Open AccessGeneral Approach to Modeling of Non-Contact Seals and Their Effect on the Dynamics of a Centrifugal Machine Rotor
Author(s) -
С.С. Шевченко
Publication year - 2022
Publication title -
journal of mechanical engineering
Language(s) - English
Resource type - Journals
eISSN - 2709-2992
pISSN - 2709-2984
DOI - 10.15407/pmach2022.01.032
Subject(s) - impulse (physics) , vibration , rotor (electric) , centrifugal pump , control theory (sociology) , computation , helicopter rotor , engineering , rigidity (electromagnetism) , mechanics , rotational speed , amplitude , mechanical engineering , structural engineering , computer science , physics , acoustics , classical mechanics , control (management) , algorithm , quantum mechanics , artificial intelligence , impeller
There is a constant demand for higher equipment parameters, such as pressure of a sealing medium and shaft rotation speed. However, as the parameters rise it becomes more difficult to ensure hermetization efficiency. Moreover, sealing systems affect the overall operational safety of the equipment, especially vibratory. Non-contact seals are considered as hydrostatodynamic supports that can effectively damp rotor oscillations. Models of an impulse and a groove seals, models of rotor-seals system and rotor-auto-unloading system, model of a shaftless pump are studied to evaluate an effect of these sealing systems on oscillatory characteristics of rotor. Analytical dependencies for computation the dynamic characteristics of impulse seals, hydromechanical systems rotor-seals and rotor-auto-unloading, as well as shaftless pumps are obtained. These dependencies describe the radial-angular vibrations of a centrifugal machine rotor in seals-supports. Equations for computation the amplitude-frequency characteristics are given. The directions of improving the оperational safety of critical pumping equipment by purposefully increasing the rigidity of non-contact seals that leads to higher rotor vibration stability have been determined.