No description available.

Active magnetic bearing (AMB) is an ideal bearing solution for high performance and energy efficient applications. Proper operation of AMB can be achieved only with advanced feedback control techniques. An identified system model is required for synthesizing high performance model based controllers. System identification is the preferred method for obtaining an accurate model. Therefore, it becomes a prerequisite for the commissioning of AMB. System identification for commissioning poses some challenges and special requirements. In this thesis, system identification of AMB is approached within the context of commissioning. A procedure for identification is developed and applied to experimental data from a prototype AMB system. The identification procedure is based on the so called prediction error method, and it has been performed in the frequency domain. A linear state-space model, along with the required parameters, is successfully identified.

In this thesis we consider linear multivariable frequency response systems with finite numbers of unstable poles but with no poles on the j(omega) - axis. We represent unstable systems by input-output mappings with restricted domains in / (DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI) / The effects of unstable perturbations in an open loop system K on the closed loop system (I + K)('-1) are studied. For this purpose the gap metric is introduced for measuring approximations to unstable systems. This metric is used to determine the sets of "allowable" uncertainties, i.e., those which do not destroy the stability of a feedback system, and which preserve a specified tolerance on the closed loop input-output behavior. / It is shown that the allowable sets of uncertainties consist of closed operators which are contained in spheres sufficiently small in the gap metric. Also, all metrics which separate allowable uncertainties from the others are shown to generate the same topology as the gap. / It is shown that all admissible approximations to a nominal frequency response system have domains with the same codimension, and therefore the same number of r.h.p. poles as the nominal system. / Various estimates of the gap between two unstable systems are obtained, and applied to examples.

Thesis (M.S.)--Montana State University--Bozeman, 2004. / Typescript. Chairperson, Graduate Committee: Todd J. Kaiser. Includes bibliographical references (leaves 76-78).

Thesis (M.E. Sc.)--Dept. of Electrical and Electronic Engineering, University of Adelaide, 1990. / Typescript (Photocopy). Includes bibliographical references (leaves 263-269).

Thesis (M.S.)--Ohio University, March, 1994. / Title from PDF t.p.

Thesis (Ph. D.)--Florida State University, 2005. / Advisors: Dr. Emmanuel G. Collins Jr., and Dr. Farruk S. Alvi, FAMU-FSU College of Engineering, Dept. of Mechanical Engineering. Title and description from dissertation home page (viewed June 15, 2005). Document formatted into pages; contains xvii, 185 pages. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1961. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 62).

Thesis (M.S.)--University of Wisconsin--Madison, 1962. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 81-85).

Thesis (M.S.)--University of Wisconsin--Madison, 1962. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 86).