Predicting environmental noise from industrial exhaust stacks

摘要

It is important to correctly define and quantify the sound power level of the exhaust stack exit both during design and when measuring the source under operational conditions. Use of ISO 10494 can present some difficulties and errors, although it is recognised that it at least provides a consistent and standardised method for comparing the noise emitted by stacks. A revision to the standard would be most welcomed, clarifying that the method does not yield the "true" sound power level of the stack but rather a pseudo sound power level which might not be suitable for use in environmental noise propagation modelling. It is recommended that the standard should also be revised to include a method for determining the sound power level of a stack suitable for use in noise modelling, e.g. by measuring at a defined position and correcting for directivity or by measuring at a position where there is no need to make this correction.