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Experimental and theoretical investigations of the lateral vibrations of an unbalanced Jeffcott rotor

Frontiers of Structural and Civil Engineering 2020年第4期14卷 1024-1032页

作者： Ali ALSALEH Hamid MSEDIGHI Hassen MOUAKAD Saudi Arabian Oil Company(ARAMCO) Dhahran 31311Saudi Arabia Mechanical Engineering Deparment Faculty of EngineeringShahid Chamran University of AhvazAhvaz 61357-43337Iran Drilling Center of Excellence and Research Shahid Chamran University of AhvazAhvaz 61357-43337Iran Mechanical and Industrial Engineering Deparment Sultan Qaboos UniversinAI Khoudh MuscatOman

The current work experimentally explores and then theoretically examines the lateral vibrations of an unbalanced Jeffcott rotor-system working at several unbalance *** this end,three conditions of eccentric masses are considered by using a Bently Nevada RK-4 rotor *** of the steady-state as well as the startup data at rigid and flexible rotor states are captured by conducting a setup that mimics the vibration monitoring industrial *** linear governing equation of the considered rotor is extracted by adopting the Lagrange method on the basis of rigid rotor assumptions to theoretically predict the lateral *** dynamic features of the rotor system such as the linearized bearing induced stiffness are exclusively acquired from startup *** is demonstrated that,with an error of less than 5%,the proposed two-degrees-of-freedom model can predict the flexural vibrations at rigid *** at flexible condition,it fails to accurately predict the dynamic *** contrast to the other works where nonlinear mathematical models with some complexities are proposed to mathematically model the real systems,the present study illustrates the applicability of employing simple models to predict the dynamic response of a real rotor-system with an acceptable accuracy.

关键词： rotor-dynamics Jeffcott rotor lateral vibrations Lagrange method system-equivalent stfess sleeve bearings il film induced stiffness

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