Abstract
Presently accepted acoustical‐measurement standards are not adequate for sound power level determination of large machines such as turbine‐generators in power plants. These standards yield erroneous values of sound power level particularly as a result of measurement environment and background noise effects. Sound pressure levels measured around a number of fossil turbine‐generator units were used to investigate the influence of several sources of error. This data showed that a simplified measurement sample would yield adequately small errors. “Upper estimates” of turbine‐generator sound power level, calculated using this scheme with environmental corrections based upon ISO/DIS 3746 and without corrections for background noise, resulted in only moderate scatter. This procedure, with the incorporation of a suitable background‐noise correction method—possibly via directional microphone, is promising and should be explored in future studies.
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