In this paper, the stability and bifurcation of an airfoil model with a high-order nonlinear
spring are investigated both analytically and numerically. Two possible types of bifurcation
at the equilibrium point are studied. It is proved that the zero characteristic root can only
be a single zero. With the help of the center manifold theory and the normal form theory,
the expressions of critical bifurcation curves leading to initial bifurcation and secondary
bifurcation are obtained. Numerical simulations confirm the theoretical results.
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