Review on vibration reduction of a vertical axis drum based washing machine

Vibration

Today, there is a rapid increase in the demand for saving energy in all industries and industrial applications and even in home appliances such as microwaves, refrigerators, air conditioners, power tools, vacuum cleaners and washing machines. In a fully automatic washing machine, an unbalanced mass of clothes in a spin drum can cause vibration problems. Each time a washing machine enters its spin cycle, it begins to create high frequency vibrations.  The unbalanced mass of clothes causes vibration because in the spin drying stage, the drum spins at a relatively high speed causing the clothes to be pressed against the inner wall of the spin drum and this can become a large unbalanced mass until the end of the stage. In this review paper the causes of mechanical vibrations and different methods to reduce vibrations in washing machine are studied. From the research it is concluded that adding springs and dampers to the machine can cause the major reduction in the vibrations.

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