Locating point of impact on an anisotropic cylindrical surface using acoustic beamforming technique

Hayato Nakatani, Talieh Hajzargarbashi, Kaita Ito, Tribikram Kundu, Nobuo Takeda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Scopus citations


A beamforming array technique with four sensors is applied to a cylindrical geometry for detecting point of impact. A linear array of acoustic sensors attached to the plate record the waveforms of Lamb waves generated at the impact point with individual time delay. A beamforming technique in conjunction with an optimization scheme that incorporates the direction dependent guided Lamb wave speed in cylindrical plates is developed. The optimization is carried out using the experimentally obtained wave speed as a function of propagation direction. The maximum value in the beamforming plot corresponds to the predicted point of impact. The proposed technique is experimentally verified by comparing the predicted points with the exact points of impact on a cylindrical aluminum plate and a cylindrical composite shell. For randomly chosen points of impact the beamforming technique successfully predicts the location of the acoustic source.

Original languageEnglish (US)
Title of host publicationStructural Health Monitoring
Subtitle of host publicationResearch and Applications
PublisherTrans Tech Publications Ltd
Number of pages10
ISBN (Print)9783037857151
StatePublished - 2013
Event4th Asia-Pacific Workshop on Structural Health Monitoring - Melbourne, VIC, Australia
Duration: Dec 5 2012Dec 7 2012

Publication series

NameKey Engineering Materials
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795


Other4th Asia-Pacific Workshop on Structural Health Monitoring
CityMelbourne, VIC


  • Beamforming
  • Composite
  • Cylindrical surface
  • Guided wave
  • Impact
  • Optimization

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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