消声室尖劈的声学指标通常是用低频的截止频率来描述,即在截止频率以上,垂直入射吸声系数必须等于或超过0.99,因此鉴定尖劈的主要目的就在于确定其是否符合此项声学指标。直到目前,测量失劈吸声系数的唯一方法是单频的驻波比法(SWR法)。但是,我们在最近的一系列鉴定中已采用了 The acoustical index of a muffler wedge is usually described by the cutoff frequency of the low frequency, that is, the vertical incidence absorption coefficient must be equal to or more than 0.99 above the cutoff frequency, so the main purpose of the identification wedge is to determine whether it meets the requirement Acoustic indicators. Up until now, the only way to measure the sound absorption coefficient of the split was the single-frequency SWR method. However, we have adopted it in a recent series of evaluations