TY - GEN
T1 - Theoretical model for the prediction of sound radiated from unbaffled long enclosure with ground effect
AU - Yang, Weiping
AU - Choy, Yatsze
N1 - Funding Information:
The authors would like to acknowledge the funding support from The Hong Kong Polytechnic University (PolyU152029/17E) and (PolyU152666/16E). The first author would also like to thank the studentship of The Hong Kong Polytechnic University.
Publisher Copyright:
© 2019 Proceedings of the International Congress on Acoustics. All rights reserved.
PY - 2019
Y1 - 2019
N2 - A theoretical model is presented for the prediction of sound radiated from an unbaffled long enclosure with ground effect. This geometrical arrangement forms an idealized representation of traffic facilities such as tunnels and railway stations where sound propagates along the enclosures and radiates to the outside through the openings at both ends. The sound fields inside and outside the enclosures should be accurately predicted and thoroughly analyzed so as to determine an appropriate noise control strategy. In this paper, the Fourier transform technique and the mode matching method are firstly applied to transform the intractable boundary value problem into a scalar modified Wiener-Hopf equation. The solution of which contains infinitely many unknowns satisfying infinite linear algebraic equations susceptible to numerical treatment. Good agreement is found between the solutions obtained by the finite element method (FEM) and the proposed technique in a wide frequency range. Then, the far-field directivity patterns of the outside acoustic fields are emphatically illustrated and the formation mechanisms of lobes, zeros and the after radiation are discussed in details. In the end, the advantages and the application prospects of the proposed method are summarized.
AB - A theoretical model is presented for the prediction of sound radiated from an unbaffled long enclosure with ground effect. This geometrical arrangement forms an idealized representation of traffic facilities such as tunnels and railway stations where sound propagates along the enclosures and radiates to the outside through the openings at both ends. The sound fields inside and outside the enclosures should be accurately predicted and thoroughly analyzed so as to determine an appropriate noise control strategy. In this paper, the Fourier transform technique and the mode matching method are firstly applied to transform the intractable boundary value problem into a scalar modified Wiener-Hopf equation. The solution of which contains infinitely many unknowns satisfying infinite linear algebraic equations susceptible to numerical treatment. Good agreement is found between the solutions obtained by the finite element method (FEM) and the proposed technique in a wide frequency range. Then, the far-field directivity patterns of the outside acoustic fields are emphatically illustrated and the formation mechanisms of lobes, zeros and the after radiation are discussed in details. In the end, the advantages and the application prospects of the proposed method are summarized.
KW - Sound radiation
KW - Unbaffled long enclosure
KW - Wiener-Hopf technique
UR - http://www.scopus.com/inward/record.url?scp=85099330778&partnerID=8YFLogxK
U2 - 10.18154/RWTH-CONV-238866
DO - 10.18154/RWTH-CONV-238866
M3 - Conference article published in proceeding or book
AN - SCOPUS:85099330778
T3 - Proceedings of the International Congress on Acoustics
SP - 2057
EP - 2064
BT - Proceedings of the 23rd International Congress on Acoustics
A2 - Ochmann, Martin
A2 - Michael, Vorlander
A2 - Fels, Janina
PB - International Commission for Acoustics (ICA)
T2 - 23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019
Y2 - 9 September 2019 through 23 September 2019
ER -