Direct calculation by analogue computer of sensitivity coefficients of linear and nonlinear systems

This letter gives a method which enables a direct analysis of sensitivity to parameter variations of linear or nonlinear systems to be simulated on an analogue computer. Based on the automatic changes ± ¿q of a parameter q around a value q0, this method enables the dynamic sensitivity coefficient u(t, q0) to be computed with respect to this parameter by comparison of the disturbed solutions obtained in such a way.