  Chaos is shown to occur in the flexible shaft rotating-lifting (FSRL) system
of the mono-silicon crystal puller. Chaos is, however, harmful for the quality
of mono-silicon crystal production. Therefore, it should be suppressed. Many
chaos control methods have been proposed theoretically and some have even been
used in applications. For a practical plant displaying harmful chaos, engineers
from a specified area usually face with the challenge to identifying chaos and
to suppressing it by using a proper method. However, despite of the existing
methods, chaos control method selection in the FSRL system is not a trivial
task. For example, for the OGY method, if one cannot find a practical
adjustable parameter, then the OGY method cannot be applied. An impulsive
control method is being proposed which is efficiently able to suppress chaos in
the FSRL system. The selection of the control parameters is obtained by using
the Melnikov method. Simulation results show the correctness of our theoretical
analysis and the effectiveness of the proposed chaos control method.
