Customizable broadband efficient ventilation sound absorber finite element simulation and demonstration verification method

Abstract

The invention relates to a customizable broadband efficient ventilation sound absorber finite element simulation and demonstration verification method. The method comprises. The method comprises the following steps: 1, building a 3D simulation model according to the structure and parameters of an efficient ventilation sound absorber, and building a ventilation pipeline model in COMSOL; 2, endowingthe established 3D simulation model with material characteristics; and step 3, setting a physical field for the established 3D simulation model, setting an outer area of the sound absorber as a soundpressure physical field, and setting an inner area of the sound absorber as a thermal adhesive physical field, and the like. Each sound absorption unit forms a rigid loss oscillator similar to a spring; single-frequency efficient absorption (the average absorption rate is 95%), ventilation (the wind speed ratio is more than 80%), broadband efficient absorption (the average absorption rate is morethan 70%) and ventilation (the wind speed ratio is more than 70%) can be realized, and optimal size parameters are customized for the broadband efficient ventilation sound absorber through finite element simulation and sample verification manufactured by a 3D printer.

Description

technical field [0001] The invention relates to the technical field of low-frequency noise processing, in particular to a method for finite element simulation and demonstration verification of a customizable broadband high-efficiency ventilation and sound absorber. Background technique [0002] Noise cancellation plays an important role in our daily life, especially for low-frequency noise (between 50 and 1000Hz), due to its high penetration, it is still a very difficult task to achieve effective sound absorption of low-frequency noise Work. [0003] Over the past two decades, various acoustic metamaterial absorbers have been proposed to overcome the inherent limitations of natural sound-absorbing materials in handling low-frequency sounds (<1000 Hz). Once the transmission is blocked, they produce high-efficiency absorption at a custom operating frequency. They can control noise and improve the acoustic environment in harsh environments such as damp and confined spaces ...

AI Technical Summary

Problems solved by technology

Such a practical situation has made many previous metamaterial absorbers impossible, because they usually need to completely seal the flow channel to eliminate transmission

Otherwise, if there is a transmission channel, the absorption rate may be greatly reduced, usually cannot exceed 50%

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