Broadband measurement method for acoustic performance parameters of large sample materials

Abstract

Abstract In order to measure the acoustic performance parameters of large sample acoustic materials under water and eliminate the influence of wall reflection in limited space, the principle of inverse filtering and transfer function method is used to establish a wide frequency transfer function method for underwater materials under the vertical incidence of sound waves. The acoustic performance test of the 10mm uniform steel plate model shows that the broadband transfer function method is used to improve the measurement, and in the frequency band above 500Hz, the reflection coefficient test deviation is less than 0.1, and the sound insulation test deviation is less than 2dB. Effectively reduced the test limit of the broadband pulse method for underwater measurements.