Leung, Andrew Yee TakAndrew Yee TakLeungZhang, Q.Chen, Y.2022-05-202022-05-201994https://repository.sfu.edu.hk/handle/sfu/3225A method is proposed for calculating the normal form coefficients of the degenerate Hopf bifurcation system and the steady periodic solutions of a nonlinear vibration system. The results obtained by this method are the same as those obtained by the classical one. The present method is much simpler and can easily be implemented: that is, given the coefficients of the governing equations, the response is obtained directly by substitution.enjournal article10.3233/SAV-1994-1303