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Experimental Evaluation of Hydrodyna...

Lutfullaeva, Anbara S.,

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Experimental Evaluation of Hydrodynamic Fixed Geometry Thrust Bearing Under Dynamic Load /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Experimental Evaluation of Hydrodynamic Fixed Geometry Thrust Bearing Under Dynamic Load // Anbara S Lutfullaeva.
Author:	Lutfullaeva, Anbara S.,
Description:	1 electronic resource (154 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31358090
ISBN:	9798382780108

Experimental Evaluation of Hydrodynamic Fixed Geometry Thrust Bearing Under Dynamic Load /
Lutfullaeva, Anbara S.,

Experimental Evaluation of Hydrodynamic Fixed Geometry Thrust Bearing Under Dynamic Load /Anbara S Lutfullaeva. - 1 electronic resource (154 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

Hydrodynamic thrust bearings are extensively used in rotary machines. It is well known that different environmental conditions can strongly affect these machines and their rotating parts. Since the conditions can be static or dynamic, it is essential to identify the true operating conditions and its effect on the hydrodynamic thrust bearings for proper design. Oil film pressure, oil film thickness and temperature of oil are some of the most crucial operating parameters. Measuring the oil film pressure especially has been a very demanding task that many researchers have studied by mathematical means. In the present dissertation, tapered land hydrodynamic thrust bearing is experimentally investigated to understand its behavior under dynamic loading. To the best of the author's knowledge, published work on experimental testing of hydrodynamic fixed geometry thrust bearings under dynamic conditions for varying frequencies is non-existent.This dissertation is based on an experimental test rig that is designed, machined, and fabricated to apply and study dynamic loading conditions on hydrodynamic thrust bearings. The rig has the capability for measuring the oil film pressure, oil film thickness and the temperature of the oil. A HAAS-VF1 machine has been re-utilized as a housing for the dynamic test rig and a customized hydraulic loading system was used. Sinusoidal waves with varying frequencies (2-10 Hz), peak loads (150-350 lbs), and runner speed (1500 RPM and 2000 RPM) were applied to a thrust bearing of 0.002 in. taper depth. Each experimental test has been validated by pressure trends of leading, middle, and trailing edges of the pads of the bearing by comparing with static test rig results.In one of the presented cases, the 150 lbs peak load test at 1500 RPM showed a reduction of about 59.4%, 74.6%, and 57% in leading, middle, and trailing pressures, respectively, as the load frequency increased from 2 Hz to 10 Hz. Additionally, with the rise in dynamic loading frequency, there was an upward trend in the minimum oil film thickness. Specifically, there was an increase of 71.3%, 72.5%, and 67.8% in oil film thickness for peak load tests at 150 lbs, 250 lbs, and 350 lbs, respectively, at 1500 RPM between the 2 Hz and 10 Hz loading frequencies. These discoveries offer valuable perspectives on the performance attributes of hydrodynamic thrust bearings under dynamic loads, potentially aiding in the design and application considerations for such bearings.

English

ISBN: 9798382780108Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Hydrodynamic thrust bearings

Experimental Evaluation of Hydrodynamic Fixed Geometry Thrust Bearing Under Dynamic Load /
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520 $a Hydrodynamic thrust bearings are extensively used in rotary machines. It is well known that different environmental conditions can strongly affect these machines and their rotating parts. Since the conditions can be static or dynamic, it is essential to identify the true operating conditions and its effect on the hydrodynamic thrust bearings for proper design. Oil film pressure, oil film thickness and temperature of oil are some of the most crucial operating parameters. Measuring the oil film pressure especially has been a very demanding task that many researchers have studied by mathematical means. In the present dissertation, tapered land hydrodynamic thrust bearing is experimentally investigated to understand its behavior under dynamic loading. To the best of the author's knowledge, published work on experimental testing of hydrodynamic fixed geometry thrust bearings under dynamic conditions for varying frequencies is non-existent.This dissertation is based on an experimental test rig that is designed, machined, and fabricated to apply and study dynamic loading conditions on hydrodynamic thrust bearings. The rig has the capability for measuring the oil film pressure, oil film thickness and the temperature of the oil. A HAAS-VF1 machine has been re-utilized as a housing for the dynamic test rig and a customized hydraulic loading system was used. Sinusoidal waves with varying frequencies (2-10 Hz), peak loads (150-350 lbs), and runner speed (1500 RPM and 2000 RPM) were applied to a thrust bearing of 0.002 in. taper depth. Each experimental test has been validated by pressure trends of leading, middle, and trailing edges of the pads of the bearing by comparing with static test rig results.In one of the presented cases, the 150 lbs peak load test at 1500 RPM showed a reduction of about 59.4%, 74.6%, and 57% in leading, middle, and trailing pressures, respectively, as the load frequency increased from 2 Hz to 10 Hz. Additionally, with the rise in dynamic loading frequency, there was an upward trend in the minimum oil film thickness. Specifically, there was an increase of 71.3%, 72.5%, and 67.8% in oil film thickness for peak load tests at 150 lbs, 250 lbs, and 350 lbs, respectively, at 1500 RPM between the 2 Hz and 10 Hz loading frequencies. These discoveries offer valuable perspectives on the performance attributes of hydrodynamic thrust bearings under dynamic loads, potentially aiding in the design and application considerations for such bearings.
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650 4 $a Mechanics. $3 525881
653 $a Hydrodynamic thrust bearings
653 $a Test rig
653 $a Dynamic loading conditions
653 $a Vibration
653 $a Load frequency
690 $a 0548
690 $a 0543
690 $a 0346
710 2 $a Ohio University. $b Mechanical and Systems Engineering (Engineering and Technology). $e degree granting institution. $3 3821628
720 1 $a Ali, Muhammad $e degree supervisor.
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790 $a 0167
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