Abstract
In this study, for considering effective countermeasures toward vibration of drum type washing machine through an experiment with small man-hour, main drum vibrations for spin-drying were analyzed and principal parts affecting the main vibration were selected through an analyze of actual vibration shape and basic vibration calculation. In the experiment, first order rotation vibration of each part of a drum type washing machine such as spring damper attachment point was measured for spin-drying mode. The result shows the vibration of a drum was high at 150 and 300 rpm. In addition, the drum was found to move along horizontal axis at 150 rpm and move along vertical axis mainly at 300 rpm by the actual vibration shape analysis. Then, the vibration response was calculated by applying a basic vibration theorem using spring constants and damping coefficients for horizontal and vertical axes of two spring damper systems supporting the drum by regarding these systems as the principal parts for the main vibrations. As a result, the resonance frequency and amplitude of calculated vibration response were similar with the measured vibration. From these experimental and analytical results, it was found that vibration of the drum type washing machine was affected by parameters of the spring damper systems mainly and the vibration is considered to be controlled effectively by changing these parameters, even though the drum connects various parts in actual.
