消声器声学特性数值模拟及结构优化设计

Numerical simulation and structural optimization design of acoustic characteristic for muffler

针对某款电冰箱压缩机在噪声频谱中800 Hz频段运行时噪声偏大,基于声学理论基础,构建消声器的物理模型和数学模型,采用数值模拟的方法,得出噪声在消声器内部的传递特性及声压分布。在此基础上,提出消声器结构优化方案,进行数值模拟和实际测试,所得结果一致性较好。测试所得的优化前、后消声器制冷量等性能相差均小于1%,优化消声器在800 Hz频段噪声明显下降。

In view of the noise of one refrigerator compressor is very loud when working at the frequency range of 800 Hz in the noise spectrum, the physical model and mathemat-ical model of muffler are constructed based on the acoustic theory. The transmission char-acteristics of noise and acoustic pressure distribution in the muffler are obtained using the numerical simulation method. A structure optimized scheme of the muffler is proposed on the basis of the simulation analysis？ and the simulation results are coincident with the test results. The differences of the cooling capacity and other properties between the optimized muffler and the original one are within 1 % 9 and the noise of the optimized muffler is de-creased obviously at the frequency range of 800 Hz in the test.