회전각가속도가 가스 포일 스러스트 베어링의 마찰 및 마모 특성에 미치는 영향
Effects of Angular Acceleration on the Friction andWear Characteristics of Gas Foil Thrust Bearings
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초록
This paper represents an experimental investigation of the effect of angular acceleration on the friction and wear performances of a gas foil thrust bearing(GFTB). In this study use a typical GFTB with six pads for evaluating the friction and wear performances. The outer radius of the bearing is 31.5 mm, the total bearing area is 2,041 mm2, and the bump foil and incline(ramp) height are the same 500 μm. The newly developed GFTB test rig for measuring friction torque and coefficient measures axial load, drag torque, lift-off speed, and touch-down speed during the test. The experiment conducted for angular accelerations of 78.5, 314.2, and 328.3 rad/s2 at axial loads of 5, 10 and 15 N, respectively. The start-up friction coefficient increases with increasing axial load at the same angular acceleration. The friction coefficient decreases with increasing angular acceleration at the same axial load. As the angular acceleration increased, the lift-off speed at the motor start-up increased, and the touch-down speed at the motor stop decreased. The wear distance of GFTB for 1 on/off cycle increases with increasing axial load at the same angular acceleration, and decreases nonlinearly with increasing angular acceleration at the same axial load. These test results imply that adjusting the rotational angular acceleration helps reduce bearing friction and wear.
Abstract
This paper represents an experimental investigation of the effect of angular acceleration on the friction and wear performances of a gas foil thrust bearing(GFTB). In this study use a typical GFTB with six pads for evaluating the friction and wear performances. The outer radius of the bearing is 31.5 mm, the total bearing area is 2,041 mm2, and the bump foil and incline(ramp) height are the same 500 μm. The newly developed GFTB test rig for measuring friction torque and coefficient measures axial load, drag torque, lift-off speed, and touch-down speed during the test. The experiment conducted for angular accelerations of 78.5, 314.2, and 328.3 rad/s2 at axial loads of 5, 10 and 15 N, respectively. The start-up friction coefficient increases with increasing axial load at the same angular acceleration. The friction coefficient decreases with increasing angular acceleration at the same axial load. As the angular acceleration increased, the lift-off speed at the motor start-up increased, and the touch-down speed at the motor stop decreased. The wear distance of GFTB for 1 on/off cycle increases with increasing axial load at the same angular acceleration, and decreases nonlinearly with increasing angular acceleration at the same axial load. These test results imply that adjusting the rotational angular acceleration helps reduce bearing friction and wear.
참고문헌 (16)
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