On the number of limit cycles for Bogdanov-Takens system under perturbations of piecewise smooth polynomials

Abstract In this paper, we study the bifurcate of limit cycles for Bogdanov-Takens system(ẋ = y, ẏ = −x + x) under perturbations of piecewise smooth polynomials of degree 2 and n respectively. We bound the number of zeros of first order Melnikov function which controls the number of limit cycles bifurcating from the center. It is proved that the upper bounds of the number of limit cycles with switching curve x = y(m is a positive integral) are (39m+36)n+77m+21(m ≥ 2) and 50n+52(m = 1) (taking into account the multiplicity). The upper bounds number of limit cycles with switching lines x = 0 and y = 0 are 11 (taking into account the multiplicity) and it can be reached.

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