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Tikrit Journal of Engineering Sciences (2009) 16(2) 28- 42
Study of a four Titled Pad Bearing
|Ibraheem A. Muhsin|
|Mechanical Eng. Dept., Tikrit University , Iraq|
This research deal with an analytical study of a four titled pad bearing. These pads are arranged around the journal. A computer program has been used to solve Reynolds equation numerically using the finite difference technique. The results showed that, the non dimensional force is increased with the increase of the non dimensional load and the gradient of the curve is increased with the decrease of the ( cd / d ) ratio. while the gradient is decreased with the increase of the number of pads which gives less power absorption due to the decrease of the friction force. Also the results showed that the eccentricity ratio is in the range of (0.4-0.8) and the maximum attitude angle is (43o). The curve of the relation between the eccentricity ratio and the load number does not start from the zero. It has been noticed that the increase of the friction factor cause an increase in Summerfield number and the curve gradient is increase with the decrease of the ( cd / d ) ratio. Also the gradient is increased for a fixed value of the ( d cd / ) ratio with the decrease of external load, where as the decrease of the ( d cd / ) ratio cause a decrease of the oil film thickness and this cause an increase of the shearing rate. Finally, the oil flow rate is increased with the increase of the ( d cd / ) ratio and this would increased more with the increase of the number of pads for the same value of ( d cd / ) ratio which leads to a decrease of the bearing temperature and this maintain the same value of the oil film thickness due to maintaining the same viscosity for the lubricant.
Keywords: Bearing, Lubrication, Non circular bearing