Browse Publications Technical Papers 2018-01-1917
2018-10-30

The Fault-Augmented Approach for the Systematic Simulation of Fault Behaviour in Multi-Domain Systems in Aerospace 2018-01-1917

We introduce a fault library developed at ESI ITI for modelling faults in multi-domain physical systems which is based on the simulation of fault effects on the system’s behaviour. We outline the motivation of how and why to model faults and their combination systematically as well as a description of the Modelica-based library structure with a wizard supporting the semi-automatic augmentation process of faults. The fault types are classified into continuous and discrete with dedicated type definitions, such as intensity, activity, scalability, functional dependency, etc. The application of the fault library is exemplified in the field of hydraulic systems in aerospace. A hydraulic rudder control system is modelled and analysed with the fault augmented components. The rudder is controlled by two hydraulic actuators with independent power sources. The rudder drives are equipped with hydromechanical, electrical and digital systems for parrying failures, which should be tested at an early stage of design. To perform the tests, a multi-domain dynamic system model was created, wherein failures are systematically simulated using a special classification approach for faults. In addition, we demonstrate several complementary tests obtained by a variants simulation and analyse the results of simulations of the fault augmented model using supervised machine learning algorithms. The model output data are prepared for the fault analysis by using a helper library extracting the features (mean, max, fft, etc.) robustly. The future extraction acts as an intermediate step to calculate performance indicators excluding all possible uncertainties because of the numerical integration. The additional library of performance indicators has been developed to systematically check which faults or their combination lead to violation of pre-defined criteria and requirements.

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