While aircraft fuel systems are not regarded as one of the complex features of an aircraft, they are essential systems of all aircraft. Their role and functional characteristics play a critical aspect in the design, certification, operation of both military and commercial planes. Engine fuel consumption varies according to the aircraft mission. In this paper, a typical aircraft fuel system configuration is discussed and fuel transfer analysis i.e. simulation of aircraft fuel system performed on MSC EASY5 platform is presented. The results are verified by comparing with the engine requirements Keywords-aircraft fuel system, fuel transfer, simulation, Easy5.
This paper deals with the experimental verification of friction models used in the estimation of frictional forces in a hydraulic actuator. The friction force is calculated with the measured readings of pressure in the cylinder chambers and the acceleration of the piston. In order to predict friction forces in the hydraulic actuator, mathematical models, namely LuGre model and modified LuGre model, are extensively used. These models are simulated to predict the friction forces in the test actuator. The physical test setup and the simulation models are commanded with identical velocity inputs, and the results in each test case are compared. The experiment results show that the modified LuGre model with dimensionless fluid film thickness parameter predicts the friction forces in hydraulic actuator with a good accuracy when compared with the other models.
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