dc.contributor.author	Mendoza, Hector	en
dc.contributor.committeechair	Kasarda, Mary E.	en
dc.contributor.committeemember	Kirk, R. Gordon	en
dc.contributor.committeemember	Wicks, Alfred L.	en
dc.contributor.department	Mechanical Engineering	en
dc.date.accessioned	2014-03-14T20:41:03Z	en
dc.date.adate	2000-07-06	en
dc.date.available	2014-03-14T20:41:03Z	en
dc.date.issued	2000-06-22	en
dc.date.rdate	2001-07-06	en
dc.date.sdate	2000-07-05	en
dc.description.abstract	Subsynchronous vibrations such as those caused by rotor instability represent one of the most harrowing scenarios of rotor vibration. They are related to a great diversity of destabilizing forces and some of them are not well understood yet. Therefore, special attention must be paid to this type of vibration. Active Magnetic Bearings (AMBs) monitor the position of the shaft and change the dynamics of the system accordingly to keep the rotor in a desired position, offering the possibility of being used as dampers for vibration control. In the present work, a single-disk and a three-disk rotor were built to evaluate the effectiveness of an Active Magnetic Damper (AMD) in damping subsynchronous vibrations. An AMD was used to inject a signal simulating a subsynchronous vibration in the rotor, as another AMD was used to perform active control. Two locations of the AMD were considered for each rotor. For the single-disk rotor, experimental data was taken with the AMD located at three-quarters of the rotor-span and with the AMD located at midspan. For the three-disk rotor, experimental data was taken with the AMD located at a quarter-span and with the AMD at two-thirds of the rotor span. An undamped critical speed and a forced response analysis were performed on the rotors in order to predict the dynamic characteristics of the rotors with and without the AMD. It was demonstrated that an AMD is effective in damping subsynchronous vibrations. The addition of an AMD introduces damping and stiffness to the rotor-bearing system resulting in a change in the synchronous response and a consequent increase of the amplitude of vibrations at synchronous frequencies. This effect must be carefully considered when designing a system with an AMD.	en
dc.description.degree	Master of Science	en
dc.identifier.other	etd-07052000-14530020	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-07052000-14530020/	en
dc.identifier.uri	http://hdl.handle.net/10919/33887	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	references.pdf	en
dc.relation.haspart	vita.pdf	en
dc.relation.haspart	chapter6.pdf	en
dc.relation.haspart	chapter5.pdf	en
dc.relation.haspart	chapter4.pdf	en
dc.relation.haspart	chapter3a.pdf	en
dc.relation.haspart	chapter3.pdf	en
dc.relation.haspart	appendixb.pdf	en
dc.relation.haspart	appendixc.pdf	en
dc.relation.haspart	frontmat.pdf	en
dc.relation.haspart	appendixa.pdf	en
dc.relation.haspart	chapter1.pdf	en
dc.relation.haspart	chapter2.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	Active Magnetic Bearing	en
dc.subject	Rotordynamics	en
dc.subject	Active Magnetic Damper	en
dc.subject	Subsynchronous vibrations	en
dc.subject	Active Control	en
dc.subject	Instability	en
dc.title	Evaluation of the Effectiveness of an Active Magnetic Damper (AMD) in Damping Subsynchronous Vibrations in a Flexible Rotor	en
dc.type	Thesis	en
thesis.degree.discipline	Mechanical Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	masters	en
thesis.degree.name	Master of Science	en

Evaluation of the Effectiveness of an Active Magnetic Damper (AMD) in Damping Subsynchronous Vibrations in a Flexible Rotor

Files

Original bundle

Collections