Abstract: The method of combining modal analysis and topology optimization is used to design the motor bracket of the window air conditioner, so that its natural frequency can meet the vibration reduction requirements, and the weight of the motor bracket can be reduced to the greatest extent. First, ANSYS is used to conduct a modal simulation analysis of the motor bracket, and then B&K equipment is used to conduct a modal test of the motor bracket to check the boundary conditions of the simulation model. On this basis, the topology optimization of the motor bracket is carried out, the natural frequency is set as the objective function, and the weight reduction percentage is set as the constraint condition. The result of the final optimization is that the natural frequency of the motor bracket is increased by 3 Hz, avoiding the rotation frequency of the motor, and the weight of the motor bracket is reduced by 14%.

Key words: Window air conditioner, Modal analysis, Topology optimization