The scattering of sound from surfaces by rotating sources such as the tips of helicopter rotor blades can be used as a method of locating and ranging obstructions which may represent a physical danger to the craft. Modelling such systems presents some difficulties but these can be overcome using a combination of TLM and phase-coherent ray-tracing. This paper describes the hybrid approach, particularly, the techniques for interfacing. The application to the specific problem of the scattering of rotor-tip noise from realistic targets involved the use of a simple PML and surface-conforming boundaries.
|Number of pages
|International Journal of Numerical Modelling: Electronic Networks, Devices and Fields
|Published - 2001