Palavra-chave: LIMIT CYCLE

AVERAGING METHOD INTEGRABLE SYSTEMS SISTEMAS DINÂMICOS PENDULUM BROWER THEORY EQUILIBRIUM LIENARD EQUATION POLICYCLE BIFURCATION BIFURCATIONS LIAPOUNOV-SCHIMIDT REDUCTION ISOCHRONOUS CENTER SINGULARIDADE SINGULARITY INVARIANT TORUS NONSMOOTH DYNAMICAL SYSTEMS INVARIANT VARIETY NON-SMOOTH VECTOR FIELDS HAMILTONIAN REGULARIZATION DULAC PROBLEM MINIMAL SET AVERAGE PIECEWISE SMOOTH SYSTEMS ATTRACTOR SYNCHRONIZATION PERIODIC ORBIT ASYMPTOTIC STABILITY LINEAR VECTOR FIELD ESTABILIDADE ESTRUTURAL CENTER AVERAGING