Method for measuring angular spectrum of acoustic transmission performance of large-area hydrophone material

Abstract

The invention relates to a method for measuring an angular spectrum of the acoustic transmission performance of a large-area hydrophone material. According to the method, a broadband transducer with certain directivity and low fluctuation along with frequency and inverse filter compression pulse signals are designed, so that the lowest test frequency of a test sample is reduced to 1 / 2.5 of that of a test sample tested by a conventional method; by implementing the broadband testing technology, work efficiency is greatly improved, and testing time is shortened to a fraction and even one of dozen fractions of testing time spent by the conventional method; and the angular spectrum of the acoustic transmission of a complicated component is measured by reasonably arranging an acoustic field and selecting a proper time window. The method has the advantages that the angular spectrum of the acoustic transmission performance of the component made of the hydrophone material is measured at low frequency, and conflict in aspects of the lowest testing frequency, the testing angle, the size of the test sample and the like is overcome to the greatest extent; the problem of low efficiency of the conventional method is solved, and work efficiency is greatly improved; and the limitation that the conventional method only can be used for testing simple test samples is broken through, and the angular spectrum of the acoustic transmission performance of the complicated component can be measured.

Description

technical field [0001] The invention relates to the field of metrology and testing, specifically to the field of acoustics (underwater acoustics), and mainly relates to a method for measuring the angular spectrum of the sound transmission performance of large-area underwater acoustic materials. Background technique [0002] As the combat acoustic environment of modern ships becomes more and more complex, higher requirements are put forward for various underwater acoustic material components in naval sonar underwater acoustic systems, such as sound-permeable windows, sound baffles and sound-absorbing wedges. On the one hand, the performance of underwater acoustic material components is very closely and sensitively related to the incident angle of sound waves, which is also the main reason for the sharp decline in the performance of sonar in certain wave number directions. However, people have been paying attention to and working on improving the acoustic performance of underw...

AI Technical Summary

Problems solved by technology

However, most underwater acoustic materials have complex structures, which are composed of different base materials in proportion. There are different structures such as cavities and bases, different structural arrangements, and even complex supporting frame structures. Therefore, for most For underwater acoustic material components, the complexity of the structure will inevitably lead to the complexity of the transmitted sound field, which puts forward more stringent requirements for the layout of underwater components

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