Experimental investigation of the dynamics response of squeeze film dampers made of teflon and carbon/epoxy

In this paper, three damper lengths of 18 mm, 30 mm and 42 mm were examined for two different materials, Teflon and Carbon/epoxy. The Teflon squeeze film dampers (SFD) with three different length-diameter (L/D) ratio were fabricated and tested using turning machine and Carbon/epoxy squeeze film dampers with three different length-diameter (L/D) ratio were fabricated by hand lay-up method. The vibration analysis on these two squeeze film dampers has been carried out. The vibration amplitude, the resonance frequency are measured, and the eccentricity ratio at resonance speed has been determined. Results show that the vibration amplitude of the Carbon/epoxy damper is 31.7%, 33.85%, and 37.25% less at resonance compared with the Teflon damper with (L/D) ratio 0.3, 0.5, and 0.7 respectively. On the other hand, saving weight of 13.33%, 15%, and 26.67% has been achieved by using the Teflon damper with the same (L/D) ratio. A rotor bearing system for vibration analysis has been designed and fabricated. The test rig consists of mild steel shaft with two supports, oil pressure gauge system and two self-alignment ball bearings fixed on each end support. Two squeeze film dampers are used at each of the rotor support ends.