Control of Rotor Vibrations Using Hybrid Squeeze Film Dampers

This report covers the development of the Hybrid Squeeze Film Damper HSFD for use as an active control device for controlling rotor vibrations. In particular, the work done included the automation and design of the HSFD, the elaborate modeling of the HSFD, the development of the control algorithms, and finally the experimental verification of the performance and control of the HSFD. This extensive research project confirmed the capabilities of the HSFD as an efficient and powerful controlling element for high speed rotors, particularly of aircraft engines and rocket turbopumps. Specifically, the results of this research project establish that the HSFD 1 improves the vibration isolation capability of the rotor support, 2 reduces the amplitude of vibration of the rotor at all speeds, and 3 results in a rotating machine that is capable of operating under varying and adverse conditions. It is the opinion of the research team that the HSFD is now ready for engine testing. The device is reliable, the control algorithms are sufficiently developed, the laboratory experimentation and verification were extensive and illustrate the strengths and adaptability of HSFDs. It is thus appropriate to expect that this work should lead to full-scale engine testing of the active control of rotor vibrations using HSFDs.