Nr. Harland et al., Adaptive-passive control of vibration transmission in beams using electro/magnetorheological fluid filled inserts, IEEE CON SY, 9(2), 2001, pp. 209-220
A method for the control of the transmission of bending vibrations in beams
is described. A composite beam (a structural insert) is inserted into a pa
rt of the structure to affect the transmission there. The insert comprises
two elastic face plates and a central core of tunable fluid such as an elec
trorheological (ER) or magnteorheological (MR) fluid, By adjusting the appl
ied electric or magnetic field the rheological properties of the fluid can
be controlled and hence so too can the vibration transmission properties of
the insert, Theoretical results concerning the transmission of vibrations
in beam-like structures are reviewed. Numerical results are presented for t
he transmission through ER and MR fluid filled inserts, with experimental r
esults for an ER case, The transmission is seen to show a pass/stopband str
ucture with the stopbands being tunable.