Nonlinear dynamics of rotor bearing systems in automotive turbochargers

Tian, Liang and Wang, Weiji (2013) Nonlinear dynamics of rotor bearing systems in automotive turbochargers. Lambert Academic Publishing, Germany. ISBN 9783659332913

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Owning to the rapid growth of the power of the modern computer, rotordynamic
analysis of TC rotor-bearing systems has nowadays become feasible. The work in this
book is concerned with the nonlinear rotordynamic modelling, simulation and analysis in
the rotor-FRB system of TCs. The conventional linear eigenvalue analysis is shown first in
a gradually deepening manner to provide a deeper insight into the results from nonlinear
simulations and reported experimental results. It is subsequently found that the onset
of first two nonlinear jumps can be effectively predicted by the linearized FRB model,
although the rotordynamic characteristics at higher rotor speeds can hardly be linearly
predicted. The desired oil-film forces for nonlinear simulations are calculated from a
newly proposed analytical method, which is extended from the Capone’s journal bearing
model. Stationary simulations under the perfectly balanced condition show two major subsynchronous components throughout the considered speed range, while the inclusion
of in-phase unbalance places a considerable effect on the rotor response at relatively low
speed and delays the occurrence of oil-film instability. However, at higher rotor speeds, the
lower subsynchronous component can still establish the dominance. The engine induced
vibrations are also considered, and it is seen that the rotor response over the lower end of
the speed range will be considerably affected, whereas, at higher rotor speeds, the engine
induced vibrations can be suppressed by the dominant lower subsynchronous vibrations.
Through carrying out many run-up and run-down simulations, the FRB outer clearance is
found to be a critical parameter of the rotordynamic performance of the investigated TC
rotor-FRB system, since distinct frequency maps are obtained with varying FRB outer
clearances. The nonlinear effects of unbalance are also investigated, and it is observed that
the the rotor response can be considerably affected by the magnitude and distribution of
the imposed unbalance.

Item Type: Book
Schools and Departments: School of Engineering and Informatics > Informatics
Subjects: T Technology > TJ Mechanical engineering and machinery
Depositing User: William Wang
Date Deposited: 02 May 2013 06:55
Last Modified: 02 May 2013 06:55
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