Stabilization of fluid servomechanisms by the stability factor method

SURVEYING THE MANY tools of the trade for servomechanism analysis, it is obvious, as in reference 1, that graphical and graphical-numerical methods predominate, while algebraic methods ¿ methods which follow the problem from start to finish in algebraic form ¿ are notable by their absence. The stability factor method is one which fills this vacancy. At least in the case of typical fluid servomechanisms, it yields simple, general, and previously unrecognized equations for both analysis and synthesis, rendering graphical analysis frequently unnecessary.