A Bearing Application Using Magnetorheological Fluids

Agrawal, Ashish; Ciocanel, Constantin; Martinez, Tony; Vieira, S. L.; Naganathan, Nagi G.; Robb, Scott; DUGGAN, JIM

doi:10.1177/1045389x02013010010

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…So, engineers have been working on possible ways of improving static, dynamic and energy characteristics of fluid-film bearings for almost three decades, and the following directions could be highlighted in terms of means of active control: control of gap profile [2][3][4][5][6][7][8], control of supply pressure [9][10][11][12][13], control of a lubricant viscosity. Viscosity control is by far the least developed and researched direction, however quite promising in the field of magnetorheological fluids [14][15][16][17][18][19][20]. Active control of the supply pressure is the simplest way to implement the idea of maintaining a desired position of a rotor within the fluid film gap as it requires practically no mechanical reconfiguration.…”

Section: Problem Analysismentioning

confidence: 99%

Tribomechatronics as a field of study

Савин¹,

Kornaev²,

Polyakov³

et al. 2019

BALTTRIB

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The analysis of the prerequisites for the formation of a new direction of science and technology based on the synergistic combination of hydrodynamics, precision mechanics, tribotechnology, power electronics and information technology is carried out. As objects of study, various types of rotor supports, sealingings and damping devices with built-in functions of automated diagnostics and active control are considered. The conceptual, mathematical and algorithmic models of some types of controlled tribotechnical devices are presented, as well as some results of calculating thermomechanical quantities, dynamic and energy characteristics.

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Section: Problem Analysismentioning

confidence: 99%

Tribomechatronics as a field of study

Савин¹,

Kornaev²,

Polyakov³

et al. 2019

BALTTRIB

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“…Although these advantages, the researchers are striving to improve their performance to meet new requirements under different operating conditions. 3,4 Through reading literature and actual investigations, the design of new bearing concepts, 5,6 bearing geometries, 7,8 and new lubricants 9,10,11,12 are some approaches to increase performance of fluid-film bearing. Magnetorheological fluids (MRF) capable of controllable and reversible rheological properties are widely used in brakes, 13,14 medical instruments, 15,16 dampers, 17,18 sealings, 19,20 and other engineering fields.…”

Section: Introductionmentioning

confidence: 99%

Research on control strategy of an active magnetorheological fluid bearing based on improved gray wolf optimization approach

Lai

Hua

Liu

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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In order to address the problems of insufficient load capacity and rotor vibration, an active fluid-film bearing lubricated with magnetorheological fluid (MRF) is proposed. First, the geometry of the MRF fluid-film bearing is designed and its intelligent lubrication mechanism is analyzed to clarify its advantages. In addition, mathematical model of MRF fluid-film bearing-rotor system is derived, and FEM model is utilized to obtain stiffness and damping coefficients to supplement mathematical model. Moreover, an improved gray wolf optimization (IGWO) algorithm is developed to tune the PID controller parameters. The validity of the proposed method is verified by numerical simulation. Furthermore, the simulation results show that with the increasing of current magnitude, the orbits of shaft center decrease. Under the presence of magnetic fields, the shaft center orbits of the MRF bearing can converge to a point, and therefore this bearing has ability to suppress rotor vibration. Finally, IGWO-PID controller has better response characteristics than GWO, PSO, and GA algorithms, and hence the IGWO algorithm can find the more appropriate PID controller parameters, that the validity of the improved algorithm is further proved. Therefore, the active bearing and its research findings provide new reference for MRF vibration control in the field of journal bearing lubrication.

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“…Over the past decades, magnetorheological (MR) fluids and electrorheological (ER) fluids have been implemented in many vibration-related engineering applications due to their unique properties. MR fluids are made of micron-sized iron particles that are suspended in a carrier liquid such as mineral oil, synthetic oil, water, or glycol [7]. ER fluids are suspensions of nonconducting microparticles in an electrically insulating fluid.…”

Section: Introductionmentioning

confidence: 99%

MR- and ER-Based Semiactive Engine Mounts: A Review

Elahinia

Ciocanel

Wang³

2013

Smart Materials Research

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Hybrid propulsion technologies, including hybrid electric and hydraulic hybrid, equip vehicles with nonconventional power sources (in addition to the internal combustion engine) to provide higher fuel efficiency. However, these technologies tend to lead to higher levels of noise, vibration, and harshness in the vehicles, mainly due to the switching between the multiple power sources involved. In addition, the shocks and vibrations associated with the power sources switching may occur over a wide range of frequencies. It has been proven that passive vibration isolators (e.g., elastomeric and hydraulic mounts) are unable to mitigate or totally isolate such shocks and vibrations. Active mounts, while effective, are more complex, require significant power to operate, and can lead to system instabilities. Semiactive vibration isolators have been shown to be as effective as active mounts while being less complex and requiring less power to operate. This paper presents a review of novel semiactive shock and vibration isolators developed using magnetorheological and electrorheological fluids. These fluids change their yield stress in response to an externally applied magnetic and electric field, respectively. As a result, these fluids allow one to transform a passive hydraulic vibration isolator into a semiactive device.

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A Bearing Application Using Magnetorheological Fluids

Cited by 9 publications

References 1 publication

Tribomechatronics as a field of study

Tribomechatronics as a field of study

Research on control strategy of an active magnetorheological fluid bearing based on improved gray wolf optimization approach

MR- and ER-Based Semiactive Engine Mounts: A Review

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