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http://dx.doi.org/10.9725/kstle.2017.33.6.309

Dynamic Characteristics of Externally Pressurized Air Pad Bearings with Closed Loop Grooves  

Park, Gwang Won (SL Chassis Engineering 1 Team)
Park, Sang-Shin (School of Mechanical Engineering, Yeungnam University)
Publication Information
Tribology and Lubricants / v.33, no.6, 2017 , pp. 309-314 More about this Journal
Abstract
This paper presents a theoretical investigation of the dynamic characteristics of externally pressurized air pad bearings with closed loop grooves. These grooves are made on the surface of bearings to reduce the number of supply holes so that manufacturing costs can be reduced. The semi-implicit method is applied to calculate the time varying pressure profile on the air bearing surface owing to the advantages of numerical stability and fast time tracing characteristics. The static pressure of the groove bearings is much higher than that without grooves, so the groove bearings can provide high load carrying capacity. The equation of motion considering vertical motion and tilting motion are also solved using the Runge-Kutta 4th order method. By combining the semi-implicit method and the Runge-Kutta method, fast calculations of the dynamic behavior of the air bearing can be achieved. The variations of bearing reaction force, air film reaction moment, height, and tilting angle are investigated for the step force input, which is 20% higher than the bearing reaction, when the nominal clearance is 6 mm. The effect of the groove width and the groove depth are investigated by calculating the dynamic behavior. The possibility of the air hammering with the depth of the groove is found and discussed.
Keywords
externally pressurized air pad bearing; bearing instability; surface groove; dynamic analysis; semi-implicit method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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