Adaptive Control Methods for Non-Linear Self-Excited Systems

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dc.contributor.authorVaudrey, Michael Allenen
dc.contributor.committeechairSaunders, William R.en
dc.contributor.committeememberBaumann, William T.en
dc.contributor.committeememberRobertshaw, Harry H.en
dc.contributor.committeememberLeo, Donald J.en
dc.contributor.committeememberVandsburger, Urien
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:15:58Zen
dc.date.adate2001-09-10en
dc.date.available2014-03-14T20:15:58Zen
dc.date.issued2001-08-28en
dc.date.rdate2002-09-10en
dc.date.sdate2001-09-07en
dc.description.abstractSelf-excited systems are open loop unstable plants having a nonlinearity that prevents an exponentially increasing time response. The resulting limit cycle is induced by any slight disturbance that causes the response of the system to grow to the saturation level of the nonlinearity. Because there is no external disturbance, control of these self-excited systems requires that the open loop system dynamics are altered so that any unstable open loop poles are stabilized in the closed loop. This work examines a variety of adaptive control approaches for controlling a thermoacoustic instability, a physical self-excited system. Initially, a static feedback controller loopshaping design and associated system identification method is presented. This design approach is shown to effectively stabilize an unstable Rijke tube combustor while preventing the creation of additional controller induced instabilities. The loopshaping design method is then used in conjunction with a trained artificial neural network to demonstrate stabilizing control in the presence of changing plant dynamics over a wide variety of operating conditions. However, because the ANN is designed specifically for a single combustor/actuator arrangement, its limited portability is a distinct disadvantage. Filtered-X least mean squares (LMS) adaptive feedback control approaches are examined when applied to both stable and unstable plants. An identification method for approximating the relevant plant dynamics to be modeled is proposed and shown to effectively stabilize the self-excited system in simulations and experiments. The adaptive feedback controller is further analyzed for robust performance when applied to the stable, disturbance rejection control problem. It is shown that robust stability cannot be guaranteed because arbitrarily small errors in the plant model can generate gradient divergence and unstable feedback loops. Finally, a time-averaged-gradient (TAG) algorithm is investigated for use in controlling self-excited systems such as the thermoacoustic instability. The TAG algorithm is shown to be very effective in stabilizing the unstable dynamics using a variety of controller parameterizations, without the need for plant estimation information from the system to be controlled.en
dc.description.degreePh. D.en
dc.identifier.otheretd-09072001-130418en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09072001-130418/en
dc.identifier.urihttp://hdl.handle.net/10919/28884en
dc.publisherVirginia Techen
dc.relation.haspartMAV_ETD_09_01.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcombustion controlen
dc.subjectthermoacoustic instabilityen
dc.subjecttime averaged gradienten
dc.subjectleast mean square algorithmsen
dc.subjectneural networken
dc.subjectadaptive feedbacken
dc.titleAdaptive Control Methods for Non-Linear Self-Excited Systemsen
dc.typeDissertationen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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