Abstract
Squeeze film dampers (SFD) are used to reduce dynamical loads in rotating machinery or to improve their performances in numerous industrial applications. The present paper considers the response of a dual shaft system with a SFD mounted on one of its bearings. The study is concerned with the overall system’s dynamics in presence of a sealed SFD bearing with a lateral feeding groove and more specifically with the characterization of such damper in operational conditions. The design characteristics of the SFD are based on the linear approximation and the optimization w.r.t. sensitivity of appropriate eigenmodes of a numerical model of the dual shaft test rig. In order to gain more insight into the SFD operation, the experimental kinematic and pressure measurements data are processed within a numerical model of the fluid film using the short bearing approximation of the Reynolds equation and taking into account the flow into the groove. The work holds for low Reynolds number and completely sealed SFD were vapour cavitation is completely absent.
Highlights
The dynamic behavior of the dual-rotor system in each one of its different configurations is characterized by means of its unbalanced responses for known unbalance mass added to the disks
Considering the Cvt’s, the identified numerical values for these damping factors are on the order of 77 000 Nm.s−1 for the 1st critical speed and of 113 000 Nm.s−1 for the 4th one and should be compared to those found in the overall dynamic study which are respectively 60 000 Nm.s−1 and 90 000 Nm.s−1
Numerical and experimental studies of a Squeeze film dampers (SFD) mounted on a dual shaft test rig have allowed to validate a Reynolds-based model of the SFD flow with the feeding groove contribution taken into account
Summary
Of the SFD bearings mechanical impedance to the global vibration response of the dynamical system. Some turbomachinery equipments are characterized by a high pressure variation, which justifies the use of several spools, each having its rotor spinning at the optimal rate. Some of them have an intershaft bearings in order to reduce the stator weight. This design solution leads to a dynamic coupling of the spools so that the unbalance of each rotor involves a global response of the structure. In 2007, Gupta et al [8] presented a numerical and experimental study of a small-scale dual-shaft test bench with an inter-shaft SFD. It has been observed that an optimal value of clearance can be determined in order to suppress a given eigenmode of the structure. In 2009, Delgado et al [9] have studied the characteristics of a SFD test rig undergoing multi-frequency, non-circular motions
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