Controlled Space Radiation concept for mesh-free semi-analytical technique to model wave fields in complex geometries

Sourav Banerjee, Samik Das, Tribikram Kundu, Dominique Placko

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Numerical modelling of the ultrasonic wave propagation is important for Structural Heath Monitoring and System Prognosis problems. In order to develop intelligent and adaptive structures with embedded damage detector and classifier mechanisms, detailed understanding of scattered wave fields due to anomaly in the structure is inevitably required. A detailed understanding of the problem demands a good modelling of the wave propagation in the problem geometry in virtual form. Therefore, efficient analytical, semi-analytical or numerical modelling techniques are required. In recent years a semi-analytical mesh-free technique called Distributed Point Source Method (DPSM) is being used for modelling various ultrasonic, electrostatic and electromagnetic wave field problems. In the conventional DPSM approach point sources are placed along the transducer faces, problem boundaries and interfaces to model incident and scattered fields. Every point source emits energy in all directions uniformly. Source strengths of these 360° radiation sources are obtained by satisfying interface and boundary conditions of the problem. In conventional DPSM modelling approach it is assumed that the shadow zone does not require any special consideration. 360° Radiation point sources should be capable of properly modelling shadow zones because all boundary and interface conditions are satisfied. In this paper it is investigated how good this assumption is by introducing the 'shadow zone' concept at the point source level and comparing the results generated by the conventional DPSM and by this modified approach where the conventional 360° radiation point sources are replaced by the Controlled Space Radiation (CSR) sources.

Original languageEnglish (US)
Pages (from-to)615-622
Number of pages8
JournalUltrasonics
Volume49
Issue number8
DOIs
StatePublished - Dec 1 2009

Keywords

  • CSR
  • Controlled Space Radiation
  • DPSM
  • Distributed Point Source Method
  • Numerical modelling
  • Transducer Radiation Modelling
  • Ultrasonic Field Modelling

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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