This paper presents the multi-body dynamic model of a drum-type washing machine. This dynamic model is built to be valid and numerically stable for the suspension design optimization by adopting simple assumptions and using approximate modeling techniques. The suspension system includes the friction damper and the flexible hinge, the translational spring, and the rotor. By experiments of a prototype, the dynamic characteristics, such as natural frequencies and corresponding amplitudes could be obtained. They are utilized to tune uncertain model parameters, such as the stiffness and damping of the flexible hinge and the balls. The transient and steady-state amplitudes of the tuned simulation model are good agreement with those of the prototype suspension model. This model can be used to design the suspension of a drum-type washing machine.
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