New Treatment on Bifurcations of Periodic Solutions and Homoclinic Orbits at High r in the Lorenz Equations

In this paper, the existence of periodic solutions and homoclinic orbits in the Lorenz equations with high r is rigorously proved. The paper deals with the Lorenz model as a three-dimensional perturbed Hamiltonian system generated by the three-dimensional Lie algebra. By using the method of Melnikov vector,the explicit parametric conditions can be determined.