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- Title
Location Optimization of Monopole Equivalent Sources in Wave Superposition Method.
- Authors
Shaowei Wu; Yang Xiang
- Abstract
In wave superposition method, the prediction accuracy of acoustic pressure heavily depends on the locations of equivalent sources. In this paper, the prediction accuracy corresponding to monopole equivalent source is studied. According to analysis in this paper, when the velocities on some boundary nodes are inversely calculated using the predicted pressures, there is velocity reconstruction error, and the prediction error of the acoustic pressure and the velocity reconstruction error are closely related. The relationship between them is theoretically derived and indicates that the prediction error decreases with a decrease in velocity reconstruction error. Based on these findings, a method to determine the optimal locations by minimizing the normalized velocity reconstruction error is proposed. A frequency threshold criterion is devised to give the frequency range for certain number of equivalent sources within which good prediction accuracy of the acoustic pressure can be obtained. The proposed method is validated by simulation and experiment, respectively. The results show that the method significantly reduces prediction errors and is feasible.
- Subjects
SUPERPOSITION (Optics); FREQUENCY (Linguistics); DEFORMATIONS (Mechanics); FINITE element method; ACOUSTIC Electronics (Music)
- Publication
International Journal of Acoustics & Vibration, 2018, Vol 23, Issue 2, p254
- ISSN
1027-5851
- Publication type
Article
- DOI
10.20855/ijav.2018.23.21467