{"title":"Tunable acoustic metasurface for broadband asymmetric focusing based on Helmholtz resonator","authors":"","doi":"10.1016/j.jsv.2024.118628","DOIUrl":null,"url":null,"abstract":"<div><p>This work presents an innovative type of acoustic metasurface structure based on the Helmholtz resonator in order to generate an acoustic metasurface with multifunctional effects, such as configurable asymmetrical focusing. With the aim to accomplish a flexible regulation of the complete phase of the sound waves, a new cell structure is constructed by incorporating the Helmholtz resonator height gradient change, resulting in the multifunctional design of an acoustic metasurface via simulation. The metasurface structure parameters, which include the aperture width and the Helmholtz cavity width, are adjusted to attain improved sound focusing and a higher transmission rate. According to the results, the metasurface has an asymmetric focusing influence on a greater frequency range of 2845∼3620 Hz, which is raised by 10.71% compared to the highly uniform symmetric cell structure. The transmission of the cell structure is also higher than 0.96. In the meantime, the sound waves can be actively controlled by adjusting the interlayer spacing and incident angle. This results in a specific adjustable range along the <em>x</em>-axis within 0.22 ∼ 0.87 m and the <em>y</em>-axis within -0.278 ∼ 0.278 m of the focusing location. The outcomes of this investigation may find use in ultrasonic treatment and ultrasonography.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3000,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sound and Vibration","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022460X24003900","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ACOUSTICS","Score":null,"Total":0}
引用次数: 0
Abstract
This work presents an innovative type of acoustic metasurface structure based on the Helmholtz resonator in order to generate an acoustic metasurface with multifunctional effects, such as configurable asymmetrical focusing. With the aim to accomplish a flexible regulation of the complete phase of the sound waves, a new cell structure is constructed by incorporating the Helmholtz resonator height gradient change, resulting in the multifunctional design of an acoustic metasurface via simulation. The metasurface structure parameters, which include the aperture width and the Helmholtz cavity width, are adjusted to attain improved sound focusing and a higher transmission rate. According to the results, the metasurface has an asymmetric focusing influence on a greater frequency range of 2845∼3620 Hz, which is raised by 10.71% compared to the highly uniform symmetric cell structure. The transmission of the cell structure is also higher than 0.96. In the meantime, the sound waves can be actively controlled by adjusting the interlayer spacing and incident angle. This results in a specific adjustable range along the x-axis within 0.22 ∼ 0.87 m and the y-axis within -0.278 ∼ 0.278 m of the focusing location. The outcomes of this investigation may find use in ultrasonic treatment and ultrasonography.
期刊介绍:
The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application.
JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.