Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems

It is now common practice to supplement a magnetic bearing with a touchdown bearing to protect the rotor and stator components. Rotor/touchdown bearing contact may arise from rotor drop, caused by power loss or emergency shutdown. This paper considers the control options that are viable when the mag...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Patrick KEOGH, Matthew COLE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	touchdown bearing rotor contact rotor rub dynamic contact conditions persistent contact Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/fe32d707b7ca469c91b8e2dfc233d5b2
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:fe32d707b7ca469c91b8e2dfc233d5b2
record_format	dspace
spelling	oai:doaj.org-article:fe32d707b7ca469c91b8e2dfc233d5b22021-11-26T07:11:27ZDynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems2187-974510.1299/mej.17-00005https://doaj.org/article/fe32d707b7ca469c91b8e2dfc233d5b22017-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_17-00005/_pdf/-char/enhttps://doaj.org/toc/2187-9745It is now common practice to supplement a magnetic bearing with a touchdown bearing to protect the rotor and stator components. Rotor/touchdown bearing contact may arise from rotor drop, caused by power loss or emergency shutdown. This paper considers the control options that are viable when the magnetic bearing is still functional should contact arise from intermittent faults or overload conditions. The problem is that bi-stable rotor responses are possible, with and without contact. If rotor contact should become persistent, the desirable course of action is to destabilize the rotor response and induce a return to contact-free levitation. In order to achieve this, it is appropriate to gain an understanding of the rotor dynamic behavior. This is determined from analytical and simulated results to reveal suitable control actions. These may be applied through the magnetic bearing control system, or by activating the touchdown bearing through a separate control loop. The issue is that standard control action for a contact-free rotor state will not be appropriate for a rotor in persistent contact since the basic plants to be controlled are significantly different. The required control action should be activated only when contact is detected. The results demonstrate that appropriately phased synchronous forcing could destabilize synchronous forward rub responses. Alternatively, small whirl motions of a touchdown bearing could also be beneficial without disturbing the main magnetic bearing control loop.Patrick KEOGHMatthew COLEThe Japan Society of Mechanical Engineersarticletouchdown bearingrotor contactrotor rubdynamic contact conditionspersistent contactMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 17-00005-17-00005 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	touchdown bearing rotor contact rotor rub dynamic contact conditions persistent contact Mechanical engineering and machinery TJ1-1570
spellingShingle	touchdown bearing rotor contact rotor rub dynamic contact conditions persistent contact Mechanical engineering and machinery TJ1-1570 Patrick KEOGH Matthew COLE Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems
description	It is now common practice to supplement a magnetic bearing with a touchdown bearing to protect the rotor and stator components. Rotor/touchdown bearing contact may arise from rotor drop, caused by power loss or emergency shutdown. This paper considers the control options that are viable when the magnetic bearing is still functional should contact arise from intermittent faults or overload conditions. The problem is that bi-stable rotor responses are possible, with and without contact. If rotor contact should become persistent, the desirable course of action is to destabilize the rotor response and induce a return to contact-free levitation. In order to achieve this, it is appropriate to gain an understanding of the rotor dynamic behavior. This is determined from analytical and simulated results to reveal suitable control actions. These may be applied through the magnetic bearing control system, or by activating the touchdown bearing through a separate control loop. The issue is that standard control action for a contact-free rotor state will not be appropriate for a rotor in persistent contact since the basic plants to be controlled are significantly different. The required control action should be activated only when contact is detected. The results demonstrate that appropriately phased synchronous forcing could destabilize synchronous forward rub responses. Alternatively, small whirl motions of a touchdown bearing could also be beneficial without disturbing the main magnetic bearing control loop.
format	article
author	Patrick KEOGH Matthew COLE
author_facet	Patrick KEOGH Matthew COLE
author_sort	Patrick KEOGH
title	Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems
title_short	Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems
title_full	Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems
title_fullStr	Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems
title_full_unstemmed	Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems
title_sort	dynamic conditions to destabilize persistent rotor/touchdown bearing contact in amb systems
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/fe32d707b7ca469c91b8e2dfc233d5b2
work_keys_str_mv	AT patrickkeogh dynamicconditionstodestabilizepersistentrotortouchdownbearingcontactinambsystems AT matthewcole dynamicconditionstodestabilizepersistentrotortouchdownbearingcontactinambsystems
_version_	1718409757812850688

Dynamic conditions to destabilize persistent Rotor/touchdown bearing contact in AMB systems

Ejemplares similares