空调室外机高频噪声问题分析及优化

Analysis and optimization of high frequency noise of outdoor unit of air conditioner

为了解决空调室外机制热压缩机低频运行时高频尖锐声明显的问题。首先,通过振动源识别,确定高频尖锐声产生的机理;其次,通过载波频率的调制,实现了尖锐噪声的改善。研究表明,尖锐高频噪声是由载波频率激励压缩机电机和风机共同导致,载波频谱呈明显倍频程关系;对于压缩机载波(5 kHz)和风机载波(15 kHz)来说,压缩机载波频率的2倍频及风机载波频率的基频对尖锐噪声的贡献量较大;增大载波频率或者压缩机载波频率和风机载波频率错开调制,都能有效减小尖锐高频声。研究结果可为电机高频噪声的抑制提供参考。

In order to solve the problem of high-frequency sharp noise during low-frequency operation of the compressor of air conditioning under heat-pump condition.Firstly,by identifying the vibration source,determine the mechanism of high-frequency sharp sound generation;Secondly,by modulating the carrier frequency,the improvement of sharp noise is achieved.Research has shown that sharp high-frequency noise is caused by the excitation of the compressor and fan by the carrier frequency,and the carrier frequency spectrum exhibits a significant octave relationship.For the compressor carrier frequency(5 kHz)and fan carrier frequency(15 kHz),the second harmonic of the compressor carrier frequency and the fundamental frequency of the fan carrier frequency have a significant contribution to sharp noise.Increasing the carrier frequency or modulating the compressor carrier frequency and fan carrier frequency in a staggered manner can effectively reduce sharp high-frequency sounds.The results of the research can provide a reference for suppressing high-frequency noise in motors.