Caterpillar Inc.

Mark B Sutherland

Emile E Damotte

John T Leonetti

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.

Acoustical absorber array

Apparatus for automatically determining the total sound power emitted by a work machine. The noise testing system employs a processor and remote control to control the measurement of both exterior and interior sound generated by a work machine in either a dynamic or static operating mode.

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Peoria, IL, United States of America

Mark B Sutherland