A Kind Of Metamaterial Research With Low Frequency Sound Absorption Characteristics

With the development of modern technology,fields such as industry and transportation have gradually shifted from the pursuit of quantity as a priority to quality and absolute speed.is no longer the only goal pursued by the industry,where an important part of the impact on production and quality of life is how to suppress or mitigate Noise pollution.In recent years,a comfortable and quiet acoustic environment has become more and more important for human beings as the awareness of environmental protection has become clearer and clearer.Absorption of irregular sound and reduction of noise pressure levels are becoming an increasingly important part of the sustainable development of high technology,the environment and human health.It is an important research direction,and for the creation and invention of new materials,it will be a comprehensive research involving multiple disciplines.This paper begins with a theoretical study of existing sound absorption techniques,phonon crystals,and acoustic metamaterials through a theoretical approach related to the existing The technical means of sound absorption for engineering applications are digested and understood.Using the acoustic module in COMSOL Multiphysics,a multiphysics field modeling simulation software,the design of an acoustic absorption technique based on the A variety of feasible basic unit structures for the fundamental principles of Helmholtz resonators were further compared and screened using preliminary simulation results Program.Innovative methods are proposed to combine a good match with existing sound-absorbing materials.The sound-absorbing materials are coupled to a variety of solids,such as unit structures and tubular channels,and then by creating an overall acoustic-solid coupling simulation domain,the Simulation calculations of the metamaterial model provide data support for the fabrication of acoustic metamaterial prototypes based on the presented acoustic absorption properties.At the same time,the basic parameters of the existing test environment,such as the reverberation chamber,are measured and extrapolated,and the conditions under which the test can be conducted are evaluated.Preparation and testing of the metamaterial sample.After the test,the overall performance of the metamaterial sample shows the low-frequency absorption performance beyond the sound-absorbing material itself,and the improvement range is relatively small.significantly.According to the test results,an improvement scheme is proposed to further improve the low-frequency sound absorption performance of the metamaterial,and the simulation test of the improved structure further verifies that the improvement scheme has certain feasibility.There are 50 figures,10 tables and 56 references.