Open AccessNonlinear dynamics analysis on intermediate bearing-dual rotor system for a marine gas turbine
Author(s) -
Yan Jia,
Yongbao Liu,
Qiang Wang,
Mo Li,
Jun Li
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/510/2/022031
Subject(s) - rotor (electric) , nonlinear system , helicopter rotor , control theory (sociology) , bifurcation diagram , bifurcation , chaotic , bearing (navigation) , equations of motion , dual (grammatical number) , turbine , ordinary differential equation , differential equation , mathematics , computer science , physics , engineering , classical mechanics , mathematical analysis , mechanical engineering , art , control (management) , literature , quantum mechanics , artificial intelligence
In this paper, a marine dual-rotor gas turbine is taken as the research object, and a dual-rotor system model with a simplified structure and supported by intermediary bearings is established based on its structural characteristics and nonlinear characteristics of bearings. The Lagrange equation of motion is used to derive the differential equations of motion of the system, and the fourth-order Runge-Kutta method is used to solve the equations. The nonlinear dynamic response and bifurcation chaotic characteristics of the dual-rotor system with speed changes are studied. The results show that when the speed is low, the system is in a single-cycle motion. As the rotational speed increases, the system exhibits multiplicative bifurcation, Hopf bifurcation and chaotic behaviour. This result provides theoretical guidance for the design and safe and stable operation of the rotor system.