I need the transfer function of:
$K1*\dot Q(t) + K2*Q(t) + K3*Q(t)^2 + K4 = 0 $
Being K1, K2, K3 and K4 constants that depend on the system parameters. The problem is that it is a nonlinear equation, so I can not apply laplace, I tried a technique of linearization at the point of stability but resulted in 0. Any tips?