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Research Papers: Coatings and Solid Lubricants

Experimental Studies on Foil Bearing With a Sliding Coating Made of Synthetic Material

[+] Author and Article Information
Grzegorz Zywica

Mem. ASME
Head of the Turbines Dynamics
and Diagnostics Department
Institute of Fluid-Flow Machinery,
Polish Academy of Sciences,
Fiszera 14 Street,
Gdansk 80-231, Poland
e-mail: gzywica@imp.gda.pl

Pawel Baginski

Institute of Fluid-Flow Machinery,
Polish Academy of Sciences,
Fiszera 14 Street,
Gdansk 80-231, Poland
e-mail: pbaginski@imp.gda.pl

Slawomir Banaszek

Institute of Fluid-Flow Machinery,
Polish Academy of Sciences,
Fiszera 14 Street,
Gdansk 80-231, Poland
e-mail: slawomir.banaszek@imp.gda.pl

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 23, 2014; final manuscript received June 22, 2015; published online September 22, 2015. Assoc. Editor: Satish V. Kailas.

J. Tribol 138(1), 011301 (Sep 22, 2015) (10 pages) Paper No: TRIB-14-1313; doi: 10.1115/1.4031396 History: Received December 23, 2014; Revised June 22, 2015

The paper discusses the research on foil bearings with antifriction coating manufactured from synthetic materials. The tests were carried out on a special test stand of our own construction, designed with the use of numerical analysis. In the course of the experimental studies, the test stand was set up in two configurations: with one or two foil bearings. The measurements were done, which focused on temperature distributions with the aid of thermocouples and thermovision camera. The measurements were being performed under varying conditions of bearing operation. The conducted experiments permitted to verify the durability, thermal characteristics, and dynamic performance of foil bearings in different configurations. An original method to measure temperature of a top foil has been worked out.

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Figures

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Fig. 1

Three-dimensional model of the foil bearing test stand

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Fig. 2

The test rig with two bearing supports and the shaft without disk

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Fig. 3

The way of mounting the measurement sensors on the test rig: (a) accelerometers and eddy current sensors and (b) thermocouples

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Fig. 4

Geometry of tested foil bearing: (a)—parts of the bearing and (b) dimensions of the bump foil before final forming

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Fig. 5

Friction torque diagram depending on the rotational speed in tested foil bearing [31]

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Fig. 6

Top foil abrasive damage caused by measuring elements

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Fig. 7

The way of thermocouples delivering to the top foil

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Fig. 8

Distribution of measurement points along the circumference of the foil bearing

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Fig. 9

The temperature of top foil measured during wearing-in process

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Fig. 10

The test stand with a free foil bearing after removing the support

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Fig. 11

Graph of top foil temperature measured in various bearing parts, during the study of the bearing with a free bush for different rotational speeds

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Fig. 12

The temperature distribution on the top edge of the foil in the visible part of heated journal during bearing operation (photo taken from the right side)

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Fig. 13

The temperature distribution on the top edge of the foil in the visible part of heated journal during bearing operation (photo taken from the left side)

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Fig. 14

The temperature distribution on the top edge of the foil in the visible part of heated journal during bearing operation (temperature measurement inside the hole in the bearing journal)

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Fig. 15

The plot of top foil temperature in relation to rotational speed in various bearing locations, during testing of the rotor with two foil bearings

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Fig. 16

The relative vibration amplitude of the foil bearing journals while the rotor is run up to 20,000 rpm

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Fig. 17

The vibration trajectories of the journals for both foil bearings at 10,000 rpm

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Fig. 18

The vibration trajectories of the journals for both foil bearings at 15,000 rpm

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Fig. 19

The vibration trajectories of the journals for both foil bearings at 20,000 rpm

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Fig. 20

The state of polymer coating on the top foil after many hours of experimental studies

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