期刊
COMPOSITE STRUCTURES
卷 298, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2022.116002
关键词
Acoustic black holes; Cylindrical shells; Component mode synthesis; Substructures; Coupling
资金
- National Natural Science Foundation of China [52171323]
- China Postdoctoral Science Foundation [2018M631194, 2020T130533]
- Fundamental Research Funds for the Central Universities, China [G2022KY05106]
This study investigates a composite cylindrical shell with an internal thin plate and embedded ABHs. By using the Gaussian expansion method and Gaussian expansion component mode synthesis method, the study validates the effectiveness of ABHs in mitigating the vibration and sound power of the shell.
In this paper, we consider a composite cylindrical shell having an internal thin plate. When some ABHs are embedded on the interior floor, the vibration of the cylindrical shell and the sound power radiated from it are expected to be effectively mitigated. To characterize the built-up system, the Gaussian expansion method (GEM) is employed to carry out the modal parameters of the shell and the plate, respectively, where mode truncation is possible for model order reduction. Then the Gaussian expansion component mode synthesis (GECMS) method is developed to describe the final modes of the whole system. The accuracy of the GECMS is validated against reference finite element simulations. To manifest the coupling between the components, the modal participation factors of the shell and the ABH plate are carried out. Furthermore, the sound radiation model for the cylindrical shell is built, together with the non-negative intensity strategy for sound source localization. Results show that the vibration and the sound power level of the shell can be remarkably suppressed, thanks to the exceptional damping effect of the ABHs, especially when the excitation force locates on the ABH plate. The present study is dedicated to pushing the applications of the ABHs.
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