Study of Tilting Pad Journal Bearings to avoid Pad Flutter

This paper studies the static and dynamic function of tilting pad journal bearings under low load situation, centering on addressing pad fluttering observed in some types of bearings. The report showed the occurrence of pad fluttering, prompting exploration of three potential methods. One method includes introducing pad before load through the installation of shims, while another considered adding pad stops or springs, although these options increased the intricacy of the bearing assembly.

Finally, the most useful solution is to machine a taper or relief at the leading edge of each pad emerged. The specific dimension of this relief was regarded as a vital design factor, including its depth and angular extent, To increase the relief's angular extent and depth, it should enhance oil flow rates, thereby lower bearing working temperatures. Moreover, this modification improved the direct stiffness of the bearing.

Dut to these findings, adjustment were made to lead reduction in bearing operating temperatures and wear. During operation, pad fluttering was observed in one of the bearings examined, suspected to be an important cause of reducing bearing temperatures. The relief machining at both leading and trailing edges of the pads, it was regarded as essential for ensure a merging wedge formation at the leading edge, effectively preventing pad fluttering and enhancing bearing performance.