A selective method to separate the acoustic intensity vector, estimated from two closely spaced microphones, into components related to the individual sources is discussed. The method, which is based on the application of a multiple-input/two-output frequency domain model, is briefly reviewed. Pragmatic concerns regarding the phase matching of the microphones and model validation are discussed. The method is applied to a power hand drill to separate the cooling air flow noise from the mechanical vibration-related noise. The analysis showed that the flow noise was the dominant broadband source while the vibration related component was tonal in nature and dominant in specific frequency regions.
All Science Journal Classification (ASJC) codes