scruggseecs.umich.edu/.../control-group/fa2016_files/scruggs.pdfquestions? contact: judi jones...

Questions?Contact:JudiJonesasap@umich.edu

OptimalControlofVibratorySystemswithPowerDirectionalityConstraints

ABSTRACT:Inmanyvibrationengineeringapplications,thecontrolhardwareexhibitspowerdirectionalityconstraints.Asimpleexampleissemiactive(i.e.,controllabledamping)vibrationsuppressiontechnologyforvehiclesuspensionsandcivil structures. For these systems, energy absorption is controlled by varying the effective viscosities of controllabledashpot elements. This enables the implementation of high-bandwidth, non-colocated feedback control, but feasiblefeedback lawsareprohibitedfromdrivingpower into thevibratorysystem.Analogousmathematicalproblemsarise inmanyotherareasofvibrationengineering,andrecentlyhaveemergedasafundamentalaspectofcontrolproblemsforvibrationenergyharvestingsystems,includingsmall-scalevibrationenergyscavengers,aswellasMegawatt-scaleoceanwaveenergyconverters. Inthesetechnologies, it isoftenmoreeconomical tousepowertrainsandconvertersthatarecapable of only single-directional power transmission. This talk will discuss some of the implications of powerdirectionalityconstraints,foroptimalcontroldesign.Thepresenceoftheseconstraintscanmakesomecontrolobjectivestrivial - most notably, stability robustness. However, performance optimization can be challenging, especially forproblemsinvolvingstochasticoruncertainsystems.Anattemptwillbemadetoemphasizecommonfeaturessharedbymanyapplicationareas.Exampleswillbepresented,pertainingtopastworkinearthquakeengineering,wirelesssensing,andoceanwaveenergy.

BIO:JeffScruggsisanAssociateProfessorintheDepartmentofCivil&EnvironmentalEngineeringattheUniversityofMichigan,whichhejoinedin2011.HereceivedhisB.S.andM.S.degreesinElectricalEngineeringfromVirginiaTechin1997and1999,respectively,andhisPh.D.inAppliedMechanicsfromtheCaltechin2004.PriortojoiningtheUniversityofMichigan,heheldpostdoctoralpositionsatCaltechandtheUniversityofCalifornia,SanDiego,andwasonthefacultyatDukeUniversityfrom2007-11.Scruggs’scurrentresearchisintheareasofmechanics,vibration,energy,andcontrol.HisresearchissupportedbyNSF,ONR,andDOE.

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JeffScruggsUniversityofMichigan

DepartmentofCivilandEnvironmentalEngineering

Friday,October21,2016

3:30–4:30pm•1500EECS

Sponsoredby:Bosch,Ford,andToyota