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A New Concept for Critical Speed Control
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English
Abstract
This paper describes a device for the control of critical speeds consisting basically of a squeeze film oil damper between two non-rotating parts in parallel with a flexible bearing support. A mathematical model of the vibratory system is developed showing the existence of two different critical speeds as a function of damping. From the model, response of the system is predicted. A critical speed test rig was designed and fabricated and a test program was conducted. Results of the experimental investigation confirm the applicability of the model and the use of the device as a critical speed control. Further testing is reported on the effect of various design parameters on damping, and a simple method of varying the damping on the test stand during engine operation is shown. The results of the investigation were applied to the design of a similar device for a multistage compressor which was successfully operated with low amplitude throughout the speed range. Disassembly following 150 hours of compressor testing showed all parts to be in excellent condition.
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Authors
- M. Kulina - Curtiss-Wright Corporation, Wright Aeronautical Division, Wood-Ridge, New Jersey
- J. Mullen - Curtiss-Wright Corporation, Wright Aeronautical Division, Wood-Ridge, New Jersey
- M. Natesh - Curtiss-Wright Corporation, Wright Aeronautical Division, Wood-Ridge, New Jersey
- H. Saltzman - Curtiss-Wright Corporation, Wright Aeronautical Division, Wood-Ridge, New Jersey
Citation
Kulina, M., Mullen, J., Natesh, M., and Saltzman, H., "A New Concept for Critical Speed Control," SAE Technical Paper 670347, 1967, https://doi.org/10.4271/670347.Also In
References
- Gunter E. Jr. “Dynamic Stability of Rotor Bearing Systems.” 1966
- Dimentberg F. “Flexural Vibration of Rotating Shafts.” Butterworths London 1961
- Hamburg G. Parkinson J. “Gas Turbine Shaft Dynamics.” 1961 Paper No. 382B
- Cooper S. “Preliminary Investigation of Oil Film for Control of Vibration.” 1963
- February 6 1967 39
- Den Hartog J. P. “Mechanical Vibrations.” McGraw Hill New York, N.Y. 1956 297ff
- Prohl M. A. “A General Method for Calculating Critical Speeds of Flexible Rotors.” ASME Annual Meeting New York November 27–December 1, 1944
- Grassam N. S. Powell J. W. “Gas Lubricated Bearings.” Butterworths London 1964
- Myklestad N. O. “Fundamentals of Vibration Analysis.” McGraw Hill New York, N.Y. 1956