Sound absorption structure

Details Sound absorption structure Sound absorption structure

1996-11-27

1998-07-21

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181249, 181250, 181252, 181257, 181273, F02M 3500

Patent

active

057837805

ABSTRACT:
A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material is installed, and a Helmholtz resonator. The extended duct portion is formed such that a representative diameter of the extended duct portion is greater than that of the base duct portion while connected to the base duct portion. The Helmholtz resonator is set to be resonant at a frequency corresponding to a frequency range of a resonance generated by the installation of the extended duct portion including the sound absorption material. The Helmholtz resonator is integrally formed with the extended duct portion. Therefore, the sound absorption structure ensures an excellent sound absorption ability in the whole frequency range.

REFERENCES:
patent: 4211303 (1980-07-01), Matthews et al.
patent: 4523662 (1985-06-01), Tanaka et al.
patent: 4841728 (1989-06-01), Jean et al.
patent: 4892168 (1990-01-01), Sasaki et al.

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