Research Papers

Experimental and Analytical Investigations of Dynamic Characteristics of Magnetorheological and Nanomagnetorheological Fluid Film Journal Bearing

[+] Author and Article Information
Dimitrios A. Bompos

Machine Design Laboratory,
Department of Mechanical Engineering
and Aeronautics,
University of Patras,
Patras 26504, Greece
e-mail: dbobos@mech.upatras.gr

Pantelis G. Nikolakopoulos

Machine Design Laboratory,
Department of Mechanical Engineering
and Aeronautics,
University of Patras,
Patras 26504, Greece
e-mail: pnikolak@mech.upatras.gr

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received August 5, 2015; final manuscript received February 4, 2016; published online April 13, 2016. Assoc. Editor: John Yu.

J. Vib. Acoust 138(3), 031012 (Apr 13, 2016) (7 pages) Paper No: VIB-15-1302; doi: 10.1115/1.4032900 History: Received August 05, 2015; Revised February 04, 2016

The integrity and reliability of a rotor depend significantly on the dynamic characteristics of its bearings. Bearing design has been altered in many ways in order to achieve improvement in terms of damping and stiffness. A promising field in terms of vibration control and overall performance improvement for the journal bearings is the use of smart lubricants. Smart lubricants are fluids with controllable properties. A suitable excitation, such as an electric or a magnetic field, is used as a means of smart fluid properties control. Magnetorheological (MR) fluids consist one category of lubricants with controllable properties, thanks to magnetic particles inside the fluid volume. In this case of material, a magnetostatic field affects the apparent viscosity of the fluid by aligning the magnetic particles into chains. In this work, an MR fluid is produced. An MR fluid film bearing was constructed, which is capable of exciting the MR fluid. These bearing performances are examined experimentally and its dynamic properties are evaluated using an impact excitation method for an SAE-10 W lubricant as well as with the produced MR fluid both in its active and in its inactive state.

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Fig. 1

The concept of MR fluid journal bearing

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Fig. 2

Damping and stiffness characteristics of a journal bearing

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Fig. 3

The experimental set of Rotorkit RK-4 of Bentley Nevada mounted with the MR fluid bearing

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Fig. 4

The MR fluid journal bearing

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Fig. 5

DC power supply for the MR bearing coils

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Fig. 6

Chains of particles forming in the sides of the bearing with the magnetic field of the bearing activated. The lubricant flows freely in the sides.

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Fig. 7

Measurement of particle size distribution

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Fig. 8

The journal orbit for 250 rpm using MR fluid in its off and on state

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Fig. 9

The response of the journal motion to the activation of the magnetic field with the MR lubricant

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Fig. 10

Orbit of shaft with and without loading with (a) inactive and (b) active magnetic field, for 250 rpm and 20% by weight

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Fig. 11

Kxx stiffness coefficient for a range of journal velocities, using Newtonian, inactive, and active MR fluids

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Fig. 12

Kyy stiffness coefficient for a range of journal rotational velocity, using Newtonian active MR, and inactive MR fluids

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Fig. 13

Cxx damping coefficient for a range of journal rotational velocity, using Newtonian active MR, and inactive MR fluids

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Fig. 14

Cyy damping coefficient for a range of journal rotational velocity, using Newtonian active MR, and inactive MR fluids

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Fig. 15

Dimensional damping coefficient for a bearing with L/D = 0.8 over a range of Sommerfeld number values

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Fig. 16

Dimensional damping coefficient for a bearing using NMR fluid with L/D = 0.8 over a range of Sommerfeld number values




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