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STUDY ON DYNAMICS AND FAULT CHARACTERISTICS OF TWO-SPAN ROTOR-BEARING SYSTEM WITH PEDESTAL LOOSENESS

Luo Yue

Open publisher page 4 citations

Abstract

A non-linear dynamic model was established of a two-span elastic rotor-bearing system with pedestal looseness fault supported on three plain journal bearings. The complex motion characteristics of the rotor-bearing system were numerically studied, and the influences of the looseness mass to the nonlinear characteristics were analyzed. The results indicate there are marked influences of the looseness mass to the characteristics of the system in high rotate speed region, especially the chaos and period-3 motions. Peculiar trajectories of loosened journal center slightly shaking pedestal is found. A theoretic reference is provided to diagnose the fault of pedestal looseness in the rotor-bearing system effectively.

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What this paper is about

A non-linear dynamic model was established of a two-span elastic rotor-bearing system with pedestal looseness fault supported on three plain journal bearings. The complex motion characteristics of the rotor-bearing system were numerically studied, and the influences of the looseness mass to the nonlinear characteristics were analyzed. The results indicate there are marked influences of the looseness mass to the characteristics of the system in high rotate speed region, especially the chaos and period-3 motions. Peculiar trajectories of loosened journal center slightly shaking pedestal is found. A theoretic reference is provided to diagnose the fault of pedestal looseness in the rotor-bearing system effectively.

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Available abstract

A non-linear dynamic model was established of a two-span elastic rotor-bearing system with pedestal looseness fault supported on three plain journal bearings. The complex motion characteristics of the rotor-bearing system were numerically studied, and the influences of the looseness mass to the nonlinear characteristics were analyzed. The results indicate there are marked influences of the looseness mass to the characteristics of the system in high rotate speed region, especially the chaos and period-3 motions. Peculiar trajectories of loosened journal center slightly shaking pedestal is found. A theoretic reference is provided to diagnose the fault of pedestal looseness in the rotor-bearing system effectively.

Key concepts: Pedestal, Bearing (navigation), Rotor (electric), Span (engineering), Fault (geology), Helicopter rotor, Structural engineering, Nonlinear system

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