Design of system simulations for effective evaluation of analog test techniques

It is much more effective to evaluate the principles of new test techniques and equipment using standard simulation models designed to reflect measurement noise, permissible parameter variation, non-linear phenomena, and drift, than to attempt demonstrations on randomly available hardware systems. The derivation and exploitation of one such stochastic simulation model of transfer functions representing the field perfornrance of a family of "healthy" electro-hydraulic servo systems is described in the paper. Generalisation of results and current categorisation studies are also outlined.