CITIC Group has patented a sound absorber designed as a rectangular box with a double-layer Helmholtz resonance structure. The absorber, when mounted on a moving component in an air environment, reduces acoustic resonance by combining Helmholtz and structural resonance absorption techniques. GlobalData’s report on CITIC Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on CITIC Group, was a key innovation area identified from patents. CITIC Group's grant share as of March 2024 was 61%. Grant share is based on the ratio of number of grants to total number of patents.
Sound absorber for reducing acoustic resonance in moving components
A recently granted patent (Publication Number: US11951778B2) discloses a sound absorber designed to reduce acoustic resonance in an air environment, particularly when mounted on a moving component. The sound absorber is configured as a rectangular hexahedral box with a porous double-layer Helmholtz resonance sound absorbing structure. It includes two sides, a partition dividing the inside into two cavities, and hollow tubes extending into these cavities. The structural parameters of the box are determined by the desired sound absorption coefficient and amount, including plate thicknesses, orifice diameters, lengths of the tubes, and cavity shapes and volumes.
Furthermore, the patent also covers the application of this sound absorber in wheels to reduce acoustic resonance in wheel air chambers. The sound absorber can be mounted on the hub of a wheel, with the bottom surface of the box attached to the rim bottom surface of the hub. The absorber is fixed using a band and can be made of metal or plastic, forming a structural resonance sound absorbing device itself. Multiple sound absorbers can be arranged on the hub in various configurations to effectively reduce acoustic resonance in the wheel air chamber. The patent also details the use of a U-shaped groove on the top surface of the box for band fixation, with adjustable fastening force mechanisms for secure attachment.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
