Details of Grant 

EPSRC Reference:	GR/R43563/01
Title:	Inverse methods for vibration suppression using structural modifications
Principal Investigator:	Mottershead, Professor J
Other Investigators:	Ouyang, Professor H
Researcher Co-Investigators:
Project Partners:	Westland
Department:	School of Engineering
Organisation:	University of Liverpool
Scheme:	Standard Research (Pre-FEC)
Starts:	01 October 2001	Ends:	30 September 2004	Value (£):	208,546
EPSRC Research Topic Classifications:	Materials testing & eng.
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:
Panel History:
Summary on Grant Application Form
Inverse methods will be applied for vibration suppression by pole/zero assignment using measured receptances. The assignment of poles and zeros will be achieved by passive modifications to the structure. It is important that finite element models are not used because they include assumptions and approximations. The principles of the technique have been established and proven in preliminary experiments. The method allows the assignment of poles and zeros in both point and cross receptances. The assignment of zeros is of particular interest to many engineering problems because vibration disappears at the frequency and coordinate of a zero - zeros generally occur at different frequencies in different receptances. The dynamic vibration absorber is the traditional method but can only produce a zero in a point receptance at the coordinate where the secondary system is attached. The new method allows a zero to be assigned at a differend coordinate to the modification and can therefore be applied to problems of limited access. In the research programmme the method will be developed so that realistic modifications such as the stiffening of a plate-structure with a beam can be achieved whilst several poles and zeros are assigned under mixed constraints. The method will be validated rigorously on two difficult test structures: the NASTRAN tower and part of a helicopter airframe.
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Organisation Website:	http://www.liv.ac.uk