Equalization of acoustic source using multi-pole sources and source strength estimation using inverse method

• A general model has been presented which is not exclusive to fans and blades.
• The presented model comprehensively takes into account multi-polar sources and is not exclusive to only one specific type.
• Lateral quadrupoles have not been modeled in any of the mentioned references.
• In this study, measurement location and its effects on the model have been studied.

Sound measured at various points around the environment can be evaluated by a series of multi-pole sources and their acoustic strength can be acquired. In this numerical study, a method, called the inverse method, was examined to achieve this goal. A variety of arrangements of different sources were considered and the acoustic strength of these sources was acquired. Through the application of the mismatch criterion, good conformity was observed between these sound models and the original sound. Furthermore, with regard to results, sound was generated via different source arrangements which showed acceptable agreement with the original sound. Finally, an arrangement named ‘sources vertical arrangement’ was selected as the best approach.