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DC Field | Value | Language |
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dc.contributor.author | P., Raja | - |
dc.date.accessioned | 2025-07-01T12:56:02Z | - |
dc.date.available | 2025-07-01T12:56:02Z | - |
dc.date.issued | 2013-06 | - |
dc.identifier.uri | http://localhost:8081/jspui/handle/123456789/17509 | - |
dc.description.abstract | Hydrostatic bearings were invented in 1851 by L.D. Girard, who employed high pressure water bearing for a railway propulsion system. From that date, the use of externally pressurized multirecess hydrostatic/hybrid bearing has increased in the number of engineering applications such as machine tools. test equipment, medical equipment, measuring instruments, and radio telescopes and in the aerospace industry owing to their excellent characteristics. Their popularity is attributed to their high load-carrying capacity, zero starting friction and low friction at low speeds, nominally zero wear and hence long life, good rotational accuracy and excellent stiffness and damping. The main problems associated with the circular fluid film journal bearing are poor stability characteristics and self excited vibrations (oil-whirl in-stability). Journal bearings operated at high speeds often exhibit vibrational instability. Circular bearings are known to be prone to vibrations and frequently exhibit a kind of instability known as whirl or whip. Under these circumstances, as well as rotating in the usual manner, the journal begins to wobble or whirl around in the clearance space of the bearing with the centre of the journal at some eccentric distance from the centre of the bearing. If the conditions worsen, the amplitude of whirling becomes large and that may result in the destruction of the shaft and the bearing. i.e. failure-inducing instability. In order to improve the bearing stability, various non circular journal bearing configuration have been developed by researchers to eliminate or control whipping, non circular hydrostatic/hybrid bearings are used. The Noncircular bearings are quite frequently used in high speed machinery as they are efficient and less costly and provide better shaft stability. The Two-lobe bearing (elliptical bearing) are among the commonly used non-circular bearing configuration. A 2-Lobe Six-Pocket hybrid journal bearings have been developed to combine the features of non-circular and circular hybrid journal bearing configurations. In present work a theoretical investigation of a 2-Lobe six-pocket hydrostatic/hybrid journal bearing system have been carried out. The multilobe journal bearing configuration is designed as an arc of the circle with the centre points placed on the symmetry line of the single lobe. The Reynolds equation governing the flow of lubricant in the clearance space between journal and bearing | en_US |
dc.description.sponsorship | INDIAN INSTITUTE OF TECHNOLOGY ROORKEE | en_US |
dc.language.iso | en | en_US |
dc.publisher | I I T ROORKEE | en_US |
dc.subject | Hydrostatic Bearings | en_US |
dc.subject | L.D. Girard | en_US |
dc.subject | Railway Propulsion System | en_US |
dc.subject | Good Rotational Accuracy | en_US |
dc.title | PERFORMANCE OF 2-LOBED HYDROSTATIC/HYBRID JOURNAL BEARING OPERATING IN TURBULENT REGIME | en_US |
dc.type | Other | en_US |
Appears in Collections: | MASTERS' THESES (MIED) |
Files in This Item:
File | Description | Size | Format | |
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G23027.pdf | 11.7 MB | Adobe PDF | View/Open |
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