Measurement of Acoustic Signals to Characterize Household Appliance Based on Sound Power and Directivity Analysis

Measurement of acoustic signals to characterize the household appliance is very important for developing appropriate measures to avoid health hazards of in-house personnels. Acquisition and characterization of loud noise generated from a vacuum cleaner as a household machine is presented in the present paper. The common assumption regarding the community noise level is that the directivity of the sound radiation from a machine or any acoustic source is axisymmetric. However, it is true that this assumption does not valid when the condition of flow does not hold on. Particularly, if the characteristics of the sound source changes regarding to the signal features like frequency, intensity the directivity pattern of the sound radiation also changes. This characteristic has great influence to the noise reduction process as well. In the present paper the directivity of sound signal has been analyzed in anechoic chamber. Remarkable variations in acoustic signal propagation from the vacuum cleaner are recorded in the case of varying signal frequency with significant acoustic features. Furthermore, signal power from the tested devise is also clarified accordingly. Keywords: Acoustic Measurement, Sound Pressure Level, Directivity Analysis, Signal frequency, Household Appliance