Caterpillar Inc.

Emile E Damotte

James John Callas

David C Copley

Mark B Sutherland

Kristian M Stoeckel

John T Leonetti

A noise suppression louver for an enclosure, in particular, an apparatus for suppressing sound at the openings which allow air to enter or exit an internal combustion engine enclosure. The louver comprises a matrix of intersecting horizontal and vertical passive sound absorptive slats.

Noise suppression louver having horizontal and vertical slats

A plurality of acoustical absorption elements are mounted in a two-dimensional spaced array on an acoustically reflective surface of an machinery enclosure, in such a manner as to expose portions of the reflective surface between neighboring elements. The elements are preferably of a substantially standard size and shape in order to enhance production and inventory efficiency, although materials of various thickness may be provided to accommodate tuning for specific frequencies to be absorbed.

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Pekin, IL, United States of America

Emile E Damotte