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This paper develops fast reduced-order models for generic aircraft electromechanical actuators (EMA). The models derivation is described in detail. It is shown that constant power load representation has its own dynamics that depend both on the principal machine parameters and upon the pulse-width modulation algorithm used. The accuracy specification cannot be met unless these dynamics are considered. The mechanism to take these dynamics into account by reduced-order models is proposed. Simulation results demonstrate the accuracy within the specified frequency bandwidth and the significant improvement in the computational time. The reported models can be used in a wide range of aircraft power system simulations.

An electric chassis dynamometer or ‘rolling road’ used in the development of new motor vehicles is required to simulate the effect of motoring on a road during the road load simulation (RLS) mode of operation. The type of rolling road considered in this paper contains an individually controlled machine and roll for each wheel of the vehicle. A strategy for the control of a multi-roll chassis dynamometer in RLS mode is presented which uses tractive force ‘observations’ of each of the vehicle wheels to provide the correct vehicle loading.