船用空调阻性消声器消声量计算方法优化的实验研究

Experimental Study on Optimization of the Calculation Method for Sound Attenuation of Resistive muffler in Marine Air Conditioning

在船用空调系统中,由于已有的阻性消声器消声量的经验公式忽视了高频失效效应的影响,使得原有的消声量计算方法在高频段不再适用,为了探究出一个符合船用空调阻性消声器消声量的计算公式,通过分析实验数据,选择一个与模型相适应的经验公式,最终在此基础上结合实际工况对经验公式进行修正与检验。结果表明:当频率处于中低频时,罗杰斯公式的消声量计算值与插入损失值的变化趋势十分接近,误差在4dB左右,但在高频段,由于高频失效效应,经验公式不再适用;其次拟合出来的经验公式修正式,在倍频程下的消声量值与实际工况相互一致,误差低于3dB,满足实验预期要求。

In marine air conditioning systems,due to the neglect of high-frequency failure effects in the existing empirical formulas for the noise reduction of resistive silencers,the original calculation method for noise reduction is no longer applicable in the high-frequency range.In order to explore a calculation formula that conforms to the noise reduction of resistive silencers,this article analyzes experimental data and selects an empirical formula that is suitable for the model,Finally,based on this,the empirical formula was revised and verified in conjunction with actual operating conditions.The results show that when the frequency is in the middle and low frequency range,the variation trend of the noise reduction calculated by the Rogers formula is very close to the insertion loss value,with an error of about 4dB;However,in the high-frequency range,due to high-frequency failure effects,empirical formulas are no longer applicable;Secondly,the fitted empirical formula correction formula shows that the noise reduction value at the octave is consistent with the actual operating conditions,with an error of less than 3dB,meeting the expected requirements of the experiment.