Abstract
The isolation of vibration through a system with multiple active
mounts is discussed, in which each of the mounts can transmit
vibration in several degrees of freedom. Theoretical models of the
various parts of this system have been developed which include a
flexible receiving structure and distributed active mounts, and
these models can be connected together to produce an overall
theoretical description of a realistic active isolation system.
Total transmitted power has been found to be an excellent
criterion to quantify the effect of various control strategies in
this model in which the contributions to the transmitted power in
the various degrees of freedom can be clearly understood. It has
also been found, however, that an active control system which
minimises a practical estimate of transmitted power, calculated
from the product of the axial forces and velocities under the
mounts, can give a very poor performance in terms of reducing the
total transmitted power, and can even increase it under some
circumstances. Such a control system was also found to be very
sensitive to measurement errors and the presence of flanking
paths, which give rise to the phenomena of 'power circulation'. A
more practical control strategy appears to be to minimise the
weighted sum of squared forces and velocities below the mounts,
which gives near-optimal performance in simulations. These
theoretical results are supported by experiments with a real-time
control system. The actuator and sensor requirements of such an
active vibration control system are also discussed.
Original language | English |
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Title of host publication | Proceedings of the 1997 International Symposium on Active Control of Sound and Vibration |
Place of Publication | Budapest |
Publisher | Scientific Society of Optics, Acoustics, Motion Pictures and Theater Technology, Publishing Companry of Technical University of Budapest |
Publication date | 1997 |
Pages | 93-104 |
Publication status | Published - 1997 |
Event | Active 97 - Budapest, Hungary Duration: 21 Aug 1997 → 23 Aug 1997 http://oldweb.mit.bme.hu/events/active97/c4papers.html |
Conference
Conference | Active 97 |
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Country/Territory | Hungary |
City | Budapest |
Period | 21/08/1997 → 23/08/1997 |
Internet address |