Comparison of calculation methods of sound radiation by complex bodies
- Research Area:
- Numerical Acoustics,
- Type of Thesis:
Master Thesis of Bechtel, Philipp
The efficient simulation of the acoustic sound radiation of a body is important. Currently, the most used numerical modeling approach is the acoustic boundary element method (BEM). Although, this method provides realistic results, it requires a significant modelling effort and long computation times. The present thesis uses a reference body to compare three analytical approaches to the boundary element method. Both the calculated sound signals at fixed viewing points and the required calculation times are examined. It can be shown that the multipole auralization can predict similar sound signals with a fraction of the computing time. Further investigations are carried out to determine the degrees of freedom of the multipole decomposition and synthesis. Independent approaches are developed, for the determination of the regularization parameter and the maximum order body. A similarity assessment is achieved by using the psychoacoustic quantities of the time variant loudness and sharpness.. Furthermore, it can be shown that a separated auralization of a complex body with a subsequent superposition using monopole and multipole auralization is not only possible but also a sensible approach.