Abstract
As part of E‐A‐R's technical expansion program for its noise and vibration control laboratory, an interim hemi‐anechoic room has been added to the facilities. Consistent with collection of quality acoustic data, special acoustic environments need to be understood. To accomplish this, ANSI Standard S1.35‐1979, “Precision Methods for the Determination of Sound Power Levels of Noise Sources in Anechoic and Hemi‐Anechoic Rooms,” was selected as both a tool to guide study of the room and a documentation procedure to provide assurance to subsequent recipients of results of tests performed in the room. This paper will discuss the specific test procedures used to qualify the room under the standard, data analysis techniques used, and the idiosyncracies involved in performing tests of this type.
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