cavity (20) disposed in the wall (4) and a neck (22) connecting said cavity (20) to the duct (2), characterized in that, at least for a given dimension of the cavity (20) or of the neck (22), at least one resonator (16) of the row (18) has a value different from the value of the corresponding dimension of the other resonators (16) of the row (18). (Figure 3)
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