This paper will examine use of the sound intensity measurements to calculate sound power levels of enclosed gear drives
under full load. Important characteristics of the test environment will be discussed. Acoustic intensity concepts and
theory will be presented. Equipment requirements and acoustic requirements of the sound field for collecting accurate
data will be discussed. Actual sound intensity data with a discussion of measurement quality indicators are included.
Finally, a case study will be presented that ilustrates how this data was used to validate a design improvement.
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