Design and investigation of a new mixed-mode magnetorheological damper

Magnetorheological (MR) fluids are field-responsive material with the ability to change its rheological behavior by having an external magnetic field. Therefore, they are commonly used in vibration damping, clutches, actuators and haptic devices. Generally, MR devices are fabricated utilizing the op...

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Main Author:	Mohd. Yazid, Izyan Iryani
Format:	Thesis
Language:	English
Published:	2016
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/78736/1/IzyanIryaniMohdPMJIIT2016.pdf
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id	my-utm-ep.78736
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spelling	my-utm-ep.787362018-08-30T08:06:48Z Design and investigation of a new mixed-mode magnetorheological damper 2016-07 Mohd. Yazid, Izyan Iryani T Technology (General) Magnetorheological (MR) fluids are field-responsive material with the ability to change its rheological behavior by having an external magnetic field. Therefore, they are commonly used in vibration damping, clutches, actuators and haptic devices. Generally, MR devices are fabricated utilizing the operational mechanism of a single working mode which is either flow, shear or squeeze. However, for this study a special MR damper was designed and fabricated to carry out a dynamic loading test and analyze the effect on a hydrocarbon-based MR fluid in a combination of shear and squeeze working modes. The damping force generated by shear mode is measured based on the force-displacements relationship of applied current and piston stroke length. The cushion effect generated by the squeeze mode is evaluated by the magnitude of the damping force at various piston stroke lengths. The MR damper could produce a damping force ranging from 50 to 270 N with zero input of current, up to 0.8 A without any saturation occurring from 15 to 25 mm of the piston stroke length. However, when the piston was closing to the bottom of the cylinder from 25 to 26 mm, a high peak force was observed confirming the existence of the squeeze mode. The cushion effect started as soon as the current was applied showing a high magnitude of 722 N at only 0.2 A. As the applied current increased further to 0.8 A, a very high squeeze force up to 1030N was produced when the piston nearly reached the cylindrical end. This proves that the cushion effect induced by the squeeze mode helps strengthen the damping force and consequently brings a positive impact towards a mixed mode damper when the piston is nearly closing the gap at the bottom of the cylinder. In conclusion, a high yield stress MR damper at a small gap clearance was successfully produced and this uniqueness can be utilized as a replacement of the conventional rubber stopper in dampers. 2016-07 Thesis http://eprints.utm.my/id/eprint/78736/ http://eprints.utm.my/id/eprint/78736/1/IzyanIryaniMohdPMJIIT2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:106011 phd doctoral Universiti Teknologi Malaysia, Malaysia-Japan International Institute of Technology (MJIIT) Malaysia-Japan International Institute of Technology (MJIIT)
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	T Technology (General)
spellingShingle	T Technology (General) Mohd. Yazid, Izyan Iryani Design and investigation of a new mixed-mode magnetorheological damper
description	Magnetorheological (MR) fluids are field-responsive material with the ability to change its rheological behavior by having an external magnetic field. Therefore, they are commonly used in vibration damping, clutches, actuators and haptic devices. Generally, MR devices are fabricated utilizing the operational mechanism of a single working mode which is either flow, shear or squeeze. However, for this study a special MR damper was designed and fabricated to carry out a dynamic loading test and analyze the effect on a hydrocarbon-based MR fluid in a combination of shear and squeeze working modes. The damping force generated by shear mode is measured based on the force-displacements relationship of applied current and piston stroke length. The cushion effect generated by the squeeze mode is evaluated by the magnitude of the damping force at various piston stroke lengths. The MR damper could produce a damping force ranging from 50 to 270 N with zero input of current, up to 0.8 A without any saturation occurring from 15 to 25 mm of the piston stroke length. However, when the piston was closing to the bottom of the cylinder from 25 to 26 mm, a high peak force was observed confirming the existence of the squeeze mode. The cushion effect started as soon as the current was applied showing a high magnitude of 722 N at only 0.2 A. As the applied current increased further to 0.8 A, a very high squeeze force up to 1030N was produced when the piston nearly reached the cylindrical end. This proves that the cushion effect induced by the squeeze mode helps strengthen the damping force and consequently brings a positive impact towards a mixed mode damper when the piston is nearly closing the gap at the bottom of the cylinder. In conclusion, a high yield stress MR damper at a small gap clearance was successfully produced and this uniqueness can be utilized as a replacement of the conventional rubber stopper in dampers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd. Yazid, Izyan Iryani
author_facet	Mohd. Yazid, Izyan Iryani
author_sort	Mohd. Yazid, Izyan Iryani
title	Design and investigation of a new mixed-mode magnetorheological damper
title_short	Design and investigation of a new mixed-mode magnetorheological damper
title_full	Design and investigation of a new mixed-mode magnetorheological damper
title_fullStr	Design and investigation of a new mixed-mode magnetorheological damper
title_full_unstemmed	Design and investigation of a new mixed-mode magnetorheological damper
title_sort	design and investigation of a new mixed-mode magnetorheological damper
granting_institution	Universiti Teknologi Malaysia, Malaysia-Japan International Institute of Technology (MJIIT)
granting_department	Malaysia-Japan International Institute of Technology (MJIIT)
publishDate	2016
url	http://eprints.utm.my/id/eprint/78736/1/IzyanIryaniMohdPMJIIT2016.pdf
_version_	1747818058700816384

Design and investigation of a new mixed-mode magnetorheological damper

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