本文是在研究枪口噪声声功率与枪口参数关系的基础上,从自由场点声源声压级公式出发,考虑枪口噪声的指向性和衰减规律,建立了描述枪口噪声声压级的预测公式。用几种不同类型、口径和装药量的冲锋枪、步枪和机枪做验证,结果证明预测的精度相当好。有93%以上误差在1.5dB以内,满足了工程设计和枪口噪声评价的要求。 Based on the study of the relationship between muzzle noise power and muzzle parameters, this paper starts from the formula of sound pressure level of free field sound source, considers muzzle noise directivity and attenuation law, The prediction formula. Several sub-machine guns, rifles and machine guns with different types, caliber and charges were used to verify that the prediction accuracy was quite good. More than 93% of the error is less than 1.5dB, which meets the requirements of engineering design and muzzle noise evaluation.