Abstract
In the present paper, we investigate a class of nonlinear oscillation equations in electrical engineering by using the modified Krylov-Bogolyubov method presented in[1]. We obtain quantitatively the parameter range for the existence of a limit cycle and the amplitude of the limit cycle, and find that the limit cycle is unstable. All the results agree entirely with the known results given by qualitative analysis, and hence confirm the effectiveness of the above-mentioned asymptotic method.
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