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.
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. Download Citation
Author(s):
M. Kulina, J. Mullen, M. Natesh, H. Saltzman
Affiliated:
Curtiss-Wright Corporation, Wright Aeronautical Division, Wood-Ridge, New Jersey
Pages: 37
Event:
National Aeronautic Meeting and 3rd International Simulation and Training Conference
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Mathematical models
Test facilities
Compressors
Bearings
Parts
Dampers and shock absorbers
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