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Dr Vaclav Ondra

Research Associate in Active Tendon Morphing Rotor Blades

Vaclav Ondra

Dr Vaclav Ondra

Research Associate in Active Tendon Morphing Rotor Blades

Member of

Research interests

Currently, I am a part of the Shape Adaptive Blades for Rotorcraft Efficiency (SABRE) project (www.sabreproject.eu) where I focus on the development of a novel concept to alter structural properties of a helicopter blade using active tendon(s). The basic idea of the concept is to incorporate a tensile member (tendon) into a helicopter blade to introduce a means of controlling the blade’s effective stiffness. This control will allow to avoid harmful resonances in different flight regimes adaptively, which will enable the helicopter to operate over a wider range of rotor speeds, thereby increasing its efficiency and decreasing its fuel burn, air pollution and noise emission. To meet the ambitious objective of the project, I utilise my background in linear and non-linear structural mechanics to design, analyse, optimise and test the tendon and its integration into a blade.  

My other research interests lie in the computational and experimental dynamics of linear and non-linear structures. In particular, I am interested in system identification which often integrates both theoretical modelling and experimental testing. The aim of system identification is not only to estimate model parameters, but also to establish (or improve) a model with no a priori knowledge of the system. In the past, I worked on detection and characterisation of structural non-linearities in the frequency domain using the Hilbert transform and artificial neural networks, and experimental non-linear modal analysis using the Hilbert-Huang transform and complex non-linear modes. I also created and commissioned an application for modal parameter application designed for experimental (linear) modal analysis.  

Keywords:

  • Computational and experimental dynamics of rotating blades with active tendon(s)
  • Non-linear system identification and signal processing
  • Detection and characterisation of structural non-linearities
  • Linear and non-linear modal analysis 

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Postal address:
Queen's Building
University Walk
Clifton
Bristol
United Kingdom
Postal address:
Bristol Composites Institute (ACCIS)
Advanced Composites Collaboration for Innovation and Science
University of Bristol
Queen's Building
University Walk
Bristol
BS8 1TR
United Kingdom