Abstract
In order to reduce the noise level emitted from home use automatic washing machines with vertical axis of rotation, it is important to identify the mechanism how vibrations are converted into noise. We assumed that the vibration of the drum suspended by four suspension dampers is one of the exciting sources to the outer panel of the washing machine. In this paper, first experimental results of damping characteristics of single suspension damper is introduced and then results of measurement of drum vibration together with noise level of an automatic washing machine are summarized. In addition, modeling procedure for analyzing the vibration of a drum is introduced and resonant characteristics are calculated.
