Showing papers by "Itzhak Green published in 1995"
TL;DR: In this paper, the authors describe the design and construction of a non-contacting flexibly mounted rotor (FMR) test rig and compare its experimental results with theoretical results with theory.
Abstract: The dynamic behaviour of mechanical face seal has been an active area of research for the past three decades. Analytical and experimental work was exclusively devoted to the flexibly mounted stator seal (FMS). Recent theoretical work on the dynamics of the noncontacting flexibly mounted rotor (FMR) seal proved that it is superior in every aspect of dynamic behaviour compared to the FMS seal. The FMR seal is inherently stable regardless of operating speed, the maximum relative misalignment is smaller, and the critical stator misalignment is larger. These are measures of superior performance. Yet, no experimental investigation of the noncontacting FMR seals has been reported. This work describes the design and construction of a noncontacting FMR mechanical face seal test rig. Features of the rig design and data analysis will be introduced. Finally, experimental results will be compared with theory.
21 citations
TL;DR: In this paper, the steady state response of a non-contacting flexibly mounted rotor (FMR) seal was measured at various operating conditions and the results were given in terms of dynamic and static transmissibilities, i.e., amplitude ratio of responses to two forcing inputs.
Abstract: Recent theoretical work on the dynamics of the noncontacting flexibly mounted rotor (FMR) seal has shown that it is superior in every aspect of dynamic behavior compared to the flexibly mounted stator (FMS) seal. The FMR seal is inherently stable regardless of the operating speed, the maximum relative misalignment response is smaller, and the critical stator misalignment is larger. All these are measures of superior performance. This work undertakes the experimental investigation of the dynamic behavior of a noncontacting FMR seal. The steady-state response of the FMR seal was measured at various operating conditions. The results are given in terms of dynamic and static transmissibilities, i.e., amplitude ratio of responses to two forcing inputs: the initial rotor and fixed stator misalignments. These are then compared to the analytical predictions. Further, operation maps are drawnfor each set of operation conditions. The maps indicate how safely (away from contact) the seal operates. It is shown that the combination of the seal parameters that maximize the fluid film stiffness is optimal for safe noncontacting operation
20 citations