Please use this identifier to cite or link to this item: https://knowledgecommons.lakeheadu.ca/handle/2453/3225
Full metadata record
DC FieldValueLanguage
dc.contributor.advisorLiu, Kefu
dc.contributor.authorDeng, Liyan
dc.date.accessioned2017-06-07T20:09:22Z
dc.date.available2017-06-07T20:09:22Z
dc.date.created2002
dc.date.issued2002
dc.identifier.urihttp://knowledgecommons.lakeheadu.ca/handle/2453/3225
dc.description.abstractAn axially-moving cantilever beam is used to study identification o f time-varying systems. A circuitry for DC motor current control and sensor conditioning is built. The circuitry meets the design requirement of controlling the axial motion of the beam and amplifying the sensor signals. A linear time-varying model governing lateral vibration of the beam is developed. Computer simulation is conducted to study the dynamic properties of the system, such as transient responses, varying state transition matrices, “frozen” modal parameters, “pseudo” modal parameters, etc. A previously developed algorithm is applied to identify the system. Two identification tasks are carried out. The system identification determines the discrete-time state space model o f the system. The modal parameter identification determines the “pseudo” modal parameters of the system. In both cases, an ensemble of freely vibrating responses are used. The study addresses several critical issues encountered in the experiment such as excitation, data preprocessing, the beam motion control, etc. The study also investigates several important factors that affect the accuracy of identification, such as the number of necessary experiments, model order, the block row number, etc. An algorithm based on the moving-average method is developed to select the “pseudo” natural frequencies of vibratory modes. The study shows that the algorithm is capable of estimating the “pseudo” natural frequencies of the vibratory modes, present in responses, while it fails to give good estimates for the “pseudo” damping ratios.
dc.language.isoen_US
dc.subjectAutomatic control
dc.subjectVibration
dc.titleModeling and identification of an axially-moving cantilever beam
dc.typeThesis
etd.degree.nameMaster of Science
etd.degree.levelMaster
etd.degree.disciplineEngineering
etd.degree.grantorLakehead University
dc.contributor.committeememberSedov, A.
Appears in Collections:Retrospective theses

Files in This Item:
File Description SizeFormat 
DengL2002m-1b.pdf5.42 MBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.