改善矩形清洗槽内声场均匀性的研究

Improvement on acoustic field uniformity in rectangular cleaner

基于声波叠加原理以及有界空间的波动声学理论分析了矩形槽式超声波清洗机的声场分布,并利用铜版纸染色法进行了实验研究。结果表明:单频正弦信号激励时,声源频率越高,声场分布越均匀;与正弦信号激励相比,合成信号激励下声场均匀性明显改善,且频率越高,改善效果越明显;本实验中,频率分别为23.94,36.08,56.77k Hz的清洗槽,合成信号的最佳实验宽度在1—2 k Hz,而合成信号最佳带宽应结合具体清洗系统的谐振特性合理选择。

The acoustic field distribution of rectangular groove type ultrasonic cleaning machine was analyzed according to sound wave superposition principle and bounded space acoustics theory, and the coated paper dyeing method was used for the experimental study. The results show that the higher frequency of the acoustic source, the more uniformity of the acoustic field distribution when the sine signal of single-fi-equency is used ; compared with the sinusoidal signal, sound field uniformity is obviously improved by the incentive of synthetic signal, and with the frequency increasing, the effect of improvement is more obvious; the best experimental width of the synthesis signal is about 1-2 kHz for the cleaner of 23.94, 36.08, 56.77 kHz respectively. So the bandwidth of synthetic signal should be made with a reasonable choice based on the resonance characteristics of cleaning system.