Mn. Wang et Zy. Xu, On the homoclinic orbits in a class of two-degree-of-freedom systems underthe resonance conditions, APP MATH ME, 22(3), 2001, pp. 340-352
A class of two-degree-of-freedom systems in resonance with an external, par
ametric excitation is investigated, the existence of the periodic solutions
locked to Omega is proved by the use of the method of multiple scales. Thi
s systems can be transformed into the systems of Wiggins under some conditi
ons. A calculating formula which determines the existence of homoclinic orb
its of the systems is given.