Abstract: The research object was the ultrathin drum washing machine, Firstly, the case was simulated by Simcenter3D simulation software, to got the natural frequency and mode of vibration. Secondly, the modal test of the case was designed, to verified the accuracy of simulation analysis. Last but not the least, the case structure was topologically optimized and verified by simulation. According to the research, the reasonable reinforcement structure was designed, the first natural frequency of the case was increased from 36 Hz to 70.9 Hz, to improve the rigidity of the case, to avoided resonance phenomena caused by external excitation, and to reduced vibration and noise of the whole machine.

Key words: Drum washing machine, Ultrathin case, Simcenter3D