Accession Number:

AD1053579

Title:

Bio-Inspired Methods for Producing Adaptive Beampatterns with Diffracting Baffle Shapes

Descriptive Note:

Technical Report,01 Oct 2010,30 Sep 2014

Corporate Author:

Virginia Polytechnic Institute and State University Blacksburg United States

Personal Author(s):

Report Date:

2017-01-21

Pagination or Media Count:

44.0

Abstract:

The diversity of local shape features and their role in shaping the functionalultrasonic characteristics of the noseleaves and pinnae in bats have been investigated. Using smoothing and other shape manipulation techniques, local features were changed and their acoustic impact observed. It was found that several local features of the noseleaves and pinna did have strong and consistent impacts on the beampatterns. Computer animations techniques have been used to recreate active deformations of the noseleaf shapes that some bat species show as part of their biosonar behaviors and put the resulting changes to the shapes and their acoustic characteristics into the context of the interspecific variability. Significant progress has been made towards analyzing the variability in the variability in the noseleaf shapes and in the beampatterns. For the noseleaf shapes, two approaches have been pursued. In particular, an approach based on morphing of canonical shape models has shown promising results with respect to retaining three-dimensional features of the noseleaves and a first set of eigenvectors has already been obtained. A solution to the beampattern alignment problem based on p-norm cost functions and a limited search space has been devised and tested on representative beampattern sample.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Acoustic Detection and Detectors
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE