**Editors: Tore Butlin, Alan Champneys and Jim Woodhouse **

Vibration problems affect almost every engineering industry, driving a research effort that is decades old yet still expanding. But research in this field of 'nonlinear structural dynamics' has proven remarkably resistant to industrial application, and the subject landscape itself is complicated enough that experts within it do not all speak the same technical language. This theme issue is introduced by an attempt to map the landscape of nonlinear structural dynamics. The subsequent technical papers touch on a significant portion of this map, with contributions from both industrial and academic perspectives. This theme issue aims to provide a first guide to industry when faced with complex vibration phenomena, and as an academic resource for connecting the islands inhabited by different specialists within the broad field of nonlinear structural dynamics. The result is a collection of papers that simultaneously provide a ready introduction to current methods for mitigating or exploiting nonlinear phenomena; as well as a snapshot of state-of-the-art research in several particularly challenging corners of the field.

*Cover image: Images provided by Dr Coetzee, Prof Woodhouse and Dr Butlin *

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## About the Guest Editors

** Dr Tore Butlin ** carried out his PhD on ‘Prediction and sensitivity of friction-induced vibration’, funded by the EPSRC. He then went on to an industry-funded postdoctoral position investigating the dynamics and control of oilwell drilling. He is currently an RAEng / EPSRC Research Fellow at Cambridge University Engineering Department working on ‘Modelling the vibration of complex structures with localised nonlinearities’.

**Professor Alan Champneys** studied mathematics at the University of Birmingham then did his PhD work at the University of Oxford on nonlinear fluid-structure interaction. After a short spell at the University of Bath he became a lecturer in nonlinear systems for the Department of Engineering Mathematics at the University of Bristol. He is now a Professor of Applied Non-linear Mathematics. His interests are in using bifurcation analysis tools for understanding complex dynamic phenomena including aircraft dynamics, power electronics, and fluid-structure interaction. He also has an interest in localised phenomena such as the buckling of cylinders, solitary waves, and nonlinear optics.

**Professor Jim Woodhouse** studied mathematics at Cambridge as an undergraduate, then did his PhD work on the acoustics of the violin. This led to a spell in a consultancy company working in the more general area of noise and vibration, then in 1986 he joined the Cambridge University Engineering Department as a lecturer, then later a Reader and Professor. His interests are in the modelling, measurement and prediction of vibration in complex structures, including musical instruments. His interest in the violin started from a hobby interest in building instruments.