Harmonic control of a ‘smart spring’ machinery vibration isolation system

A major problem for isolating vibration from large marine machinery rafts is how best to deal with excited resonances. These generate large forces on the hull that create a significant vibration problem. The passive design of such mounts typically represents a compromise between providing good vibra...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part M, Journal of engineering for the maritime environment Journal of engineering for the maritime environment, 2008-01, Vol.222 (2), p.109-119
Main Authors: Daley, S, Zazas, I, Hatonen, J
Format: Article
Language:English
Subjects:
Active control
Controllers
Convergence
Harmonic control
Hybrid systems
Machinery
Naval engineering
Oceans
Optimization algorithms
Rafts
Rigid-body dynamics
Ships
Studies
Vibration
Vibration control
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Summary:A major problem for isolating vibration from large marine machinery rafts is how best to deal with excited resonances. These generate large forces on the hull that create a significant vibration problem. The passive design of such mounts typically represents a compromise between providing good vibration isolation and good machinery alignment under seaway motion. The ‘Smart Spring’ isolation system, a new hybrid passive—active approach to solving this problem that is being developed by BAE Systems, has been described in a series of earlier papers. The fundamental concept utilizes digitally controlled actuators to apply forces that are independent of local displacement while controlling the response of the structure's rigid body modes. The current paper describes recent work to extend the functionality of the isolation system to deal specifically with discrete-frequency vibration sources. Two novel harmonic control strategies are introduced and evaluated using a six-degrees-of-freedom experimental active mount. It is shown that a strategy that employs recursive least-squares estimation provides both exceptionally high isolation performance and rapid convergence.
ISSN:1475-0902
2041-3084
DOI:10.1243/14750902JEME88