TY - GEN
T1 - Annular acoustic black holes to reduce propagative Bloch-Floquet flexural waves in periodically supported cylindrical shells
AU - Jie, Deng
AU - Oriol, Guasch
AU - Laurent, Maxit
AU - Ling, Zheng
N1 - Funding Information:
This work has been completed while the first author was performing a two-year PhD stay at La Salle, Universitat Ramon Llull, funded by the National Natural Science Foundation of China under Grant (51875061) and the China Scholarship Council (CSC No. 201806050075). The authors gratefully acknowledge this support as well as the in-kind assistance from La Salle, Universitat Ramon Llull, and the Chongquing University to make that collaboration possible. The second author would also like to thank l'Obra Social de la Caixa and the Universitat Ramon Llull for their support under grant 2018-URL-IR2nQ-031
Publisher Copyright:
© INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.
PY - 2019
Y1 - 2019
N2 - Current designs of acoustic black holes are mainly intended for straight beams and flat plates. However, many structures of interest in naval and aeronautical applications essentially consist in a periodically stiffened cylindrical shell, which could benefit from the acoustic black hole (ABH) effect to reduce vibrations and noise radiation. In this work, we suggest the design of annular ABHs to that purpose. To test the feasibility of such annular ABHs we consider the idealized case of a periodically simply supported cylindrical shell of infinite length. Such a structure allows for the propagation of Bloch-Floquet flexural waves at some passbands, which can play an important role in the radiation of noise at the far field. By means of wave finite element models, we show that the proposed annular ABHs constitute an effective way of reducing the shell flexural motion.
AB - Current designs of acoustic black holes are mainly intended for straight beams and flat plates. However, many structures of interest in naval and aeronautical applications essentially consist in a periodically stiffened cylindrical shell, which could benefit from the acoustic black hole (ABH) effect to reduce vibrations and noise radiation. In this work, we suggest the design of annular ABHs to that purpose. To test the feasibility of such annular ABHs we consider the idealized case of a periodically simply supported cylindrical shell of infinite length. Such a structure allows for the propagation of Bloch-Floquet flexural waves at some passbands, which can play an important role in the radiation of noise at the far field. By means of wave finite element models, we show that the proposed annular ABHs constitute an effective way of reducing the shell flexural motion.
KW - Acoustic black holes
KW - Bloch-Floquet waves
KW - Cylindrical shells
KW - Periodic structures
KW - Wave finite element
UR - http://www.scopus.com/inward/record.url?scp=85084161903&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85084161903
T3 - INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering
BT - INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering
A2 - Calvo-Manzano, Antonio
A2 - Delgado, Ana
A2 - Perez-Lopez, Antonio
A2 - Santiago, Jose Salvador
PB - SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA
T2 - 48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID
Y2 - 16 June 2019 through 19 June 2019
ER -