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Feedback is used to decrease the sensitivity of a system to plant uncertainty or to disturbances. This thesis is focused on the reduction of sensitivity to additive disturbances applied at the output. Systems are represented by linear multivariable frequency responses whose inputs and outputs belong to / (DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI) / Rigorous conditions under which feedback can reduce sensitivity are derived. / It is shown that given a minimum phase single input-single output plant, there exists a feedback compensator which reduces sensitivity below any arbitrarily positive value on any finite frequency interval while not exceeding a specified upper bound in the right half complex plane. / It is also shown that given a multivariable invertible plant which approaches diagonal dominance at high frequencies, it is possible to build a diagonal feedback compensator to reduce the sensitivity below any arbitrarily value on any finite frequency interval while not exceeding a specified upper bound in the right half complex plane. / A relationship between sensitivity reduction and decentralized control is established. It is shown that reducing sensitivity to additive disturbances at the outputs is in essence the same as achieving local control of a multivariable system.

Automatic control of processes is a field that has evolved extensively over theyears to reduce downtime, improve quality and increase the productivity ofprocesses in manufacturing industries. ÅF Consult is a consult organization thatprovides industrial solutions worldwide. In order to test equipment andintroduce employees and students to control systems, a PLC based lab station isnecessary. The methodology used in the project is based on a literature study,followed by the solution approach and finally an evaluation. A DistributedControl System setup using a Siemens S7-300 and a Siemens S7-400 PLC hasbeen developed. The PLCs communicate using PROFIBUS DP. The station isdivided into two major parts: a conveyor belt with transportation functionalityand a robotic arm with pick-and-place functionality. The station is providedwith equipment similar to systems currently used in paper and pulp industries.Existing solutions for unloading of paper reels in the paper and pulp industriesare non-universal due to extra equipment like pre-installed rails in trailers. Anautomated solution for unloading using a robotic arm is therefore presented,designed to reduce paper reel handling and to have the possibility to unload toany trailer. The lab station is implemented according to ÅF Consults demandsof a portable, field related station. The low budget resulted in cheap equipmentthat lack accuracy, mainly resulting in issues relating to the ability to control therobotic arm properly. The unloading solution is emulated as a lab task on thestation, showing that a control setup similar to the lab station would be a goodapproach for a real implementation solution.

Thesis (Ph.D.). / Written for the Dept. of Electrical and Computer Engineering. Title from title page of PDF (viewed 2008/02/12). Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 1997. / Vita. Includes bibliographical references (leaves [93]-95).

Thesis (M.S.)--Rochester Institute of Technology, 1990. / Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 160-164).

Thesis (M.S.)--University of Wisconsin--Madison, 1961. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 97-98).

Thesis (Ph.D)--Aerospace Engineering, Georgia Institute of Technology, 2010. / Committee Chair: Mavris, Dimitri; Committee Member: German, Brian; Committee Member: Healy, Tim; Committee Member: Rosson, Randy; Committee Member: Tai, Jimmy. Part of the SMARTech Electronic Thesis and Dissertation Collection.