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Vibration Isolation

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Vibration Control of Active Structures

Part of the book series: Solid Mechanics and Its Applications ((SMIA,volume 246))

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Abstract

This chapter addresses the problem of vibration isolation; the excitation may be harmonic or wide band. The chapter begins with the single-axis passive isolation: linear viscous isolator and relaxation isolator; an electromagnetic realization of the relaxation isolator is discussed. Next, the active isolation is considered: the celebrated single-axis sky-hook damper and its Integral Force Feedback (IFF) implementation. The difference between the two implementations when applied to flexible structures is highlighted, and the superiority (due to built-in stability properties) of the IFF is pointed out. Next, after a brief discussion of the payload isolation in spacecraft, the six-axis isolation is considered with a Gough–Stewart platform; the passive isolation when the legs consist of relaxation isolators and the active isolation when the legs are controlled according to the IFF are discussed and compared. The influence of the modal spread on performance is analyzed, as well as the parasitic stiffness of the spherical joints of the Stewart platform. Finally, a quarter-car model of a vehicle suspension is briefly analyzed. The chapter concludes with a short list of references and a set of problems.

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Notes

  1. 1.

    In feedforward control, it is not necessary to measure directly the disturbance force, but rather a signal which is correlated to it, such as the rotation velocity, if the disturbance results from a rotating unbalance.

  2. 2.

    The future James Webb Space Telescope, JWST, will involve two isolation layers: (i) the wheel isolator supporting six reaction wheels, with corner frequencies at 7 Hz for rocking and 12 Hz for translation; and (ii) a 1 Hz passive isolator at the interface between the telescope deployment tower and the spacecraft bus [3].

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Authors and Affiliations

  1. Active Structures Laboratory, Université Libre de Bruxelles, Brussels, Belgium

    André Preumont

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  1. André Preumont
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Correspondence to André Preumont .

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Preumont, A. (2018). Vibration Isolation. In: Vibration Control of Active Structures. Solid Mechanics and Its Applications, vol 246. Springer, Cham. https://doi.org/10.1007/978-3-319-72296-2_8

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  • DOI: https://doi.org/10.1007/978-3-319-72296-2_8

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-72295-5

  • Online ISBN: 978-3-319-72296-2

  • eBook Packages: EngineeringEngineering (R0)

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