열린 끝단과 중앙 홈을 갖는 스퀴즈 필름 댐퍼의 감쇠 특성에 대한 실험적 규명
Experimental Identification of the Damping Characteristics ofa Squeeze Film Damper with Open Ends and Central Groove
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
This paper presents the development of a squeeze film damper (SFD) test rig and experimental identification of the effects of clearance, damper length, journal eccentricity ratio, excitation amplitude, oil supply pressure, and oil flow rate on the damping coefficients of a test SFD with open ends and a central groove. Test data are compared with predictions from a simple model developed for short SFDs with open ends and a central groove. The test results show a significant decrease in the damping coefficient with increasing clearance and a dramatic increase with damper length, which are in good agreement with the simple model predictions. According to the simple model, the damping coefficient is inversely proportional to the cube of the clearance and directly proportional to the cube of the length. An increase in the journal eccentricity ratio results in a dramatic increase in the damping coefficient by as much as 15 times that of the concentric case, particularly at low excitation frequencies. By contrast, the measured damping coefficient remains almost constant with changes in the excitation amplitude and supply pressure, which are not major factors in the damper design. In general, the test data agree well with the simple model predictions, excluding cases that show increases in the SFD length and journal eccentricity, which indicate significant dependency on the excitation frequency
Abstract
This paper presents the development of a squeeze film damper (SFD) test rig and experimental identification of the effects of clearance, damper length, journal eccentricity ratio, excitation amplitude, oil supply pressure, and oil flow rate on the damping coefficients of a test SFD with open ends and a central groove. Test data are compared with predictions from a simple model developed for short SFDs with open ends and a central groove. The test results show a significant decrease in the damping coefficient with increasing clearance and a dramatic increase with damper length, which are in good agreement with the simple model predictions. According to the simple model, the damping coefficient is inversely proportional to the cube of the clearance and directly proportional to the cube of the length. An increase in the journal eccentricity ratio results in a dramatic increase in the damping coefficient by as much as 15 times that of the concentric case, particularly at low excitation frequencies. By contrast, the measured damping coefficient remains almost constant with changes in the excitation amplitude and supply pressure, which are not major factors in the damper design. In general, the test data agree well with the simple model predictions, excluding cases that show increases in the SFD length and journal eccentricity, which indicate significant dependency on the excitation frequency
참고문헌 (10)
- Yi, H., "Recent Advances in Fluid Film Bearings and Dampers for Turbomachinery", Tribol. Lubr, 36(4), pp.215~231 (2020)[DOI]
- San Andrés, L., "Effect of Fluid Inertia on Squeeze-Film Damper Forces for Small-Amplitude Circular-Centered Motions", Tribol. Trans, 30(1), pp.63~68 (1987)
- Walton, J. F., "Experimental Observation of Cavitating Squeeze-Film Dampers", J. Tribol, 109(2), pp.290~294 (1987)
- Arauz, G. L., "Effect of a Circumferential Feeding Groove on the Dynamic Force Response of a Short Squeeze Film Damper", J. Tribol, 116(2), pp.369~376 (1994)
- Jeung, S. H., "Performance of an Open Ends Squeeze Film Damper Operating with Large Amplitude Orbital Motions: Experimental Analysis and Assessment of the Accuracy of the Linearized Force Coefficients Model", Doctor, Division of Mechanical Engineering, pp.2013
- San Andrés, L., "Force Coefficients for a Large Clearance Open Ends Squeeze Film Damper with a Central Feed Groove : Experiments and Predictions", Tribol. Int, 71, pp.17~25 (2014)
- Zhang, J. X., "Force coefficients for a centrally grooved short squeeze film damper", J. Tribol, 118(3), pp.608~616 (1996)
- San Andrés, L. A, "Analysis of short squeeze film dampers with a central groove", J. Tribol, 114(4), pp.659~664 (1992)
- Analysis of high load dampers, "Bhat, S. T.", NASA, ~, pp.CR-165503 (1981)
- Arauz, G. L., "Experimental study on the effect of a circumferential feeding groove on the dynamic force response of a sealed squeeze film damper", J. Tribol, 118(4), pp.900~905 (1996)