Noise Radiation Characteristics of the Washing Machine Based on Sound Intensity Measurement

Based on the sound intensity measurement and analyzing, the noise radiated from the washing machine with horizontal axis was discussed to identify the noise source and find its propagation path. According to the principle of the sound intensity measurement, the measurement grids were arranged at the outside surfaces of the washer, and the distance was set to 20cm. The result showed that the noise source was near the right surface of washer's motor installing. The maximum sound intensity values are mainly in frequency bands of 2 KHz and 4 KHz. Back surface of washer with sound power level 51 dB radiated the maximum sound intensity value 55.8 dB for 2 KHz and 56.0 dB for 4 KHz. There was also appeared the maximum sound intensity of low frequency 100 Hz in Right surface, which was caused by the vibration of motor transferring to the right surface shell. The results can provide technology support for the noise control of washing machine.