Abstract: The reliability of the main control board is very important to the normal operation of the air conditioning machine, and the reliability of the main control board is greatly tested by various vibration and shock excitation, so its anti-vibration ability should be fully verified when designing the main control board. The failure mechanism of the bridge pin breaking and falling off occurred in the sweep frequency experiment of the vibration table of the main control board is studied by combining CAE simulation analysis and experiment test. Then, an optimization scheme is proposed to isolate vibration transmission by adding screws. Finally, the effectiveness of the improved scheme is verified by simulation and experiment.

Key words: Air conditioner, Controller, Vibration, Stress