Abstract: Aiming at the noise reduction requirements of outdoor units of air conditioners, a design of acoustic enclosure by combining theoretical calculation and FEA is adopted. Firstly, according to the structural characteristics of the outdoor unit of the air conditioner, the frame structure of the acoustic enclosure is designed. On this basis, considering the air duct noise and pore leakage, according to the target noise reduction and spectral characteristics, the size of the acoustic enclosure is adjusted, and the sound insulation is checked by the FEA method. The sound pressure level of the final physical test is reduced by 3~4 dB(A). The design method has certain reference significance for solving similar engineering problems.

Key words: Air conditioner, Acoustic enclosure, FEA