Stability contours for the analysis of analog/digital hybrid simulation loops

The use of hybrid computers for the simulation of dynamic systems has focused interest on the ill-effects of sampling and digital execution time upon solution accuracy. Techniques have been proposed for the compensation of these effects by various authors. However, there has been a noted lack of common denominator available to compare the relative merits of these methods of compensation. As a rule, one may observe that quality criteria used to evaluate different compensation methods have been local rather than global, and the resulting compensation algorithms are therefore largely tuned to whatever quality criteria has been selected a priori.