Multi-objective optimization of muffler for vehicle air-conditioning compressor pipeline

Abstract

The noise reduction of air-conditioning systems has gradually become an urgent problem linked to the requirement of driving comfort, and the muffler is a commonly used noise reduction equipment for air-conditioning pipelines. In this study, the transmission loss of a prototype muffler is co-simulated at different speeds. To optimize the muffler, a new method that combines orthogonal and detailed optimization was proposed. In orthogonal optimization, a multi-objective orthogonal test was used to analyze the effect of four structural parameters (shoulder height, cavity length, cavity diameter, and intubation length) on the average transmission loss, transmission loss at 1120 Hz, and frequency bandwidth below 4 dB. The influence of different factors on the transmission loss was studied at different speeds, and it was found that the length of intubation had a significant impact on the transmission loss. In a detailed optimization, the method is characterized by rapidity in the design of the air-conditioning system of a vehicle, and the final optimization model is determined. The results showed that the optimized structure was better than the original structure. The maximum reduction in the average noise can reach 11.99 dB, and the maximum noise reduction at 1120 Hz can reach 8.58 dB.