Small sample acoustic performance prediction method based on dynamic mechanical parameters under water pressure

By establishing a small-sample acoustic performance prediction method with dynamic mechanical parameters under water pressure, the large measurement error and sample preparation difficulties of viscoelastic materials acoustic performance have been solved, achieving high-precision acoustic performance prediction and supporting the development of acoustic stealth materials.

CN117491486BActive Publication Date: 2026-07-10NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Filing Date
2023-09-25
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies for measuring the acoustic properties of viscoelastic materials suffer from large errors in the low-frequency range, difficulty in sample preparation, and failure to effectively consider the impact of water pressure changes on dynamic mechanical parameters, leading to a deterioration in acoustic stealth performance.

Method used

By establishing a method for predicting the acoustic performance of small samples based on dynamic mechanical parameters under water pressure, and using the calculation formulas for longitudinal wave velocity and attenuation coefficient, combined with the transfer matrix method, the sound absorption coefficient and sound insulation are predicted. A water acoustic tube model is established to obtain acoustic performance parameters under different water pressures.

Benefits of technology

This study achieved high-precision quantitative characterization of the acoustic properties of viscoelastic materials, overcame measurement errors in the low-frequency range and difficulties in sample preparation, and provided an important reference for the development of acoustic coatings.

✦ Generated by Eureka AI based on patent content.

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Abstract

In order to solve the problems of large measurement error of acoustic performance in low frequency range and great difficulty in sample production of the existing pulse sound tube method and free field experiment measurement method for obtaining acoustic performance parameters of viscoelastic materials, the present application provides a prediction method from dynamic mechanical parameters under water pressure to acoustic performance of small samples, comprising the following steps: obtaining the calculation formula of the longitudinal wave speed and attenuation coefficient of viscoelastic materials according to the dynamic mechanical parameters of the viscoelastic materials under different water pressures; establishing an acoustic parameter prediction model of small samples based on a water sound tube and the viscoelastic materials, and solving the acoustic performance parameters of the small samples by the transfer matrix method; combining the calculation formula of the longitudinal wave speed and attenuation coefficient, the acoustic performance parameters of the small samples and the conversion relationship between the dynamic mechanical parameters, to obtain the conversion relationship between the dynamic mechanical parameters and the acoustic performance parameters of the small samples under different water pressures; and based on the conversion relationship, solving the acoustic performance prediction value according to the dynamic mechanical parameters.
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