Affiliations: Research Institute for Applied Mathematics and
Cybernetics, Nizhny Novgorod State University, 10 Uljanov St., Nizhny Novgorod
603005, Russia | Institute for Problems in Mechanics of the Russian
Academy of Sciences, 101-1 Prospect Vernadskogo, Moscow 119526, Russia | Department of Mechanical and Aerospace Engineering,
University of Virginia, 122 Engineer's Way, P.O. Box 400746, Charlottesville,
VA 22904-4746, USA
Abstract: Pre-acting control in shock/impact isolation systems is studied.
With pre-acting control, the isolation system begins to respond to an impact
before this impact has been applied to the base. The limiting performance of
the isolator with pre-acting control is investigated for a
single-degree-of-freedom system subject to an instantaneous impact. The
isolation performance index is defined as the maximum of the absolute value of
the displacement of the object to be isolated relative to the base, provided
that the magnitude of the control force transmitted to the object does not
exceed a prescribed value. It is shown that there is a substantial advantage in
the use of pre-acting isolators over isolators without pre-action. Particular
attention is given to a pre-acting isolator based on a passive elastic element
(a spring) separating the object to be protected from the base. An example
illustrates the calculation of the design parameters of such an isolator.
