Deflection characterisation of rotary systems using ground-based radar

Francis Xavier Ochieng, Haoyang Jiang, Craig Matthew Hancock, Gethin Wyn Roberts, Julien Le Kernec, Xu Tang, Huib de Ligt

Research output: Contribution to journalArticlepeer-review

12 Downloads (Pure)


In the last two decades, an increase in large rotary machines/systems has been witnessed. To ensure safe operation of these systems especially due to extreme stress caused by centrifugal forces as well as the wind or water loadings, regular structural health monitoring (SHM) of the unbalanced parameters, particularly at the blade tips is necessary. For this, the use of non-contact sensors provides the most appropriate approach; however, millimetric out-of-plane deflection monitoring using non-contact sensors at distances >1 m has not been comprehensively addressed for rotary systems, like wind turbines. This study presents a modelling environment to simulate radar returns to analyse rotary systems. Employing Sammon mapping as a dimensionality reduction procedure in conjunction with 2D visualisation, the study demonstrates the characterisation of dynamic deflection parameters using a fast, portable ground-based interferometric radar (GBR). Comparisons between the GBR results with those of a Leica AR20 GPS indicate a divergence ±12.79 mm. The study utilises SHM framework to acquire, normalise, extract, and validate GBR signals within an SHM framework for structures under test or for deflection validation of the new system. Further, it contributes to the non-contact structural fatigue damage detection during design, testing, and operating stages of rotary structures blade tips.
Original languageEnglish
Pages (from-to)7215-7219
Number of pages5
JournalThe Journal of Engineering
Issue number20
Publication statusPublished - 1 Oct 2019


  • Deflection measurements
  • radar
  • Deformation monitoring


Dive into the research topics of 'Deflection characterisation of rotary systems using ground-based radar'. Together they form a unique fingerprint.

Cite this