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This paper describes the application of a rule-based expert system shell to the condition monitoring of a solenoid valve/motor speed control system. The expert system is used to determine drift of transducer outputs and the actual faults within the hydraulic system. It compares the transducer values with each other to determine whether or not there is conformity within the system. All transducers are checked for drift and complete failure and the system is monitored for all external leakages, cross port leakage and combinations of such leakages. The output is then produced on a clear graphics display.

A new approach to systems dynamic analysis is presented utilising a simulation package modified for the CAD of hydraulic circuits. The graphics capability of the latest PC's is utilised to give a realistic representation of the actual hydraulic circuit diagram using appropriate component icons. This is then used to simulate the behaviour of an industrial forging press circuit with both position feedback of the control valve and the main cylinder. The CAD package is used to compare the simulation and experimental results and to determine the effect of a flow bypass approach on the dynamic behaviour.