Professor David J. Ewins FREng, FCGI, FIMechE
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DSc(Eng) (Univ. London 1983); PhD (Univ Cambridge, 1967); BSc(Eng) Univ London (1963). Currently, Professor of Vibration Engineering at Imperial College, London since 1983; Director of Centre of Vibration Engineering since 1990, and former Director of the Rolls-Royce University Technology Centre (UTC) for Vibration at Imperial College (1990-2003). Also, from 1999-2002, 1st Temasek Professor and Director of the Centre for the Mechanics of Micro-Systems (CMMS) at Nanyang Technological University, Singapore.
Elected to the Royal Academy of Engineers in 1995; Fellow of the Institution of Mechanical Engineers, UK (1990); Fellow of the City & Guilds of London Institute (2001); Member of ASME (1982), SEM (1987). Recipient of Society of Experimental Mechanics’ D J DeMichele Award, 1993, and M M Frocht Award, 2002, and the Swedish Vibration Society’s ‘Golden Accelerometer’ Award, 2001. Founding Chairman of the Dynamic Testing Agency (UK, 1990). Author of "Modal Testing: Theory & Practice" first edition, 1984; 9th reprint 1996; second edition, 2000. Co- editor of "Encyclopedia of Vibration" (2001); contributor to 3 books; author and co-author of over 250 technical papers on vibration-related topics. Organiser of SD2000, a Workshop on the Future directions in Structural Dynamics, Los Alamos, 1999. Editor (with D J Inman) of “Structural Dynamics@2000”. Partner, ICATS (founded 1989). Author and principal presenter of over 100 short courses on Modal Testing in 20 countries. Supervisor of more than 40 PhD graduates.
Research Interests cover a wide range of Structural Dynamics topics and focus on (i) Modal Testing and (ii) Rotating Machinery dynamics. Has worked in vibration of turbomachinery components- especially bladed discs - for over 40 years, including the first PhD in blade mistuning.
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Title of Keynote Lecture
The Role of Modal Testing and Analysis in the Non-linear and Unstable World of Rotating Machinery Dynamics
Modal testing and analysis are widely used to study the dynamic behaviour of complex practical structures and it is natural that they should be applied to rotating machinery. However, machinery structures tend to present greater challenges, not only from their rotation, but also from a greater incidence of non-linearity and, frequently, of instability. Modal methods are essentially linear methods and so their application to rotating machinery requires some care. Nevertheless, as discussed in this paper, significant insights into the complicated behaviour of many rotating machines can be gained using suitably adapted modal testing methods. Examples of measurements on highly-nonlinear structures (which do not possess modes in the classical sense), and of unstable systems, and of unstable non-linear systems, will be presented and their significance and meaning explained on a physical basis.
Address of Keynote Speaker
Professor D.J. Ewins DSc(Eng), FREng
Professor Vibration Engineering
Room 562, Mechanical Engineering
Imperial College
Exhibition Road
London SW7 2AZ
United Kingdom
Tel: +44 (0)207 594 7068
Fax: +44 (0)207 584 1560
Email: n.hancock@imperial.ac.uk
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