WSEAS Transactions on Applied and Theoretical Mechanics
Print ISSN: 1991-8747, E-ISSN: 2224-3429
Volume 11, 2016
Experimental Study on Vibrations of Shafts Suspended by Regular and Irregular Bore Journal Bearing
Authors: ,
Abstract: Practical applications of machine elements supported by a flexible support are rotating shafts mounted on bearings. The bearings in general are journal or rolling which have stiffness and damping characteristics. The shaft itself has hysteric damping due to the deflection and whirling. The problem of journal bearing vibrations is a great importance in whirling of the rotating shafts and it is important to minimize the vibrations acting on that bearings. A very recent method for doing this is the creation of smart journal bearings using irregular surface. This type of surfaces will cause an alteration in the dynamic properties of the journal bearing and thus the dynamic performance of the rotating shaft. This paper introduces an experimental model of whirling flexible shaft carrying a load at a mid-point and is supported by two identical journal bearings at its ends. Two types of journal bearings are fabricated, the first one its bore was made from regular surface and the second its bore was made from irregular surface. The analysis here is based on measuring the vibrations in the presence of regular and irregular bore journal bearing. Hammering and run - up test was made and analyzed for the two cases. Also effect of changing speed and load acting on each bearing was studied experimentally. An overall vibration is measured for different loads and the results were compared as the shaft is mounted by regular bore bearing or irregular type.
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Pages: 8-21
WSEAS Transactions on Applied and Theoretical Mechanics, ISSN / E-ISSN: 1991-8747 / 2224-3429, Volume 11, 2016, Art. #2