运用建立在包络理论上的重正化群方法,给出了具周期外力Van der Pol方程脉冲型解的一致有效逼近及脉冲型解形成一个脉冲所用的时间.
Using the renormalization group method based on the theory of envelope the authors gave the uniformly valid asymptotic expansion form of the spike solution, on the basis of which the authors also presented the one-cycle time of the spike solution.