CAJ | 학술논문

用驻波管四传声器法，分析了透射管中多次透射反射波对隔声量测试结果的影响，在考虑所有多次透射反射波的因素后推导了修正计算公式。通过对不同样品的测试，比较了考虑所有透射反射波的修正方法与仅考虑第一次透射反射波的修正方法的区别。实验结果表明：采用吸声性能优良的透射管声学末端，考虑一次透射反射波的修正方法可以得到正确的测量结果；而如果采用吸声性能较差的透射管声学末端，则应该考虑到所有高次透射反射波的影响。
용주파관사전성기법，분석료투사관중다차투사반사파대격성량측시결과적영향，재고필소유다차투사반사파적인소후추도료수정계산공식。통과대불동양품적측시，비교료고필소유투사반사파적수정방법여부고필제일차투사반사파적수정방법적구별。실험결과표명：채용흡성성능우량적투사관성학말단，고필일차투사반사파적수정방법가이득도정학적측량결과；이여과채용흡성성능교차적투사관성학말단，칙응해고필도소유고차투사반사파적영향。
Based on the four-microphone method of the standing-wave pipe, the effect of the multi-transmitted-and-reflected waves in the transmission pipe on the sound transmission performance is discussed. The modification formula associated with the multi-transmitted-and-reflected waves is derived. By measuring several samples in the standing-wave pipe, the difference between the overall multi-transmitted-and-reflected modification and only the first transmitted-reflected modification is compared. Experimental results show that if the sound absorption performance of the acoustical terminal is perfect, the first transmitted-reflected modification is good enough to obtain the accurate sound transmission loss;while the sound absorption performance of the terminal is not perfect as the expected, the overall multi- transmitted-reflected modification should be taken into account.