In this paper, the stability behavior of an axially moving string is e
xamined in the presence of parametric and combination resonances. The
Galerkin discretization utilizing stationary string eigenfunctions is
used to transform the partial differential equation governing transver
se response into a set of coupled ordinary differential equations. Ham
iltonian formulation and averaging method are used to yield a set of a
utonomous equations. The conditions of parametric and summed resonance
s are obtained over specific ranges between the natural and exciting f
requencies. Explicit results of the stability boundaries for the first
and secondary principal parametric and the first summation resonances
and the bifurcation paths of the nontrivial amplitudes are obtained.
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