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closeRadius... of curvature
Posted by ldellapietra on 29 Nov 2018 at 12:29 GMT
The authors state:
"During the peacock’s display, typical female-male distances, R = 1.0 to 1.5 m, are equal to the typical peacock train radius, which plays the role of source size A. Female therefore experience train-rattling sound in the acoustic flow near-field" ...
The peacock-peahen distance is also quite close to the train RADIUS OF CURVATURE. The typical rattling sound frequency, even if in the near-field condition, can experience a significant amplitude enhancement around the center point of the train curvature, where the peahen is situated.
Probably the extremities of the feathers contribute less to the effect, or experience a delay in the vibration phase compared to the part of the feather close to the peacock. A finite elements simulation, taking into account both the effective curvature and the feathers elasticity/rigidity along their longitudinal position could show the magnitude of the effect.