Computational and experimental analysis of the scattering by rotating fans

The electromagnetic scattering of rotating blades is investigated both theoretically and experimentally. We have developed an analytical method based on physical optics (PO) and the method of equivalent currents (MEC), in conjunction with the quasi-stationary method. We have predicted the bistatic field scattered by a multiple skew-plated rotating fan. Comparisons with a numerical calculation based on the method of moments and with measurements have given very satisfactory results. A comparison with previously published results has also been carried out. Physical interpretations are given both in time and frequency domains. Our analytical model correctly predicts the spreading and magnitude of the frequency response as a function of the scatterer's skew angles, its rotation frequency, and the directions of incidence and scattering.

[1]  Hao Ling,et al.  ISAR image simulation of targets with moving parts using the shooting and bouncing ray technique , 1994, Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting.

[2]  G. A. Somers,et al.  Spectral characteristics of electromagnetic wave scattering by rotating propellers and its effect on clutter discrimination , 1994, Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting.

[3]  A. Michaeli.  Elimination of infinities in equivalent edge currents, part I: Fringe current components , 1986 .

[4]  J. Van Bladel,et al.  Electromagnetic fields in the presence of rotating bodies , 1976 .

[5]  D. Sengupta,et al.  Scattering of electromagnetic waves by a slowly rotating rectangular metal plate , 1979 .

[6]  Doppler effect from a transmitter in translational motion , 1979 .

[7]  Allen Taflove,et al.  A numerical technique for analyzing electromagnetic wave scattering from moving surfaces in one and two dimensions , 1989 .

[8]  Sheau-Shong Bor,et al.  Comparison of monostatic Doppler and radar cross-section spectra by rotating multiple skew-plated metal fan blades , 1992 .

[9]  Sheau-Shong Bor,et al.  Radar Cross-Sectional Spectra of Rotating Multiple Skew-Plated Metal Fan Blades by Physical Optics/Physical Theory of Diffraction, Equivalent Currents Approximation , 1992 .

[10]  G. Pelosi,et al.  A finite element approach to the electromagnetic interaction with rotating penetrable cylinders of arbitrary cross section , 1993 .

[11]  A. Michaeli.  Equivalent edge currents for arbitrary aspects of observation , 1984 .